Belt Drive Preventive Maintenance &

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TABLE OF CONTENTS
Safety Policy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Sources of Drive Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Preventive Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Drive Shutdown & Thorough Inspection
Simple Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Preventive Maintenance Checklist . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Preventive Maintenance Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Measuring Belt Tension . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Belt Storage & Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Belt Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Belt Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Belt Styles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Static Conductive Belts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Belt Drive Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Noise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Sprocket Corrosion Prevention . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Troubleshooting Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Problem/Solution Summary Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Maintenance Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Technical Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
NEMA Minimum Diameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Minimum Recommended Diameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Installation & Tensioning Allowances . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Idler Hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Drive Survey Worksheet
High Speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Low Speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Design IQ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Trademarks & Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
© 2015 Gates Corporation
Denver, Colorado 80202
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SAFETY POLICY
Warning! Be Safe! Gates belt drive systems are very reliable when used safely and
within Gates application recommendations. However, there are specific USES THAT
MUST BE AVOIDED due to the risk of serious injury or death. These prohibited misuses
include:
Primary In-Flight Aircraft Systems
Do not use Gates belts, pulleys or sprockets on aircraft, propeller or rotor drive systems
or in-flight accessory drives. Gates belt drive systems are not intended for aircraft use.
Lift Systems
Do not use Gates belts, pulleys or sprockets in applications that depend solely upon
the belt to raise/lower, support or sustain a mass without an independent safety
backup system. For applications requiring special “Lift” or “Proof” type chains with
minimum tensile strength or certified/test tensile strength requirements, be advised
that because Gates belts have different drive design procedures from metal chains,
the tensile strength of a belt when compared to the tensile strength of a chain should
only be a part of the design process. Diligent analysis with the customer’s participation
should be sued when considering any such application.
Braking Systems
Do not use Gates belts, pulleys or sprockets in applications that depend solely upon the
belt to slow or stop a mass, or to act as a brake without an independent safety backup
system. Gates belt drive systems are not intended to function as a braking device in
“emergency stop” systems.
DRIVE DESIGN SOFTWARE
Drive design software can be found at
www.gates.com/drivedesign.
This software assists designers in quickly
selecting optimum drive solutions.
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SOURCES OF DRIVE PROBLEMS
Poor Drive Design
Improper Belt or
Pulley Installation
Improper Belt
Storage or Handling
Environmental
Factors
Defective Drive
Components
Improper Drive
Maintenance
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PREVENTIVE MAINTENANCE
Why have a preventive maintenance program?
When compared to the constant lubrication problems
associated with chain drives, or the mechanical
problems and high costs associated with gear drives,
belts are the most cost-effective, reliable means of
power transmission.
However, optimum belt drive performance requires
proper maintenance. The potential for long service life is
built into every Gates belt. When coupled with a regularly
scheduled maintenance program, belt drives will run
relatively trouble-free for a long time.
Belt drive should have adequate guard
Carefully inspect all belts
Power should be shut off and controls locked
before inspecting
* Note - If belt looks bad, it probably is
Important to your business
An effective preventive maintenance program saves time
and money. Inspecting and replacing belts and faulty
drive components before they fail will reduce costly
downtime and production delays.
What is a good belt maintenance program?
A comprehensive, effective program of preventive
maintenance consists of several elements:
• Maintaining a safe working
environment.
• Regularly scheduled belt drive inspections.
• Proper belt installation
procedures.
• Belt drive performance
evaluations.
• Belt product knowledge.
• Belt storage and handling.
• Troubleshooting.
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SAFETY
Maintaining A Safe Working Environment
Maintain Safe Access to Drives
It is common sense to establish a safe working
environment in and around belt drives. The following
precautions will make belt drive inspection and
maintenance easier
and safer.
Always maintain safe access to the belt drives. Keep area
around drives free of clutter, debris and other obstructions.
Floors should be clean and free of oil and debris to insure
good footing and balance while working on machinery.
Power should be shut off and controls locked
before inspecting
Don’t clutter area around belt drive
Drive Guards
Wear Proper Clothing
Never wear loose or bulky clothes, such as neckties,
exposed shirttails, loose sleeves or loose lab coats around
belt drives. Remove jewelry and tie up or restrain long
hair. Wear gloves while inspecting sheaves or sprockets
to avoid being cut by nicks, burrs or sharply worn pulley
edges. Wear safety glasses to avoid eye injuries. Don’t
be foolish! Wear proper clothing. Always wear proper
personal protective equipment, including gloves, eye & ear
protection, steel toe shoes, and a hard hat.
Always keep drives properly guarded. Every belt drive must
be guarded when in operation. Guard must be designed
and installed according to OSHA standards.
A properly guarded belt drive
A Properly Guarded Belt Drive
A properly designed guard has the following features:
• Completely encloses drive.
• Grills or vents for good ventilation.
• Accessible inspection door or panels.
• Can easily be removed and replaced if damaged.
• Where necessary, should protect the drive from
weather, debris and damage.
No loose or bulky clothing. This technician’s bulky
lab coat is a hazard near moving components
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Follow these precautions to make your preventive maintenance easier.
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DRIVE SHUTDOWN & THOROUGH INSPECTION
Simple Drive Inspection
How Often To Inspect
Begin preventive maintenance with a periodic drive
inspection as a normal part of your maintenance rounds.
Look and listen for any unusual vibration or sound while
observing the guarded drive in operation. A well designed
and maintained drive will operate smoothly and quietly.
The following factors influence how often to inspect a drive.
Inspect guard for looseness or damage. Keep it free of
debris or dust and grime buildup on either the inside or
the outside of the guard. Any accumulation of material on
the guard acts as insulation and could cause drives to run
hotter.
The effect of temperature on belt life is important. For
example, an internal temperature increase of 18°F (or
approximately 36°F rise in ambient drive temperature)
may cut belt life in half. Beware of hot surfaces and the
potential for injury.
Also look for oil or grease dripping from guard. This may
indicate over-lubricated bearings. If this material gets on
rubber belts, they may swell and become distorted, leading
to early belt failure.
It’s a good idea to check motor mounts for proper
tightness. Check take-up slots or rails to see that they are
clean and lightly lubricated.
• Critical nature of equipment
• Drive operating cycle
• Accessibility of equipment
• Drive operating speed
• Environmental factors
• Temperature extremes in environment
Experience with specific equipment is the best guide to
how often to inspect belt drives. Drives operating at high
speeds, heavy loads, frequent stop/start conditions and at
temperature extremes or operating on critical equipment
require frequent inspection.
When To Perform Preventive Maintenance
To help establish a preventive maintenance schedule, keep
the following in mind.
Critical Drives
A quick visual and noise inspection may be needed every
one to two weeks.
Normal Drives
With most drives, a quick visual and noise inspection can
be performed once a month.
Complete Inspection
A drive shutdown for a thorough inspection of belts,
sheaves or sprockets and other drive components may be
required every three to six months.
Remember, a well-designed industrial belt drive is capable
of operating for several years when properly maintained
and used under normal conditions.
Follow the Preventive Maintenance Procedure on the
following page when performing detailed maintenance
during equipment shutdowns.
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DRIVE SHUTDOWN & THOROUGH INSPECTION
Preventive Maintenance Check List
By following these steps, belt drives can be maintained
efficiently and safely.
1. Always turn off the power to the drive. Lock the
control box and tag it with a warning sign “Down
For Maintenance. Do Not Turn Power On.”
Make sure the power is turned off for the
correct drive. Never have contact with a belt drive
unless the system is tagged and locked out.
2. Test to make sure correct circuit has been turned off.
3. Place all machine components in a safe (neutral)
position. Make sure that moving components are
locked down or are in a safe position. Make sure
that fans cannot unexpectedly freewheel.
4. Beware of pinch points. Keep hands and fingers
clear, especially where belts enter sheaves and
sprockets.
5. Remove guard and inspect for damage. Check for
signs of wear or rubbing against drive components.
Clean and realign guard to prevent rubbing if
necessary.
6. Inspect belt for wear or damage. Replace as
needed.
7. Inspect sheaves or sprockets for wear and
misalignment. Replace if worn.
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Turn off power, lock controls and tag
8. Inspect other drive components such as bearings,
shafts, motor mounts and take-up rails.
9. Inspect static conductive grounding system (if used)
and replace components as needed.
10. Check belt tension and adjust as needed.
11. Recheck sheave or sprocket alignment.
12. Reinstall belt guard.
13. Turn power back on and restart drive. Look and
listen for anything unusual.
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DRIVE SHUTDOWN & THOROUGH INSPECTION
Preventive Maintenance Procedure
Once the power is off, locked and tagged, and the machine
components are in safe positions, remove the guard and
begin the inspection.
Using a straight edge to
check alignment
How to Inspect a Belt
Observing signs of unusual belt wear or damage will help
troubleshoot possible drive problems.
Mark or note a point on the belt, or on one of the belts in
a multiple V-belt drive. Wearing gloves, work around the
belt(s), checking for cracks, frayed spots, cuts, or unusual
wear patterns. Beware of pinch points. Keep hands and
fingers clear, especially where belts enter sheaves and
sprockets.
Using a string to check
alignment
Using EZ Align® laser
alignment tool on both
ends
Using EZ Align® laser
alignment tool, showing
reflected laser on emitter
Begin by inspecting the belt
Check the belt for exposure to excessive heat. Excessive
heat can come from a hot environment or from belt slip
that generates heat. A typical maximum environmental
temperature for a properly maintained V-belt is 160˚F to
180˚F. The maximum environmental temperature for a
properly maintained synchronous belt is 185˚F.
Using EZ Align® laser
alignment tool showing
laser line on target
Rubber belts that are running hot, or running in a hot
environment will harden and develop cracks from the
bottom of the belt upwards.
Refer to the PROBLEM/SOLUTION SUMMARY TABLE for
other symptoms.
Belts should be replaced if there are obvious signs of
cracking, fraying, unusual wear or loss of teeth.
How to Check Alignment
While the drive is shut down, it is a good idea to check the
sheaves or sprockets for proper alignment.
To check alignment, use a straight edge, string, or Gates
EZ Align® laser alignment tool.
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If using a straight edge (or string), line the straight edge
along the outside face of both sheaves or sprockets as
shown in the photo. If the drive is properly aligned, the
straight edge or string will contact each sheave or sprocket
evenly. The straight edge or string (pulled tight) should
touch the two outer edges of each sheave or pulley for a
total of four points of contact. Misalignment of sprockets
and shafts will show up as a gap between the outside face
of the sheave or sprocket and the straight edge. Check
for tilting or shaft misalignment by using a bubble level.
For proper alignment, the bubble should be in the same
position as measured on each shaft.
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DRIVE SHUTDOWN & THOROUGH INSPECTION
If using the Gates EZ Align® laser alignment tool, follow
the detailed instructions included with the tool. The EZ
Align laser alignment tool makes it very quick and easy to
check alignment of shafts, sheaves and sprockets. EZ Align
is available with a red laser, or a green laser for outdoor or
brighter environment use.
Misalignment on V-belt drives should be less than 1/2˚
or 1/10” per foot of center distance. Misalignment for
synchronous, Polyflex®, or Micro-V® belts should be less
than 1/4˚ or 1/16” per foot of center distance.
When a synchronous belt drive has been aligned (following
the procedure discussed above in the “How to Check
Alignment” section), do not continue to adjust alignment
in an attempt to make the synchronous belt ride in the
center of the sprocket’s face width. Synchronous belts,
while neutral tracking, will tend to ride in contact with a
flange on one side of the sprockets. Synchronous belts
on drives that are properly aligned will lightly contact the
flanges. Synchronous belts on misaligned drives will ride
hard against the flanges and generate additional noise.
Attempting to adjust a synchronous belt drive’s alignment
to force the belt to ride in the center of the sprocket’s face
width will typically result in misalignment.
Guard Inspection
Check the guard for wear or possible damage. Don’t
overlook wear on the inside of the guard. Check for any
areas that may be contacting the belt. Clean the guard to
prevent it from becoming blocked and closed to ventilation.
Clean off any grease or oil that may have spilled onto the
guard from over-lubricated bearings.
Check Other Drive Components
There are three possible causes and solutions of sheave or
sprocket misalignment:
a. C
orrect alignment by adjusting the motor
shaft into alignment with the driveN shaft.
2. P
arallel Misalignment: Sheaves or sprockets are
not properly located on the shafts.
Check Belt Tension
1. A
ngular Misalignment: The motor shafts and
driven machine shafts are not parallel.
a. L
oosen and reposition one or both sheaves
or sprockets until properly aligned.
3. S
heaves or sprockets are tilted on the shaft due to
incorrect bushing installation.
a. R
otate drive by hand and look for excessive
wobble. Beware of pinch points. Keep hands
and fingers clear, especially where belts
enter sheaves and sprockets. If wobble is
observed, remove and reinstall sheave or
sprocket. Follow the bushing installation
procedures explained in the INSTALLATION
section. Further check alignment by using one
of the previously mentioned methods.
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It is always a good idea to examine bearings for proper
lubrication. Check the motor base bolts and adjustment
screws to make sure they are not loose. If loose, tighten to
the recommended torque value. Make sure that adjustment
screws are free of debris, dirt, or rust.
Following the drive component inspection, the final
step is to check belt tension. Rotate the drive two or
three revolutions by hand and check the belt tension. If
necessary, retension the belt and make a final alignment
check.
If V-belts are undertensioned, they can slip. Slippage
generates heat and will result in cracking and belt failure.
If synchronous belts are undertensioned, they can jump
teeth or ratchet. Ratcheting will damage the belt and
result in premature belt failure.
If belts are overtensioned, belt and bearing life can be
reduced.
The proper way to check belt tension is to use a tension
tester. Gates has a variety of tension testers, ranging from
the simple spring scale type tester to the sophisticated
Sonic Tension Meter.
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DRIVE SHUTDOWN & THOROUGH INSPECTION
Measuring Belt Tension
The spring scale type tester measures how much force
is required to deflect the belt a specified distance at the
center of its span. This is the force deflection method of
tensioning belts.
1. M
easure span length (t). Span length is the distance
from where the belt exits one pulley to where it enters
the next pulley.
Span L
ength, t
The Sonic Tension Meter measures the vibration of the belt
span and instantly converts the vibration frequency into
belt static tension. This is the span vibration method of
tensioning belts.
Deflection
1/64” per inch
of span
Force
2. Position the lower of the two O-Rings using either of
these methods:
For more information, refer to the Troubleshooting Tools
section.
a. O
n the scale reading “Deflection Inches”, set the
O-Ring to show a deflection equal to 1/64” per inch
of span length (t).
b. O
n the scale reading “Inches of Span Length”, set
O-Ring to show a deflection equal to the inches of
measured span length (t).
3. At the center of the span (t), apply force using the
appropriately sized Gates tension testers. Apply the
force perpendicular to the span. If the belt is a wide
synchronous belt or a PowerBand belt, place a piece
of steel or angle iron across the belt width and deflect
the entire width of the belt evenly. Deflect the belt until
the bottom edge of the lower O-Ring is at the correct
deflection distance. If multiple individual V-belts are
used on the drive, the deflection distance can be
measured against an adjacent belt. For drives with only
one belt, use a straightedge or string pulled tight across
the sheaves, sprockets, or top of the belt to establish
a reference line. When the belt is deflected to measure
tension, measure the deflection distance by measuring
from the belt to the straight edge or string reference line.
Force Deflection Tension Method
The force deflection tension method does not directly
measure belt span tension or static tension. The deflection
force is a calculated value that is based on the amount
of static tension required in the belt. Static tension is the
tension force that is actually in the belt, while deflection
force is simply a measurement to check how much static
tension is in the belt. The tension testers used for the
force deflection tension method are available in one, two,
or five barrel configurations. The one barrel tension tester
can measure up to 30 lb. of force; the two barrel tension
tester can measure up to 66 lb. of force; and the five barrel
tension tester can measure up to 165 lb. of force. Add the
force readings from each barrel to determine the total
force being measured.
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DRIVE SHUTDOWN & THOROUGH INSPECTION
4. Find the amount of deflection force on the upper scale
of the tension tester. The sliding rubber O-Ring slides
up the scale as the tool compresses and stays up for a
reading of the deflection force. Read at the bottom edge
of the ring. Remember to slide the O-Ring down before
using again.
5. Installation tension forces should ideally be calculated
for each specific drive. The tension calculations are
included in all Gates drive design manuals. Additionally,
the Gates drive design and selection computer program,
Design Flex® Pro™ can be used to quickly calculate
the proper installation tensions. Design Flex® Pro™
and Design Flex Web® are available at www.gates.com/
drivedesign.
If installation tension values for a specific V-belt
drive are not available, the tables shown can be used to
determine generic tension values based on the V-belt
cross section. As synchronous belt drives are more
sensitive to proper belt tensioning, there are no similar
quick reference tension tables for them.
Recommended Deflection Force Per Belt For
Hi-Power® II V-Belts, Hi-Power II PowerBand Belts
or Tri-Power® Molded Notch V-Belts
Small
V-Belt Sheave
Cross Diameter
Section
(in)
A
AX
B
BX
C
CX
D
3.0
3.2
3.4 - 3.6
3.8 - 4.2
4.6 - 7.0
4.6
5.0 - 5.2
5.4 - 5.6
6.0 - 6.8
7.4 - 9.4
7.0
7.5
8.0 - 8.5
9.0 - 10.5
11.0 - 16.0
12.0 - 13.0
13.5 - 15.5
16.0 - 20.0
Small
Sheave
RPM
Range
Recommended
Deflection Force (Lbs.)
Tri-Power
Speed
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Ratio Hi-Power II Molded Notch
Range Min. Max. Min. Max.
1750
to
3600
2.00
to
4.00
1160
to
1800
2.00
to
4.00
870
to
1800
2.00
to
4.00
690
to
1200
2.00
to
4.00
2.7
2.9
3.3
3.8
4.9
5.1
5.8
6.2
7.1
8.1
9.1
9.7
11.0
12.0
14.0
19.0
21.0
24.0
3.8
4.2
4.8
5.5
7.1
7.4
8.5
9.1
10.
12.0
13.0
14.0
16.0
18.0
21.0
27.0
30.0
36.0
3.8
3.9
4.1
4.3
4.9
7.1
7.3
7.4
7.7
7.9
12.0
12.0
13.0
13.0
13.0
5.4
5.6
5.9
6.3
7.1
10.0
11.0
11.0
11.0
12.0
18.0
18.0
18.0
18.0
18.0
Compare the deflection force with the range of forces
recommended. If less than the minimum recommended
deflection force, the belts are too loose and should be
tightened. If more than the maximum recommended
deflection force, the belts are too tight and should be
loosened.
Recommended Deflection Force Per Belt For
Super HC® V-Belts, Super HC® PowerBand® Belts
Super HC® Molded Notch V-Belts or
Super HC® Molded Notch PowerBand® Belts
V-Belt
Cross
Section
3V
3VX
5VX
5V
8V
Small
Sheave
Diameter
(in)
2.65 - 2.80
3.00 - 3.15
3.35 - 3.65
4.12 - 5.00
5.30 - 6.90
2.20
2.35 - 2.50
2.65 - 2.80
3.00 - 3.15
3.35 - 3.65
4.12 - 5.00
5.30 - 6.90
4.40 - 4.65
4.90 - 5.50
5.90 - 6.70
7.10 - 8.00
8.50 - 10.90
11.80 - 16.00
7.10 - 8.00
8.50 - 10.90
11.80 - 16.00
12.50 - 17.00
18.00 - 24.00
10
PM_Manual_Guts_2015.indd 10
Recommended
Small
Speed Deflection Force (Lbs.)
Sheave RPM Ratio
Range
Range Minimum Maximum
1200-3600
1200-3600
1200-3600
900-3600
900-3600
1200-3600
1200-3600
1200-3600
1200-3600
1200-3600
900-3600
900-3600
1200-3600
1200-3600
1200-3600
600-1800
600-1800
400-1200
600-1800
600-1800
400-1200
600-1200
400-900
2.00
to
4.00
2.00
to
4.00
2.00
to
4.00
2.00
to
4.00
2.00
to
4.00
3.0
3.3
3.7
4.4
4.8
2.8
3.2
3.5
3.8
4.1
4.8
5.8
9.0
10.0
11.0
13.0
14.0
15.0
11.0
13.0
14.0
4.3
4.8
5.4
6.4
7.1
4.1
4.7
5.1
5.5
6.0
7.1
8.6
13.0
15.0
17.0
19.0
20.0
23.0
16.0
18.0
21.0
28.0
32.0
41.0
48.0
®
®
www.gates.com/drivedesign
12/16/14 12:07 PM
DRIVE SHUTDOWN & THOROUGH INSPECTION
Recommended Deflection Force Per Belt For Metric-Power V-Belts
V-Belt Small Sheave
Cross
Diameter
Section
(in)
SPA
SPB
SPC
XPZ
XPA
XPB
XPC
10X
Speed
Ratio
Range
Minimum
Maximum
1200-3600
3.2
4.5
2.80
1200-3600
3.6
5.0
2.95
3.15
1200-3600
4.1
5.9
3.35
3.74
1200-3600
4.5
6.8
3.94
4.92
900-3600
5.4
7.7
5.20
7.09
900-3600
5.9
8.6
3.15
3.74
1200-3600
5.4
7.3
3.94
4.92
900-3600
5.20
7.87
600-1800
8.35
9.84
600-1800
4.41
5.91
1200-3600
6.30
7.87
600-1800
2.00
to
4.00
2.00
to
4.00
2.00
to
4.00
9.5
8.6
12.7
9.1
13.6
10.4
16.3
13.2
20.0
16.3
22.7
17.2
26.3
18.1
27.2
23.1
34.0
27.2
40.8
8.35
11.02
600-1800
15.75
400-1200
7.09
9.29
600-1800
9.84
13.98
400-1200
14.76
20.87
400-900
2.20
1200-3600
3.2
5.0
2.36
2.48
1200-3600
3.6
5.9
2.64
2.80
1200-3600
4.1
6.4
2.95
3.15
1200-3600
4.5
6.8
3.35
3.74
1200-3600
5.0
7.3
3.94
4.92
900-3600
5.9
8.6
5.20
7.09
900-3600
7.3
10.9
3.15
4.92
900-3600
8.2
12.2
2.00
to
4.00
2.00
to
4.00
2.00
to
4.00
5.20
7.87
900-3600
10.0
14.1
4.41
4.65
1200-3600
10.9
16.3
4.92
5.51
1200-3600
12.2
18.6
5.91
6.69
1200-3600
13.6
21.3
7.09
7.87
600-1800
16.3
24.0
17.2
24.9
18.6
29.0
22.7
34.0
29.5
43.1
36.3
49.9
2.00
to
4.00
8.35
11.02
600-1800
11.81
15.75
400-1200
7.09
9.29
600-1800
9.84
13.98
400-1200
14.76
20.87
400-900
2.20
1200-3600
2.8
4.1
2.35
2.50
1200-3600
3.2
4.7
2.65
2.80
1200-3600
3.5
5.1
3.00
3.15
1200-3600
3.8
5.5
3.35
3.65
1200-3600
4.1
6.0
4.12
5.00
900-3600
4.8
7.1
5.30
6.90
900-3600
5.8
8.6
3.8
5.4
3.9
5.6
4.1
5.9
4.3
6.3
3.20
17X
6.4
11.81
2.00
to
4.00
2.00
to
4.00
3.00
13X
Recommended
Deflection Force (Lbs.)
2.64
2.20
SPZ
Small
Sheave
RPM
Range
1750
to
3600
2.00
to
4.00
3.40
3.60
3.80
4.20
4.60
7.00
4.9
7.1
4.60
7.1
10.0
7.3
11.0
5.00
5.20
5.40
5.60
6.00
6.80
7.40
9.40
1160
to
1800
2.00
to
4.00
7.4
11.0
7.7
11.0
7.9
12.0
®
PM_Manual_Guts_2015.indd 11
®
Span Vibration Method
The Gates Sonic Tension Meter can be used with all Gates
belts. The Sonic Tension Meter measures the vibration
in the belt span, and converts that measurement into a
reading of the actual static tension in the belt. To use the
Sonic Tension Meter, you will need to enter the belt unit
weight, belt width for synchronous belts or number of ribs
or strands for V-belts, and the span length. To measure
the span vibration, press the “Measure” key on the
meter, tap the belt span to vibrate the belt, and hold the
microphone approximately 3/8” to 1/2” away from the back
of the belt. The Sonic Tension Meter will display the static
tension, and can also display the vibration frequency.
Since the span vibration method is intended to be a very
accurate method of measuring actual tension in a belt,
it is important that the proper recommended tension
is calculated for the specific belt drive. Procedures
for calculating belt tension are included in each of the
appropriate Gates drive design manuals. To determine
the belt tension recommended for specific drive
applications, refer to the appropriate belt drive design
manual, download the Gates belt drive selection program
DesignFlex® Pro™ at www.gates.com/drivedesign, or
dowload the PT Toolkit mobile app at www.gates.com/
pttoolkit. Alternatively, Gates Power Transmission Product
Application engineers can be contacted at
ptpasupport@gates.com or (303) 744-5800.
On-the-go belt tensioning
information is available in
our PT Toolkit mobile app.
Download today.
www.gates.com/drivedesign
11
12/16/14 12:07 PM
DRIVE SHUTDOWN & THOROUGH INSPECTION
The adjusted belt weights for use with the Gates Sonic Tension Meter are shown in the following table.
Belt
Product Family
Super HC® V-Belts
Super HC® XP™ V-Belts
Predator® V-Belts
Tri-Power® V-Belts
Hi Power® II V-Belts
Hi Power® II Dubl-V Belts
Micro-V® Belts
Metric Power™ V-Belts
Lengths ≤ 3000mm
12
PM_Manual_Guts_2015.indd 12
Belt
Cross Section
Belt
Type
Adjusted Belt Weight
(grams/meter)
3VX
5VX
8VX
3V
5V
8V
3VX
5VX
3V
5V
8V
5VXP
5VXP
5VP
8VP
AP
BP
CP
SPBP
SBCP
3VP
5VP
8VP
BP
CP
AX
BX
CX
AX
BX
CX
A
B
C
D
E
A
B
C
D
AA
BB
CC
DD
H
J
K
L
M
XPZ
XPA
XPB
XPC
10X
13X
17X
Single
Single
Single
Single
Single
Single
PowerBand®
PowerBand®
PowerBand®
PowerBand®
PowerBand®
Single
PowerBand®
Single
Single
Single
Single
Single
Single
Single
PowerBand®
PowerBand®
PowerBand®
PowerBand®
PowerBand®
Single
Single
Single
PowerBand®
PowerBand®
PowerBand®
Single
Single
Single
Single
Single
PowerBand®
PowerBand®
PowerBand®
PowerBand®
Single
Single
Single
Single
Single
Single
Single
Single
Single
Single
Single
Single
Single
Single
Single
Single
53
140
383
72
200
510
65
157
96
241
579
163
®
®
217
528
114
174
323
208
375
89
217
528
212
332
79
136
216
100
163
281
95
168
275
553
965
151
200
342
663
125
194
354
750
5.3
7.0
18
29
109
51
87
156
249
44
82
138
www.gates.com/drivedesign
12/16/14 12:07 PM
DRIVE SHUTDOWN & THOROUGH INSPECTION
Belt
Product Family
Metric Power™ V-Belts
Lengths ≤ 3000mm
Truflex® V-Belts
PoweRated® V-Belts
Polyflex® V-Belts
PowerGrip® Timing Belts
PowerGrip® Timing Twin Power® Belts
PowerGrip® HTD® Belts
PowerGrip® HTD® Twin Power® Belts
PowerGrip® GT®2 Belts
PowerGrip® GT®2 Twin Power® Belts
PowerGrip® GT®3 Belts
Poly Chain® GT®2,
Poly Chain® GT® Carbon™ and
Poly Chain® Carbon™ Volt™ Belts
Belt
Cross Section
Belt
Type
Adjusted Belt Weight
(grams/meter)
SPZ
SPA
SPB
SPC
13X
17X
2L
3L
4L
5L
3L
4L
5L
3M
5M
7M
11M
3M
5M
7M
11M
MXL
XL
L
H
XH
XXH
XL
L
H
3M
5M
8M
14M
20M
3M
5M
8M
14M
2M
3M
5M
8M
14M
3M
5M
8M
Single
Single
Single
Single
Single
Single
Single
Single
Single
Single
Single
Single
Single
Single
Single
Single
Single
JB®
JB®
JB®
JB®
Synchronous
Synchronous
Synchronous
Synchronous
Synchronous
Synchronous
Synchronous
Synchronous
Synchronous
Synchronous
Synchronous
Synchronous
Synchronous
Synchronous
Synchronous
Synchronous
Synchronous
Synchronous
Synchronous
Synchronous
Synchronous
Synchronous
Synchronous
Synchronous
Synchronous
Synchronous
72
115
186
337
77
138
19
38
66
108
45
71
119
3.5
9.9
24
49
5.2
11
30
64
1.3
2.4
3.2
3.9
11.3
14.9
1.9
3.2
4.6
2.4
3.9
6.2
9.9
12.8
2.7
4.6
7.2
12.3
1.4
2.8
4.1
5.5
9.6
2.8
4.1
6.9
14M
2M
3M
5M
8M
14M
5M
8M
14M
19M
Synchronous
Synchronous
Synchronous
Synchronous
Synchronous
Synchronous
Synchronous
Synchronous
Synchronous
Synchronous
11.4
1.4
2.8
4.1
5.8
9.7
3.0
4.7
7.9
10.5
®
PM_Manual_Guts_2015.indd 13
®
www.gates.com/drivedesign
13
12/16/14 12:07 PM
INSTALLATION
How to Install Belts
Inspection
When a belt is being installed, the same basic steps must
be followed, regardless of whether the belt is a
V-belt or a synchronous belt.
6.Inspect the old belt for any unusual wear. Excessive
or unusual wear may indicate problems with the
drive design or past maintenance procedures. Refer
to the Problem/Solution Summary Table in the
Belt Performance and Troubleshooting section for
guidelines in matching belt appearance to possible
problem causes.
Preparation
1.Confirm that the power is off, locked, and tagged.
Never work on a belt drive until this important step is
completed. Wear proper safety equipment (hardhat,
gloves, safety glasses, steel toe shoes).
2.Remove belt guard and place away from drive so that
it does not interfere with working on the drive.
Removal
3. Loosen motor mounting bolts or adjusting screws.
4. Move the motor in until the belt is slack and can be
removed easily without prying. Never pry off a belt, as
the sheave or sprocket can be damaged. Prying off
belts also adds the risk of injury.
7. Inspect the sheaves or sprockets for unusual or
excessive wear. Belt life will be reduced if the sheaves
or sprockets are worn. Wear gloves for protection
from nicks or sharp surfaces.
For V-belt sheaves: Inspect grooves for wear and
nicks. Use Gates sheave gauges to determine if the
grooves are worn. Place the proper sheave gauge into
the sheave groove and check for wear. If more than
1/32” of wear can be seen between the gauge and
groove side wall, the sheaves are worn and should be
replaced. A light source such as a flashlight may be
used to backlight the gauge.
Do not be misled by “shiny” grooves. Grooves that are
“shiny” are often polished because of heavy wear.
Inspect the sheave grooves for rust or pitting. If rusted
or pitted surfaces are found, the sheave should be
replaced.
For Synchronous sprockets: Inspect sprocket grooves
for unusual or excessive wear. Check for excessive
wear by both visually inspecting the grooves and by
running your finger along the sprocket grooves. If you
can feel or see noticeable wear, the sprockets are
worn and should be replaced.
5. Remove old belt.
14
PM_Manual_Guts_2015.indd 14
®
®
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12/16/14 12:07 PM
INSTALLATION
Do not be misled by “shiny” grooves. Grooves that are
“shiny” are often polished because of heavy wear.
Inspect the sprocket grooves for rust or pitting. If
rusted or pitted surfaces are found, the sprocket
should be replaced.
Check the sprocket flanges and make sure that they
are not loose or bent. Bent flanges can interfere with
the belt and cause premature belt wear and failure.
8. If necessary, clean sheave and sprocket grooves by
wiping the surface with a rag slightly dampened with
a light, non-volatile solvent. Do not sand or scrape the
grooves to remove debris.
Installation
9. If necessary, install new sheaves or sprockets. Refer
to page 14 for detailed instructions for installing QD or
Taper-Lock® bushings.
10.Check the sheave or sprocket alignment. In order
to achieve optimum belt life, it is important that the
drive’s sheaves or sprockets be aligned properly. Use
a straightedge or Gates EZ Align® laser alignment
tool. Adjust the sheave or sprocket position as
necessary.
11.Install the new belt or set of belts.
Replace all belts on multiple V-belt drives. Never
replace a single belt or a portion of a multiple belt
drive. Always use belts from the same manufacturer
on a multiple belt drive. If a new belt is used with old
belts, the load will not be shared evenly between the
belts on a multiple V-belt drive. Mixing new and old
belts very possibly could lead to premature belt failure
and uneven sheave wear.
When installing the belt, make sure that there is
clearance to slip the belt over the sheave or sprocket.
Do not pry or use force to install the belt. Do not roll
the belt onto the drive.
12.Adjust the motor base adjustment screws to take up
the center distance on the belt drive until the belts are
tight.
13.Check belt tension, using a tension gauge or Sonic
Tension Meter. Adjust the belt drive’s center distance
until the correct tension is measured.
On multiple belt drives, some belts may appear to
hang unevenly when installed. It is normal for belts
within RMA length and matching tolerances to have
noticeable differences in the distance the belt span
sags. This is called the “catenary effect”.
®
PM_Manual_Guts_2015.indd 15
®
Catenary effect is a curve made by a cord of uniform
weight suspended between two points.
Follow the recommended run-in and retensioning
procedure to minimize the visible difference in belt
sag.
14.Rotate the belt drive by hand for a few revolutions.
Re-check the belt tension and adjust as necessary.
15.Re-check the drive alignment and adjust as
necessary.
Completion
16.Secure motor mounting bolts to the correct torque.
17.Re-check the belt tension and adjust as necessary.
Tightening the motor mounting bolts may have
changed the belt tension.
18.Replace the belt guard.
19.Start the drive, looking and listening for any unusual
noise or vibration. If possible, shut down the drive and
check the bearings and motor for unusual heat. If the
motor or bearings are hot, the belt tension may be
too high, or bearings may not be properly lubricated.
Temperatures can be checked with an infrared
pyrometer.
V-Belt Run-In Procedure
20.A run-in procedure is recommended for all V-belt
drives so that the optimum belt life can be achieved. A
run-in consists of starting the drive and letting it run
under full load for up to 24 hours. If a 24 hour run-in
is not possible, let the belt drive run overnight, to the
next shift, or at least a few hours. After the belts have
run-in, stop the belt drive and check the belt tension.
Running the belts under full load for an extended
period of time will seat the V-belts into the sheave
grooves.
V-belt tension will drop after the initial run-in and
seating process. This is normal. Adjust the belt
tension as necessary.
Since tension in V-belts will drop after the initial runin and seating process, failure to check and retension
the belt will result in low belt tension and belt
slippage. This slippage will result in premature belt
failure.
www.gates.com/drivedesign
15
12/16/14 12:07 PM
INSTALLATION
How to Install Taper-Lock® and QD® Bushed Sheaves and
Sprockets
It is important that new or replacement sheaves or
sprockets be properly installed. Most sheaves or sprockets
are attached to a shaft with a tapered bushing that fits a
mating tapered bore in the sheave or sprocket. Bushings
come in several different bore size diameters. This allows
for a reduction in the parts inventory required in your plant
because one bushing size with multiple bore sizes can
be used with a number of different sizes of sheaves or
sprockets.
There are two styles of bushings: Taper-Lock® and QD®.
Installation and removal instructions for each style are
noted below.
Taper-Lock Type Sprocket Installation and Removal
®
5.Alternately torque screws to the recommended
torque level specified in the table below. Note: Using
worn hex key wrenches may damage screw heads
preventing proper tightening torque and removal.
6.Check the alignment and sprocket axial runout
(wobble), and correct as necessary.
Taper-Lock® Bolt Torque
Bolts
Torque Wrench
lb-ft
lb-in
Bushing Style
Qty. 1008
2
1/4-20 x 1/2
4.6
1108
2
1/4-20 x 1/2
4.6
55
1210
2
3/8-16 x 5/8
14.6
175
1610
2
3/8-16 x 5/8
14.6
175
2012
2
7/16-14 x 7/8
23.3
280
2517
2
1/2-13 x 1
35.8
430
3020
2
5/8-11 x 1 1/4
66.7
800
3525
3
1/2-13 x 1 1/2
83.3
1000
Size
55
4030
3
5/8-11 x 1 3/4
141.7
1700
4535
3
3/4-10 x 2
204.2
2450
5040
3
7/8-9 x 2 1/4
258.3
3100
6050
3
1 1/4-7 x 3 1/2
651.7
7820
7060
4
1 1/4-7 x 3 1/2
651.7
7820
7.To increase and ensure bushing gripping force, firmly
tap the bushing face using a drift or punch (do not hit
bushing face directly with hammer), then re-torque
screws to the recommended torque level.
To Install Taper-Lock® Type Hardware
1.Clean the shaft, bushing bore, tapered bushing barrel
and the sprocket hub bore of all oil, paint and dirt
(Note: Lubricants are not to be applied to bushings
or sprockets). Remove any burrs with a file or emery
cloth.
2.Insert bushing into sprocket hub matching hole
patterns, not threaded holes. Tightening holes (“ ” in
diagram above) will be threaded on the sprocket hub
side only. Removal holes (“ “ in diagram above) will
be threaded on the bushing side only. Thread screws
into the installation or “ ” holes.
3.LIGHTLY oil the set screws and thread them into the
half-threaded holes indicatad in the diagram above.
(Note: Do not lubricate the bushing taper, hub taper,
bushing bore, or the shaft. Doing so could result in
sprocket breakage.)
4.With the key in the shaft keyway ” ”, position the
assembly onto the shaft at the desired location.
Allow for small axial sprocket movement on bushing
during tightening. (Note: When mounting sprockets
on vertical shafts, precautions must be taken to
prevent the sprocket/bushing from falling during the
tightening).
16
PM_Manual_Guts_2015.indd 16
®
®
Note: Do not continue tightening screws further after
target torque has been reached as bushing over
insertion and hub fracture may occur.
8.Recheck all screw torque values after the initial drive
run-in, and periodically thereafter. Repeat steps 5
through 7 if loose.
To Remove TL Type Hardware
1.Release belt tension and lift belt off of sprockets
(Note: Do not pry or roll belts off).
2.Loosen and remove screws securing sprockets to
bushings.
3.Insert screws into removal holes (“ “).
4.Alternately tighten screw or screws in small but equal
increments until sprockets disengage from bushings.
5.Remove sprockets and bushings from shafts as
necessary.
www.gates.com/drivedesign
12/16/14 12:07 PM
INSTALLATION
tapped holes in sheave hub (Note: Install M thru
S bushings so that the two tapped removal holes
in sheave hubs are located far away from bushing
saw cuts). Finger-tighten the screws.
QD Type Hardware Installation and Removal
To Install QD Type Hardware
1.Clean the shaft, bushing bore, tapered bushing barrel
and the sheave hub bore of all oil, paint and dirt
(Note: Lubricants are not to be applied to bushings
or sheaves). Remove any burrs with a file or emery
cloth.
2.Determine the type of mounting that will be used:
Conventional Mounting
Reverse Mounting
3.
Conventional Mounting:
A.Insert key into the shaft keyway (Note: If key is
furnished with bushing, it is special and must be
used).
B.Insert a screw driver blade (or similar) into the
bushing flange saw cut to enlarge bore slightly
(Caution: Excessive enlargement can split
bushing).
C.Slide bushing onto shaft with the flange side
towards the equipment. Position bushing and
tighten set screw to prevent sliding on shaft.
D.Place sheave onto bushing and insert cap screws.
Align drilled holes in sheave hub with tapped holes
in bushing flange. (Note: Install M thru S bushings
so that the two tapped removal holes in sheave
hubs are located far away from bushing saw cuts).
Finger-tighten the screws.
4.
Reverse Mounting:
A.Insert key into the shaft keyway (Note: If key is
furnished with bushing, it is special and must be
used).
B. Place sheave onto shaft without bushing.
C.Insert a screw driver blade (or similar) into the
bushing flange saw cut to enlarge bore slightly
(Caution: Excessive enlargement can split
bushing).
D.Slide bushing onto shaft with flange facing
outward, away from equipment. Position bushing
and tighten the set screw enough to prevent
sliding on shaft.
5.When positioned to the desired location, secure
the first sheave/bushing assembly to the shaft by
tightening the bushing cap screws. Allow for small
axial sheave movement on bushing during tightening.
Using a torque wrench, tighten the cap screws evenly
in an alternating pattern until the recommended
torque level in the following table is reached.
(Note: When mounting sprockets on vertical shafts,
precautions must be taken to prevent the sheave/
bushing from falling during the tightening).
Note: Do not continue tightening cap screws further after
target torque has been reached as bushing over insertion
and hub fracture may occur. The gap between the bushing
flange and sheave hub is intentional and necessary.
QD Bolt Torque
Bushing Style
Qty. Bolts
Size
Torque Wrench
lb-ft
lb-in
H
2
1/4 x 3/4
7.9
JA
3
10-24 x 1
4.5
95
54
SH & SDS
3
1/4-20 x 1 3/8
9.0
108
SD
3
1/4-20 x 1 7/8
9.0
108
SK
3
5/16-18 x 2
15.0
180
SF
3
3/8-16 x 2
30.0
360
720
E
3
1/2-13 x 2 3/4
60.0
F
3
9/16-12 x 3 5/8
75.0
900
J
3
5/8-11 x 4 1/2
135.0
1620
M
4
3/4-10 x 6 3/4
225.0
2700
N
4
7/8-9 x 8
300.0
3600
W
4
1 1/8-7 x 11 1/2
600.0
7200
S
5
1 1/4-7 x 15 1/2
750.0
9000
P
4
1-8 x 9 1/2
450.0
5400
To Remove QD Type Hardware
1.Release belt tension and lift belts off of sheaves
(Note: Do not pry or roll belts off).
2.Loosen and remove cap screws securing sheaves to
bushings. If applicable, loosen keyway set screws.
3.Insert cap screws into the tapped removal holes
adjacent the drilled holes.
4.Alternately tighten cap screws in small but equal
increments until sheaves disengage from bushings.
(Note: Uneven or excessive pressure on cap screws
can break bushing flanges making removal extremely
difficult)
5.Remove sheaves and bushings from shafts as
necessary.
E.Place sheave onto the bushing and insert cap
screws. Align drilled holes in bushing flange with
®
PM_Manual_Guts_2015.indd 17
®
www.gates.com/drivedesign
17
12/16/14 12:07 PM
BELT STORAGE AND HANDLING
Storage Recommendations
Proper preventive maintenance should not be limited to the
actual belt drive operating on equipment, but should also
include following proper storage procedures. In order to
retain their serviceability and dimensions, proper storage
procedures must be followed for all belt types. Quite often
premature belt failures can be traced to improper belt
storage procedures that damaged the belt before it was
installed on the drive. By following a few common sense
steps, these types of belt failures can be avoided.
General Guidelines
Recommended
Belts should be stored in a cool and dry environment with
no direct sunlight. Ideally, less than 85˚ F and 70% relative
humidity.
Store on shelves or in boxes or containers. If the belt is
packaged in a box, like Poly Chain® GT® Carbon™ belts,
store the belt in its individual box.
V-belts may be stored by hanging on a wall rack if they
are hung on a saddle or diameter at least as large as the
minimum diameter sheave recommended for the belt
cross section.
When the belts are stored, they must not be bent to
diameters smaller than the minimum recommended
sheave or sprocket diameter for that cross section. (see
Technical Information section) Belts should not be stored
with back bends that are less than 1.3 times the minimum
recommended sheave or sprocket diameter for that cross
section.
Do not crimp belts during handling or while stored.
Belts are crimped by bending them to a diameter smaller
than the minimum recommended diameter sheave or
sprocket for that cross section. Do not use ties or tape to
pull belt spans tightly together near the “end” of the belt.
This will crimp the belt and cause premature belt failure.
Do not hang on a small diameter pin that suspends all of
the belt weight and bends the belt to a diameter smaller
than the minimum recommended sheave or sprocket
diameter. Improper storage will damage the tensile cord
and the belt will fail prematurely. Handle belts carefully
when removing from storage and going to the application.
Do not inadvertently crimp or damage the belts by careless
handling.
Storage Methods
V-Belts
V-belts can be coiled in loops for storage purposes. Each
coil results in a number of loops. One coil results in three
loops, two coils results in five loops, etc. The maximum
number of coils that can be used depends on the belt
length. If coiling a belt for storage, consult the table on the
next page and follow the limits shown.
If stored in containers, make sure that the belt is not
distorted when in the container. Limit the contents in a
container so that the belts at the bottom of the container
are not damaged by the weight of the rest of the belts in
the container.
Not Recommended
Belts should not be stored near windows, which may
expose the belts to direct sunlight or moisture.
Belts should not be stored near heaters, radiators, or in
the direct airflow of heating devices.
Belts should not be stored near any devices that generate
ozone. Ozone generating devices include transformers and
electric motors.
Belts should not be stored where they are exposed to
solvents or chemicals in the atmosphere.
Do not store belts on the floor unless they are in a
protective container. Floor locations are exposed to traffic
that may damage the belts.
18
PM_Manual_Guts_2015.indd 18
®
®
www.gates.com/drivedesign
12/16/14 12:07 PM
BELT STORAGE AND HANDLING
Belt Cross Section
3L, 4L, 5L, A, AX, AA, B, BX, 3V, 3VX, 9R, 13R, 13C, 13CX, 13D, 16R, 16C, 16CX, 9N
Belt Length (in)
Belt Length (mm)
Number of Coils
Number of Loops
Under 60
Under 1500
0
1
60 up to 120
1500 up to 3000
1
3
120 up to 180
3000 up to 4600
2
5
180 and over
4600 and over
3
7
Under 75
Under 1900
0
1
75 up to 144
1900 up to 3700
1
3
144 up to 240
3700 up to 6000
2
5
240 and over
6000 and over
3
7
Under 120
Under 3000
0
1
120 up to 240
3000 up to 6100
1
3
BB, C, CX, 5V,
5VX, 16D, 22C,
22CX, 15N
240 up to 330
6100 up to 8400
2
5
CC, D, 22D, 32C
330 up to 420
8400 up to 10,600
3
7
420 and over
10,600 and over
4
9
Under 180
Under 4600
0
1
180 up to 270
4600 up to 6900
1
3
270 up to 390
6900 up to 9900
2
5
390 up to 480
9900 up to 12,200
3
7
Over 480
12,200 and over
4
9
8V, 8VX, 25N
PowerBand® V-Belts, Synchronous Belts, Micro-V® Belts
Variable Speed V-Belts
Poly Chain GT Carbon™ belts are shipped in individual
boxes. Poly Chain® GT® Carbon™ belts should be stored in
the box in which it was shipped.
Variable speed belts have a thicker cross section and are
more sensitive to distortion than other V-belts. Do not hang
variable speed belts from pins, racks, or saddles. Store
variable speed belts on their edge on shelves. Variable
speed belts that are in sleeves may be stacked, taking care
to avoid distorting the belts at the bottom of the stack.
®
®
These belts may be stored by hanging on a wall rack if they
are hung on a saddle or diameter at least as large as the
minimum diameter sheave or sprocket recommended for
the belt cross section, and the belts are not distorted.
PowerBand® V-belts, Synchronous belts, and Micro-V®
belts up to 120 inches (3000 mm) may be stored in a
nested configuration. Nests are formed by laying a belt
on its side on a flat surface and placing as many belts
inside the first belt as possible without undue force. When
nests are formed, do not bend the belts to a diameter
that is smaller than the minimum recommended sheave
or sprocket diameter. Nests may be stacked without
damaging the belts if they are tight and stacked with each
nest rotated 180˚ from the nest below.
PowerBand V-belts and Micro-V belts over 120 inches
(3000 mm) may be rolled up and tied for shipment. These
individual rolls may be stacked for easy storage. When the
belts are rolled, they must not be bent to a diameter that is
smaller than the minimum diameter recommended for the
cross section.
®
®
Storage Effects
In order to retain their serviceability and dimensions,
proper storage procedures must be followed for all belt
types. Quite often premature belt failures can be traced to
improper belt storage procedures that damaged the belt
before it was installed on the drive.
Belts may be stored up to six years if properly stored at
temperatures less than 85˚F and relative humidity less
than 70%.
If the storage temperature is higher than 85˚ F, the storage
limit for normal service performance is reduced by one
half for each 15˚F increase in temperature. Belts should
never be stored at temperatures above 115˚F.
At relative humidity levels above 70%, fungus or mildew
may form on stored belts. This has minimal affect on belt
performance, but should be avoided.
When equipment is stored for prolonged periods of time
(over six months), the belt tension should be relaxed
so that the belt does not take a set, and the storage
environment should meet the 85˚F and 70% or less relative
humidity condition. If this is not possible, belts should be
removed and stored separately in a proper environment.
®
PM_Manual_Guts_2015.indd 19
®
www.gates.com/drivedesign
19
12/16/14 12:07 PM
3V
3V
3V
21/64"
1”
21/64" 21/64"
8VX
8VX
8VX
8VX
IDENTIFICATION
BP BELT
CP
5VP
5VX
5VX5VX
3VX 5/16”
21/64"
3/8"
AP
1"
5VX 13/32”
3/8"
1"
35/64"
5/8"
5/8"
5/8"
3/8"
5/8”
7/8”
5/8"
21/32”
1/2”
17/32”
53/64"
3/8"
35/64"
21/64" 21/64"
35/64”
5V
37/64"
1"
5/8"
5/8"
5/8"
5/8"
3/8"
5V
®
3VX
3/8"
3/8"
21/64"
*
35/64"
21/64"
21/64"
23/64"
3/8"
3/8"
21/32”
3VX 23/64"
3VX
3VX
23/64"
II V-Belts
1/2”
®
Hi-Power
1/2"
A
3/8"
A 21/64"
3VX
1/2"
1/2"
1-1/4"
5/16"
A
C
3VX
35/64"
7/8"
7/8"23/64"
21/64"
C C
E 8V
E E5V E
17/32"
17/32"
13/32"
1"
13/32"
*
*
®
Tri-Power
V-Belts
D
3/4"
1-1/4"
1-1/4"
1-1/4"
DDD
®
21/32”3/8"
Tri-Power
3/8" V-Belts
1/2”
3/4"
3/4"
3V
3V 23/64"
17/32"
*
29/32"
1-1/2”
5/8"
3/4"
23/64"
21/32"
BX
5V
3V
17/32”
7/8"
AX
1/2"
5/16"
1/2"
5/16"
BX
21/32"
1/2"
13/32"
5/16"
™
5/16"
23/64"
13/32"
7/8"
1/2"
13/32"
7/8"
5/16"
A 10mm
3/8"
3/8"
23/64"
XPA
XPZ
1-1/4"
5/8"
13mm
13/32"
23/64"
XPB
E
D
D
Multi-Speed Belts
1/2"
1/2"
A
BA
5/16"
20
1-1/4"
D
PM_Manual_Guts_2015.indd 20
1/2"
AX
3/4"
13/32"
5/16"
1-1/4"
D
5/16"
C
B
1-1/2”
21/32"
EBX
3/4"
1/2"
17/32"
13/32" 5/16"
A
®
AX
5/8"
3/8"
21/32"
17/32"
13/
7/8
7/8"
35/64"
29/32" 29/32"
22mm
29/32"
Pow
16mm
21/32"
7/8"
7/8"
7/16"
18mm
21/32"
21/32"
17/32"
17/32"
1/2"
13mm
13mm
21/32"
21/32"
17/32"
17/32" 21/32"
1-1/4"
13/32" 5/16"
1
5/8"
C5VX
3VP
37/64"
29/32"
23/64"
10X
10X
ED
7/8"
C
B
17/32"
13/32"
1-1/2”7/8"
ECX
1/2"
17/32"
13/32"
29/32"
AX
21/32"
B
5/16"
13X
13X
23/64"
37/64"
1"
11/32"
C
17X
C 17X
A
3/4" 11/32"
A29/32"
C
9/16"
21/32"
BX
17/32"
29/32"
13/32"
1"
1/2"
A
11/32"
29/32"
10mm
MXL
5VP
XL
11/32"
29/32"
C
CX
7/8"
B
7/8"11/32"
A7/16"
CP
DC
1-1/4"
7/8"
9/16"
17/32"
7/8"
37/64"
21/32"
7/16"
29/32"
1-1/4"
XH
8
D
9/16"
XXH
21/32"
B
7/16"
1-1/4"
9/16"
25/32"
9/16"
12/16/14 12:07 PM
7/8"
L
BH
7/8"
C
8
9/16"
29/32"
5/8"
3/8"
21/32"
1/2"
7/8"
7/8"
17/32"
9/16"
37/64"
23/64"
9/16"
1-1/2”
E
17/32"
25
18m
37/64"
13mm
Pow
5VP3VP
17mm
7/8"
25/32"
7/8"1"
8VP 8VP
A
1/2"
1/2"
25/32"
18mm
23/64"
9/16"
5/8"
7/8"
13/32" 8mm
37/64"
5/8"
CX
CXCP8VP
CP
CP
5VX
13mm
16mm
3VP
13mm
7/16"
25/32"
22mm
1-1/4" 1-1/4"
17/32"17/32"
9/16"
3VP
23/64"
7/16"
3/8"
5/8"
3/8"
17/32"
5/16"6mm
1-1/2”
1-1/4"
22mm
1-1/4"
29/32"29/32"
29/32"
®
7/8" 7/8"
7/8"
7/8"
®
7/16"
37/64"
3VP
3/8"
5/8"
www.gates.com/drivedesign
3/4"
7/8"
1"
1"
21/32"
53/64"
7/8" 16mm
1"
3/8"
9/16"
9/16"
7/8"
23/64"
13mm
5/16" 5/16" BX
AX AX
BX13/32"13/32"
A
21/32"
DECXBX
13/32"29/32"
5/16"
1"
13/32"
5/16"
1-1/2”1-1/2”
11/32"
21/32"
21/32"
37/64"
®
1/2" 1/2"
1/2"
29/32"
®
37/64" 37/64"
1/2"
1" 29/32"
1"
13/32" 5/8"
37/64"
37/64"
5/16"
9/16"
29/32"
7/8"
10mm
18mm
1-1/2”7/8"
21/32"
1-1/4"
®
1/2"
C
35/64"
5/8"
5/8"
SPCP3mm
C C 29/32”B SPBP
B B SPBP
CP
BP AP CP5mm
BP
BP
AP
5V
B B B
A A
1/2"
17/32"
13/32"
3/4"
7/8"
37/64"
7/8" 7/8"
21/32"
13/32"13/32"
1/2"
5/8"
8V
XPC
7/8"
8VP5mm
37/64"
5/8"
35/64"
21/32"21/32"
11/32"
23/64"
5VX
3VX
37/64"
SPC*/XPC
3VXSPC
23/64"
*Also available in Predator® belt3/4"
construction.
7/8"
**Also available in XP™
21/32"
21/32"belt construction.
3mm
5/8"
14mm
8VP
5VXBP AP CP BP
AP 5VX
8VP 5VP8VP
8VX
5VP
8VP
8VP
8VP
5V
®
Tri-Power , Predator
and XP™
21/32"
5/16"
3/8"
37/64"
1-1/2”
1-1/4"
18mm
1"
5VP 5VP
* 1-1/2”
16mm
3/4" 3/4"
7/8"
16mm 7/8"
1"
C5VXB
1/2"
18mm
5VP 5VP5VP 8mm
1"
5/8" 5/8"
5/8"
5/16"
35/64"
35/64"
22mm
21/32"
5/8"
22mm
18mm
18mm
29/32"
29/32"
53/64”
7/8"
1"
8VX
23/64"
1/2"
9/16"
37/64"
23/64" 29/32"
17/32" 17/32"
29/32"
17/32"
B A
5VX
SPZ/XPZ
SPA 3VXSPB*/XPB
SPZ 3VXSPA/XPA
SPB
8mm
3V
1"
7/8"
3/8"
16mm
13mm
10mm
7/8"
3/8"
21/32" 21/32"
3/8"
3VX3VX
35/64"
17/32"
13/32"
17/32"
8VX
D
E
D
20mm
C
EE
Pitch
DD
D5VPD
SPCP
CSPBPC CSPBPSPCPDSPBP
8V
8V CPHC ,
PowerBand – Hi-Power II, Super
CX1" 5/8"
1"
22mm
5/8"
35/64"
3VP 23/64"
3VP
23/64"
8V5VX
8VX
5VP
A
CX
5VX
8V
8V
3VX™
3VX
Metric
Power
V-Belts
AX Power
AX BX
AXV-Belts
Metric
BX BXCX CXCX
1/2"
3/8"
3VX 21/64"
**
29/32"
3/8"
29/32" 29/32"
37/64"
37/64"
23/64"
7/8”
29/32"
13/32”
5/16”
AX
1-1/2”
5/8"
1-1/2”
7/8"
3/8" 3/8"
5/8"
5/8"
23/64"
23/64"
7/8"
53/64"
1/2"
1/2" 1/2" 1"
C8VX 8VX
5VX
BC
AB 5/16"13/32"
B
5/16"
3/8"
5VX
3VP
1-1/4”
5/8"
5/8"
13/32”
3/8"
13/32"
35/64"
23/64" 7/8"
21/32" 21/64"
21/32" 21/32"
1-1/2”
1/2"
B 3V
5VX
B
3VX
5/8"
1/2"
A A5/16"
5/8" 5/16"
3/4”
1/2"
1/2"
1/2"
17/32”
5/16"
AP
3/8"
7/8"
17/32"
53/64" 3/8"
53/64"
53/64"
5V
3/8"
A 11/32"
37/64" 11/32"
1-1/4"
5VX 37/64" 1-1/4"5V
3V
7/8"
5/8"
3/8"
5/16"
A
23/64"
21/64"
1"
37/64" 37/64"
1" 37/64"
21/32"
5/8"
5/16”
*
8V8V
8V
5VP
3VP35/64”
23/64"
35/64"
1"1"
5VX7/8”
5VX5VX
3/8"
17/32"
5/8" 5/8"
13mm 1" 13mm
1”1" 1" 13mm
8V 5V
7/8"
53/64"
3/8"
35/64"
35/64"
7/8"
3/8"
3/8"
35/64"
35/64"
37/64"
21/64"
21/64"
5/8"
5/8"
5/8"
7/8"
17/32"
22mm
13/32" 13/32"
22mm
5/8"
3/8"
5/8"
5/8"
5VX3VX
3V II V-Belts
3V 3VX
3V
Hi-Power
3/8"
7/8"
7/8"
21/32"18mm
13/32"
5/16"
5/16"
5/8”
1" 1"
29/32" 29/32"
29/32"
1/2"
17/32"
13/32"
21/32"
21/32"
1/2"
13mm
1"
8V
5V
8V
8V
3VX
8V8V8V
8V
8V
8VX
5V
5VX
5V
5VX
Super
3V HC® V-Belts
5V
BP
3/8" 3/8"
5V 5V 5V
V-Belts
53/64"
53/64"
22mm
The information on the following pages
37/64"
37/64"
13mm will help identify
16mm 16mm 16mm
23/64"
23/64" Gates makes a belt to fit
the belt types used in
industry.
nearly any application.
3V it23/64"
Consequently,
is important to identify the
various types
5/8"
5/8" 1"
1” 5/8"
and sizes of belts available, and then quickly be able to
3/8"
3/8"replacement.
3/8"
specify the
correct
5/8"
37/64" 37/64"
5/8" 37/64"
5/8”
3/8” 3V 23/64"
3V 23/64"
3V 23/64" 1"
3/8”
7/8"
3/8"
3/8"
7/8”
3/8"
35/64”
35/64"
35/64"
21/64”
3V 21/64"
21/64”
3V
21/64"
1"
1"3V 29/32"
1"
5V
7/8"
35/64"
35/64"
5/16"
5/16"
16mm
53/64" 53/64"
When preventive maintenance inspections
indicate that
5/8"
belts need replacing,®it is important to install the correct
3/8"
belts.
Super HC V-Belts
5VX
5VX
16mm
1/2"
7/8”
35/64" 35/64"
3VX 21/64"
3VX 3VX
1/2"
3VX3VX
21/64"
21/64"
AP
1"
53/64"
8VX
8VX
21/32"
CP
CP CPCP 8mm
BP BP BP
AP AP AP
Pitch
8VP
SPBP
SPCP
SPCP
SPBP
5V
5V
3V 3V
Pow
SPCP
SPCP2mm
SPBPSPBP
SPBP SPCP
3/8" 3/8"
D
C
Pow
Molded Notch
17X
17X
PowerBandJoined
Belts
PowerBand
BeltsPo
Belts Belts 6mm
Hi-Power II V-Belts
13mm Multi-Speed
8mm
10mm
8mm
67_
69_ Multi-Speed
8mm
10mm
PowerGrip HTD6mm
Belts
68_
8mm
® 4LK SPA
® SPB
10X
13X®
SPZ
SPC 3mm
3LK
®13X
Truflex
& PoweRated
Light
10X
SPA 5LK
SPZ
SPC
SPB Duty V-Belts
5mm
18mm
®
1-1/2”
1-1/4”
7/8”
21/32”
1/2”
C
D
21/32”
Predator V-Belts ®
Tri-Power V-Belts 1/2”
7/8”
21/32”7/32’
35/64”
17/32”
13/32”
Timing
Pitch
20mm
B
Pitch
®
A
C
Poly Chain GT Carbon Belts
®
Multi-Speed Belts
Belts
Multi-Speed
1/8”
1/2”
1”
5/8”
7/8”
21/32”
5/16”
XPC
XPB E
XPC
XPB
Synchronous Belts
10mm
10mm
™
®
®
®
BELT
IDENTIFICATION
Truflex® Truflex
& PoweRated
& PoweRated
Light
V-Belts
Duty V-Belts
GT
®Light Duty
® ®2
3/8”
5/16”
3/8”
1/4”
1/2”
29/32”
3/4”
XPA
XPA
13/32”
®
®
Pitch
17/32”
XPZ
A
B
XPZ
Truflex®
Single
V-Belts
5/16”
®
13/32”
22mm
16mm
18mm
13mm
7/8”
17/32”
Predator
PowerBand Belts
PowerGrip Timing Belts
B
A
C
®
A
Truflex®14mm
Truflex®
8mm
®
®
Top Width-Sheave Angle Joined Hi-Power
PowerBand
Belts
II PowerBan
5/16”
3L
2LAX(0) Multi-Speed
4L
Belts
BX (1)
CX (2)
AP
BP
CP
5VP
8VP
5L (3)
SPBP
SPCP
PoweRated®
Metric Power™ V-Belts
21/32”
22mm
XL
7/32’
1/8”
3L2L
(1)(0) 4L
3L(2)
(1)
2L (0)
21/32”
3/8”
5/16”
5/16”
7/32’
L
3mm Pitch
5/8”
21/32”
1/2”
1/2”
MXL
3/8”
3/8”1/4”
GT®2 Belts
2mm Pitch1/8”
1”
1”
5/8”
Pitch
®
1/4”
PowerGrip
Super HC® V-Belts
3/8”
Pitch
3/8”
5L
4L(3)
(2)
A
5L (3)
®
®
Super
HC
&
Super
HC
Synchro-Power
Po
®
®
Predator
PowerBand
Belts
67_
69_
68_
Molded
Notch
Syn
Timing
®
®
3LK Truflex
5LK
4LK
®
®
& PoweRated
PoweRated
Light
Duty
V-Belts
®
Multi-Speed
Belts
67_
67_
69_
69_V-Belts
68_
68_Duty
Truflex
&
Light
PowerBand
®Belts
Tim
3LK
3LK
5LK
5LK
4LK
4LK
Truflex (Light Duty) V-Belts
Micro-V
Belts
Truflex®
Truflex® ®
PowerGrip Twin Power Belts
Super
HC & Super HC®
®Light Duty V-Belts
Truflex & PoweRated
Molded
Notch
PowerBand
Joined Belts Hi-Power
®
®® II PowerBand® Belts
PowerBand
PowerBand
JoinedJoined
Belts Belts
®
2L
3L
4L
5L
PowerBand
Belts
® (2)
3L (1)
(1)
5L (3)
(3)
2L (0)® PowerBand
4L
Predator
Belts 5L
3L
3/8”
35/64”
21/64”
13mm
10mm
3V
5V
3/8”
7/8”
1/2”
8V
53/64”
35/64”
16mm
21/64”
3VX
5VX
5mm** Pitch
8VX
®
H
17mm
13mm
8mm Pitch
10mm
18mm
PoweRated®
PoweRated®
3/8”
5/16”13mm
10mm
7/32’
8mmExample:
10mm Belt No. 2326V310 designates:
XH
8mm B
6mm
14mm Pitch
Top Width in 16ths of
an Inch: 23/16” = 1-7/16”
1-1/4”
A
B
®
C
D
E
20mm
21/32”
1/4”
®
1/4”
BX
CX
8mm
2L
(0)4L (2)
3L (1)
XPC
XPB
17X
XH
XXH
PoweRated®
Multi-Speed Belts
PoweRated®
®
PoweRated
V-Belts
PoweRated®
B
3/8”
68_
3/8”
A
1/2”
1/2”
&®
Super
HC®
®
3/8”
21/32”
21/32”
67_
69_
3LK
5LK
4LK
5/16”
®
®
Truflex & PoweRated 7/32’
Light Duty V-Belts 5/16”
®
PowerGrip® Twin Power® Belts
®
®
®
7/32’
2L (0)
3L (1)
A
A
®
3/8”
5/16”
7/32’
67_
3LK
A
21/32”
1/2”
3/8”
L SECTION
5L (3)
4L (2)
PoweRated®
®
M SECTION
Timing
J-
Polyflex and Polyflex
J Section 9/64”
J Section
®
A
®
A
J Section
Metric
J "SECTION
3/32
SuperHi-Power
HC & Super HCII PowerBand 3/32
Belts
"
Molded Notch
®
PowerBand Belts
®
®
®
®
A
*
*
LKSECTION
Section
Micro-V® Belts
Section
Hi-Power® II PowerBand® Belts
Micro-V® Belts
J Section
5/32”
3/32”
K* Section
L SECTION
®K
*
5/32”
3/32”
Section
L Section
L SECTION
3/16"
13/64”
9/64”
M Section
1/4”
3/16”
M Section
®
1/2”
3/8”
1/8”
1/8”
3/32”
3/32”
5M
1/8’
7M
5M
5M
3/32”
3M
11M
1/8’
7M
5M
1/8”
7/32”
9/32”
7/32”
7M
3/8"
11M
3/16”
11M
9/32”
®
®
9/32”
1/8’
1/2”
3/32”3/8”
3M
7/16”
7/16"
5M3M
5M
1/8’
9/32”
3/16”
7/32”
1/8’ 3/32”
1/8’
3/16”1/2”
1/8”
1/8”
7/16”
9/32”
5M
9/32”
7/32”
®
7/16”
7M
7M
11M7/32”
3M
9/32”
3/8”
7M
Round Belts
3M
Round Endless
3/32”
1/4”
7/16”
1/8”
Power Round™
Heavy-Duty
Construction
Round Endless
3M
5M
5/16”
1/2”
9/16”
7M
Power Round™
Heavy-Duty
Construction
Round
Belts®® Belts
Micro-V
Micro-V Belts
3/8”
9/16”
1/4”
7/16”
PM_Manual_Guts_2015.indd 21
5/16”
1/2”
9/16”
1/4”
®
5/16”
www.gates.com/drivedesign
1/4”
7/16”
7M
™
Heavy-Duty
Heavy-Duty
7/16”
Construction
Construction
1/2”
9/16”
11M
7/32”9/32”
™
5/32”
J Section
Section
5/32”
Round
Endless
J
3/32”
3/32”
™
5/16”
1/2”
9
11M11M
5M
Round Belts
11M
®
9/32”
9/32”
7/32”
RoundRound
Belts
®
® 9/32”Belts
7/32”
®
Hi-Power
Belts
5M
11M
1/8”7M ® II PowerBand
Hi-Power
II PowerBand
Belts
Round
Belts
Round Endless
Round
Endless
Power Round
Power Round
3/32”
1/2”
3/8”
11M
9/32”
7/32” 9/32”
7/32”
1/8”
1/2”
3/8"
®
Polyflex
JB V-Belts
7M
5M 11M
7M
11M
1/8”3/32”
3/32”
9/32”
7/32”
1/4”
3/16”
3/8”
7/16” 7/32”
3/8"
3/32”
3/8"
9/32”
7/32”
1/8”
3/32”
3M
7/32”
1/8’
3/32”
3M
7/16”
3/16”
9/32”
7/16”
M SECTION
9/32"
9/32”
3/16”
7/16” 9/32”
9/32”
3/16”
1/8”
3M
Section
1/4”
M SECTION
Molded
Notch
3/16” 3/16"
1/8"
Molded
Notch
9/32”
3/32”3/32” 1/8”
3/32”
1/8”
®7/32”
1/8’
®
PowerBand
Belts
3M
5M
3M
7M
5M
7M
11M
11M
Belts
3M PowerBand
5M
7M
11M
3M
5M
7M
3M
5M
7M
11M
3M
5M
3M
5M
7M
11M
®
Polyflex® and Polyflex® JB
9/32”
Polyflex® and Polyflex® JB®
1/8”
M SECTION
Section
®
® 3/16” ®
®
®
®
Polyflex1/8”
Polyflex
and Polyflex
and Polyflex
JB
JB
3/8”
7/32”
® "& Super
3/16
Polyflex
and
Polyflex
JB HC
Super
HC
HC®3M
M SECTION
Super
HC
& Super
Standard
Polyflex
V-Belts
L Section
L Section 3/16”
3/8"
1/4”
1/8”
®
3/16”
®
M - Section
1/4”
13/64”
9/64”
3/16
L" Section
3/16"
13/64”
9/64”
®
® 7/16”
9/32”
Polyflex
Polyflex
JB
1/2”
M
Sectionand
M
3/16”M
L Section
3M
Polyflex
and® Polyflex
JB
®
®
®
®
J Section
K
*
3/16”
13/64”
9/64”
Predator
PowerBand Belts
Belts
KPredator
PowerBand
3/32”
M Section
®
®
3/8"
5/32”
3/32”
Section 13/64”
M SECTIONL SECTION1/4”
9/64”
LL- Section
Section
Section
5/32”
3/32”
3/16"
5/32”
3/32”
PowerBand®® Joined
Belts®
K
A
M Sectio
®
L SECTION
Micro-V Micro-V
Belts Belts
BeltsHC®
SuperMicro-V
HC® & Super
Molded® Joined
Notch
PowerBand
® Belts
® Belts J SECTION
Micro-V
PowerBand
Belts
®
®
Section
Predator PowerBand
Belts
L Section
3/8"
3/16"
®
69_
5LK
68_
4LK
M SECTION
3/32"
A
GT®2
3/8”
5/16”
K* Sectio
3/16"
J SECTION
21/32”
1/2”
3/8”
L SECTION
Timing
Truflex®
1/8”
J Section
A
3/32"
®
Molded
Notch
MoldedTiming
Notch
3/8”
Molded Notch
3/8”
7/32’
®
PowerBand
PowerBand
Belts ® Belts
®
PowerBand
Belts
67_
69_
68_
J SECTION
67_
69_
68_
3L
4L
5L
J SECTION
®
PowerBand
Joined
Belts
5/32”
®
3/32"
3LK
5LK
4LK
®
®
®
®
J Section
3LK
5LKHi-Power
Micro-V
Belts
4LK
Hi-Power
II PowerBand
II PowerBand
Belts
3/32"
3/32” Belts
®
®
Synchro-Power
Polyurethane
Belts
Predator PowerBand
Belts
Hi-Power
II PowerBand
Belts AA Metric
BB
CC
DD
*
13/64”
K
Section
®
®
1/4”
M
J SECTION
® Belts
Dubl-V
Synchro-Power
Polyurethane Belts
Micro-V
Belts
®
Super HC
Super
& Super
HC &
HC
Super
HC
Super HC
Hi-Power
II PowerBand
Belts
5/16”
7/32’
3/32"
Metric
A
C
21/32”
1/2”
3/8”
J SECTION
A
A
®
®
®
4L (2)PredatorPredator
PowerBand
PowerBand
Belts ® Belts
10mm
8mm
5L (3)
13X
A
GT®2
H
17mm
3/8”
6mm
10X
SPC
SPB
XPA
XPZ
13mm
10mm
2LSPA
(0)
L
®
Timing
3/8”
3/8”
5/16”
XL
5/16”
13mm
5/16”10mm
18mm
7/32’
1/8”
MXL
21/32”
1/2”
22mm
3/8”
16mm
1/4”
13mm
SPZ
1/2”
1/2” PowerGrip® Timing Belts
7/32’
7/32’
1/8”
MetricTruflex®
Power™ V-Belts
1/8”
10mm
®
21/32”
21/32”
3/8”
3/8” ®
17/32”
13/32”
AX
C
A
7/8”
5/16”
B
Pitch
Tri-Power V-Belts
Nearest 10th Inch: 31.0”
A
5mm Pitch
®
1/2”
21/32”
3mm Pitch
Degrees
(26)
29/32”
3/4”
17/32”
13/32”
5/16”
1-1/2”
7/8”
21/32”
1/2”
21/32”
C
1/2”
10X 26V
17XA 1/2”
13X
3/8”
3/8”
310
XXH
®
®
B 5/16”
3/8”
3/8”
PowerGrip
HTD Belts5/16”
7/32’in
7/32’
Sheave
Angle
Multi-Speed
Pitch Circumference
to the
C
SPA
SPZ 23
SPC
SPB
XPA
XPZ® II V-Belts
XPC
XPB
Hi-Power
9/16”
21
Power Round
12/16/14 12:07 PM
5/8”
5VP
35/64”
1”
5VP 35/64”
8VP
8VP
7/8”
SPBP
SPCP
16mm
18mm
13mm
Pitch
SPBP2mmSPCP
18mm
8mm
Pitch
3mmSPCP
Pitch
5VP
8VP
SPBP
B
5VP
8VP
SPBP
SPCP
4mm
Pitch
BELT
IDENTIFICATION
5mm Pitch B
14mm
Pitch
8mm Pitch
7/8”
13mm
1”
1”
1”
53/64” 5/8”
5/8”
5/8”
**
Pitch
8mm
Pitch
14mm
®
®
B
C
A
PowerGrip
Pitch
Pitch®2 Belts
® GT
®14mm
A ®2 Belts
PowerGrip
GT
8mm
PowerGrip
GT
2 Belts
2mm
PitchPitch
Pitch
8mm
14mm
®
®
PowerGrip
GT
2mm
Pitch
PitchPitch
Pitch 2 Belts
2mm
C®
3mm Pitch
®
PowerGrip
GT®2 Belts
3mm
2mm
3mm**Pitch
Pitch
®
PowerGrip
GTC 2 Belts
5mm** Pitch
®
werGrip
HTD
Bel
Grip HTD Be
”
”
”
3/8”
3/8”
3/8”
1”
35/64”
35/64”
35/64”
21/64”
5/8”
8VX
21/64” Synchronous Belts 1”
3/8” 21/64”
®
53/64”
53/64”
53/64”
53/64”
1”
3VX All synchronous
5VX
8VX
5/8” 35/64”
belts are identified in a similar manner,
in
B
14mm
3VX
5VX
8VX
21/64”
either English
measured by:
3/8”
5/8” or metric units. Belts
3VX
5VX
8VXare Pitch
53/64”
35/64”
3/8”
1. Pitch: Distance
in inches or millimeters53/64”
between
3VX21/64” two adjacent
5VX tooth centers as8VX
measured on the
®
®
3mm
Pitch
2mm
Pitch
A5mm
5mm
Pitch
A
8mm
2mm Pitch
**
8mm
3mm
5mm
8mm
3mm
”
14mm
8mm
5mm Pitch
Pitch B
14mm
Pitch
C
B or millimeters.
3.
W
idth: Denoted
in inches
”
** Pitch
14mm
C
35/64”
A
5mm
Pitch
21/64” belt pitch line.
®
®
A
8mm Pitch
A
3VX
5VX
8VX
14mm
Pitch B
C
®
®
1-1/2”
Synchronous
Belts
8mm
Pitch
®
®
™
PowerGrip
HTD
Belts
3VX
5VX
8VX
Chain
GT Carbon PowerGrip
Belts
A ®
1-1/2”Belts
HTD Belts
PolyPoly
Chain GT
Carbon™
B ® HTD
PowerGrip
14mm
Pitch
C
®
® Belts
®
®
™ 1-1/2”
1-1/4”
Poly Chain GT Carbon Belts
®
®
PowerGrip
HTD
Belts
B
1-1/2”
1-1/4”
14mm Pitch
PowerGrip
HTD
Belts
C
A
®3mm
®Pitch
™
1-1/4”
Pitch
m
Poly
Chain
GT
Carbon
Belts
3mm
Pitch
B ®1-1/2” ®
®
29/32”
C™
A ® Belts
PowerGrip
HTD
3M
5M
14M
3mm
Pitch
Poly
Chain
GT
Carbon
Belts
1-1/4”
29/32”
®
®
™
3mm
Pitch
9/32”
5mm
Pitch
3/4”
3mm
5mm
14mm Pitch
32”
Pitch
Poly
Chain
GT
Carbon
Belts
29/32”
18mm
5mm
Pitch
A
Pitch
Pitch
®
®
3/4”
1-1/2” Pitch
32”
29/32”
8mm
14mm
3/4”
PowerGrip
HTD
Belts
5mm
Pitch
B
Pitch
32”
3mm
®
®
™
1-1/4”
Pitch
C
5mm
Pitch
EPitch DPoly
®
®
8mm
14mm
1-1/2”
Chain
GT
Carbon
Belts
20mm
B
8M
E 14M29/32”BC
PowerGrip
HTD Belts
20mm
1-1/4” 8mm
3/4”
32”
®
®
Pitch
14mm
Pitch
B
D
E
Pitch
Pitch
8mm PowerGrip GT 2 Belts
CP
™
5mm
Pitch B C
3mm
C
20mm
DPoly Chain®Pitch
EA ® Carbon
C
Pitch
GT
Belts
20mm
B
8mm
A
20M
29/32”
C
B
3mm
Pitch
Pitch
8M
Pitch
8mm3/4” B conductive
14mm
8mm 2mm PitchD
32”
C
Pitch
APoly Chain
20mm
Pitch
E
Also available in static
8mm
®
®
C
5mm
Pitch
A
20mm
29/32”
A
8mm
14mm
PowerGrip
GT
2
Belts
B
3mm
Pitch
Pitch
Pitch
3/4”
Pitch
Carbon Volt™ construction
32”
A
8mm
14mm
5mm
Pitch B
C
Pitch
C
Pitch
B
Pitch
Pitch
8mm
A
A
C
D Pitch
E
5mm Pitch
20mm
Pitch®
PowerGrip
3 Belts
2mm GT
Pitch
PowerGrip Timing
®14mm
B Belts
EA 2 Belts®
8mm
A
C
®
GT
Pitch
8mm 8mm PitchDPowerGrip
20mm
®PowerGrip
®
PowerGrip
Timing
Belts
Timing
Belts
B
®
17/32”
PowerGrip
GT
Pitch
Pitch®2 Belts
Pitch
A
® Timing Belts C
3mm
Pitch ®14mm
PowerGrip
14mm Pitch2M
8mm
17/32”
PowerGrip
GT
2
Belts
*
MXL
PowerGrip
Timing
Belts
*
A
2mm
Pitch
17/32”
2mm
53/64”
.080"
Pitch
Pitch
Pitch
MXL
®
2mm
Pitch
**
A
Pitch
®
PowerGrip
Timing
Belts
5mm
Pitch ®MXL
MXL
PowerGrip
GT
2
Belts
17/32”
2mm
Pitch
®
®
MXL
3mm
Pitch
PowerGrip
HTD
Belts
XL*
3M
®
* PitchPitch ®XLGT®2 Belts
3mm
4”
XL
8mm
PowerGrip
Timing Belts
PowerGrip
3mm
XL
MXL
3mm Pitch 3mm
17/32”
2mm
Pitch
**
.200"
Pitch
XL
®
4”
Pitch
®
5mm** Pitch B
PowerGrip
Timing Belts
L
4”17/32”
5mm Pitch 5mm Pitch
L
**
2mm
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belt construction
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www.gates.com/drivedesign
C PowerGrip
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2. P
itch Length:
Total length (circumference) in inches or
Pitch
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as measured along the pitch line. It is equal
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owerGrip Timing Belts
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PM_Manual_Guts_2015.indd 22
A
®
®
®
Timing
GT®2
Timing
A
A
A
12/16/14 12:07 PM
18mm
8mm 3/8”
X 1-1/4”
13mm
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ts
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Predator PowerBand Belts
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LK Super HC® & Super
HC®
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ts
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werBand
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and Polyflex® JB®
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yflex® JB®
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erBand® Belts
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Duty
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PowerGrip Twin Power
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er
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Band Belts
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Duty
® V-Belts
® ® & PoweRated
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ts
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™
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17X L.375” Pitch
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14mm Pitch
Tri-Power V-Belts
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8mm Pitch
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A
C
C
PowerGrip HTD Belts
L 20mm
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53/64”
29/32”
XL
.200” Pitch
B
Pitch
Pitch ®
Pitch
1-1/2”35/64”
21/64”
®
Hi-Power
II V-Belts
C ® Light
D V-Belts
Rated
Duty
1/2”
14mm
Pitch
Pitch
3/4”
17mm
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17/32”
XXH
XXHPitch
B
3mm
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3mm
BELT IDENTIFICATION
3/8”
35/64”
21/64”
C
A
14mm
PowerGrip GT®2 Belts
1”
5/8”
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XL
SPCP
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elts
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18mm
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s
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®
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HTD® Belts
53/64” 10mm
22mm
16mm
7M
11M
PM_Manual_Guts_2015.indd 23
J Section
5/32”
3/32”
23
www.gates.com/drivedesign
Synchro-Power
Polyureth
Metric
A
®
A
®
12/16/14 12:07 PM
BELT IDENTIFICATION
Synchro-Power® Polyurethane Belts
T5
5mm Pitch
T10
10mm Pitch
T20
20mm Pitch
Pitch
AT5
5mm Pitch
AT10
10mm Pitch
AT20
20mm Pitch
Pitch
5M
HTD
5mm Pitch
8M
HTD
8mm Pitch
14M
HTD
14mm Pitch
Pitch
24
PM_Manual_Guts_2015.indd 24
®
®
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BELT TYPES
Narrow Section V-Belts
These high capacity belts are used to substantially reduce
drive costs and decrease space requirements. This
V-belt handles the complete range of drive horsepower
recommended with three narrow cross sections instead of
the five regular cross sections needed for classical heavyduty belts. Specified by 3V, 5V or 8V cross sections. Specify
Gates Super HC® V-belts.
Classical Section V-Belts
These are the original belts used in heavy duty
applications. They are specified by cross section and
standard length. The size is designated as A, B, C, D or E.
The easiest way to select a replacement is by finding the
belt number on the worn belt. If not legible, measure the
belts outside circumference with a flexible tape, preferably
while it is still on the drive.
Then, order the Gates Hi-Power® ll V-belt which has the next
shorter standard length. For example: For an “A” section
belt with a 28.0” O.C., order an A26 replacement belt.
Banded and Bandless Belts
Banded belts, also called wrapped or covered belts, have
a fabric cover. Un-notched and generally with concave
sidewalls, banded belts have rounded bottom corners and
arched tops.
Bandless belts have no fabric cover, straight cut-edge
sidewalls, and special molded notches. The notches
reduce bending stress which allows belts to run on smaller
diameter sheaves than comparable non-notched banded
belts.
Gates offers these two types in both the classical and
narrow sections. In the classical section, Gates TriPower® molded notch is available in AX, BX and CX cross
sections. Its length is specified by the same standard belt
number as other classical section belts.
Note: The revolutionary Gates belt construction is used in
the notched belts.
Gates also offers Super HC® Molded Notch V-belts in 3VX,
5VX and 8VX sizes.
In both cases, an “X” is used in the belt number to
designate a molded notch construction. For example: An
AX26 is a bandless, molded notch classical section belt. A
5VX1400 is a narrow section, bandless, molded notch belt
with a 140” O.C.
®
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®
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12/16/14 12:07 PM
BELT TYPES
Light Duty Belts
These are used on light duty fractional horsepower drives
and are designed for use with backside idlers. Gates
Truflex® and PoweRated® V-belts are offered in this
category and are specified by cross section and outside
circumference. Truflex® is recommended for the lower
lighter duty range. PoweRated®, a special belt designed
for clutching, heavier shock-load and backside idler
drives, is recognized by its green color. Reinforced with an
aramid fiber tensile (pound for pound stronger than steel).
PoweRated® can interchange with Truflex®, but Truflex®
cannot interchange with PoweRated®.
Synchronous Belts
These belts are also known as timing or positive drive
belts and are used where driveN shaft speeds must be
synchronized to the rotation of the driveR shafts. They can
also be used to eliminate noise and maintenance problems
caused by chain drives.
Synchronous belts, such as Gates Poly Chain® GT®
Carbon™, can be used in high horsepower drives, drives
where space is severely limited and where there is limited
take up.
Synchronous drives are extremely efficient – as much as
98% with properly maintained Poly Chain® GT® Carbon™
or PowerGrip® GT®3 systems. By contrast, chain drives
are in the 91-98% efficiency range, while V-belts average in
the 93-98% range.
Distinctive tooth profiles (shapes) identify synchronous
belts. Various sizes and constructions are available to
meet a wide range of applications. The three important
dimensions of a synchronous belt are pitch, width and pitch
length. Tooth profiles must also be identified.
Belt Pitch - Distance in inches or millimeters between two
adjacent tooth centers as measured on the belt’s pitch line.
Belt Pitch Length - Circumference in inches or
millimeters as measured along the pitch line.
Number of Sprocket Grooves
Width - Face width.
Note: The sprocket’s pitch diameter is always greater than
its outside diameter.
Note: PowerGrip® GT®3 belts must be used with
PowerGrip® GT®2 sprockets for new designs.
Note: 8 and 14 mm pitch PowerGrip® GT®3 belts can be
used as replacement belts for competitive curvilinear tooth
profiles. See page 32.
Example: 14mm-170mm width – substitute a PowerGrip®
GT®3-14mm-115 without any performance loss. Refer to
page 32 for crossover information.
Width - Top width in inches or millimeters.
Tooth Profile - See the Belt Identification section for the
easiest way to identify tooth profile.
Synchronous belts run on sprockets, which are specified by
the following:
Pitch - Distance between groove centers, measured on the
sprocket pitch circle. The pitch circle coincides with the
pitch line of the mating belt.
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PM_Manual_Guts_2015.indd 26
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®
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BELT TYPES
Polyflex® JB® V-Belts
Polyflex® is a unique belt with a distinctive 60° belt angle
and ribbed top specifically designed for long life in small
diameter sheave drives. Polyflex® JB® is ideal for compact
drives, drives with high speed ratios, and drives requiring
especially smooth operation.
The “JB” refers to the belt’s configuration: two, three or five
belts joined together to provide extra stability and improved
performance. This joined belt style should be used instead
of matched single belts whenever possible.
Polyflex® JB® belts are ideal for these applications:
• Milling, grinding or drilling machines
• Lathes
• Machine spindle drives
• Centrifuges
• Blowers
• High speed compressors
Polyflex® JB® belts are specified by Top Width and
Effective Length
Multi-Speed Belts
(Variable Speed Drives)
Multi-Speed belts have a distinct shape. Multi-Speed belt
top widths are usually greater than their thicknesses. This
permits a greater range of speed ratios than standard
belts. Usually cogged or notched on the underside,
Multi-Speed belts are specified for equipment which
require changes in driveN speed during operation.
Multi-Speed belts are specified by Top Width, Outside
Circumference, and the required Groove Angle. The
groove angle can be measured from the drive pulleys.
Micro-V® or V-Ribbed Belts
Gates Micro-V® belts outperform other V-ribbed belts
because the tips of the “V” are truncated (shorter). This
shorter profile gives the new Micro-V belts increased
flexibility, reduced heat buildup and allows them to operate
at extra high speeds on smaller diameter sheaves.
Additional advantages of the truncated tips are: (1) the belt
does not bottom in the sheave, therefore providing a higher
degree of wedging and (2) the belt can better tolerate debris
in the sheave groove. They are extremely smooth running and
highly resistant to oil, heat and other adverse conditions.
Three cross sections are available for industrial applications:
J, L and M.
®
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12/16/14 12:07 PM
BELT STYLES
Spliced and Linked Belting
Used on drives with little or no take-up, or as an
emergency belt replacement.
Belting is sold on reels in standard V-belt cross sections.
Easy-Splice V-belting ends are spliced with fasteners that
require special assembly tools. Always use the correct
fasteners with the correct belt type and cross section.
Nu-T-Link®, a high performance, linked belt, is also
available for use as emergency belting, and for drives
where conditions are detrimental to rubber belts.
PowerBand® Belts
PowerBand belts were developed by Gates for drives
subjected to pulsating loads, shock loads or extreme
vibrations where single belts could flip over on the pulleys.
A high-strength tie band permanently joins two or more
belts to provide lateral rigidity. This keeps the belts running
in a straight line in the pulley grooves. PowerBand®
construction is offered with Gates Hi-Power® II, Super HC®
and Super HC® Molded Notch Belts.
Predator® V-Belts
Gates Predator® V-belts are available in single, or multilayered PowerBand® construction that adds strength,
durability, shear and tear resistance and lateral rigidity to
handle the toughest shock-loaded applications.
28
PM_Manual_Guts_2015.indd 28
®
®
Primary features of Predator® V-belts:
• Aramid tensile cords for extraordinary strength, durability
and virtually zero stretch.
• Chloroprene rubber compounds for superb oil and heat
resistance.
• Specially-treated extra tough cover withstands slip
and shear forces at peak loads without generating
excessive heat. It also fends off penetration by foreign
materials.
• Gates curves that compensate for effects that occur
when belts bend around a sheave for uniform loading
and maximum life.
• Matched by request to maximize power absorption and
belt life.
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12/16/14 12:07 PM
BELT STYLES
Round Endless Belts
Recommended for replacing leather belting on serpentine
or quarter-turn drives. They are specified by Diameter and
Inside Length.
If your current drive has leather or round endless belting,
you should consider a new drive design. V-belt drives offer
many advantages in performance, even on serpentine or
quarter-turn drives.
Also available in Heavy-Duty PowerRound®
construction
PowerBack® V-Belts
PowerBack® belts are “B” section V-belts with a flat back
surface. The flat back surface makes PowerBack® belts
ideal for driving roll-to-roll conveyor applications.
Power Curve® V-Belts
Power Curve® belts are “B” section V-belts offering
increased flexibility for demanding power turn conveyor
applications. The belts “bend” around corners and drive
the rollers in most conveyor applications.
®
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12/16/14 12:07 PM
BELT STYLES
Dubl-V Belts
A special version of Gates Hi-Power® II for serpentine
drives where power is transmitted by both the top and
bottom of the belt. Dubl-V belts are specified by A, B, C or
D cross sections, and by Effective Length.
Static Conductive Belts
Static discharge can pose a hazard on belt drives that
operate in potentially explosive environments. Static
discharge can also interfere with radios, electronic
instruments, or controls used in a facility. While
uncommon, static discharge can also cause bearing
pitting if the discharge occurs through the bearing. Static
conductivity is a required belt characteristic in these cases
in order to prevent static discharge.
V-belts are generally manufactured to be static conductive
in accordance with the ARPM (Association for Rubber
Products Manufacturers - Formerly RMA) IP 3-3 bulletin,
but it is important to confirm with the belt manufacturer
that a specific belt product or product line is static
conductive.
Gates Hi-Power® II, Tri-Power®, Super HC®, Super HC®
Molded Notch, Metric Power™, Micro-V®, Truflex® V-belts
are all static conductive when new as defined by ARPM
Bulletin IP 3-3. 8m, 14m Poly Chain® Carbon™ Volt® and
8m, 14m PowerGrip® GT3® belts are conductive as defined
by ISO 9563.
PowerGrip GT 2* in 2mm, 3mm, 5mm pitches,
PowerGrip® Timing, Poly Chain® GT®, Poly Chain® GT®2, Poly
Chain® GT® Carbon™, Polyflex®, Polyflex® JB®, PoweRated®,
and Predator® belts are not considered to be static
conductive.
®
®
PowerGrip® GT®3* in 2mm, 3mm, 5mm pitches and
PowerGrip® Timing belts can be manufactured in a static
conductive construction on a made-to-order basis.
When a belt is used in a hazardous environment, additional
protection must be employed to assure that there are no
accidental static spark discharges. The portion of the belt
that contacts the sheave or sprocket must be conductive
to ensure that static charge is conducted into the drive
hardware. V-belts must have a static conductive sidewall in
contact with a conductive sheave. Synchronous belts must
have a static conductive tooth surface in contact with a
conductive sprocket.
Unusual or excessive debris or contaminant on the belt
contact surface or sheave or sprocket grooves should
be cleaned and removed. Banded V-belts (V-belts with a
fabric bandply on the driving surface) should be inspected
for bandply wear. If the fabric bandply on the belt sidewall
has worn away, the belts should be replaced immediately.
Bandless V-belts do not have to be replaced if wear is
evident on the belt sidewall. If there is any question about
the belt’s physical condition and its static conductivity
characteristics, replace the belt.
Any belt drive system, whether it uses a synchronous
belt or V-belt, that operates in a potentially hazardous
environment must be properly grounded. A continuous
conductive path to ground is necessary to bleed off the
static charge. This path includes a static conductive belt,
a conductive sheave or sprocket, a conductive bushing, a
conductive shaft, conductive bearings, and the ground. As
an additional measure of protection, a static-conductive
brush or similar device should be employed to bleed off
any residual static buildup that might remain around
the belt.
* NOTE: 8mm pitch PGGT2 and PGGT3 belts at 12mm wide are NOT static conductive.
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BELT DRIVE PERFORMANCE
To provide proper maintenance, you must understand
the nature of the belt drives in your plant. You know the
expected belt service life on each drive, and you are aware
of the capabilities and limitations of this equipment.
On occasion, however, it is necessary to give some thought
to belt service life, especially when belt service life is below
the expected performance level and the situation must be
improved.
Upgrade Drive Performance
A belt drive can sometimes be upgraded to improve
performance. The first step is to see if simple
improvements can be made at minimal costs. This involves
checking the drive design for adequate capacity using
the appropriate drive design manual or Gates Design
Flex® Pro™ drive design software.
If further improvement is needed, the next step is to
upgrade the drive to a higher performance belt system.
Here are examples of minor changes that could improve
performance.
• Increase sheave or sprocket diameters
• Increase the number of belts, or use wider belt
• Add vibration dampening to system
• Improve guard ventilation to reduce operating
temperature
• Use at least the correct, minimum recommended
pulley diameters on inside and backside idlers
• Use premium belts rather than general purpose types
• Replace sheaves or sprockets when they are worn
• Keep sheaves or sprockets properly aligned
• Place idler on span with lowest tension
• Re-tension newly installed belts after a 4 to 24 hour
run-in period
• Review proper belt installation and maintenance
procedures
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Gates Corporation is the recognized industry leader in
product innovation and belt drive technology. New products
and applications are continually made available to Gates
customers. Here are examples of advanced Gates belt
innovations.
Advanced Gates Belt Drive Products & Solutions
• Poly Chain® GT® Carbon™ positive drive
(synchronous) belts
• Poly Chain® GT® Carbon™ Volt® positive drive
(synchronous) belts
• PowerGrip® GT®3
• Polyflex® JB® belts
• PoweRated® light-duty V-Belts
• Super HC® Molded Notch V-Belts
• Super HC® XP™ (Notched Premium) V-Belts
• Predator® Single & PowerBand® belts
• Power Curve® V-Belts
• PowerBack® V-Belts
• Stainless steel sprockets & bushings (stock)
• Gates Design Flex® Pro™ Software
• Gates Design Flex® Mobile Online
• Gates Design IQ™ Software
Your local Gates distributor or representative can work
with you to upgrade your existing drives and reduce your
maintenance and down time costs.
Or, you may have a problem or excessive maintenance
costs with a non-belt drive, such as gear or chain. Again,
your local Gates distributor or representative can offer you
excellent advice as to whether or not a belt drive could
solve the problem and reduce your maintenance costs.
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BELT DRIVE PERFORMANCE
In most cases, synchonous belt drives that are using non-Gates curvilinear belts can be changed to a Gates PowerGrip®
GT®3 belt to reduce width. Use the table below to identify product types that can be converted, and what widths are
recommended.
PowerGrip® GT®3 – 8 & 14mm belts can be used to replace other non-Gates curvilinear belts in the
next smallest width.
Company
Product Trade Name
BandoSyncro-Link® – HT
Dodge
HT100
GatesHTD®
Profile
Nomenclature
Belt-Pitch
H†
1600-8M-20-H
8 & 14MM
GT
1600-8M-20
8 & 14MM
HTD1600-8M-20
8 & 14MM
JasonHTB®H†
1600-8M-20
8 & 14MM
BrowningHPT®
RPP
1600-14M-20
8* & 14MM
Goodyear
RPP
1600-14M-20
8* & 14MM
1600-14M-20
Dayco/CarlisleRPP®/RPP Plus®RPP
8* & 14MM
Dodge
T.B. Wood’s
Competitors’ Width
HPPD™
HT150
GT
1600-14M-20
8 & 14MM
RPP®/RPP Plus®
RPP
1600-14M-20
8* & 14MM
PowerGrip GT3 – Width
Competitors’ Width
PowerGrip GT3 – Width
8MM – Pitch
20
30
50
8MM – Pitch
20
20
30
14MM – Pitch
40
55
85
14MM – Pitch
40
40
55
85
50
115
85
* Replacement only on sprockets with fewer than 50 grooves
†
See Association of Rubber Products Manufacturers bulletin IP-27 (1997) for H type tooth profile specification information
For example, a competitor’s belt in 14mm pitch, 85mm wide, can be replaced with a narrower 55mm Gates PowerGrip®
GT®3 belt.
Reference www.gates.com/interchange for electronic interchange information.
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NOISE
V-belt, synchronous belt, roller chain, and gear drives will
all generate noise while transmitting power. Each type of
system has its own characteristic sound. V-belt drives tend
to be the quietest belt drives, and synchronous belt drives
are much quieter than roller chain drives. When noise is an
issue, there are several design and maintenance tips that
should be followed to achieve the quietest possible belt
drive.
For comparison, some typical noise levels and their
sources are listed below.
Normal Speech
60 dBA
Busy Office
80 dBA
Textile Weaving Plant
90 dBA
Canning Plant
100 dBA
Noise is an unwanted or unpleasant sound that can be
described with two criteria – frequency and decibel (dBA)
levels. Frequency is measured in Hertz.
The human ear is capable of distinguishing frequencies
typically from 20 to 20,000 Hertz. The human ear
generally does not perceive frequencies higher than 20,000
Hertz.
Heavy City Traffic
100 dBA
Punch Press
110 dBA
Air Raid Siren
130 dBA
Jet Engine
160 dBA
The noise level or intensity of noise is measured in terms
of decibels (dBA). The decibel has become the basic unit
of measure since it is an objective measurement that
approximately corresponds to the subjective measurement
made by the human ear. Since sound is composed of
several distinct and measurable parts and the human
ear doesn’t differentiate between these parts, measuring
scales that approximate the human ear’s reaction have
been adopted. Three scales – A, B, and C are used to
duplicate the ear’s response over the scale’s ranges. The
A scale is most commonly used in industry because of its
adoption as the standard in OSHA regulations.
Following proper installation and maintenance procedures,
as well as some simple design alternatives can reduce belt
drive noise.
Noise: Decibel and Frequency
Noise described in decibels (dBA) is generally perceived as
the loudness or intensity of the noise.
While the human ear can distinguish frequencies from 20
to 20,000 Hertz, the ear is most sensitive in the range of
normal speech – 500 to 2000 Hertz. As a consequence,
this range is the most common concern for noise control.
Frequency is most closely related to what the ear hears
as pitch. High frequency sounds are perceived as whining
or piercing, while low frequency sounds are perceived as
rumbling.
The combination of decibel and frequency describes the
overall level of loudness to the human ear. One without the
other does not adequately describe the loudness potential
of the noise. For example, an 85 dBA noise at 3000 Hertz is
going to be perceived as much louder than an 85 dBA noise
at 500 Hertz.
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Reducing Noise
Belt Drive Tension and Alignment
Properly tensioning and aligning a belt drive will allow the
belt drive to perform at its quietest level.
Improperly tensioned V-belt drives can slip and squeal.
Improper tension in synchronous belt drives can affect
how the belt fits in the sprocket grooves. Proper tension
minimizes tooth to groove interference, and thereby
reduces belt noise. Check to make sure that the drive is
properly tensioned by using Gates tension measurement
gauges.
Misaligned V-belt drives will be noisier than properly
aligned drives since interference is created at the belt’s
entry point into the sheave. Misaligned synchronous belt
drives tend to be much noisier than properly aligned
drives due to the even greater amount of interference
that is created between the belt teeth and the sprocket
grooves. Misaligned synchronous belt drives may cause
belt tracking that forces the edge of the belt to ride
hard against a sprocket flange. Misalignment causing
belt contact with a flange will generate noise that is
easily detected. Follow the guidelines discussed in
the installation section of this manual for checking and
correcting alignment.
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NOISE
Noise Barriers and Absorbers
Sometimes, even properly aligned and tensioned belt
drives may be too noisy for a work environment. When this
occurs, steps can be taken to modify the drive guard to
reduce the noise level.
Noise barriers are used to block and reflect noise. Noise
barriers do not absorb or deaden the noise; they block
the noise and generally reflect most of the noise back
towards its point of origin. Good noise barriers are dense,
and should not vibrate. A sheet metal belt guard is a noise
barrier. The more complete the enclosure is, the more
effective it is as a noise barrier. Noise barrier belt guards
can be as sophisticated as a completely enclosed case, or
as simple as sheet metal covering the front of the guard to
prevent direct sound transmission.
Noise absorbers are used to reduce noise reflections and
to dissipate noise energy. Noise absorbers should be used
in combination with a noise barrier. Noise absorbers are
commonly referred to as acoustic insulation. Acoustic
insulation (the noise absorber) is used inside of belt guards
(the noise barrier) where necessary. A large variety of
acoustic insulation manufacturers are available to provide
different products for the appropriate situation.
A combination of noise barrier (solid belt guard) and noise
absorber (acoustic insulation) will provide the largest
reduction in belt drive noise. While the noise reduction
cannot be predicted, field experience has shown that noise
levels have been reduced by 10 to 20 dBA when using
complete belt guards with acoustic insulation.
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SPROCKET CORROSION PREVENTION
Poly Chain® GT® Carbon™ belt drives are excellent
replacements for roller chain drives. Poly Chain® GT®
Carbon™ belt drives offer significant maintenance savings
and performance advantages over roller chain drives
on applications that operate in corrosive environments.
Synchronous belt drives also provide energy savings
compared to V-belt drives. Some of these applications may
also operate in corrosive environments.
Corrosive Environments
Many applications in the food and beverage industry are
located in areas that require periodic wash down. Unless
a drive is completely shielded and protected from wash
down, rust and corrosion will be rapidly apparent in these
types of environments.
Applications that are located in environments that have
high humidity or moisture content will also develop
sprocket and bushing corrosion. Examples of these types
of environments are pulp processing applications and
cooling tower applications that pass moist air over the belt
drive.
Effects of Corrosion
Corrosion will attack the sprocket grooves, building up rust
deposits. The corrosion will increase over time, building up
in the sprocket grooves and non-driving surfaces (flanges,
sprocket faces, bushing face).
Sprockets with corrosion in the grooves will rapidly wear
the belt’s teeth. Sprockets with corroded grooves will wear
through the abrasion resistant tooth fabric, resulting in
tooth shear and premature belt failure.
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SPROCKET CORROSION PREVENTION
Preventing Corrosion
Sprocket corrosion can be prevented by using Gates
stainless steel Poly Chain® GT®2 sprockets and bushings.
Sprockets can also be electroless nickel plated. Both
solutions will eliminate corrosion as a cause of failure on
belt drives located in these damaging environments.
The sprocket shown below has been electroless nickel
plated. Compare the grooves to the unprotected corroded
sprocket shown on page 35.
The photo below illustrates the difference in wear between
belts running on properly plated sprockets and those
running on corroded sprockets. The wear on the belt
running on corroded sprockets is severe and will result in a
greatly shortened belt life.
Belt ran on properly plated or stainless steel sprockets
Belt ran on corroded sprockets
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TROUBLESHOOTING GUIDE
When troubleshooting a drive problem, the goal is to
identify the cause(s), then take appropriate corrective
action. The following steps should be followed to help with
this process.
1. Describe the drive problem as accurately as
possible. Use Step 1 as a guide. Use this step as a
guide in the troubleshooting process.
2. Go through the list of “Drive Symptoms”. Check
those symptoms that are observed and record
them, as well as observations of anything unusual
about the drive.
3. Go through the “Problem/Solution Summary Table”.
List the probable cause(s) and corrective action.
Also, review the list of observations.
4. After identifying probable causes and corrective
action, review and implement.
What to Do When All Else Fails
If the problem still exists after all troubleshooting efforts
have been exhausted, contact the local Gates distributor.
If the local distributor cannot solve the problem, a qualified
Gates representative can be contacted. Save the failed
belt(s) for further inspection.
Gates Power Transmission Product Application engineers
are also available at ptpasupport@gates.com or (303) 7445800 to answer additional drive design and troubleshooting
questions.
Step 1
Describe the problem
• What is wrong?
• When did it happen?
• How often does it happen?
• What is the drive application?
• Have the machine operations or output changed?
• What kind of belt(s) are being used?
•W
hat are the expectations for belt performance in this
application?
Step 2
Identify symptoms and record
observations of anything unusual.
V-Belt Drive Symptoms
Check List
(Check those that are observed)
• Premature Belt Failure
 Broken belt(s)
 Belt(s) fail to carry load (slip). No visible reason
 Edge cord failure
 Belt delamination or undercord separation
• Severe or Abnormal Belt Wear
 Wear on belt top surface
 Wear on top corners of belt
 Wear on belt sidewall
 Wear on belt bottom corners
 Wear on bottom surface of belt
 Undercord cracking
 Burn or hardening on bottom or sidewall
 Belt surface flaking, sticky or swollen
 Belt stretch
 Extensive hardening of belt exterior
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TROUBLESHOOTING GUIDE
V-Belt Drive Symptoms Checklist–cont.
Synchronous Drive Symptoms Checklist
• Problems with PowerBand Belts
• Belt Problems
®
 Tie-band separation
 Unusual noise
 Top of tie-band frayed, worn or damaged
 Tension loss
 Band comes off drive
 Excessive belt edge wear
 One or more ribs run outside of pulley
 Tensile break
 Cracking
• V-Belt Turns Over or Jumps
off Sheave
 Premature tooth wear
 Tooth shear
 Single belt
 Belt ratcheting
 One or more belts in a set
 Land area worn
 Joined or banded belts
• Sprocket Problems
• Problems with Belt Take-Up
 Flange failure
 Single belt
 Unusual wear
 Multiple belts stretch unequally
 Rusted or corroded
 All belts stretch equally
 Belts do not match
• Performance Problems
 Incorrect driveN speeds
• V-Belt Noise
 Belt tracking problems
 Squeal or “chirp”
 Slapping noise
 Excessive temperature: bearings, housings,
shafts, etc.
 Rubbing sound
 Shafts out of sync
 Grinding
 Vibration
 Unusually loud drive
• Unusual Vibration
 Belts flopping
 Excessive vibration in drive system
• Problem With Sheaves
 Broken or damaged
 Severe, rapid groove wear
• Problems With Drive
Components
 Bent or broken shafts
 Hot bearings
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PROBLEM/SOLUTION SUMMARY TABLE
V-Belt Drive Symptoms
Premature Belt Failure
Symptoms
Broken belt(s)
Probable Cause
Corrective Action
1. Under-designed drive
2. Belt rolled or pried onto sheave
1. Redesign, using Gates manual.
2. Use drive take-up when installing.
3. Object falling into drive
3. Provide adequate guard or drive
protection.
4. Redesign to accommodate shock
load.
4. Severe shock load
Belts fail to carry load, no
visible reason
1. Underdesigned drive
2. Damaged tensile member
3. Worn sheave grooves
4. Center distance movement
1. Redesign, using Gates manual.
2. Follow correct installation
procedure.
3. Check for groove wear; replace as
needed.
4. Check drive for center distance
movement during operation.
Edge cord failure
1. Pulley misalignment
2. Damaged tensile member
1. Check alignment and correct.
2. Follow correct installation
procedure.
Belt de-lamination or undercord
separation
1. Too small sheaves
1. Check drive design, replace with
larger sheaves.
2. Increase backside idler to
acceptable diameter.
2. Use of too small backside idler
NOTE: Belt Failure Analysis poster #12975 available. Contact your Gates Representative.
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PROBLEM/SOLUTION SUMMARY TABLE
Severe or Abnormal V-Belt Wear
Symptoms
Probable Cause
Corrective Action
Wear on top surface of belt
1. Rubbing against guard
2. Idler malfunction
1. Replace or repair guard.
2. Replace idler.
Wear on top corner of belt
1. Belt-to-sheave fit incorrect (belt
too small for groove)
1. Use correct belt-to-sheave
combination.
1. Belt slip
2. Misalignment
3. Worn sheaves
4. Incorrect belt
1. Retention until slipping stops.
2. Realign sheaves.
3. Replace sheaves.
4. Replace with correct belt size.
1. Belt-to-sheave fit incorrect
1. Use correct belt-to-sheave
combination.
2. Worn sheaves
2. Replace sheaves.
1. Belt bottoming on sheave groove
2. Worn sheaves
3. Debris in sheaves
1. Use correct belt/sheave match.
2. Replace sheaves.
3. Clean sheaves.
1. Sheave diameter too small
2. Belt slip
3. Backside idler too small
1. Use larger diameter sheaves.
2. Retention.
3. Use larger diameter backside
idler.
4. Don’t coil belt too tightly, kink
or bend. Avoid heat and direct
sunlight.
Wear on belt sidewalls
Wear on bottom corner of belt
Wear on bottom surface of belt
Undercord cracking
4. Improper storage
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PROBLEM/SOLUTION SUMMARY TABLE
Severe or Abnormal V-Belt Wear–cont.
Probable Cause
Corrective Action
Undercord or sidewall burn or
hardening
1. Belt slipping
2. Worn sheaves
3. Underdesigned drive
4. Shaft movement
1. Retension until slipping stops.
2. Replace sheaves.
3. Refer to Gates drive manual.
4. Check for center distance
changes.
Belt surface hard or stiff
1. Hot drive environment
1. Improve ventilation to drive.
Belt surface flaking, sticky or
swollen
1. Oil or chemical contamination
1. Do not use belt dressing.
Eliminate sources of oil, grease
or chemical contamination.
Symptoms
Problems With PowerBand® Belts
Symptoms
Probable Cause
Corrective Action
Tie band separation
1. Worn sheaves
2. Improper groove spacing
1. Replace sheaves.
2. Use standard groove sheaves.
Top of tie band frayed or worn
1. Interference with guard
2. Backside idler malfunction or
damaged
1. Check guard.
2. Replace or repair backside idler
PowerBand® belt comes off drive
repeatedly
1. Debris in sheaves
1. Clean grooves. Use single belts to
prevent debris from being trapped
in grooves.
2. Realign drive.
2. Misalignment
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PROBLEM/SOLUTION SUMMARY TABLE
Problems With PowerBand® Belts–cont.
Symptoms
One or more “ribs” runs out of
pulley
Probable Cause
Corrective Action
1. Misalignment
2. Undertensioned
1. Realign drive.
2. Retension.
V-Belts Turn Over or Come Off Drive
Symptoms
Involves single or multiple belts
Probable Cause
Corrective Action
1. Shock loading or vibration
1. Check drive design. Use Gates
PowerBand® belts or Power
Cable® belts.
2. Shield grooves and drive.
3. Realign the sheaves.
4. Replace sheaves.
5. Use correct installation and belt
storage procedure.
6. Carefully align flat idler on slack
side of drive as close as possible
to driveR sheaves.
7. Replace with Gates matched
belts. Do not mix old and new
belts.
8. Check for center distance stability
and vibration dampening.
2. Foreign material in grooves
3. Misaligned sheaves
4. Worn sheave grooves
5. Damaged tensile member
6. Incorrectly placed flat idler
7. Mismatched belt set
8. Poor drive design
Problems with V-Belt Take-Up
Symptoms
Multiple belts stretch unequally
Single belt, or where all belts
stretch evenly
Probable Cause
Corrective Action
1. Misaligned drive
2. Debris in sheaves
3. Broken tensile member or cord
damaged
4. Mismatched belt set
1. Realign and retension drive.
2. Clean sheaves.
3. Replace all belts, install properly.
1. Insufficient take-up allowance
1. Check take-up. Use allowance
specified in Gates design manuals.
2. Redesign drive.
2. Grossly overloaded or under
designed drive
3. Broken tensile members
Belts do not match
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1. Not all belts are from the same
manufacturer
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4. Install Gates matched belt set.
3. Replace belt, install properly.
1. Use Gates belts.
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PROBLEM/SOLUTION SUMMARY TABLE
V-Belt Noise
Symptoms
Probable Cause
Corrective Action
Belt squeals or chirps
1. Belt slip
2. Contamination
1. Retension.
2. Clean belts and sheaves.
Slapping Sound
1. Loose belts
2. Mismatched set
3. Misalignment
1. Retension.
2. Install matched belt set.
3. Realign pulleys so all belts share
load equally.
Rubbing sound
1. Guard interference
1. Repair, replace or redesign guard.
Grinding sound
1. Damaged bearings
1. Replace, align & lubricate.
Unusually loud drive
1. Incorrect belt
1. Use correct belt size. Use correct
belt tooth profile for sprockets on
synchronous drive.
2. Check tension and adjust.
3. Replace sheaves.
4. Clean sheaves, improve shielding,
remove rust, paint, or remove dirt
from grooves.
2. Incorrect Tension
3. Worn sheaves
4. Debris in sheaves
Unusual Vibration
Symptoms
Probable Cause
Corrective Action
Belts flopping
1. Loose belts (under tensioned)
2. Mismatched belts
3. Pulley misalignment
1. Retension.
2. Install Gates matched belts.
3. Align pulley.
Unusual or excessive vibration
1. Incorrect belt
1. Use correct belt cross section in
pulley. Use correct tooth profile
and pitch in sprocket.
2. Check structure and brackets for
adequate strength.
3. Replace with non-defective pulley.
4. Check machine components
and guards, motor mounts,
motor pads, bushings, brackets
and framework for stability,
adequate design strength,
proper maintenance and proper
installation.
2. Poor machine or equipment
design
3. Pulley out of round
4. Loose drive components
Problems With Sheaves
Symptoms
Broken or damaged sheave
Probable Cause
Corrective Action
1. Incorrect sheave installation
1. Do not tighten bushing bolts beyond
recommended torque values.
2. Use adequate drive guard.
3. Keep pulley rim speeds below
maximum recommended value.
4. Do not pry belts onto pulleys.
2. Foreign objects falling into drive
3. Excessive rim speeds
4. Incorrect belt installation
Severe Groove Wear
1. Excessive belt tension
2. Sand, debris or contamination
3. Wrong belt
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1. Retension, check drive design.
2. Clean and shield drive as well as
possible.
3. Make sure belt and sheave
combination is correct.
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PROBLEM/SOLUTION SUMMARY TABLE
Problem With Other Drive Components
Symptoms
Bent or broken shaft
Probable Cause
Corrective Action
1. Extreme belt overtension
2. Overdesigned drive*
1. Retension.
2. Check drive design, may need to
use smaller or fewer belts.
3. Redesign drive guard.
4. Check machine design.
5. Repair, redesign for durability.
3. Accidental damage
4. Machine design error
5. Accidental damage to guard or
poor guard design
6. Pulley mounted too far away from
outboard bearing
Hot Bearings
1. Worn grooves - belts bottoming
and won’t transmit power until
overtensioned*
2. Improper tension
3. Motor manufacturer’s sheave
diameter recommendation not
followed
4. Bearing underdesigned
5. Bearing not properly maintained
6. Sheaves too far out on shaft
7. Belt Slippage
6. Move pulley closer to bearing.
1. Replace sheaves. Tension drive
properly.
2. Retension.
3. Redesign using drive design
manual.
4. Check bearing design.
5. Align and lubricate bearing.
6. Place sheaves as close as possible
to bearings. Remove obstructions
7. Retension.
* Using too many belts, or belts that are too large, can severely stress motor or driveN shafts. This can happen when load requirements are reduced on a
drive, but the belts are not redesigned accordingly. This can also happen when a drive is greatly overdesigned. Forces created from belt tensioning are
too great for the shafts.
Synchronous Drive Symptoms
Synchronous Belt Problems
Symptoms
Unusual noise
Probable Cause
Corrective Action
1. Misaligned drive
2. Too low or high tension
3. Backside idler
4. Worn sprocket
5. Bent guide flange
6. Belt speed too high
7. Incorrect belt profile for sprocket
1. Correct alignment.
2. Adjust to recommended value.
3. Use inside idler.
4. Replace.
5. Replace.
6. Redesign drive.
7. Use proper belt/sprocket
combination.
8. Redesign drive using larger
diameters.
9. Redesign drive for increased
capacity.
8. Subminimal diameter
9. Excessive load
NOTE: Belt Failure Analysis poster #12975 available. Contact your Gates Representative.
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PROBLEM/SOLUTION SUMMARY TABLE
Synchronous Belt Problems–cont.
Symptoms
Tension Loss
Probable Cause
Corrective Action
1. Weak support structure
2. Excessive sprocket wear
3. Fixed (non-adjustable) centers
1. Reinforce structure.
2. Use alternate sprocket material.
3. Use inside idler for belt
adjustment.
4. Remove debris, check guard.
5. Redesign drive for increased
capacity.
6. Redesign drive using larger
diameters.
7. Check for conductive heat
transfer from prime mover.
8. Reduce ambient drive
temperature to 185°F maximum.
4. Excessive debris
5. Excessive load
6. Subminimal diameter
7. Belt, sprocket or shafts running
too hot
8. Unusual belt degradation
Excessive Belt Edge Wear
1. Damage due to handling
2. Flange damage
3. Belt too wide
4. Belt tension too low
5. Rough flange surface finish
6. Improper tracking
7. Belt hitting drive guard or
bracketry
8. Misalignment
Tensile Break
1. Excessive shock load
2. Subminimal diameter
3. Improper belt handling and
storage prior to installation
(crimping)
4. Debris or foreign object in drive
5. Extreme sprocket run-out
Belt Cracking
1. Subminimal diameter
2. Backside idler
3. Extreme low temperature at start-up.
4. Extended exposure to harsh
chemicals
5. Cocked bushing/sprocket assembly
Premature Tooth Wear
1. Too low or high belt tension
2. Belt running partly off unflanged
sprocket
3. Misaligned drive
4. Incorrect belt profile for sprocket 5. Worn sprocket
6. Rough sprocket teeth
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1. Follow proper handling instructions.
2. Repair flange or replace sprocket.
3. Use proper width sprocket.
4. Adjust tension to recommended
value.
5. Replace or repair flange (to
eliminate abrasive surface).
6. Correct alignment.
7. Remove obstruction or use inside
idler.
8. Realign drive.
1. Redesign drive for increased
capacity.
2. Redesign drive using larger
diameters.
3. Follow proper storage and
handling procedures.
4. Remove objects and check guard.
5. Replace sprocket.
1. Redesign drive using larger
diameter.
2. Use inside idler or increase
diameter of backside idler.
3. Pre-heat drive environment.
4. Protect drive.
5. Install bushing per instructions.
1.Adjust to recommended value.
2.Correct alignment.
3.Correct alignment.
4.Use proper belt/sprocket
combination.
5.Replace.
6.Replace sprocket.
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PROBLEM/SOLUTION SUMMARY TABLE
Synchronous Belt Problems–cont.
Symptoms
Premature Tooth Wear–cont.
Probable Cause
Corrective Action
7.Damaged sprocket
8.Sprocket not to dimensional
specification
9.Belt hitting drive bracketry or
other structure
10. Excessive load
7.Replace.
8.Replace.
1.Insufficient hardness of sprocket
1
material
12. Excessive debris
13. Cocked bushing/sprocket
assembly
Tooth Shear
1. Excessive shock loads
2. Less than 6 teeth-in-mesh
3. Extreme sprocket run-out
4. Worn sprocket
5. Backside idler
6. Incorrect belt profile for the
sprocket
7. Misaligned drive
8. Belt undertensioned
Belt Ratcheting
1. Drive is undertensioned
2. Excessive shock loads
3. Drive framework not rigid
Land Area Worn
1. Excessive tension
2. Excessive sprocket wear
9.Remove obstruction or use idler.
0.Redesign drive for increased
1
capacity.
11.Use a more wear-resistant
sprocket.
12.Remove debris, check guard.
13.Install bushing per instructions.
1. Redesign drive for increased
capacity.
2. Redesign drive.
3. Replace sprocket.
4. Replace.
5. Use inside idler.
6. Use proper belt/sprocket
combination.
7. Realign.
8. Adjust tension to recommended
value.
1. Adjust tension to recommended
value.
2. Redesign drive for increased
capacity.
3. Reinforce system.
1. Adjust tension to recommended
value.
2. Check sprocket condition.
Replace if necessary.
Synchronous Sprocket Problems
Symptoms
Probable Cause
Corrective Action
Flange Failure
1.Belt forcing flange off
1.Correct alignment or properly
secure flange to sprocket.
Unusual Sprocket Wear
1. Sprocket has too little wear
resistance (i.e. plastic, aluminum,
soft metals)
2. Misaligned drive
3. Excessive debris
4. Excessive load
1. Use alternate sprocket material.
5. Belt tension too low or high
6. Incorrect belt profile
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2. Correct alignment.
3. Remove debris, check guard.
4. Redesign drive for increased
capacity.
5. Adjust tension to recommended
value.
6. Use proper belt/sprocket
combination.
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PROBLEM/SOLUTION SUMMARY TABLE
Synchronous Sprocket Problems–cont.
Symptoms
Probable Cause
Corrective Action
1. Rust caused by high moisture
conditions in the production area,
or by the use of water-based
cleaning solutions.
1. Replace cast iron sprockets with
nickel plated or stainless steel
sprockets and use stainless steel
bushings.
Probable Cause
Corrective Action
Incorrect driveN speed
1. Design error
1. Use correct driveR/driveN sprocket
size for desired speed ratio.
Belt Tracking
1. Belt running partly off unflanged
sprocket
2. Centers exceed 8 times small
sprocket diameter
1. Correct alignment.
Rust and Corrosion
Performance Problems
Symptoms
3. Excessive belt edge wear
Excessive Temperature (Belt,
Bearing, Housing, Shafts, etc.)
1. Misaligned drive
2. Too low or high belt tension
3. Incorrect belt profile
2. Correct parallel alignment to set
belt to track on both sprockets.
Flange both sprockets.
3. Correct alignment.
1. Correct alignment.
2. Adjust tension to recommended
value.
3. Use proper belt/sprocket
combination.
Shafts Out of Sync
1. Design error
2. Incorrect belt
1. Use correct sprocket sizes.
2. Use correct belt with correct
tooth profile for grooves.
Vibration
1. Incorrect belt profile for the
sprocket
2. Too low or high belt tension
1.Use proper belt/sprocket
combination.
2.Adjust tension to recommended
value.
3. Check and reinstall per instructions.
3. Bushing or key loose
NOTE: Belt Failure Analysis poster #12975 available. Contact your Gates Representative.
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MAINTENANCE TOOLS
The tools available to help troubleshoot drive problems
range from the surprisingly simple to complicated.
Following is a list of tools that can be used to effectively
diagnose a problem. While Gates does not sell all
of the items discussed in this section, the items are
readily available from industrial instrumentation outlets
throughout the United States.
Eyes, Ears & Nose
When troubleshooting a belt drive problem, stand back
and observe the drive while it is in operation and at rest.
Is there a warm rubber smell? Is there anything unusual
about the way the belt travels around the drive? Is the drive
frame flexing under load? Are there chirping, squealing or
grinding noises? Is there an accumulation of dust or debris
beneath the drive which might interfere with the belts?
Squirt Bottle With Soapy Water
When a belt drive is excessively noisy, the belt is often
incorrectly blamed. It is easy to eliminate the belt as the
problem by spraying it with soapy water while it is running.
If the noise goes away, or decreases, then the belt is part
of the problem. If the same noise is still present, the
problem is likely due to other drive components.
String
Variation in drive center distance, often caused by weak
supporting structure, can cause problems from vibration
to short belt life. To determine if center distance variation
exists, turn off the drive and tightly tie a piece of string
from the driveR to the driveN shaft. Start up the drive and
note if the string stretches almost to the point of breaking,
or goes slack. If either is the case, the problem could be
center distance variation.
It is particularly important to observe the string right at
drive start up when the loads are highest. String can also
be used to check pulley alignment.
Belt & Sheave Groove Gauges
If a belt-to-sheave groove mismatch is suspected,
English and metric belt and sheave groove gauges can
be used to check dimensions. These also are handy for
identifying a belt cross section for replacements and
for checking
sheave grooves
for wear.
These gauges
are available
from Gates
distributors.
English Gauge:
Product No.
7401-0014
Metric Gauge:
Product No.
7401-0013
Long Straight
Edge
While V-belts can be somewhat forgiving of
misalignment, this condition can still affect V-belt
performance. Even slight misalignment can cause major
problems on a synchronous drive. Use a long straight
edge, made of wood, metal or any rigid material, to
quickly check drive alignment. Simply lay the straight
edge across the pulley faces and note the points of
contact (or lack of contact).
Design Flex® Pro™ and Design IQ™ Software
Gates design suite of engineering programs include
interactive support software and a user friendly interface
for rapid data retrieval and smooth design work.
Both programs are available at www.gates.com/
drivedesign.
NOTE: In some cases redesign of the drive is
necessary. Gates Design Flex® Pro™ drive design
software provides a quick, accurate and flexible method
of correctly redesigning problem drives.
On-the-go belt tensioning
information is available in
our PT Toolkit mobile app.
Download today.
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MAINTENANCE TOOLS
A
B
C
H
G
Belt Tension Testers
Improper belt tension, either too
high or too low, can cause belt drive
problems. An “experienced” thumb
may be okay for ordinary drives, but
for critical drives, Gates recommends
using a tension gauge. Proper tension
and installation can extend belt life
and reduce costly downtime.
Several types of tension gauges are
available.
A. Tension Tester
(Product No. 7401-0076)
Maximum deflection force: 30 lbs.
For use with all small V-belt and
Synchronous drives, including
PowerBand® and Poly Chain® GT®
Carbon™ belt drives.
B. Double Barrel
Tension Tester
(Product No. 7401-0075)
Maximum deflection force: 66 lbs.
For use with all multiple
V-belt and large Synchronous
drives, including PowerBand® and
Poly Chain® GT® Carbon™ belt
drives.
C. 5-Barrel Tension Tester
(Product No. 7401-0079)
Maximum deflection force: 165 lbs.
for use with multiple V-belt and
large Synchronous drives.
D. Krikit Gauge
(Product No. 7401-0071)
For use with Automotive V-belts
up to and including 7/8" top width.
Krikit II
(Product No. 7401-0072)
For use with Automotive V-ribbed
belts up to 8 ribs in width.
I
E. Sonic Tension Meter
Model 508C
(Product No. 7420-0508)
For extremely accurate belt tension
measuring, the Gates Sonic Tension
Meter is an electronic device that
measures the natural frequency of a
free stationary belt span and instantly
computes the static belt tension
based upon the belt span length, belt
width and belt type.
Features:
• Can be used for synchronous and
V-belts.
• Uses sound waves instead of
force/deflection.
• Results are repeatable with any
operator.
• Portable, lightweight and easy to use.
• Fast. Calculates tension in seconds.
• Can be used in almost any
environment.
• Model 508C runs on two AAA
batteries.
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Accessories:
F. Flexible Sensor
(Product No. 7420-0205)
G. Optional Inductive Sensor
(Product No. 7420-0212)
H. Replacement Magnets
for Inductive Sensor
(Prod. No. 7420-1212, set of 10)
I. EZ Align® Laser Alignment Tool (Product No. 7420-1000
- Red Laser)
(Product No. 7420-3000
- Green Laser)
• Compact design
• Laser projects a line
• Mirror reflects laser line, making
it easy to align shafts
• Laser line is very easy to read on
targets
• Includes a hard foam filled plastic
carrying case
• Green laser is ideal for outdoor or
bright environment use
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MAINTENANCE TOOLS
Dial Indicator
Infrared Pyrometer
Strobe Tachometer
Improperly mounted sheaves or
out-of-round pulleys are sometimes
the root of vibration or more severe
problems. This device can be used to
measure side-to-side sheave wobble
or diameter variation by holding it
up to the sheave sidewall or top of
the belt inside the pulley groove,
respectively. IMPORTANT: Always turn
off the machine before using the dial
indicator. Rotate the drive by hand to
make your measurements.
The pyrometer accurately measures
external belt temperatures and
environmental temperatures.
It is not always possible to see what
is happening to a drive while it is in
operation. This instrument visually
stops the action to get a better idea of
the dynamic forces affecting the drive.
The strobe tachometer is best used
after initial diagnosis of the problem
because it helps pinpoint the cause. It
will help identify such things as single
or dual mode belt span vibration and
frame flexure.
Noise Meter
Use a noise meter to measure
environmental and belt drive noise.
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TECHNICAL INFORMATION
Table No. 1
Table No. 2
Heavy-Duty V-Belt Section, Sheave Diameters and
Standard Groove Angles
Maximum Allowable Outside Diameters
For Cast Iron Pulleys
Belt
Section
Sheave Datum
Diameter
(D.D.) (in)
Standard
Groove Angle
(± 0.20˚)
A, AX
Up to 5.40
34
A, AX
Over 5.40
38
B, BX
Up to 7.00
34
B, BX
Over 7.00
38
C, CX
Up to 7.99
34
C, CX
8.00 to 12.00
36
C, CX
Over 12.00
38
D
Up to 12.99
34
D
13.00 to 17.00
36
D
Over 17.00
38
E
Up to 24.00
36
E
Over 24.00
38
3V, 3VX
Up to 3.49
36
3V, 3VX
3.50 to 6.00
38
3V, 3VX
6.00 to 12.00
40
3V, 3VX
Over 12.00
42
5V, 5VX
Up to 9.99
38
5V, 5VX
10.00 to 16.00
40
5V, 5VX
Over 16.00
42
8V
Up to 15.99
38
8V
16.00 to 22.40
40
8V
Over 22.40
42
Maximum
Shaft
Speed
(RPM)
Maximum Allowable
Pulley
Diameter
(in)
600
41.40
870
28.50
1,160
21.40
1,400
17.70
1,600
15.50
1,750
14.20
2,000
12.40
2,400
10.30
2,800
8.80
3,000
8.30
3,450
7.20
4,000
6.20
4,500
5.50
5,000
5.00
7,500
3.31
10,000
2.48
Table No. 3
Depth hk
Shaft Diameter
Width wk+0.015-0.000
(in)
(in)*(in)
Up Through 7/16 (0.44)
Over 7/16 (0.44) To and Incl. 9/16(0.56)
Over 9/16 (0.56) To and Incl. 7/8 (0.88)
Over 7/8 (0.88) To and Incl. 1 1/4 (1.25)
3/32(0.094)
1/8 (0.125)
3/16(0.188)
1/4 (0.250)
3/64 (0.047)
1/16 (0.062)
3/32 (0.094)
1/8 (0.125)
Over 1 1/4
Over 1 3/8
Over 1 3/4
Over 2 1/4
(1.25) To and Incl.
(1.38) To and Incl.
(1.75) To and Incl.
(2.25) To and Incl.
1 3/8 (1.38)
1 3/4 (1.75)
2 1/4 (2.25)
2 3/4 (2.75)
5/16(0.312)
3/8 (0.375)
1/2 (0.500)
5/8 (0.625)
5/32 (0.156)
3/16 (0.188)
1/4 (0.250)
5/16 (0.312)
Over 2 3/4
Over 3 1/4
Over 3 3/4
Over 4 1/2
(2.75) To and Incl.
(3.25) To and Incl.
(3.75) To and Incl.
(4.50) To and Incl.
3 1/4 (3.25) 3/4
3 3/4 (3.75) 7/8
4 1/2 (4.50)
1
5 1/2 (5.50)
1 1/4
(0.750)
(0.875)
(1.000)
(1.250)
3/8 (0.375)
7/16 (0.438)
1/2 (0.500)
5/8 (0.625)
Over 5 1/2
Over 6 1/2
Over 7 1/2
Over 9
Over 11
(5.50) To and Incl.
(6.50) To and Incl.
(7.50) To and Incl.
(9.00) To and Incl.
(11.00) To and Incl.
6 1/2 (6.50)
7 1/2 (7.50)
9
(9.00)
11 (11.00)
13 (13.00) (1.500)
(1.750)
(2.000)
(2.500)
(3.000)
3/4
3/4
3/4
7/8
1
1 1/2
1 3/4
2
2 1/2
3
(0.750)
(0.750)
(0.750)
(0.875)
(1.000)
*Tolerance on Width, wk for widths up through 1/2’’ (0.500) . . . . . . . . . . . . . . +0.002-0.000
For widths over 1/2’’ (0.500) through 1’’ (1.000). . . . . . . . . . . . . . . . . . . . . . . +0.003-0.000
For widths over 1’’ (1.000). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +0.004-0.000
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NEMA MINIMUM DIAMETERS
Electric Motor Frames
and Minimum Sheave and Sprocket Diameters
Table No. 4
The National Electric Manufacturers
Association (NEMA) publishes
recommendations for the minimum
diameter of sheaves to be used on
General Purpose electric motors.
Purpose of the recommendations
is to prevent the use of too small
sheaves, which can result in shaft or
bearing damage because belt pull
goes up as sheave diameter goes
down.
The NEMA Standard MG-1-14.42,
November 1978 shows minimum
recommended sheave diameters
as a function of frame number. The
table below lists the NEMA frame
assignments and minimum diameter
recommendations according to the
1964 rerating program.
Synchronous
Horsepower at Synchronous Speed (rpm)
Belts
Motor
Shaft
3600
1800
1200
900
Minimum
Frame
Diameter
Pitch
(3450)(1750)(1160) (870)
Code
(in)
Diameter (in)
143T0.875 1-1/2
145T
0.875
2 - 3
1
1-1/2 - 2
3/4
1
1/2
2.0
3/4
2.2
182T
1.1253 31-1/21 2.2
182T
1.125
5 ———2.4
184T
1.125
—
—
2
1-1/2
2.2
184T
1.125
5 ———2.2
184T
1.125
7-1/2
5
—
—
2.7
213T
1.375
7-1/2-10
7-1/2
3
2
2.7
215T
1.375
10
—
5
3
2.7
215T
1.375
15
10
—
—
3.4
254T
1.625
15
—
7-1/2
5
3.4
254T
1.625
20
15
—
—
4.0
256T
1.625
20-25
—
10
7-1/2
4.0
256T
1.625
—
20
—
—
4.0
284T
1.875
—
—
15
10
4.0
284T
1.875
—
25
—
—
4.0
286T
1.875
— 302015 4.7
324T
2.125
— 402520 5.4
326T
2.125
— 503025 6.1
364T
2.375
—
—
40
30
6.1
364T
2.375
—
60
—
—
6.7
365T
2.375
—
—
50
40
7.4
365T
2.375
—
75
—
—
7.7
404T
2.875
— —60— 7.2
404T
2.875
—
—
—
50
404T
2.875
—
100
—
—
7.6
7.7
405T
2.875
—
—
75
60
9.0
405T
2.875
—
100
—
—
7.7
405T
2.875
—
125
—
—
9.5
444T
3.375
— —100— 9.0
444T
3.375
—
—
—
75
8.6
444T
3.375
—
125
—
—
9.5
444T
3.375
—
150
—
—
9.5
445T
3.375
— —125— 10.8
445T
3.375
—
—
—
100
10.8
445T
3.375
—
150
—
—
10.8
445T
3.375
—
200
—
—
11.9
For other than the General Purpose AC motors (for example, DC motors, Definite
Purpose motors, motors with special bearings or motors that are larger than
those covered by the NEMA standard), consult the motor manufacturer for
minimum sheave diameter recommendations. It is helpful to the manufacturer to
include details of the application with your inquiry.
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NEMA MINIMUM DIAMETERS
Minimum Recommended Sprocket Outside Diameters
for General Purpose Electric Motors
Data in the white area are from NEMA Standard MG-1-14-42, June
1972. Figures in black area are from MG-1-43, January 1968. The
gray area is a composite of electric motor manufacturer data. They
are generally conservative and specific motors and bearings may
permit the use of a smaller motor sprocket. Consult the motor
manufacturer.
NOTE: For a given horsepower and speed, the total belt pull is
related to the motor sprocket size. As the size decreases, the
total belt pull increases. Therefore, to limit the resultant load on
motor and shaft bearings, NEMA lists minimum sprocket sizes for
the various motors. The sprocket on the motor (DriveR sprocket)
should be at least this large.
NEMA Minimum Sprocket Diameters
Motor RPM (60 Cycle and 50 Cycle Electric Motors)
Motor
Horsepower
575
485•
690
575•
870
725•
1160
950•
1750
1425•
3450
2850•
Motor
Horsepower
1/2
3/4
1
1-1/2
2
3
5
7-1/2
10
15
20
25
30
40
50
60
75
100
125
150
200
250
300
2.7
2.7
3.4
4.1
4.1
4.7
5.4
6.1
7.4
8.1
9.0
9.0
9.9
10.8
12.6
16.2
18.0
19.8
19.8
19.8
24.3
2.3
2.7
2.7
3.4
4.1
4.1
4.7
5.4
6.1
7.4
8.1
9.0
9.0
9.9
11.7
13.5
16.2
18.0
19.8
19.8
24.3
2.0
2.2
2.2
2.2
2.7
2.7
3.4
4.0
4.0
4.7
5.4
6.1
6.1
7.4
7.6
9.0
8.6
10.8
13.5
16.2
19.8
-
2.0
2.2
2.2
2.2
2.7
2.7
3.4
4.0
4.0
4.7
5.4
6.1
6.1
7.4
7.2
9.0
9.0
10.8
11.7
-
2.0
2.2
2.2
2.2
2.7
2.7
3.4
4.0
4.0
4.0
4.7
5.4
6.1
6.7
7.7
7.7
9.5#
9.5
11.9
-
2.0
2.2
2.2
2.2
2.7
2.7
3.4
4.0
4.0
-
1/2
3/4
1
1-1/2
2
3
5
7-1/2
10
15
20
25
30
40
50
60
75
100
125
150
200
250
300
Table No. 5
*These RPM are for 50 cycle electric motors.
# Use 8.6 for Frame Number 444 T only.
NEMA Minimum V-Belt Sheave Diameters
Table No. 7
Table No. 6
Minimum Recommended Sheave Outside Diameters for General
Purpose Electric Motors
Super HC ® V-Belts, Super HC PowerBand ® Belts,
Polyflex ® JB® Belts.
MotorMotor RPM (60 cycle and 50 cycle Electric Motors)
Horse-
575
690
870
1160
1750
3450
power 485*
575*
725*
950*
1425* 2850
Motor
Horsepower
1/2——2.2—— —1/2
3/4 — —2.42.2— —3/4
1 3.02.52.4 2.42.2 — 1
1 1/23.03.02.4 2.42.4 2.21 1/2
2 3.83.03.0 2.42.4 2.4 2
3 4.53.83.0 3.02.4 2.4 3
5 4.54.53.8 3.03.0 2.4 5
7 1/25.24.54.4 3.83.0 3.07 1/2
10 6.05.24.4 4.43.8 3.0 10
15 6.86.05.2 4.44.4 3.8 15
20 8.26.86.0 5.24.4 4.4 20
25 9.08.26.8 6.04.4 4.4 25
30 10.09.06.8 6.85.2 — 30
40 10.0 10.0 8.2
6.8 6.0
—
40
50 11.0 10.0 8.4
8.2 6.8
—
50
60 12.011.010.0 8.0 7.4 — 60
75 14.013.09.5 10.08.6 — 75
100 18.015.012.0 10.0 8.6 — 100
125 20.018.015.0 12.010.5# — 125
150 22.020.018.0 13.010.5 — 150
200 22.022.022.0 — 13.2 — 200
250 22.0 22.0
—
—
—
—
250
300 27.0 27.0
—
—
—
—
300
*These RPM are for 50 cycle electric motors.
# 9.5 for Frame Number 444T.
Minimum Recommended Sheave Datum Diameters for General
Purpose Electric Motors
Hi-Power ® II V-Belts, Hi-Power II PowerBand Belts
or Tri-Power® Molded Notch V-Belts.
MotorMotor RPM (60 cycle and 50 cycle Electric Motors)
Horse-
575
690
870
1160
1750
3450
power 485*
575*
725*
950*
1425* 2850
Motor
Horsepower
1/2 2.5
2.5
2.2
—
—
—
1/2
3/4 3.0
2.5
2.4 2.2
—
—
3/4
1 3.0 2.5 2.42.42.2 — 1
1 1/2
3.0
3.0
2.4
2.4
2.4
2.2
1 1/2
2 3.8 3.0 3.02.42.4 2.4 2
3 4.5 3.8 3.03.02.4 2.4 3
5 4.5 4.5 3.83.03.0 2.6 5
7 1/2
5.2
4.5
4.4
3.8
3.0
3.0
7 1/2
106.0 5.2 4.64.43.8 3.0 10
156.8 6.0 5.44.64.4 3.8 15
208.2 6.8 6.05.44.6 4.4 20
259.0 8.2 6.86.05.0 4.4 25
3010.0 9.0 6.86.85.2 — 30
4010.010.08.26.86.0 — 40
5011.010.09.08.26.8 — 50
60 12.0 11.0 10.0 9.0 7.4
—
60
75 14.0 13.0 10.5 10.0 9.0
—
75
10018.0 15.0 12.511.010.0 — 100
125 20.0 18.0 15.0 12.5 11.5† —
125
150 22.0 20.0 18.0 13.0 —
—
150
200 22.0 22.0 22.0 —
—
—
200
250
22.0
22.0——— —250
300
27.0
27.0——— —300
*These RPM are for 50 cycle electric motors.
† 11.0 for Frame Number 444T.
Data in Tables 5, 6 and 7 are from NEMA Standard MG-1-14.42, MG-1-14.43,
MG-1-14.45 and a composite of electic motor manufacturers data. They are
generally conservative and specific motors may permit the use of smaller motor
sheaves or sprockets. Consult the motor manufacturer.
®
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53
12/16/14 12:07 PM
MINIMUM RECOMMENDED DIAMETERS
Minimum Recommended Sprocket Sizes
By Belt Cross Section
Minimum Recommended Sheave Diameter
By Belt Cross Section
Table No. 8
Classical V-Belts
2L
3L
4L
5L
J
L
M
3M
5M
7M
11M
54
PM_Manual_Guts_2015.indd 54
Narrow V-Belts
Light Duty V-Belts
Micro-V® Belts
Polyflex® JB® Belts
Min Recommended Sprocket Size
(No. of Teeth)
PowerGrip® Timing
MXL
XL
L
H
XH
XXH
2.20
3.00
4.00
5.40
6.80
9.00
13.00
21.00
PowerGrip® HTD®
3M
5M
8M
14M
20M
Min Recommended
Outside Diameter
(Standard Groove) (in)
Belt
Cross
Section
3VX
3V
5VX
5V
8V
Belt Pitch
Min Recommended
Datum Diameter
(Standard Groove) (in)
Belt
Cross
Section
AX
A
BX
B
CX
C
D
E
Table No. 9
2.20
2.65
4.40
7.10
12.50
PowerGrip® GT®2
2M
3M
5M
8M
14M
0.8
1.5
2.5
3.5
Poly Chain® GT® Carbon™
8M
14M
Synchro-Power® Polyurethane
MXL
XL
L
H
T2.5
T5
T10
T20
AT5
AT10
AT20
5mm HTD
8mm HTD
14mm HTD
0.8
3.00
7.00
0.67
1.04
1.67
2.64
®
®
12
12
12
14
18
18
12
14
22
28
34
12
16
18
22
28
22
28
10
10
10
14
12
10
16
15
12
18
18
10
16
28
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12/16/14 12:07 PM
MINIMUM RECOMMENDED DIAMETERS
Minimum Recommended Idler Diameters By Belt Cross Section
Table No. 10
Belt Cross Section
Classical
A
B
C
D
E
AX
BX
CX
AA
BB
CC
Super HC 3V
5V
8V
3VX
5VX
Predator CP
3VP
5VP
8VP
Minimum
Grooved
Inside
(grooves)
Min. O.D.
Flat Inside
Idler (in)
Min. O.D.
Flat
Backside
Idler (in)
3.00
5.400
9.00
13.00
21.00
2.20
4.00
7.00
3.00
5.40
9.00
2.65
7.10
12.50
2.20
4.40
9.00
2.65
7.10
12.50
2.25
3.75
5.75
7.50
19.00
------2.25
3.75
5.75
----------5.75
-------
4.25
6.00
8.50
13.50
27.30
4.25
6.00
8.50
------4.25
10.00
17.50
4.25
10.00
8.50
4.25
8.50
17.50
®
PM_Manual_Guts_2015.indd 55
®
Belt Cross Section
Minimum
Grooved
Inside
(grooves)
Min. O.D.
Flat Inside
Idler (in)
Min. O.D.
Flat
Backside
Idler (in)
MXL PowerGrip Timing
12
1.00
0.50
XL PowerGrip Timing
12
2.50
1.00
L PowerGrip Timing
10
4.75
1.60
H PowerGrip Timing
14
6.38
2.88
XH PowerGrip Timing
18
11.00
6.38
XXH PowerGrip Timing
18
15.75
9.25
2M PowerGrip GT3
12
1.00
0.50
3M PowerGrip GT3 + HTD
12
1.50
0.75
5M PowerGrip GT3 + HTD
14
2.50
1.25
8M PowerGrip GT3 + HTD
22
4.00
2.80
14M PowerGrip GT3 + HTD
28
7.00
6.50
20M PowerGrip HTD
34
10.00
11.00
5M Poly Chain GT Carbon
16
2.50
1.88
8M Poly Chain GT Carbon
25
4.00
3.00
14M Poly Chain GT Carbon
28
7.00
6.50
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55
12/16/14 12:07 PM
INSTALLATION AND TENSIONING ALLOWANCES
Minimum Center Distance Allowances for Belt Installation and Takeup
Table No. 11
Minimum Center Distance
Allowance for Initial
Tensioning and Subsequent
Takeup (in)
Minimum Center Distance Allowance
for Installation (in)
V-Belt
Number
3V/3VX
5V/5VX
8V
Super HC
V-Belts
Super HC
V-Belts
Up To and Incl. 475
Over 475 To and Incl. 710
Over 710 To and Incl. 1060
0.5
0.8
0.8
1.2
1.4
1.4
1.0
1.0
2.1
2.1
1.5
3.4
1.0
1.2
1.5
Over 1060 To and Incl. 1250
Over 1250 To and Incl. 1700
Over 1700 To and Incl. 2000
0.8
0.8
1.4
1.4
1.0
1.0
1.0
2.1
2.1
2.1
1.5
1.5
1.8
3.4
3.4
3.6
1.8
2.2
2.5
Over 2000 To and Incl. 2360
Over 2360 To and Incl. 2650
Over 2650 To and Incl. 3000
1.2
1.2
1.2
2.4
2.4
2.4
1.8
1.8
1.8
3.6
3.6
3.6
3.0
3.2
3.5
Over 3000 To and Incl. 3550
Over 3550 To and Incl. 3750
Over 3750 To and Incl. 5000
Over 5000 To and Incl. 6000
1.2
2.4
2.0
2.0
2.0
2.0
4.0
4.0
4.0
4.0
4.0
4.5
5.5
6.0
®
Super HC®
PowerBand®
Belt*
All Cross Sections
Super HC®
PowerBand®
Belt*
®
Super HC
V-Belts
Super HC®
PowerBand®
Belt*
®
All Types
*Also use these figures for individual Super HC V-Belts in deep groove sheaves.
Minimum Center Distance Allowances for Belt Installation and Takeup
Table No. 12
Minimum
Center Distance
Allowance for Initial
Tensioning and
Subsequent
Takeup (in)
Minimum Center Distance Allowance
for Installation
(in)
V-Belt
Number
A
B
C
Hi-Power ||
and
Tri-Power®
Molded
Notch
V-Belts
Hi-Power ||
PowerBand
Belt*
Hi-Power ||
and
Tri-Power®
Molded
Notch
V-Belts
Hi-Power ||
PowerBand
Belt*
Up To and Incl. 35
Over 35 To and Incl. 55
Over 55 To and Incl. 85
0.75
0.75
0.75
1.20
1.20
1.30
1.00
1.00
1.25
Over 85 To and Incl. 112
Over 112 To and Incl. 144
Over 144 To and Incl. 180
1.00
1.00
1.30
1.50
Over 180 To and Incl. 210
Over 210 To and Incl. 240
Over 240 To and Incl. 300
D
All Cross Sections
Hi-Power ||
and
Tri-Power®
Molded
Notch
V-Belts
Hi-Power ||
PowerBand
Belt*
1.50
1.50
1.60
1.50
1.50
2.00
2.00
1.25
1.25
1.25
1.60
1.80
1.80
1.50
1.50
2.00
2.00
2.10
2.20
2.00
2.00
2.90
3.00
2.50
3.40
2.50
3.00
3.50
1.50
1.50
1.50
1.90
2.00
2.20
2.00
2.00
2.00
2.30
2.50
2.50
2.00
2.50
2.50
3.20
3.20
3.50
2.50
2.50
3.00
3.50
3.60
3.90
4.00
4.50
5.00
2.00
2.50
2.70
2.90
2.50
3.00
3.60
4.10
3.00
3.50
4.00
4.40
6.00
1.5% of belt
length
Over 300 To and Incl. 390
Over 390
Hi-Power ||
and
Tri-Power®
Molded
Notch
V-Belts
E
Hi-Power ||
PowerBand
Belt*
Hi-Power ||
V-Belts
Hi-Power ||
PowerBand
Belt*
All Types
1.00
1.50
2.00
*Also use these figures for individual Hi-Power II and Tri-Power Molded Notch V-Belts in deep groove sheaves.
56
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INSTALLATION AND TENSIONING ALLOWANCES
Table No. 13
Micro-V® Belts
V-Belt
Number
Minimum Center Distance
Allowance For Initial
Tensioning and Subsequent
Takeup (in)
Minimum Center Distance Allowance
for Installation (in)
Standard Effective Length (in)
J
L
M
All Cross Sections
Up through 20.0
20.1 through 40.0
40.1 through 60.0
60.1 through 80.0
80.1 through 100.0
0.4
0.5
0.6
0.7
0.8
—
—
0.9
1.0
1.2
—
—
—
—
1.5
0.3
0.5
0.7
0.9
1.1
100.1 through 120.0
120.1 through 160.0
160.1 through 200.0
200.1 through 240.0
240.1 through 300.0
—
—
—
—
—
1.2
1.4
—
—
—
1.6
1.7
1.8
1.9
2.2
1.3
1.7
2.2
2.6
3.3
300.1 through 360.0
60.1 through 370.0
—
—
—
—
2.5
2.7
3.9
4.6
Table No. 14
Polyflex® JB® Belts
V-Belt
Number
Minimum Center Distance
Allowance For Initial
Tensioning and Subsequent
Takeup (in)
Minimum Center Distance Allowance
for Installation (in)
Standard Effective Length (in)
3M
5M
7M
11M
All Cross Sections
180-300
307-750
750-1090
1120-1500
1550-1900
1950-2300
.18
.28
—
—
—
—
0.4
0.6
0.9
1.1
—
—
—
0.6
0.9
1.1
1.1
1.5
—
1.0
1.2
1.4
1.5
1.9
0.2
0.6
1.1
1.4
1.4
1.8
Table No. 15
Poly Chain® GT® Carbon™ Installation
& Tensioning Allowances
Standard Installation Allowance
(Flanged Sprockets Removed
for Installation)
(mm)
(in)
Tensioning
Allowance
(Any Drive)
(mm)
(in)
1000
40
1.8
0.07
0.8
0.03
Over
1000 1780
to
40
70
2.8
0.11
0.8
0.03
Over
1780 2540
to
70
100
3.3
0.13
1.0
0.04
Over
2540 3300
to
100
130
4.1
0.16
1.0
0.04
Over
3300 4600
to
130
180
5.3
0.21
1.3
0.05
Belt
Length
(mm)
(in)
Center Distance Allowance For
Installation and Tensioning
Up to
®
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INSTALLATION AND TENSIONING ALLOWANCES
Table No. 16
Additional Center Distance
Allowance for Installation Over
Flanged Sprocket*
Belt
Pitch
(mm)
(in)
(Add to Installation Allowance in
Above Table)
One Sprocket
Flanged
(mm)
(in)
Both Sprockets
Flanged
(mm)
(in)
8mm
21.8
0.86
33.3
1.31
14mm
31.2
1.23
50.0
1.97
* For drives that require installation of the belt over one sprocket at a time, use the value
for both sprockets flanged — even if only one sprocket is flanged.
Table No. 17
Power Grip GT®3 and HTD Center
Distance Allowance for Installation
and Tensioning
Standard Installation Allowance
(Flanged Sprockets Removed
for Installation)
(mm)
(in)
Tensioning
Allowance
(Any Drive)
(mm)
(in)
125
5
0.5
0.02
0.5
0.02
Over
125
250
to
5
10
0.8
0.03
0.8
0.03
Over
250
500
to
10
20
1.0
0.04
0.8
0.03
Over
500
1000
to
20
40
1.8
0.07
0.8
0.03
Over
1000 1780
to
40
70
2.8
0.10
0.8
0.04
Over
1780 2540
to
70
100
3.3
0.13
1.0
0.04
Over
2540 3300
to
100
130
4.1
0.16
1.3
0.05
Over
3300 4600
to
130
180
4.8
0.19
1.3
0.05
Over
4600 6900
to
180
270
5.6
0.22
1.3
0.05
Belt
Pitch
(mm)
(in)
Up to
Table No. 18
Additional Center Distance
Allowance for Installation Over
Flanged Sprockets*
Belt
Pitch
(mm)
(in)
(Add to Installation Allowance in
Above Table)
5mm
13.5
0.53
19.1
0.75
8mm
21.8
0.86
33.3
1.31
14mm
31.2
1.23
50.0
1.97
20mm
47.0
1.85
77.5
3.05
One Sprocket
Flanged
(mm)
(in)
Both Sprockets
Flanged
(mm)
(in)
* For drives that require installation of the belt over one sprocket at a time, use the value
for “Both Sprockets Flanged”.
58
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INSTALLATION AND TENSIONING ALLOWANCES
Table No. 19
Power Grip® Timing Belts Center
Distance Allowance for Installation
and Tensioning
Belt
Length
(in)
Standard Installation Allowance
(Flanged Pulleys Removed
for Installation)
(in)
Tensioning
Allowance
(Any Drive)
(in)
3.6 to 5.0
.02
.02
Over 5.0
to 10.0
.03
.03
Over 10.0
to 20.0
.04
.03
Over 20.0
to 40.0
.05
.04
Over 40.0
to 60.0
.07
.05
Over 60.0
to 180.0
.12"
.08"
Table No. 20
Additional Center Distance
Allowance for Installation Over
Flanged Pulleys*
(Add to Installation Allowance in
Above Table)
Belt Pitch
(in)
Small Pulley Flanged
(in)
Both Pulleys Flanged
(in)
0.080" (MXL)
.33
.49
0.200" (XL)
.46
.71
0.375" (L)
.64
.85
0.500" (H)
.64
.96
0.875" (XH)
1.14
1.92
1.250" (XXH)
1.53
2.65
* For drives that require installation of the belt over one sprocket at a time, use the value for both
pulleys flanged — even if only one pulley is flanged.
Table No. 21
Estimating Belt Length from Drive
Dimensions
Belt Length = 2C + 1.57 (D + d) + (D - d)
4C
(2 Pulleys)
Where: C = Shaft Center Distance
2
a.) For Super HC®:
Belt Length = Belt Outside Diameter
D = O.D. of Larger Pulley
d = O.D. of Smaller Pulley
Belt Length = Datum Length
D = Datum Diameter of Larger Pulley
d = Datum Diameter of Smaller Pulley
b.) For Hi-Power® II
and Tri-Power®
Molded Notch:
c.) For Synchronous
Belts:
®
PM_Manual_Guts_2015.indd 59
®
Belt Length = Pitch Length
D = Pitch Diameter of Larger Sprocket
d = Pitch Diameter of Smaller Sprocket
www.gates.com/drivedesign
59
12/16/14 12:07 PM
IDLER HARDWARE
Flat Idler Pulley
Flat Idler Pulley
Use With Synchonous Belt
Part
No.
Product
No.
Pitch
4.25x1.25-IDL-FLAT
7723-4125
8mm, L, H
4.25x1.25-IDL-FLAT
7723-4200
8mm, L, H
4.25x1.25-IDL-FLAT
7723-4300
8mm, L, H
4.25x1.25-IDL-FLAT
7723-4400
8mm, L, H
6.50x1.75-IDL-FLAT
6.50x2.75-IDL-FLAT
6.50x4.25-IDL-FLAT
6.50x5.75-IDL-FLAT
6.50x7.50-IDL-FLAT
7723-6175
7723-6275
7723-6425
7723-6575
7723-6750
14mm
14mm
14mm
14mm
14mm
Use
With
V-Belt
1-2 Strand 3V/3VX,
Up to 21mm (0.85”)
1 Strand A/AX
3-4 Strand 3V/3VX,
Up to 38mm (1.5”)
2 Strand A/AX
5-6 Strand 3V/3VX,
Up to 62mm (2.4”)
3 Strand A/AX
8 Strand 3V/3VX,
Up to 85mm (3.3”)
4 Strand A/AX
Up to 20mm
1 Strand B/BX
Up to 55mm
2-3 Strand B/BX
Up to 90mm
4-5 Strand B/BX
Up to 125mm
6 Strand B/BX
Up to 170mm
8 Strand B/BX
Width
Outside
Dia. (in)
Face
Width
(in)
A
(in)
B
(in)
C
(in)
D
(in)
4.25
1.25
1.13 1.13
.64
1.30 3.75 3/4-16
6304
5.20
4.25
2.00
1.50 1.13
.63
1.32 4.50 3/4-16
6306
7.50
4.25
3.00
1.50 1.13
.75
1.32 5.63 3/4-16
6306
10.60
4.25
4.00
1.50 1.13
.75
1.32 6.63 3/4-16
6306
13.60
6.50
6.50
6.50
6.50
6.50
1.75
2.75
4.25
5.75
7.50
2.00
2.00
2.38
2.38
2.38
6308
6308
6308
6308
6308
17.10
23.00
33.00
45.00
57.01
GATES INDUSTRIAL BELT PRODUCTS
E
(in)
1.50 1.04 1.96 5.69
1.50 .13 2.10 5.69
1.50 .13 1.98 7.06
1.50 .99 1.98 9.31
1.50 1.00 1.98 11.19
Thread Bearing Weight
Size
No.
(lb)
1-14
1-14
1-14
1-14
1-14
June 2012
IDLERS
Idler
Idler Bushings
Bushings
Idler Bushings
Idler Bushings
Part
PartNo.
No.
20-IDLR-BUSH(SK)
20-IDLR-BUSH(SK)
30-IDLR-BUSH(SF)
30-IDLR-BUSH(SF)
40-IDLR-BUSH(E)
40-IDLR-BUSH(E)
1610-IDLR-BUSH
1610-IDLR-BUSH
2012-IDLR-BUSH
2012-IDLR-BUSH
2517-IDLR-BUSH
2517-IDLR-BUSH
60
PM_Manual_Guts_2015.indd 60
Product
Product No.
No.
Style
7720-1120
7720-1120
20
7720-1130
7720-1130
20
7720-1140
7720-1140
7720-2610 20
7720-2610
7720-2012 20
7720-2012
7720-2517 20
7720-2517
20
Style
20
20
20
20
20
20
Size
SK
SF
E
1610
2012
2517
Size
SK
SF
E
1610
2012
2517
®
®
D
(in)
2.81
3.13
3.83
2.25
2.75
3.38
D
(In)
2.81
3.13
3.83
2.25
2.75
3.38
L
(in)
1.94
2.08
2.75
1.00
1.25
1.75
L
(In)
1.94
2.08
2.75
1.00
1.25
1.75
M
M (In)
(in)
1.44
1.44
2.13
2.13
2.19
2.19
1.38
1.38 1.56
1.56 1.56
1.56
Wt.
Bearing
Ea.
Threads Bearing
Number Weight (Lbs.)
Thread
Size
No.
(lb)
3/4-16
6304
11.00
3/4-16
6304
11.00
1-14
6206
8.60
1-14
6206
8.60
1-14
6306
8.62
1-14
6306
8.62
5/8-18
6003
1.30
5/8-18
3/4-16 6003 6204 1.30
2.30
3/4-16
3/4-16 6204 6304 2.30
3.90
3/4-16
6304
3.90
www.gates.com/drivedesign
12/16/14 12:07 PM
IDLER HARDWARE
Idler Sprockets
Poly Chain® GT® Carbon™ Idler Sprocket
Part
No.
12-IDL-SPRK
20-IDL-SPRK
21-IDL-SPRK
36-IDL-SPRK
37-IDL-SPRK
62-IDL-SPRK
68-IDL-SPRK
90-IDL-SPRK
125-IDL-SPRK
Product
No.
7720-1500
7720-1600
7720-1510
7720-1520
7720-1610
7720-1530
7720-1620
7720-1640
7720-1630
Use
With
8mm Pitch
14mm Pitch
8mm Pitch
8mm Pitch
14mm Pitch
8mm Pitch
14mm Pitch
14mm Pitch
14mm Pitch
Belt
Width
(in)
12
20
21
36
37
62
68
90
125
Number
of
Teeth
32
30
32
36
30
36
34
34
34
Pitch
Diameter
(in)
3.208
5.263
3.208
3.609
5.236
3.609
5.965
5.965
5.965
®
PM_Manual_Guts_2015.indd 61
®
B
(in)
1.25
2.55
1.25
1.91
2.55
1.91
3.38
3.38
3.38
C
(in)
.50
1.00
.50
.75
1.00
.75
.56
.31
.19
D
(in)
.85
1.36
1.24
1.86
2.06
2.91
3.33
4.20
5.63
www.gates.com/drivedesign
E
(in)
1.56
2.25
1.56
1.63
2.25
1.63
2.25
2.25
2.25
F
Threads
(in)
3/4-16
1-14
3/4-16
3/4-16
1-14
3/4-16
1-14
1-14
1-14
G
(in)
.94
1.00
.56
—
.25
.69
1.00
1.00
1.09
H
(in)
2.75
4.38
2.75
—
4.38
3.13
4.88
4.88
4.88
J
(in)
—
—
—
—
—
—
4.34
4.34
4.34
Bearing
No.
6304
6308
6304
6306
6308
6306
6310
6310
6310
Weight
(lb)
3.80
12.55
3.88
5.14
13.46
9.69
26.03
32.18
36.45
61
12/16/14 12:07 PM
IDLER HARDWARE
Flat Idler Pulley
Idler Brackets
Part
Product
Use
No.
No.
With
5-IDL-BRAK 7720-1005
1610-IDL-BUSH
10-IDL-BRAK 7720-1010 8mm Pitch Idler Sprockets
4.25” OD Flat Idler Pulleys,
2012-IDL-BUSH,
2517-IDL-BUSH,
20-IDL-BUSH (SK)
20-IDL-BRAK 7720-1020
14mm Pitch Idler
Sprockets,
6.50” OD Flat Idler Pulleys,
30-IDL-BUSH (SF),
40-IDL-BUSH (E)
A
(in)
4.62
4.63
B
(in)
3.50
3.50
C
(in)
1.75
1.75
D
(in)
2.00
2.00
E
(in)
2.06
2.06
F
(in)
3.06
3.06
G
(in)
.38
.38
H
(in)
1.63
1.50
J
(in)
.62
.63
M
Threads
(in)
5/8-18
3/4-16
N
(in)
1.16
1.00
P
(in)
1.77
1.88
Q
(in)
1.94
1.75
Weight
(lb)
2.80
3.40
6.94
5.25
2.63
5.00
3.00
4.56
.63
2.38
1.00
1-14
1.63
2.94
2.75
11.20
Nickel Plated Idler Brackets
Part
Product
No.
No.
NP-10-IDL-BRACKET 7720-1011
NP-20-IDL-BRACKET 7720-1021
62
PM_Manual_Guts_2015.indd 62
Use
With
8mm Pitch Idler
Sprockets
2012-IDL-BUSH,
2517-IDL-BUSH,
20-IDL-BUSH (SK)
14mm Pitch Idler
Sprockets,
30-IDL-BUSH (SF),
40-IDL-BUSH (E)
A
(in)
4.63
B
(in)
3.50
C
(in)
1.75
D
(in)
2.00
E
(in)
2.06
F
(in)
3.06
G
(in)
.38
H
(in)
1.50
J
(in)
.56
M
Threads
(in)
3/4-16
N
(in)
1.00
P
(in)
1.88
Q
(in)
1.75
Weight
(lb)
3.40
6.94
5.25
2.63
5.00
3.00
4.56
.63
2.38
1.00
1-14
1.63
2.94
2.75
11.20
®
®
www.gates.com/drivedesign
12/16/14 12:07 PM
DRIVE SURVEY WORKSHEET
High Speed Drive Survey and Energy Savings Worksheet
CUSTOMER INFORMATION
Distributor_______________________________________________________________________________________________
Customer________________________________________________________________________________________________
DRIVE INFORMATION
I.D. of Drive (location, number, etc.)__________________________________________________________________________
Description of DriveN Equipment___________________________________________________________________________
Manufacturer of DriveN Equipment_________________________________________________________________________
Horsepower Rating of Motor _______________ DriveN HP Load (Peak) _________________ (Normal) ______________
Motor Frame Size _______________ Motor Shaft Dia. _______________ DriveN Shaft Dia. ___________________
Speed:
DriveR RPM _______________ __________________ RPM Measured with Contact or Strobe Tachometer  Yes
 No
DriveN RPM ________________________________ RPM Measured with Contact or Strobe Tachometer  Yes
 No
Speed Ratio _______________
Speed Up _______________________ or Speed Down ___________________
Center Distance: Minimum _______________ Nominal ____________________ Maximum ________________________
Existing Drive Components: DriveR _______________________________ DriveN _______________________________
Belts ________________________________________ Belt Manufacturer _____________________________________
Ambient Conditions:
Temperature _________________ Moisture _____________________ Oil, etc. _______________________________
Abrasives __________________________________________________
Static Conductivity Required?
 Yes
Shock Load ___________________________
 No
Maximum Sprocket Diameter (OD) and Width Limitations (for guard clearance):
DriveR: Max. OD __________ Max. Width ___________ DriveN: Max. OD ___________ Max. Width ____________
Guard Description _____________________________________________________________________________________
Motor Mount:
Double Screw Base?
 Yes
 No
Motor Mounted on Sheet Metal?
Adequate Structure?
 Yes
 No
Floating/Pivot Motor Base?
 Yes
 Yes
 No
 No
Start Up Load:
%Motor Rating at Start Up __________ AC Inverter?  Yes
 No
Soft Start?  Yes
 No
Duty Cycle:
Number of Starts/Stops _________________________ times per _______________________ (hour, day, week, etc.)
ENERGY SAVINGS INFORMATION
Energy Cost per KW-Hour _________________________________________________________________________________
Hours of Operation: ______ Hours per Day
______ Days per Week
®
PM_Manual_Guts_2015.indd 63
®
______ Weeks per Year
www.gates.com/drivedesign
63
12/16/14 12:07 PM
DRIVE
SURVEY
WORKSHEET
DRIVE
SURVEY
WORKSHEET
Low
SpeedDrive
Drive Design
Design Information
Low
Speed
InformationSheet
Sheet
For Drive Selections with Shaft Speeds Less Than 500 rpm
Distributor:
Drive Layout
Customer:
(check one)
Drive Identification (location, number, etc.)
Motor Reducer Belt
Drive Driven
DriveR Information:
Motor Nameplate Data
Rated Horsepower =
Rated RPM =
Efficiency =
Rated Voltage =
Rated Amps =
Rated Torque =
Actual Motor Load =
Motor Type:
AC
DC
Gear Motor
Constant
Output Speed:
Variable
Reducer Information:
Belt Drive on Reducer
Output Shaft
Reducer Type (worm, right angle helical, cycloidal, etc):
Reducer Efficiency =
Output RPM =
Rated Input HP/Torque =
Reducer Ratio =
Rated Output HP/Torque =
Existing Drive Information:
Drive Type:
Chain
If chain, type; 2/#60. #80, etc.
V-Belt
Synchronous Belt
Lubed
Unlubed
Current Drive Service Life =
DriveR Sprocket/Sheave =
(teeth/OD)
DriveR Shaft Diameter =
DriveN Sprocket/Sheave =
(teeth/OD)
DriveN Shaft Diameter =
+
Center Distance =
Motor Belt Drive
Reducer Driven
-
Type of Center Distance Adjustment:
Idler used:
Yes
No
Inside
Backside
DriveN Information:
Type of Equipment:
Actual Horsepower Required =
DriveN RPM =
Hours/Day =
Days/Week =
Weeks/Year =
Special Requirements:
Space Limitations:
Maximum DriveR Dia. =
Maximim DriveN Dia =
Maximum DriveR Width =
Maximum DriveN Width =
Environmental Conditions:
Temperature Range =
Oil Mist
64
Belt Conductivity Required
Oil Splash
Moisture
®
Abrasives
Belt Drive on Reducer
Input Shaft
www.gates.com/drivedesign
62
PM_Manual_Guts_2015.indd 64
®
12/16/14 12:07 PM
DRIVE SURVEY
DRIVEWORKSHEET
SURVEY WORKSHEET
Gates
IQ IQ
Data
Worksheet
GatesDesign
Design
Data
Worksheet
Account:
Address:
Contact:
Title:
Phone:
E-mail:
Fax:
Application Summary
General Description:
Product Type:
Prototype Schedule:
Production Volume:
Production Time Schedule:
Design Parameters
DriveR:
Motor Type & Description:
Nominal Motor Torque / Power Output:
Max / Peak Motor Torque/Power Output:
Motor Stall Torque (If applicable):
DriveN's / Idlers:
Description
Driver
(Servo, Stepper, DC, AC, etc.)
Reversing:
(Y/N)
rpm:
rpm:
(CW / CCW / Rev)
Driver Rotation:
(Specify appropriate units for each field; in, mm / hp, kw / lb-ft, lb-in, N-m, etc.)
X
Y
Pulley
Diameter
Sprocket
Grooves
Pitch
Inside/
Outside
rpm
Load
Conditions
(driven) Units # % Time
Shaft
Diameter
Note: For complex drive layouts use additional pages as needed
Drive Sketch
Slot Movement:
Idler Details
Min Position
X
Y
Max Position
X
Y
Pivot Point
X
Y
Movement Angle
Min Deg Max Deg
Spring:
Pivoting Movement:
Spring:
Pivot Arm Radius:
(in/mm):
Special Requirements
Product Design Life:
Pulley Materials:
Prototype
Belt Construction Considerations:
Temperature:
Moisture:
Special Requirements:
Belt Life:
Hours/Day:
Production
Oil:
Static Dissipation:
Hours/Year:
Abrasives:
Page
®
www.gates.com/drivedesign
Of
65
63
PM_Manual_Guts_2015.indd 65
®
12/16/14 12:07 PM
TRADEMARKS
•HT100®, Taper−Lock® and Ringfeder® are registered trademarks of Reliance Electric.
•Nu−T−Link® is a registered trademark of Fenner Manheim.
•QD® is a registered trademark of Emerson Electric.
•RPP® and Panther® are registered trademarks of Carlisle Power Transmission Products, Inc.
•KEVLAR® is a registered trademark of E. I. du Pont de Nemours and Company.
•Goodyear®, BlackHawk PdTM, Poly−V® and Flexten® are registered trademarks of Goodyear Tire
& Rubber Company.
•Browning® is a registered trademark of Emerson Power Transmission Manufacturing L.P.
•Dayco® is a registered trademark of Dayco Products LLC.
• TB Wood’s® and QT Power Chain® are registered trademarks of T.B. Wood’s, Inc.
•Trantorque® is a registered trademark of BTL, a subsidiary of Fenner PLC.
WARRANTY
Gates warrants that its power transmission products will be free from defects in materials and
workmanship for the life of the product. If the product does not meet this standard, Gates will
repair or replace the product free of charge!
Please note that this warranty is customer’s exclusive remedy and does not apply in the event
of misuse or abuse of the product. Gates disclaims all other warranties (express or implied)
including the implied warranties of fitness for a particular purpose and merchantability.
For further details of the Gates Warranty, please see www.gates.com/warranty.
66
PM_Manual_Guts_2015.indd 66
®
®
www.gates.com/drivedesign
12/16/14 12:07 PM
RESOURCES
Free design and maintenance resources from Gates:
Design Flex Pro – gates.com/designflex
Design Flex Mobile – gates.com/dfmobile
Design IQ – gates.com/designiq
PT Toolkit Mobile App – gates.com/pttoolkit
Part View eCatalog and CAD library – gates.com/partview
Energy Savings Calculator and other resources – info.gates.com/Preventive-Maintenance
For Engineering Support and more, visit gates.com/drivedesign
®
PM_Manual_Guts_2015.indd 67
®
www.gates.com/drivedesign
12/16/14 12:07 PM
BELT DRIVE
Preventive Maintenance + Safety
PROPER INSTALLATION + PREVENTIVE MAINTENANCE PROCEDURES
improve workplace safety, reduce downtime, and increase production.
The majority of mechanical power transmission drive problems
are attributed to improper component maintenance and installation.
This thorough textbook provides in depth guidance to avoid these issues
to improve drive performance. Ideal for facility personnel responsible for
power transmission equipment, the Gates Belt Drive Preventive Maintenance
Manual covers the following topics:
Sources of Drive Problems
Preventive Maintenance
Safety
Drive Inspection
Installation
Storage + Handling
Belt Types + Identification
Sprocket Corrosion Prevention
Troubleshooting
GATES CORPORATION powers progress by providing quality products and expert support
to help you increase production, avoid downtime, decrease maintenance, and manage
energy costs. Gates invented the V-belt in 1917, and continues to lead the industry with
product innovations and unmatched engineering support to improve power transmission
efficiency, reliability, and economy.
Gates offers onsite Preventive Maintenance training. To schedule training or to learn more,
contact an authorized Gates distributor.
GATES CORPORATION
www.gates.com/pm
©2015 GATES CORPORATION
14995 1/2015
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