SAFETY NOTICE
4
NEW AXLE SETUP
4
MAINTENANCE SCHEDULE
4
BEFORE EACH USE
3 MONTHS OR 3,000 MILES
6 MONTHS OR 6,000 MILES
12 MONTHS OR 12,000 MILES
4
4
4
4
AXLE IDENTIFICATION
5
STANDARD LABEL
SERIAL LABEL
5
5
LOADING AND APPLICATION
6
LEVELNESS & DISTRIBUTION
TORSION AXLES
WEIGH IN
THIS POSITION 2 SHOWS HOW TO DETERMINE THE LOAD ON EACH AXLE.
6
6
7
7
TRAILER ELECTRICAL
8
BRAKE SYNCHRONIZATION
WIRING SCHEMATIC 7 WAY
9
10
ELECTRIC BRAKES
11
THEORY OF OPERATION
BRAKE SPECIFICATIONS
BRAKE SHOE INSPECTION
11
11
12
DISC BRAKES
13
THEORY OF OPERATION
BRAKE SETUP AND USE
13
14
HUBS & DRUMS
15
DRUM IDENTIFICATION
DRUM INSPECTION
15
15
BEARINGS
16
2
BEARING MAINTENANCE
HUB REMOVAL
SEAL REMOVAL & INSTALLATION
BEARING INSPECTION
RACE (BEARING CUP) REMOVAL & INSTALLATION
BEARING INSPECTION
BEARING INSTALLATION & ADJUSTMENT
16
16
16
16
17
17
17
LUBRICATION
17
OIL
GREASE
GREASE PACKING BEARINGS
18
18
18
SUSPENSIONS
18
AIR RIDE AXLES & OTHER TYPES.
SLIPPER SPRINGS
TORSION EQUALIZER AXLES
INSPECTION & REPLACEMENT
SPRING REPLACEMENT
EQUALIZER REPLACEMENT
18
18
18
19
19
19
WHEELS & TIRES
20
STORAGE & INFREQUENT USE
21
STORAGE PREPARATION
AFTER STORAGE
21
21
TORQUE REQUIREMENTS
22
OIL & GREASE SPECIFICATIONS
22
GREASE
OIL
22
23
PARTS LISTS
23
10K
12K
16K
23
24
26
TROUBLESHOOTING
27
BRAKING
HUBS & BEARINGS
27
30
3
SUSPENSION
31
SALES & SERVICE
32
TECHNICAL SUPPORT
33
WARRANTY
33
NOTES:
34
4
Safety Notice
Providing safe dependable operation of your axle(s) and related components is important. This manual
provides basic procedures for service and repair using established industry standards and techniques.
There are many variations in procedures to repair and maintain your axle(s) and its related parts;
however, it is not possible to provide you with all the details for various service procedures. Refer to your
trailer manufacturers’ owners manual for any specific warnings and procedures that may relate to the
safety and maintenance of your trailer. If these procedures are not clear to you or if you are unsure of
how to proceed you should contact a trailer repair facility who has a trained axle repair technician for
advice or repair.
THIS SYMBOL WARNS OF
POSSIBLE PERSONAL INJURY
This symbol indicates a torque
requirement, please see page 22.
New axle setup
Lug Nut Torque
Brake Adjustment
Tire pressure
Brake Synchronization
Re-torque lug nuts on new trailers at 25, 50 miles. See pages 20 and 21 for
torque requirements and techniques
All 10K, 12K, and 16K brakes are self adjusting. The brakes will automatically
adjust as needed regardless of direction of travel.
See tire manufacturer's recommendations
Refer to Brake Controller manufacturer’s recommendations.
Maintenance Schedule
Lug nuts should be checked periodically after initial setup period.
Before Each Use
•
•
•
Test that brakes are functional
Check battery charge and switch operation of breakaway systems.
Check that tire inflation meets VIN pressure.
3 Months or 3,000 Miles
•
Wheels should be checked for cracks, dents, or other distortions.
6 Months or 6,000 Miles
•
•
•
Brake magnets should be checked for wear and current draw.
Brake controller should be checked for correct modulation and amperage.
Suspension parts such as the springs, equalizers, hangers, and fasteners should be checked for bending, loosening, and
excessive wear.
12 Months or 12,000 Miles
•
•
•
•
•
•
•
•
•
Brake linings should be checked for wear and contamination.
Brake cylinders (hydraulic) should be checked for fluid leaks or sticking.
Brake lines (hydraulic) should be checked for and cracks, leaks, or kinks.
Wiring should be checked for bare spots, fraying, etc.
Drums should be checked for abnormal scoring and excessive wear.
Wheel bearings and races should be checked for corrosion ad wear.
Seals should be checked for leakage.
Springs should be checked for wear and loss of arch.
Welds should be inspected on the hangers.
5
Axle Identification
Rockwell American offers many different combinations and capacities of axles. In order to identify your
axles you will need to locate the axle identification label on your axle beam. The labels will appear similar
to the one below.
Standard Label
Part Number
Batch Number
Description
The standard axle label can found on most axle assemblies and beams. With this information your axle
can easily be identified by any of our distribution locations or technical support. Basic specifications can
be determined by the three line short description.
Serial Label
In addition to a standard label DOT requires that all axles rated at 10,000 lbs and above have a serialized
identification label on them. There are two styles of serial labels. The newer style is shown below. It is a
3x2 adhesive tag.
Serial Number
The second, older style is a 3x1 metal plate that is riveted onto the axle.
Serial number information will be required for all warranties.
6
Loading and Application
GAWR vs. GVWR
An easy way to determine the carrying capacity of your axles is to locate the Vehicle Identification
Number tag on your trailer. It would appear similar to the one below.
THIS VEHICLE CONFORMS TO ALL APPLICABLE FEDERAL MOTOR SAFETY
STANDARDS IN EFFECT ON THE DATE OF MANUFACTURE SHOWN ABOVE
Often the VIN tag will list each axles rated capacity
separate. The capacity will be listed as the GAWR
(Gross Axle Weight Rating). The total capacity of the
trailer is will be listed as the Gross Vehicle Weight
Rating (GVWR). Often this will include the “tongue
weight” and therefore cannot be relied upon to
determine the axle capacity.
Levelness & Distribution
It is important when towing the trailer that several factors are taken into account. The first is the
levelness of the trailer. The trailer should be level to the ground. If the hitch is too high or too low one
axle will be given more of the load and the overall center of gravity will be changed. Failure to properly
level the trailer can result in anything from poor braking performance, pre-mature tire wear, to decreased
bearing life. See the illustration.
The distribution of the load on the trailer is also a factor.
If one axle carries a load higher than its rate GAWR, that
axle will be more likely to suffer from tire wear and
bearing problems. It cannot be assumed that if the load is
less than the GVWR that an axle will not be overloaded.
Note:
When loading the trailer it is important
that the weight being place on the axle
does not exceed that axle’s rated capacity. This is
important on rear loading trailers where the back axle
may briefly carry the entire load.
Example:
A tandem trailer with two 10,000 lb rated axles being loaded with a 12,000 lb piece of machinery may
exceed the rating of the rear axle.
Torsion axles
Torsion axles have independent suspensions. The loading of the trailer as well as the road conditions can
be factors in the lifespan of the axle and its components. Severely uneven terrain such as those found in
mining, oil fields, and exploration sites can cause severe shock loads and overload situations capable of
bending the axle’s spindle, and causing bearing failure. It is important for the life of the axle that the load
be evenly distributed and that all tires maintain contact with the ground while the trailer is loaded.
7
Weigh in
The best way to verify that a given load is properly distributed as well as ensure that the GAWR has not
been exceeded is to the weigh the trailer at a truck scale. The Position 1 below shows how to determine
the combined axle load.
This Position 2 shows how to determine the
load on each axle. The rear axle’s load will be
provided on the weigh slip for Position 2. The
front axle’s can be determined by subtracting
the combined load from the rear axle load.
Position 1
Position 2
Front Axle = AxleWeight (Position 1) − AxleWeight (Position 2)
Rear Axle = AxleWeight ( Position 2 )
This method can be slightly modified to determine the distribution and weight on tri-axle assemblies. As
shown below.
Position 1
Position 2
Position 3
Front Axle = AxleWeight ( Position 1) − AxleWeight ( Position 2 )
Mid Axle = AxleWeight ( position 2 ) − AxleWeight ( position 3)
Rear Axle = AxleWeight ( Position 3)
8
Trailer Electrical
9
If equipped with electric brakes, the diagrams below will be helpful in determining the type of connector
installed on the trailer as well as a schematic of the pin connections. Detailed schematic is shown on page
10.
6 Pole Diagram
Truck Side
Trailer Side
7 Pole Diagram
Truck Side
Trailer Side
These diagrams represent the most common configurations found on trailers with electric brakes. 4 and 5
way trailer connections are not normally used on trailers with electric brakes. These configurations do not
have a dedicated brake wire.
Wiring gage is also important when using a trailer with electrical brakes. Use of the improper gage of wire
can result in decreased brake performance.
Number
of
Brakes
2
4
4
6
6
Trailer Hitch to
Axle
All Lengths
Less than 30 feet
30-50 feet
Less than 30 feet
30-50 feet
Minimum
Wire size
12 AWG
12 AWG
10 AWG
10 AWG
8 AWG
Brake Synchronization
It is important to ensure that the trailer brakes are properly synchronized to the tow vehicle brakes. This
is necessary for the brakes to operate as designed as well as prevent pre-mature wear of the brake
components.
Refer to Brake Controller manual
provided by the installer for procedure
and operation of the controller
10
Wiring Schematic 7 Way
11
Electric Brakes
If equipped, your trailer’s electric brakes are actuated by an electromagnet which is controlled by the
electrical impulses from the brake controller. The trailer brakes will apply smoothly and slightly ahead of
the truck brakes if all the brake components are installed and connected properly.
Right hand 10K brake Shown
Theory of Operation
When electrical current is sent to the
magnets the activated magnet will contact
the rotating armature surface of the brake
drum. This contact moves the actuating
arm against the cam above the anchor pin.
This forces the primary shoe to engage.
Pressure from the primary shoe will be
transmitted through the adjuster linkage
and engages the secondary shoe. As brake
pressure (applied by the driver) is increased,
the electrical flow to the magnets increases the pressure between the brake linings and drum. As the
linings wear the brake will automatically adjust to the proper setting.
Brake Specifications
Brake
Pri. Lining Code
12.25x3.5 GG
Sec. Lining
Amperage
GG
3.2-3.5
12.25x5 GG
GG
2.5-3.5
Note: Specifications subject to change without notice. Linings are Semi-Metallic.
The GG lining code used on your brakes provides both a static and dynamic coefficient of friction of 0.5.
This friction is 20% higher than the common FF linings therefore your brakes will provide superior
stopping power, but also generate more heat.
The amperages listed above are measured at 12 volts DC. Your amperage may be measured by using the
formula:
Amperage ≅ Voltage (at magnet ) 4
Both outside temperature and use can affect the amperage. Under constant load the amperage will
decrease slightly. This is not uncommon and it should return to normal after cooling.
12
Brake Installation
All electric brakes should be installed using Grade 8 bolts. I. The OEM bolt torque
specifications are shown on page 22.
Note: when installing brakes the magnet wire should always be to the rear of the axle.
Once the brake is bolted to the axle the wires should be connected using butt connectors. There is no
polarity so either wire can be connected to the ground wire.
Brake Shoe Inspection
Periodic inspections of the brake shoes should be done to check for wear. This preventative check will
help to prevent further damage to the brake system. When working with brake shoes wear appropriate
breathing protection to avoid inhaling the brake dust.
•
A normal wear pattern is for the rear pad to be slightly more worn than the front pad.
Additionally the brake should appear to have more wear near the middle
of the shoes.
•
Some heat cracking in the pads is normal. And is not a cause for concern.
Acceptable Cracks
If the brake shoes are glazed in appearance, they may be roughed up by using a wire brush and rough grit
sand paper.
Brake shoes should be replaced if:
• The pads are oily or soaked in grease
th
•
Less than ⅟16 ” of lining remaining.
•
The shoe (metal portion) itself appears to be bend or worn.
•
•
The linings should be inspected for any evidence of separation from the shoe backing.
There are deep gouges or grooves cut into the pad material.
Brake shoes should always be replaced in pairs. This will help ensure that the braking system is uniform.
After a shoe replacement repeat the burnish process as indicated on page 14.
Replacement Shoe Kits
Brake Size
Shoe Kit Part Number
12.25x3.5
4738-2(Left)/3 (Right)
12.25x5
4741-2(Left)/3 (Right)
13
Magnet Inspection
Periodic inspections of the brake magnet should be done to check for
abnormal wear or damage. This preventative check will help to prevent
further damage to the brake system. A straight edge will aid in this
inspection.
Normal Wear
If any of the coils are visible replacement of the magnet is required. In
addition to the visual inspection it is recommended to check the current
draw of the magnets as well. Amperage ranges are listed on page 11.
Uneven Wear
Replacement Magnet Kits
Brake Size
Magnet Kit
12.25x3.5
4738-23
12.25x5
4738-23
Disc Brakes
If equipped with electric over hydraulic disc brakes, your brakes are actuated by hydraulic fluid line
pressure provided by the hydraulic actuating unit. This unit is controlled by the electrical impulses from
the brake controller. The trailer brakes will apply smoothly and slightly ahead of the truck brakes if all the
brake components are installed and connected properly.
Theory of Operation
Rockwell American axles with disc brakes
utilize a floating caliper design. When the
actuating unit provides pressure to the
piston, the piston forces the inner friction
pad against the rotor surfaces (rotor not
shown for clarity). As the pressure builds
the caliper will slide along the guide bolts
and cause the outer friction pad to also
contact the rotor. This clamping pressure
forces the rotor to stop turning. It is
important that the actuating unit and
brake controller be rated for the disc
brake application.
For more information on disc brakes visit www.Kodiaktrailer.com
14
DOUBLE CHECK
•
•
•
Make sure your controller is installed according to the manufacturer’s recommendations
Make sure that the proper brake controller adjustments have been made to correctly engage the
tow vehicle brakes and the trailer brakes to work together providing safe and comfortable
braking.
Make sure the trailer brakes are grounded properly to the tow vehicle.
Brake Setup and Use
Burnishing-Burnishing is necessary to ensure proper seating and wear in of the brake components.
Burnishing is accomplished by applying the trailer brakes to reduce the vehicle speed by 20 mph
20-30 times. For example: reduce speed from 40 mph to 20 mph. Allow ample time between
burnish snubs to allow brake to cool and prevent glazing. This should be done in a low traffic area for
safety.
Adjustment-the OEM Electric brakes standard on our 10,000 lb capacity and above axles are self
adjusting. If the adjuster is not functioning as desired, adjusting the brakes manually is an option.
This can be done by turning the star on the brake adjuster.
FAILURE TO PROPERLY LIFT AND SECURE
TRAILER MAY CAUSE PERSONAL INJURY OR
DEATH.
1) Lift trailer and secure on jack stands. Please follow the trailer manufacturer’s guidelines on lifting
locations.
2) Remove the rubber plugs behind the adjuster wheel.
3) Using a flat headed screw driver press the lower adjuster lever outward so that it will not prevent
adjustment.
4) Using a brake spoon or screwdriver adjust the brakes so that they expand and the wheel no
longer spins.
5) Adjust the brakes inward so that a slight drag is present.
6) Repeat on remaining wheels and lower trailer.
15
Hubs & Drums
Drum Identification
Axle hubs are generally broken down into categories based on axle capacity and hub pilot. There are two
different hubs available on 10,000lb and 12000 lb axles
Available Hubs
Capacity
Available wheel Pilots
Bolt Circle
10K
4.75”
8 on 6.5”
10K
4.88”
8 on 6.5”
12K
4.75”
8 on 6.5”
12K
4.88”
8 on 6.5”
An additional two combinations are solely available on 16,000 lb capacity axles. Since each of these hubs
has a different profile, they are not interchangeable on the axle. You cannot convert from one bolt
pattern to the other
Available Hubs
Capacity
Available wheel Pilots
Bolt Circle
16K
221 mm
8 on 275mm
16K
6.50”
10 on 8.75”
FAILURE TO USE THE PROPER WHEEL PILOT CAN
RESULT IN WHEEL SEPERATION AND PERSONAL
INJURY OR DEATH.
Drum Inspection
Periodic drum inspection should be done to check for wear. The two surfaces that are to be checked are
the brake shoe contact area and the armature surface of the drum. These surfaces should be checked for
uneven/excessive wear and abnormal scoring or gouging.
For the shoe contact area, if any drum is worn more than 0.020” oversized or 0.015” out of
round (measured as total indicator run-out), the drum should be resurfaced. If the drum has
worn to a diameter of more than 12.340” or after resurfacing would be more than 12.340” the
drum would need to be replaced.
The armature surface (magnet contact area) needs to be resurfaced if the worn unevenly. Do
not remove more than 0.030” from this surface. After resurfacing the surface finish should be
no more than 120 micro inches. If the armature surface is refinished the magnets must also be
replaced to prevent further damage. On 10,000 axles the armature surface is separate from the drum and
can be replaced.
16
•
Inspect and clean hub cavity to ensure all metal shavings have been removed.
Bearings
Rockwell American uses industry standard tapered roller bearings in our axles. The use of tapered roller
bearings, as opposed to ball bearings, helps reduce axial endplay and is essential to good performance
and long bearing life.
Bearing Maintenance
Axle bearings should be checked periodically to extend bearing life. This will also help catch major
problems before they happen. In order to check the bearings the hub/drum must be removed. Simply
injecting more grease or oil into the axle will not prevent all problems.
FAILURE TO PROPERLY LIFT AND SECURE
TRAILER MAY CAUSE PERSONAL INJURY OR
DEATH.
Hub Removal
1.
2.
3.
4.
5.
6.
7.
Lift trailer and secure on jack stands. Please follow the trailer manufacturer’s guidelines on lifting
locations.
After securing and lifting the trailer remove the wheels.
Remove the plastic oil cap using the appropriate socket, pliers, or wrench.
Remove the cotter pin.
Remove the spindle nut using a 2 ¼ socket (10,000 lb axles) or a 2 ⅝ socket (12,000lb-16,000lb
axles).
Remove spindle washer
Using a hub puller remove the hub from the axle. (The seal may make removal difficult
otherwise) The seal may separate.
Seal Removal & Installation
The seal must be replaced after each removal to prevent failure.
1.
2.
3.
4.
Pry the seal out of the hub using a screwdriver. Take care to avoid
scratching the sealing surface of the hub or the inner bearing.
If the inner rubber portion of the seal remains on the spindle pry off using
pliers. Take care not to scratch or damage the spindle. Crocus cloth may
be used to polish spindle if necessary.
Tap the seal into place using a wood block or seal installation tool.
DO NOT use sealant on seal surfaces.
Bearing Inspection
Cleaning the bearings thoroughly will make inspection easier. Use a lint free cloth to dry.
1.
2.
Inspect inner ring for wear, corrosion, or excessive heat.
Inspect individual rollers by rolling in hand for pitting, spalling, or corrosion. Do not spin using
compressed air
17
3.
4.
Check cage for cracks or other damage.
If any of the above damage is found the replace bearing and corresponding race.
Race (bearing cup) Removal & Installation
It is important that bearings and races be replaced in pairs to avoid pre-mature failure.
1.
2.
3.
4.
Place the hub on a flat surface with the race to be removed facing downward.
Using a soft brass punch tap around the top surface of the race until the race is dislodged, taking
care not to damage other surfaces.
Clean hub thoroughly to ensure that no metallic flakes or lint is left inside the hub.
Install the new race by tapping in with a soft brass punch. Verify that the race is seated fully in
the hub.
Bearing Inspection
1.
2.
Inspect raceway for wear, corrosion, or excessive heat.
If any damage is found replace the race and corresponding bearing.
Bearing Installation & Adjustment
Once the components have been replaced the following procedures must be done to complete
installation. If your hubs are grease packed, repack prior to installation. See page 18.
FAILURE TO PROPERLY INSTALL THE SPINDLE
NUT CAN RESULT IN WHEEL SEPERATION AND
PERSONAL INJURY OR DEATH.
1.
Install hub onto axle once inner bearing and seals have been installed. Take care not to
damage the inner seal on the threads
2. Install the outer bearing by sliding it over the spindle.
3. Install the spindle washer.
4. Start the spindle nut by hand
5. Tighten the spindle nut using a 2 ¼ socket (10,000 lb axles) or a 2 ⅝
socket (12,000lb-16,000lb axles).
6. Using a torque wrench torque the spindle nut to 100 ft-lbs.
7. Back the spindle nut off ¼ of a turn and align the cotter pin hole with the
spindle nut.
8. Insert the cotter pin.
9. Tighten the plastic oil cap to 30 ft-lbs.
10. Refill with oil (if equipped).
11. Re-install wheels per instructions on page 20 and 21.
Lubrication
Rockwell American offers two types of bearing lubrication on these assemblies. In addition to checking
during bearing inspection and replacement it is important to routinely check the lubrication in your hubs
18
Oil
If equipped with oil bath hubs (clear caps) the oil level should reach the fill line on the cap after the trailer
has been stationary and the oil has pooled. Overfilling the hub does not provide extra protection. Oil may
be added by removing the rubber plug.
It is recommended that only high quality non-synthetic SAE 80-90w gear oil be used to refill oil bath axles.
The OEM oil is red in color to aid in visibility. See page 23 for oil specifications and recommended sources.
Grease
If equipped with greased hubs (blue caps) the condition of the grease should be checked to ensure proper
bearing life.
It is recommended that only high quality NLGI 2 grease be used to repack bearings. See page 22 for grease
specifications and recommended sources.
Grease Packing Bearings
Hand pack each bearing by hand or use a bearing packing tool. To pack by hand do as follows:
1.
2.
3.
4.
Place grease into the palm of your hand.
Press and work grease in between the individual rollers. This is done more easily by forcing
through at the widest side of the bearing.
Repeat for each roller taking care to rotate the bearing as this is being done. The entire bearing
should be full of grease.
Liberally coat the race (bearing cup) with grease.
Suspensions
With most axles of these capacities Quality also provides the suspension system as well as the axle. These
components are designed to perform a number of tasks and to provide your trailer with the best and
smoothest towing possible. Not all types of suspension are available on all axles.
Air Ride Axles & Other Types.
Please refer to the trailer manufacturer for details.
Slipper Springs
The most common type of undercarriage is the slipper spring configuration. These axles are installed in
single, tandem, spread, or triple configurations. Slipper springs have an eye only at one end which
contains a rubber bushing to aid in wear. The trailing end of the spring is designed to slide against the rear
hanger.
Torsion Equalizer Axles
Your trailer may be equipped with our Equalizer axles. These axles rely on a rubber suspension with
superior dampening characteristics to provide a smooth reliable ride. They are designed to meet
19
individual customer requirements. This is a self contained system and should not be modified. These
axles should be bolted to the frame using the brackets. Secondary attaching brackets are provided per
customer request.
Inspection & Replacement
It is important to periodically check the suspension components of the slipper spring axles to ensure that
they are not worn. Any components with excessive wear or damage should be replaced.
Front of Trailer
Spring Replacement
To remove the springs or any spring component please refer to the instructions below.
FAILURE TO PROPERLY LIFT AND SECURE
TRAILER AND SUSPENSION MAY CAUSE
PERSONAL INJURY OR DEATH.
1.
2.
3.
4.
5.
6.
Once the trailer is properly lifted and secured place a jack stand or block under the axles near the
ends to be repaired. These rests are only to support the axles and suspension and will remove
the load from them. They do not support the trailer.
Remove the u-bolt nuts and dissemble the u-bolts and tie plates from the axle.
Remove the eye bolts from the spring and slide the spring out.
If only the eye bushings are to be replaced use either a c-clamp or vice to press the worn bushing
out.
Installation of the new bushing is the reverse of removal.
Installation of the spring is the reverse of removal. See torque specification on
page 22 for component requirements.
Equalizer Replacement
To remove the equalizer bar or any equalizer bar component please refer to the instructions below.
FAILURE TO PROPERLY LIFT AND SECURE
TRAILER AND SUSPENSION MAY CAUSE
PERSONAL INJURY OR DEATH.
20
1.
2.
3.
4.
5.
6.
Once the trailer is properly lifted and secured place a jack stand or block under the axles near the
ends to be repaired. These rests are only to support the axles and suspension and will remove
the load from them. They do not support the trailer.
Remove the spring eye bolts and equalizer bolts.
Remove the equalizer bar.
If only replacing the equalizer bushings use either a c-clamp or vice to press the worn bushings
out.
Installation of the new bushing is the reverse of removal.
Installation of the equalizer is the reverse of removal. The equalizer bolt utilizes
a lock nut which should be replaced. See torque specification on page 22 for
component requirements.
Wheels & Tires
Torque values on lug nuts are required and adhering to the proper torque values and schedule is of the
utmost importance. Also of extreme importance is the selection of the proper wheel mounting pilot
diameter on hub piloted wheels.
1.
2.
3.
4.
5.
Mount wheels
Start all nuts by hand to prevent cross threading and other damage.
After all lug nuts have been “snugged”, tighten the nuts to the recommended torques using
patterns shown on the following pages and in the stages below. Take note to select the proper
mounting type.
Nuts should be tightened in stages of 20% of final torque, 50%, and 100%.
Check and re-torque nuts after 25, 50 miles, and then periodically.
FAILURE TO PROPERLY TORQUE LUG NUTS
CAN RESULT IN PERSONAL INJURY OR DEATH.
FAILURE TO SELECT PROPER WHEEL PILOT
CAN RESULT IN PERSONAL INJURY OR DEATH.
8 on 6.5"
2 piece flange nut
Torque (ft-lbs):
130-170
Standard 10K-12K system
8 on 6.5"
Clamp ring w/cone nut
Torque (ft-lbs):
175-225
Optional 10K-12K system
21
8 on 275mm
2 piece flange nut
Torque (ft-lbs):
450-500
Available 16K system
10 on 8.75”
2 piece flange nut
Torque (ft-lbs):
450-500
Available 16K system
Storage & Infrequent Use
Prolonged or even short term storage can affect multiple wear items on the trailer. The most common
items affected are seals, bearings, and tires.
Oil bath axles need to be moved in order allow the oil to fully lubricate the bearings. It is highly
recommended that the hubs be rolled at least once every two weeks to prevent oil pooling and oxidation
on the bearings.
Storage Preparation
1.
2.
Follow the trailer manufacturer’s guidelines for lifting and supporting the trailer in order to
remove the load from the trailer tires. Do not place supports on axle beams.
If axle has been immersed in water, remove the hubs clean and lubricate bearings and re-install.
After Storage
3.
4.
Inspect the suspension system, for worn bushings and loose bolts.
Remove drums and check for wear and remove any oxidation with emery cloth.
22
5.
6.
7.
8.
Inspect brake assembly for cracked linings, worn magnets, free movement of parts, and
oxidation. Clean and replace as necessary.
Remove seal and inspect bearings and races.
Replace seal and complete re-assembly of drum
Mount and torque wheels per specifications.
Torque Requirements
Item
U-bolt-10K
U-bolt-12K & 16K
Spring Eye Bolt
Equalizer Bolt-10K
Equalizer Bolt-12K & 16K
Plastic Cap
Torsion Mounting Bolts
Brake Nuts
Lug Nuts
Size
Torque (ft-lbs)
⅝”-11
90-110
¾”-10
130-170
¾”-16
0-1/16” End Play
1”-8
0-1/16” End Play
1⅛”- 7
0-1/16” End Play
3¾”-8
20-30
½”-13
90-110
½”-20
70-100
See Wheels & Tires
Oil & Grease Specifications
Grease
Specification
Characteristic
NLGI Grade Number
2
NLGI Certified, ASTM D 4950
GC-LB
Dropping Point (ASTM D 2265)
500 °F
Color
Blue/Red
Thickener
Lithium Complex
Viscosity Index
80
EP/Anti-wear, Rust and
Oxidation Inhibited
Additives
Common Sources
CITGO
Mystik Oil Company,
Inc.
Lithium Complex Grease, EP No. 2
JT-6 HI-TEMP Grease No. 2
23
Exxon Mobil
Mobil 1 Synthetic Grease
Conoco Phillips
Multiplex Red No. 2
Premium Wheel Bearing Grease 707L
Red
Multi-Purpose Grease GM (General
Motors)
Pennzoil
Valvoline (Ashland,
inc.)
Note: DO NOT mix anhydrous calcium based grease with lithium based grease.
Oil
Specification
Characteristic
SAE Grade Number
90
Flash Point, ASTM D 92
400 °F
Color
Red/Amber
Viscosity Index, ASTM D 2270
115
API Service Classification
GL-4
Common Sources
CITGO
CITGEAR Standard XD
H&B Industries
HB-1160 Starfilm EP Gear lube
Mystik Oil Company, Inc.
Mystik Power Lubricants
Mystik Oil Company, Inc.
JT-7 Multi Purpose
Pennzoil
GEARPLUS SAE 80w-90 GL-4
Shell
Spirax GX
Note: DO NOT mix synthetic and non-synthetic oils.
Parts Lists
10K
B
A
B
C
D
E
U-BOLT
SPRING
LOCK WASHER
U-BOLT PLATE
HEX NUT
C
UB95BZPS
8131
58LW
10625BZPN
58HN
A
D
E
24
10K Continued
I
L
K
J
V
X
N
O
T U
W
F
G
H
L
M
O
P
Q
R
S
F
G
OIL CAP PLUG
CAP
H
I
J
K
L
M
N
O-RING
OIL CAP ASSEMBLY
COTTER PIN
SPINDLE NUT
SPINDLE WASHER
OUTER BEARING
DRUM
O
P
Q
R
S
WHEEL STUD
LOCK NUT
ARMATURE BOLT
ARMATURE PLATE
DRUM ASSEMBLY
T
U
INNER BEARING
OIL SEAL
V
W
X
BRAKE ASSEMBLY
BRAKE NUT
LUG NUT
RP-200
12011 (OIL)
1201G (GREASE)
V75340
12011-1
CP-3
4797
4798
25580
9986B-1P (4.88)
99865-1P475 (4.75)
4738-28
14LN
FL14201
10KARM
99865-1PA (4.88)
99865-1P475A (4.75)
28580
CR27438 (OIL)
OB27377 (GREASE)
4738-L/R
12LN
568216
12K
A
B
C
E
D
A
U-BOLT
UB121625BZPL
25
B
C
D
E
SPRING
LOCK WASHER
U-BOLT PLATE
HEX NUT
8132
34LW
121625BZPN
34HN
26
12K Continued
R
J K
I
N O P Q
T
U
W
F
G
L M
H
S
V
F
G
OIL CAP PLUG
CAP
H
I
J
K
L
M
N
O
P
Q
R
S
O-RING
OIL CAP ASSEMBLY
COTTER PIN
SPINDLE NUT
SPINDLE WASHER
OUTER BEARING
LUG NUT
HUB
WHEEL STUD
ATTACHING BOLT
DRUM
DRUM ASSEMBLY
T
U
INNER BEARING
OIL SEAL
V
W
BRAKE ASSEMBLY
BRAKE NUT
RP-200
12011 (OIL)
1201G (GREASE)
V75340
12011-1
CP-3
47127
47128
JM205149
568216
812865-1
4738-28
1215BOLT
912865-1-DRUM
912865-1(4.88)
912865-1475 (4.75)
39590
CR31281 (OIL/GREASE)
OB3145059 (OIL/GREASE)
4741-L/R
12LN
16k
A
B
C
D
E
A
U-BOLT
UB121625BZPL
B
C
D
E
SPRING
LOCK WASHER
U-BOLT PLATE
HEX NUT
093182-14
34LW
121625BZPN
34HN
27
16K Continued
N O P Q
I
R
J
U
V
X
F
G
K LM
H
S
W
T
Ra
Qa
Pa
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
X
OIL CAP PLUG
CAP
O-RING
OIL CAP ASSEMBLY
COTTER PIN
SPINDLE NUT
SPINDLE WASHER
OUTER BEARING
LUG NUT
STUD RING
WHEEL STUD
HUB
DRUM
ATTACHING BOLT
DRUM ASSEMBLY
INNER BEARING
SEAL
BRAKE
BRAKE NUT
8 Bolt Hub
Na
Pa
Qa
Ra
Ta
RP-200
12011 (OIL)
V75340
12011-1
CP-3
47127
47128
JM205149
09065114
4741-10
4741-34
816108-1
916108-1-DRUM
1215BOLT
916108-1
39590
CR31281 (OIL/GREASE)
4741-L/R
12LN
LUG NUT
WHEEL STUD
HUB
DRUM
DRUM ASSELMBLY
WN333
4741-30
816810-1
912865-1-DRUM
916810-1
Na
S
Ta
TROUBLESHOOTING
New trailers are those with less than 250 miles on them or less than 2 week old
BRAKING
Brakes on new trailer seem to be inoperative or weak.
•
Brakes may still be in the burnish phase if the trailer has less than 250 miles on it. Monitor
braking to see if it improves with use.
•
Check brake controller and trailer electrical connections for proper setup as well as for open and
short circuits.
•
Trailer may be overloaded. Check weight or loaded trailer. See page 7.
•
Insufficient current draw by the magnet. Check electrical connections.
•
Brake may need to be re-adjusted. See page 14.
•
Possible lining contamination. Check brake shoes for contamination.
28
•
•
Check magnet for grease or oil. Clean as needed.
NOTE: SOME INTEGRATED BRAKE CONTROLLERS DO NOT WORK ON ALL BRAKING SYSTEMS.
PLEASE SEE VEHICLE OWNER’S MANUAL FOR GUIDANCE.
Brakes on used trailer seem to be inoperative or weak.
• Insufficient current draw by the magnet. Check electrical connections for open and short circuits.
• Brake may need to be re-adjusted. See page 14.
• Possible lining contamination. Check brake shoes for contamination.
• If trailer has been stored for longer than 3 months please see section on storage, see page 21.
• Brake linings may be glazed.
• Magnets may be worn.
• Check magnet for grease or oil. Clean as needed.
• Trailer may be overloaded. Check weight or loaded trailer. See page 7.
• Tires may have a large static load radius (SLR).
• Brake drums may be worn or severely scored. See page 15
Brakes on new trailer seem to drag.
• Check brake controller, breakaway switch, and trailer electrical connections for proper setup.
• Brake may need to be re-adjusted. See page 14.
• Brake assembly may be mounted improperly. See page 11.
• Bearings may be too loose. Check bearing adjustment. See page 17.
• Drums may be out of round. Check drum run-out see page 15.
• Brake lining may have become detached.
• Brake components or other debris may be loose and lodged in drum.
• NOTE: SOME INTEGRATED BRAKE CONTROLLERS DO NOT WORK ON ALL BRAKING SYSTEMS.
PLEASE SEE VEHICLE OWNER’S MANUAL FOR GUIDANCE.
Brakes on used trailer seem to drag.
• Check brake controller, breakaway switch, and trailer electrical connections for proper setup.
• Brake may need to be re-adjusted. See page 14.
• Possible lining contamination. Check brake shoes for contamination.
•
Brake assembly may be mounted improperly. See page 11.
• Brake components or other debris may be loose and lodged in drum.
• Brake lining may have become detached.
• Spindle may be bent.
• Check for excessive brake dust in drum. Brake may need to be re-adjusted. See page 31.
• Check for excessive brake dust in drum. Brake may be seized. If trailer has been not been used
recently. Please see section on storage, page 21.
• Check brake linings for wear pattern. See page 11.
• Check that brake components move freely. Lubricate as needed.
• Drums may be out of round. Check drum run-out. See page 15.
Brakes on new trailer squeal.
• If in a humid environment some squeal may be normal.
• Check for excessive brake dust in drum. Brake may need to be re-adjusted. See page 14.
29
•
•
•
Check for excessive brake dust in drum. Brake may be seized; this most often occurs if trailer is
several months post manufacture when purchased. Please see section on storage, page 21.
Check brake linings for wear pattern. See page 11.
If accompanied by dragging see Troubleshooting, Brakes on new trailer seem to drag.
Brakes on used trailer squeal.
• If in a humid environment some squeal may be normal.
• Check for excessive brake dust in drum. Brake may need to be re-adjusted. See page 14.
• If trailer has been stored for longer than 3 months please see section on storage, page 21.
• If accompanied by dragging see Troubleshooting, Brakes on used trailer seem to drag.
• Brake shoe may be bent.
• Spindle may be bent.
• Check that brake components move freely. Lubricate as needed.
Brakes on trailer seem to be warm/hot.
Brakes operate in temperature ranges in excess of 400°F. 130°F may cause burns. It is common for
new trailer brakes to have 90°F temperature difference between them. Monitor this to see if it goes
away.
•
•
•
Verify that the source of the heat is the drum and not the hub portion of the hub/drum
assembly. The drum should be hotter than the hub near the grease/oil cap.
If this is accompanied by dragging/squealing see sections above.
Check brake controller, breakaway switch, and trailer electrical connections for proper setup.
Brakes on new trailer lock up
• Check brake controller, breakaway switch, and trailer electrical connections for proper setup.
• Does the trailer have to roll back to release? Brake may be under-adjusted and will need to be
re-adjusted. See page 14.
• Brake components or other debris may be loose and lodged in drum.
• Axle and/or brake assembly may be installed incorrectly.
• Possible lining contamination. Check brake shoes for contamination.
• Brake lining may have become detached.
• Bearings may be too loose. Check bearing adjustment. See page 17.
• Drums may be out of round. Check drum run-out. See page 15.
Brakes on used trailer lock up
• Check brake controller, breakaway switch, and trailer electrical connections for proper setup.
• Brake components or other debris may be loose and lodged in drum.
• Axle and/or brake assembly may be installed incorrectly see page 14.
• Possible lining contamination. Check brake shoes for contamination.
• Brake lining may have become detached.
• Does the trailer have to roll back to release? Brake May be under-adjusted and will need to be
re-adjusted. See page 14.
• Spindle may be bent.
30
•
•
Brake shoe may be bent, Check shoe lining for wear pattern. See page 11
Drums may be out of round. Check drum run-out. See page 15.
Brakes on trailer are intermittent
• Check brake controller and trailer electrical connections for proper setup as well as for open and
short circuits
• Check for broken wires near pinch points and replace.
Brakes on trailer are harsh
• Check brake controller and trailer electrical connections for proper setup.
• Brake may need to be adjusted. See page 14.
Brakes on trailer surge
• Possible lining contamination. Check brake shoes for contamination. Check magnet for grease or
oil. Clean as needed.
• Drum may be out of round. See page 15.
• Check brake controller and trailer electrical connections for proper setup.
HUBS & BEARINGS
Excessive vibration when towing
• Check tires for bulges, flat, spots, etc to rule out faulty tire or out of balance wheel.
• Often vibrations from out of round hubs peak around 50 miles per hour. If this happens check
drum for visual distortions.
• Check bearing endplay. Tire tilt should be no more than .005” per inch of tire diameter. End play
should be no more than .010”.
• Often this is due to a broken suspension component, if none of the above applies. Check u-bolts,
bushings, springs, etc.
Excessive heat from Hub/drum
Often the source is from the brake assembly. See Brakes on trailer seem to be warm/hot in the
Braking section above
• Spindle nut may be too tight, adjust as needed. See page 17.
• Lack or wrong type of grease/oil.
• Check that lubricant is dark in color. Pale colored grease may be contaminated with water.
Dust caps fall off
• Improper installation. Replace
• If problem is persistent hub may be defect. Replace hub.
Persistent seal leaks
• Improper selection of or bad installation of seal. See page 16.
• Damaged hub housing.
• Damaged spindle. Spindle finish should be below 100 microns.
31
SUSPENSION
Rubber Bushings wear pre-maturely
• Overloaded trailer. See page 14
• Bolts holding bushings on are tightened improperly. Verify that bolts are torqued properly. See
page 22.
• Hangers are welded on crooked and/or other axle mounting defect. Verify that hangers are
welded onto trailer properly and springs are straight.
• Bushing housing is worn and causes bushings to be loose. Verify that holes for bushings meet
manufacturer’s requirements.
Cracked bushing housing
• Overloaded trailer. See page 7.
• Direct metal to metal contact with no lubricant. Replace components and follow maintenance
schedule.
Failed Leaf Spring
• Loose U-bolts. Spring will fail at the center pin near between the u-bolts. See torque
requirements page 22.
• Corrosion. Failure locations vary. This is most common in marine applications.
• Fatigue Failure. Shorter leaves will break first.
• Fatigue Failure. Leaf spring has started to flatten out. Replace springs.
• Material flaw. Only determinable by testing.
Failed Torsion Suspension
• Heat applied to axle tube or attaching brackets.
• Overloaded trailer. See page 7.
• Mixed start angles on tandem axle setup.
• Severe corrosion on axle beam caused by using non-galvanized axle in corrosion prone
environments.
• Material Flaw. Only determinable by testing.
32
Sales & Service
Replacement parts for Rockwell American axles can be ordered directly from Quality Trailer Products by
calling (877) 787-2453
or by visiting any of our 19 Direct Distribution Centers nationwide.
Alabama
Arizona
California
Birmingham
Phoenix
Fresno
960 Grants Mill Rd
2930 West Osborn Road
2888 S. Orange Ave.
Irondale, Alabama 35210
Phoenix, Arizona 85017
Fresno, California 93725
Phone: (800)874-4292
Phone: (888)999-8233
Phone: (800)742-6203
Fax: (800)655-2944
Fax: (602)271-0148
Fax: (559)237-1913
Birmingham@qtrailer.com
Phoenix@qtrailer.com
Fresno@qtrailer.com
California
California
California
Hayward
Montebello
2035 American Ave.
1550 Gage Road
National City
1616 Precision Park Lane, Suite
D
Hayward, California 94545
Montebello, California 90640
San Diego, California 92173
Phone: (800)200-8703
Phone: (800)624-1715
Phone: (800)472-2202
Fax: (510)887--895
Fax: (323)722-4177
Fax: (619)662-1696
Hayward@qtrailer.com
Montebello@qtrailer.com
Nationalcity@qtrailer.com
California
Colorado
Florida
Sacramento
Aurora
Plant City-Mfg
3701 Parkway Place
W. Sacramento, California
95691
14600 E. 35th Place-Unit B
3804 Sydney Road
Aurora, Colorado 80011
Plant City, FL 33567
Phone: (800)3216362
Phone: (800)307-5944
Phone: (813)659-2948
Fax: (916)371-0228
Fax: (303)307-4774
Fax: (813)659-9847
Sacramento@qtrailer.com
Aurora@qtrailer.com
Plantcity@qtrailer.com
Indiana
Missouri
Minnesota
Angola
Kansas City
Freeport
1304 Wohlert St.
519 Duck Road
208 7th St. SW
Angola, IN. 46703
Grandview, Missouri 64030
Freeport, Minnesota 56331
Phone: (877) 730-3748
Phone: (888)913-8500
Phone: (888)325-1485
Fax: (877) 730-6130
Fax: (800)445-6058
Fax: (320)836-9550
Angola@qtrailer.com
Kansascity@qtrailer.com
Freeport@qtrailer.com
33
Oklahoma
Oregon
Pennsylvania
Seminole
New Holland
1801 Ray Davis Blvd.
Wilsonville
27180 S.W. 95th Ave. Suite
3320
Seminole, Oklahoma 74868
Wilsonville, Oregon 97070
New Holland, PA 17557
170 Commerce Dr.
Phone: (800)221-7185
Phone: (800)914-9116
Phone: (800)497-0986
Fax: (800)443-2795
Fax: (503)682-0520
Fax: (717)354-7076
Seminole@qtrailer.com
Wilsonville@qtrailer.com
Newholland@qtrailer.com
South Carolina
Texas
Florence
Azle
Texas
Mt. Pleasant
Hwy 76 Palmetto Ind. Park
Timmonsville, South Carolina
29161
501 Redbud Ln
Hwy. 67 East
Azle, Texas 76020
Mt. Pleasant, Texas 75455
Phone: (800)238-3903
Phone: (800)242-4882
Phone: (800)635-1354
Fax: (800)207-4770
Fax: (800)889-1435
Fax: (800)301-7943
Florence@qtrailer.com
Azle@qtrailer.com
Mtpleasant@qtrailer.com
Texas
Texas
Royse City-Mfg.
San Antonio
1012 Industrial Drive
1334 S. General Mcmullen Dr.
Royse City, Texas 75189
San Antonio, Texas 78237
Phone: (800)334-6355
Phone: (800)854-8058
Fax: (972)635-2049
Fax: (800)343-1895
Roysecity@qtrailer.com
Sanantonio@qtrailer.com
Technical Support
Technical support can be obtained by contacting (877) 787-2453, AxleSupport@rockwell.com
or (800) 334-6355 for advanced troubleshooting.
Warranty
Rockwell American
Limited Warranty
Quality Trailer Products- extends to the original purchaser only, a limited warranty on each Rockwell American axle assembly against
defects in material or workmanship for a period of two (2) years from the date of purchase.
A warranty period of five (5) years is extended to Equalizer Torsion Axle Suspensions exclusive of wear items (hubs, brakes,
bearings, and seals).
To obtain warranty service, please call (800) 334-6355 and provide the following information:
a.
b.
c.
d.
e.
Name and mailing address of purchaser.
Proof of date of purchase.
Name of manufacturer of unit under which the axle was mounted.
Year and serial number of the trailer and axle.
Name and address of dealer whom from the unit was purchased.
34
1
This warranty does not extend to:
a.
The connection of brake wiring to the trailer wiring or trailer wiring to the towing vehicle wiring.
b.
The attachment of the axles to the frame.
c.
Hub imbalance or any damage caused thereby.
Parts not supplied by Quality Trailer Products.
d.
e.
Any damage whatsoever if caused by or related to any alteration to the axle.
f.
Use of axle assembly on unit other than that to which it was originally mounted.
g.
Normal wear including hubs, brakes, bearings, or seals.
2
This warranty does not cover defects caused by:
Improper installation.
a.
b.
Damage (not resulting from defect or malfunction) while in the possession of the customer.
c.
Unreasonable use (including failure to provide reasonable and necessary maintenance)
3
Repair or replacement under this warranty is the exclusive remedy of the customer. Quality Trailer Products shall not be liable
for any incidental or consequential damages, including towing fees, hotel bills, telephone calls and meals for breach of any
express or implied warranty on the axle
Some states do not allow the exclusion or limitations of incidental or consequential damages, so the above limitation or
exclusion may not apply to you. This warranty gives you specific legal rights and you may have other rights which vary from
state to state.
4
NOTES:
PUB-HDOP
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