Tire Changer
For servicing single piece automotive and
most light truck tire/wheel assemblies
Safety Instructions
Operating Instructions
Installation Instructions
Maintenance Instructions
READ these instructions before placing unit in
service KEEP these and other materials delivered
with the unit in a binder near the machine for
ease of reference by supervisors and operators.
1601 J. P. Hennessy Drive, LaVergne, TN USA 37086-3565 615/641-7533 800/688-6359
HENNESSY INDUSTRIES INC. Manufacturer of AMMCO®, COATS®and BADA®Automotive Service Equipment and Tools.
Manual Part No.:85608978 00
Table of Contents
Operator Protective Equipment
Definitions of Hazard Levels ................................1
Owner's Responsibility ........................................1
Principal Operating Parts .....................................2
Operating Instructions .........................................3
Bead Loosening and Demounting ................3
Mounting .........................................................5
Inflation ..................................................................6
Bead Sealing ...................................................6
Bead Seating ...................................................6
Inflation ...........................................................7
Performance Tires/Custom Wheels ....................8
Custom and Special Wheels ................................9
Tube Type Tires ...................................................12
Personal protective equipment helps make tire
changing safer. However, equipment does not
take the place of safe operating practices.
Always wear durable work clothing during tire
service activity. Shop aprons or shop coats may
also be worn, however loose fitting clothing
should be avoided. Tight fitting leather gloves
are recommended to protect operator’ s hands
when handling worn tires and wheels. Sturdy
leather work shoes with steel toes and oil
resistant soles should be used by tire service
personnel to help prevent injury in typical shop
activities. Eye protection is essential during tire
service activity. Safety glasses with side shields,
goggles, or face shields are acceptable. Back
belts provide support during lifting activities
and are also helpful in providing operator
protection. Consideration should also be given
to the use of hearing protection if tire service
activity is performed in an enclosed area, or if
noise levels are high.
Stages of Inflation ...............................................10
Bead Seal ......................................................10
Bead Seat ......................................................10
Inflation .........................................................10
Mis-Matched Tires and Wheels .........................10
Maintenance Instructions ..................................11
Installation Instructions .....................................13
Failure to follow
danger, warning, and
caution instructions
may lead to serious
personal injury or death to operator or bystander
or damage to property. Do not operate this
machine until you read and understand all the
dangers, warnings and cautions in this manual.
Download a copy of the manual from our
website at www.ammcoats.com, or for further
information, contact:
Critical Safety Instructions .................Back Cover
Hennessy Industries, Inc.
1601 J.P. Hennessy Drive
LaVergne, TN 37086-3565
(615) 641-7533 or (800) 688-6359
For additonal tire, wheel, and/or inflation
information contact the following:
1400 K Street N.W.
Washington, DC 20005
(202) 682-4800
The Tire Information Center
1101-6 South Rogers Circle
Boca Raton, FL 33487-2795
(561) 997-9229
Definitions of Hazard Levels
Identify the hazard levels used in this manual
with the following definitions and signal words:
Watch for this symbol:
It Means: Immediate hazards which will result
in severe personal injury or death.
Watch for this symbol:
It Means: Hazards or unsafe practices which
could result in severe personal injury or death.
Watch for this symbol:
It Means: Hazards or unsafe practices which
could result in minor personal injury or product
or property damage.
Watch for this symbol! It means BE ALERT!
Your safety, or the safety of others, is
Owner's Responsibility
To maintain machine and user
safety, the responsibility of the owner is to
read and follow these instructions:
• Follow all installation instructions.
• Make sure installation conforms to all
applicable Local, State, and Federal
Codes, Rules, and Regulations; such as
State and Federal OSHA Regulations
and Electrical Codes.
• Carefully check the unit for correct
initial function.
• Read and follow the safety instructions.
Keep them readily available for
machine operators.
• Make certain all operators are properly
trained, know how to safely and
correctly operate the unit, and are
properly supervised.
• Allow unit operation only with all parts
in place and operating safely.
• Carefully inspect the unit on a regular
basis and perform all maintenance as
• Service and maintain the unit only with
authorized or approved replacement
• Keep all instructions permanently with
the unit and all decals on the unit clean
and visible.
Explosion Hazard
Never exceed 40
PSI while seating
Explosion Hazard
Never inflate
tire above
pressure after bead
is seated.
COATS 4070 Tire Changer • 1
Principal Operating Parts
Know Your Unit
Compare this illustration with the unit before
placing it into service. Maximum performance
and safety will be obtained only when all
persons using the unit are fully trained in its
parts and operation. Each user should learn the
function and location of all controls. Prevent
accidents and injuries by ensuring the unit is
properly installed, operated, and maintained.
1 Center Post
Post Key — Rotates combination tool for
2 Center
mounting and demounting operations.
Do It Now
Now is a good time to fill out the warranty
registration card. This card must be mailed
within 30 days of purchase or the warranty
may be voided.
Air-Flate Pedal — 3 position pedal for tire inflation
13 via air hose/chuck. Do not press without tire/wheel
assembly on unit.
Air-Flate Jets — Expands tire sidewalls to bead seat
Centering Cone — Centers the wheel to the contoured
table top.
14 portion of rim for the bead sealing process.
Positioning Pin — Engages lug hole in wheel to prevent
during mounting and demounting.
15 Air Chuck — Clip-on style.
Table Top
Manual Release Valve — Allows for manual release
16 of air pressure from the tire.
Air Gauge — Registers tire pressure when air chuck
6 Upper Bead Loosener Shoe
17 is attached to the valve stem and inflation pedal is
7 Adjustable Upper Bead Loosener — Adjusts to
accomodate wide wheels.
Control Knob — Controls the amount of travel
8 Detent
of the lower bead loosener to prevent damage to
large diameter narrow wheels and reverse mount wheels.
9 Rubber Lubricant Dispenser
Serial Number Plate — Record the serial number on
10 the Owner’s Registry Card and on your copy of the
warranty card. Provide this number with any warranty or
service claim, and with all parts orders.
Combination Tool — Used in mounting and
demounting operations.
Pedal — Operates the air valve for power bead
12 Foot
loosening, mounting, and demounting.
2 • COATS 4070 Tire Changer
Bead Loosener — 2 shoes for lower bead
18 Lower
Center Post Extension (Optional, Part
19 Short
#8108313) — Lengtens center post for wheels
between 10 an 14 inches wide.
Center Post Extension (Optional, Part
20 Long
#8108313) — Lengtens center post for wheels over
14 inches wide.
1/4” Shim — Installs on lower bead loosener to
21 prevent damaging aluminum and magnesium wheels
with wide flanges.
Hold Down Tube — Used with styled steel wheels to
22 prevent the centering cone from touching the wheel.
Operating Instructions
The unit must be properly operated and properly
maintained to help avoid accidents that could
damage the unit and injure the operator or
bystanders. This section of the Operating
Instructions manual review basic operations and
use of controls. These instructions should be
reviewed with all employees before they are
allowed to work with the machine. Keep these
instructions near the machine for easy reference.
4. Thread centering cone clockwise onto the
center post. As the tapered end enters the
center hole of the wheel, the tire/wheel
assembly will adjust itself on the table top. Be
sure the cone is hand tight and is centered in
the wheel’ s center hole (Fig. 2).
Bead Loosening and Demounting
This machine may
operate differently from
machines you have
previously operated.
Practice with a regular steel wheel and tire
combination to familiarize yourself with the
machine's operation and function.
NOTE: Always review nicks and scratches with
owners of expensive wheel and tire combinations
prior to servicing.
IMPORTANT: Refer to the Performance Wheels
and Tires section of this manual before servicing
custom and performance wheel and tire
Figure 2 - Thread the Centering Cone onto the Center Post
5. Check the detent control knob for proper
setting. Forward is used for all tire and wheel
combinations except 15” x4” , 16” x5” to 7” ,
and 17.5” x5.5” to 7.5” . To move the detent
lever, push the knob down, move it to the
proper setting, and release the knob (fig.3).
IMPORTANT: Refer to the Tube Type Tires section
of this manual before servicing tires with tubes.
1. Determine the correct side of the wheel for tire
removal. Remove the tire from the narrow side
(tire mounting side). Tire will not mount or
demount from the long side.
NOTE: On some wheels, the sides may be nearly
equal. Measure carefully. Only the narrow side is
used for mounting and demounting.
Narrow Side
Drop Center
Long Side
Figure 3 - Positioning the Detent Control Knob
6. Place the upper bead loosener shoe on the tire
next to, but not on, the rim (fig.4). Press down
on the foot pedal until both bead looseners
complete their full stroke. If the top bead is not
completely loosened, release the foot pedal
until the unit has completed the full return
stroke and press the foot pedal again. The
ratchet effect on the loosener will deliver a
deeper stroke. The repeat cycle is used only if
the upper bead is not loosened.
Figure 1 - Determining Tire Mounting Side
2. Remove the valve core and allow all of the air
to escape from the tire. Remove all weights
from rim.
3. Place the tire/wheel assembly over the center
post and down onto the contoured table top,
with the narrow side of bead seatup (figure 1).
The positioning pin must engage a lug hole in
the wheel. Position the tire/wheel assembly so
that the valve stem is on the operator’ s side of
the machine.
NOTE: Make fine adjustments to the lower
bead loosener shoe with the shim kit before
placing mag or alloy wheel assemblies on the
table top. Refer to the instructions on bead
loosener shoe and pages 8 and 12.
Figure 4 - Positioning the Upper Bead Loosener Shoe
Note: If may be necessary to loosen the bead at
different points around the wheel circumference to
entirely free the bead.
COATS 4070 Tire Changer • 3
7. Once the tire beads have been loosened from
the bead seat of the wheel, lubricate the beads
liberally with rubber lubricant (fig.5).
Note: Rubber lubricant makes demounting
easier, helps eliminate damage to the tire
beads, and assists the movement of the
combination tool.
10. Press down on the foot pedal. The
counterclockwise rotation of the center post
key and combination tool will remove the
upper tire bead from the rim. Lifting up on the
tire with the left hand as shown by the arrow in
figure 8 helps in demounting tougher tires.
Figure 8 - Removing Upper Bead
Figure 5 - Lubricate Tire Beads
8. Position the combination tool so that it aligns
with the center post key. Insert the demount
end of the tool between the tire and rim. Push
the tool down towards the center post as
shown in figure 6 to lift the tire bead over the
IMPORTANT: Make sure the tool is oriented as
shown in figure 6.
Figure 6 - Align, Insert, and Push Down on the Tool
9. Continue to push down on the tool until the
center post key protrudes through the slot in
the tool and the tool stops against the shoulder
of the key. The tool is now positioned properly
for operation of the center post key (figure 7).
Keep a firm hold on the tool at all times to
prevent accidental disconnet.
Figure 7 - Tool Properly Positioned
4 • COATS 4070 Tire Changer
10. To remove the lower bead from the wheel,
repeat steps 8, 9, and 10.
REMEMBER: Refer to the Tube Type Tire
section of this manual before servicing tires
with tubes.
movement of the bead
loosener shoes or the
combination tool indicates low cylinder oil level,
and may result in throwing or disengaging of the
tool, possibly causing serious injury or death to
operator or bystander. Do not operate until it has
been returned to proper operating condition. See
the Maintenance section of this manual for further
instructions on maintenance and adjustment.
When the demount operation is
complete, proceed with Mounting,
page 5.
Operator Protective Equipment
Always wear durable work clothing during tire
service activity. Shop aprons or shop coats may
also be worn, however, loose fitting clothing
should be avoided. Tight fitting leather gloves
are recommended to protect the operator's
hands when handling worn tires and wheels.
Sturdy leather work shoes with steel toes and
oil resistant soles should be used by tire service
personnel to help prevent injury in typical shop
activities. Eye protection is essential during tire
service activity. Safety glasses with side shields,
goggles, or face shields are acceptable. Back
belts provide support during lifting activities
and are also helpful in providing operator
This information must be read and followed
carefully to prevent accidents and injuries during
Ensure the tire bead
diameter stamped on
the tire to be mounted
exactly matches the rim
diameter stamped on the wheel. Consult the
Rubber Manufacturer’ s Association charts for
approved rim widths and recommended tire sizes.
Mis-matched tires and wheels explode.
Figure 10 - Lubricate Beads
Never Mount a tire and
wheel handed to you by
checking both tire and
wheel for damage and compatibility. Be extra
cautious of persons without knowledge of tire
service. Keep by-standers out of service area.
damaged tire. Never
mount a tire on a rusty
or damaged wheel.
Tires and/or wheel may explode.
If you damage the tire
bead during mounting
process, STOP! Remove
the tire and mark it as
damaged. Do not mount a damaged tire.
1. Inspect the wheel closely for damage. Remove
any rubber or light corrosion from rim (figure
9). Inspect both the inside and outside of the
tire, and pay special attention to the bead area.
Do not attempt to service heavily corroded
wheels. Apply rubber lubricant to the outside
of both beads and to the inside of the top bead
(figure 10).
Figure 11 - Positioning Tire and Combination Tool
4. Push down on the tire with your left hand to
hold the lower bead in the drop center of the
wheel. Use your right hand to hold the
combination tool down over the center post
key. Refer to figure 11.
5. Press the foot pedal. Continue to push the tire
down into the drop center and maintain
pressure against the combination tool while it
rotates. Allow the combination tool to make a
full cycle.
6. Mount the upper bead in the same manner
(figure 12). Repeat steps 2, 3, 4, and 5.
2. Place the tire over the wheel as shown in figure
11. Hook the mounting end of the combination
tool over the rim flange and place the slot in
the tool over the center post key.
3. Grasp the tire and rotate it clockwise until the
lower bead contacts the mounting end of the
tool. Continue to rotate the tire until the bead
slides into the groove on the tool (figure 11).
Figure 12 - Mounting Upper Bead
Do not force the tire
onto the rim. Bead
damage could result
making the tire unsafe
and/or creating the risk of injury in mounting
Figure 9 - Inspect Wheel Before Beginning
When you have completed the mounting
process, proceed to Inflation, page 6.
COATS 4070 Tire Changer • 5
Tire inflation is performed in three steps: Bead
Seal, Bead Seat and Inflation. These steps are
explained in detail on page 10. Read the
explanation of each step and understand them
thoroughly before proceeding.
Bead Sealing
1. Connect the inflation hose to the tire valve stem.
2. Lift tire so that the upper bead is against the
edge of the rim to create a seal. Be sure the
upper bead is over the bottom of the valve
stem (figure 14).
operation. Accurate
pressure readings are important to safe tire
inflation. Refer to the Operating Maintenance
section of this manual for instructions.
Tire failure under
pressure is hazardous.
This tire changer is not
intended to be a safety
device to contain exploding tires, tubes, wheels,
or bead sealing equipment. Inspect tire and wheel
carefully for match, wear, or defects before
mounting. Always use approved tire bead
lubricant during mounting and inflation.
Figure 14 - Bead Sealing
3. Depress the Air-Flate pedal to position 2 and
hold for 1 second to begin air flow through the
inflation hose, then depress the Air-Flate pedal
fully to position 3, hold very briefly (less than 1
full second), and remove foot from the pedal.
The blast of air through the inflation hose and
the top cover jets will expand the tire and seal
the beads (figure 14).
4. Check to make sure that the beads are sealed
to the wheel. Repeat step 3 if they are not fully
Figure 13 - Air-Flate Pedal Positions
The COATS Air-Flate system is operated with a
three position foot pedal (referred to as the AirFlate pedal). Each position of the Air-Flate pedal
performs a specific function (figure 13):
Position 1 - Tire Pressure – When foot is removed
from the pedal, it will return to this position. When
the inflation hose is attached to the tire valve, the
pressure gauge will register the pressure in the
NOTE: The clip-on chuck on the end of the hose is
an important safety aid and should always be an
open style with all parts in proper working order.
Position 2 - Tire Inflation – By pressing the AirFlate pedal down to this first activated position, full
air line air pressure is applied to the inflation hose
for tire inflation. Remove your foot from the pedal
(position 1) to read tire pressure on the pressure
gauge. See page 7 for pressure limiter information.
Position 3 - Bead Sealing – Press the pedal down
fully and full air line air pressure is applied to the
inflation hose and to the bead seal jets mounted in
the top cover.
Use Position 3 for bead
sealing only. Do not use
this position without a
tire and wheel positioned on the tabletop. Dirt and
debris could be blown into the air with enough
force to injure the operator or bystanders. Do not
use the position to inflate a tire.
6 • COATS 4070 Tire Changer
NOTE: Allow time for the surge tank pressure
to recover before depressing the pedal to
position 3 again.
TIP: If the tire and wheel are properly lubricated and
the operator cannot achieve bead seal after 3
attempts, it may help to remove the valve core.
Remove the air chuck from the valve stem and
unscrew the valve core from the stem. Reattach the
air chuck and perform the bead seal operation again.
5. Check tire pressure (Air-Flate pedal must be in
position 1). If pressure is indicated in tire, bead
seal has been obtained. Proceed to Bead
Bead Seating
Operator should keep
hands, arms, and entire
body away from the tire
and wheel during the
remaining Bead Seat and Inflation procedures. Do
not stand over tire, as personal injury could result.
NEVER increase air
pressure to exceed 40
PSI when attempting
Bead Seat. If unable to
obtain Bead Seat, something is wrong. Deflate tire
completely, inspect both the tire and wheel, and
correct any problems found. Relubricate both tire
beads, and reattempt Bead Seal and Bead Seat
procedures. Follow all safety instructions in this
manual and on machine.
Check tire pressure
frequently. Never exceed
40 PSI while seating
beads. Once seated,
never exceed tire manufacturer's recommended air
pressure. Tires can explode, especially if they are
inflated beyond their limits. At all pressure levels
when inflating through the valve stem, keep
hands, arms, and entire body away from inflating
tire. An exploding tire, wheel, or bead sealing
equipment may propel upward and outward with
sufficient force to cause serious injury or death to
operator or bystander.
1. Verfy that beads are sealed by checking the
gauge for air pressure in the tire. Do not
proceed if beads are not sealed.
2. If beads are sealed, loosen the centering cone
one full turn. DO NOT REMOVE IT!
3. Inject frequent, short bursts of air into the tire
by pressing the Air-Flate pedal to position 2 and
releasing. Continue the bursts until the beads
move outward into their bead seat position.
Check the pressure frequently. If beads do not
seat, a problem exists. Investigate carefully and
correct the problem.
Figure 15 - Stand Back During Beat Seat and Inflation
4. Proceed to the inflation step only when both
beads are completely and properly seated.
NEVER exceed tire
pressure. Tires can explode, especially if inflated
beyond these limits. Keep hands, arms, and entire
body back from inflating tire. Avoid distraction
during inflation and observe tire pressure
frequently to avoid over inflation. Excessive
pressure can cause tires to explode, causing
serious injury or death to operator or bystander.
REMEMBER: If you removed the valve core for
bead sealing, it must be reinstalled before the tire is
1. Depress the Air-Flate pedal to position 2 and
inflate the tire. Release the pedal to position 1
and check the increasing pressure frequently to
avoid over inflation.
IMPORTANT: The 4070 is equipped with a pressure
limiter to assist the operator with proper tire
inflation. The 4070 limiter will keep most car and
light truck tires from inflating beyond 60 PSI
(smaller tires may reach higher pressures). Tires
that require inflation above 60 PSI should be
removed from the 4070 and inflated using a safey
chamber or safety cage. Tires can be over inflated
and explode even with the use of this pressure
limiter if other instructions in this manaul and on
the unit are not followed. Check the function of the
pressure limiter regularly and maintain as required
for safe and proper operation.
pedal is held steady at position 2, the Air-Flate
system’ s pressure limiter will automatically cycle
between inflation and off. This cycle will continue
until the pedal is released. The operator should
check the increasing pressure frequently to avoid
over inflation.
Figure 16 - Release Pressure with the Manual Release Valve
Explosion Hazard
Explosion Hazard
Never exceed 40 PSI
while seating beads.
Never inflate
tire above
pressure after bead is
COATS 4070 Tire Changer • 7
Performance Tires/Custom Wheels
Before You Begin - Pre-Operation Notes
Only tire technicians with training on custom
wheels should attempt to service expensive
custom alloy or aluminum wheels and high
performance low-profile tires.
Ensure all weights have been removed from
the wheel before servicing.
Assistance will be required on wide wheels.
Use ample lubricant during mounting and
demounting operations.
Always review wheel nicks and/or scratches
with the owner before servicing.
1. Check the clearance on the lower bead
loosener shoe. If it does not clear the rim lip,
install the 1/4” shim (figure 17).
Figure 19- Optional Short Center Post Extension
4. For mounting and demounting tires on wheels
wider than 14” , use the optional center post
extension (part #8108313). Slip the extension
over the center post key (figure 20).
To Install the Shim: Remove the tire/wheel
assembly from the tabletop and depress the
foot pedal. The loosener shoe will extend to
the top of it’ s stroke. Do not release the pedal.
Tilt the bead loosener shoe away from the
center post and slip the red 1/4” thick shim
over the end of the bolt between the shoe
adjusting bar and the lower shoe.
Figure 20 - Optional Long Center Post Extension
5. On wheels with thin or delicate center holes
that may be damaged by the centering cone,
use the optional Speed Mag or Custom
Wheeler Adapter (figure 21).
Figure 17- Installing 1/4” Shim
2. To service wheels over 11” wide, extend the
upper bead loosener post. Remove the clevis
pin, raise the post to the appropriate height,
and reinsert the pin (figure 18).
Figure 21 - Optional Speed Mag Adapter
6. Use the platic combination tool boots supplied
with the optional Speed Mag adapter to
prevent scratching of custom wheels (figure
22). Boots may be ordered separately (part
#8106568, 10 pairs).
Figure 18- Extending Upper Bead Loosener Post
3. For mounting and demounting tires on wheels
from 10” to 14” wide, use the optional short
center post extension (part #8108311). Slip the
extension over the center post key (figure 19).
Figure 22 - Combination Tool Boots
8 • COATS 4070 Tire Changer
Custom and Special Wheels
Tube-Type Tires
Alloy Wheels
Some manufacturers offer wheels with little or no
drop center. These are not DOT approved. The tire
or wheel - or both - can be damaged and the tire
could explode under pressure, resulting in serious
in jury or death. If you attempt to mount/demount
this type of wheel, use extreme caution.
1. Avoid pinching or forcing the tube.
2. Apply rubber lubricant to the beads of the tire.
3. Mount the bottom bead.
4. Put a small amount of air into the tube to
round it out.
No Drop Center
5. Apply rubber lubricant to the tube and the
mounting end of the combination tool.
6. Insert the tube into the tire.
Figure 23 - No Drop Center
7. Mount the top bead.
European Performance Wheels
(Asymmetrical Hump)
Some European wheels have very large humps
except near the valve hole. On these wheel, the
beads should be loosened at the valve hole on
both the upper and lower sides first.
1. After tire beads are loosened, lubricate the
beads and rim liberally.
Valve Hole
Figure 24 - Asymmetrical Hump on European Wheels
Wheels with Low Pressure Warning System
Newer cars have the pressure sensors attached to
the valve stem. The stem should face the operator
when loosening the bead.
Performance wheels on some vehicles (including
Corvette, BMW, Lamborghini Diablo) may have a
pressure sensor strapped to the rim opposite the
valve hole. On these wheels, the beads should be
loosened at the valve hole on both upper and
lower sides first.
Valve Hole
2. Position the combination tool as described in
step 8 on page 4.
3. Rotate the center post key/combination tool in
short steps. Depress the foot pedal and release
if after a short amount of travel. This allows
you to stop the process should the tube get
4. During the demount operation, allow the
combination tool to rotate only from the
starting position at 5 o’ clock to the 11 o’ clock
position. This will keep the tool from
contacting the lower bead loosener as it moves
upward each time the machine is cycled.
5. After the upper bead is demounted, remove
the tube from the tire and demount the lower
Do it Now
Always check to be sure you 4070 has a clearly
visible operator instruction decal.
Figure 25 - Wheels with Low Pressure Sensor
COATS 4070 Tire Changer • 9
Stages of Inflation
Review these descriptions and diagrams
carefully. Refer to them as necessary during
bead sealing, bead seating, and inflation to verify
that you are proceeding properly and safely.
Bead Sealing (machines equipped with Air Blast)
A 140 PSI air blast from the table top jets creates
an air curtain to aid in bead sealing. Never
exceed 10 PSI in the tire during bead sealing.
The tire will contain about 1/2 to 2 PSI when
bead seal is obtained.
Air flow through valve requires
about 140 PSI air pressure drop
to insure sufficient flow on difficult tires.
Requires rubber lubricant on
both upper and lower beads
Lift tire up to
assist seal on
top side
Air-Flate Jets
Bead Seating
Bead seating usually occurs on the long tapered
side of the wheel first and the shorter side last.
Bead seating will usually require at least 7 PSI in
the tire. 40 PSI is the maximum safe pressure at
this stage regardless of operating pressure.
Most European import cars and many
aftermarket alloy wheels are very tight and can
be difficult to bead seat. Also note that
asymmetrical hump and run-flat tires are
extremely difficult to bead seat. Follow tire
manufacturer's recommended procedure for
bead seating.
Usually last to "pop" is top side
Do not stand over
tire during inflation.
40 PSI
Requires visual confirmation of bead seat
After the beads are seated, the tire is inflated. Do
not inflate the tire above the manufacturer's
recommended pressure as stamped on the tire
sidewall. The typical inflation pressure for
automobile tires is between 24 and 45 PSI. Light
truck inflation pressure typically covers a wider
Never attempt to mount and inflate mis-matched
tires and wheels.
Mis-matched tire and
wheel combinations
personal injury or
death to operator and bystanders.
Do not stand over
tire during inflation.
Half Size Tires
14.5, 15.5, 16.5,
17/5, etc.
For safety, do not attempt to mount and inflate
mis-matched tires and wheels.
Even SIze Wheels
14.0, 15.0, 16.0,
17.0, etc.
Even Size Tires
14.0, 15.0, 16.0, 17.0, etc.
Bead will not
seat properly
10 • COATS 4070 Tire Changer
Half Size Wheels
14.5, 15.5, 16.5,
17/5, etc.
Note the gap
in this area
Note 15°
Bead Seat
Maintenance Instructions
Read and follow all the maintenance instructions
provided in this manual to keep the machine in
good operating condition. Refer to the other
materials received with the unit and to the service
bulletins from the manufacturer for additional
instructions on proper maintenance and service.
Regular inspections and proper maintenance are
essential to preventing accidents and injuries.
Before making any
inspection, adjustment,
or repair, disconnect
the power source and
block out all moving parts to prevent injury.
Keep the machine and
the immediate work are
clean. Do not use
compressed air to
remove dirt and debris from the machine. Foreign
material may be propelled into the air and into
operator or bystander causing personal injury.
clothing and use eye
adjustments or repairs to the machine.
Pressure Gauge Maintenance and Calibration
Check the tire pressure gauge function on the unit
daily, and perform an accuracy check monthly. Use
a pressurized tire and a high quality stick pressure
gauge. If necessary, calibrate the dial of the
machine gauge.
1. Pressurize a large 15” tire to 30PSI and
measure the pressure exactly with a high
quality extension type tire gauge. Connect the
air chuck to the tire.
2. Remove the gauge lens and loosen the 2
screws at the top of the gauge and rotate the
gauge face until the indicator is pointed at the
correct pressure as read with the extension
type tire gauge (figure 28).
3. Tighten gauge face screws and replace lens.
If gauge is defective, replace it immediately (part
Check the function of the pressure limiter weekly
as part of your pressure gauge maintenance and
Cylinder Maintenance
The unique design of the hydraulically dampened
8” cylinder controls bead loosening, mounting,
and demounting. If the oil becomes low, the
machine will surge at the beginning of its stroke. A
special hydraulic oil must be used.
Figure 28 - Calibrating Pressure Gauge
Filling 8” Cylinders
Fill only with COATS Hydraulic Oil (part #8101411)
or an approved alternate choice (Empak 4061, or
Shell Tellus 21). Do not use motor oil or brake
1. Remove cylinder (part #85608715) and slave
cylinder (part# 85608739).
2. Remove plug from slave cylinder and fill with
oil until there is no air in either cylinder or
connecting hose.
COATS 4070 Tire Changer • 11
Lower Shoe Setting
Check the lower shoe setting periodically to make
sure that it operates properly and does not contact
the wheels.
1. Place a 15” or 16” steel wheel on the machine
and secure with the centering cone.
NOTE: Make sure the wheel is centered.
2. Depress the foot pedal and run the lower shoe
up to 45 degrees above the radius of the lower
rim flange. Refer to figure 29.
G. Inspect the unit on a daily basis. Check that all
systems and functions are operating normally.
Detailed inspection and testing procedures are
specified for various components at regular
intervals. Set up a chart and assign responsibility
for these items.
These instructions will
help you service the
unit. Instructions are for
a person with some mechanical ability and
training. No attempt has been made to describe all
basic steps. For example, how to loosen or tighten
fasteners. Also, basic procedures such as how to
cycle systems and check operation of the
equipment are not fully described since they are
known to anyone who does mechanical and service
work. Do not attempt to perform work beyound
your ability, or at which you have no experience.
If you need assistance or technical support, contact
an authorized COATS Service Center, or The
COATS Company Service Department at (800) 6886359.
3. Use your left hand to push against the shoe as
forcefully as possible.
4. Measure the gap between the closest point of
the shoe and the rim flange. The ideal
measurement is between 1/16” and 1/8” .
• If the shoe contacts the rim, add another shim.
• If the gap is smaller than 1/16” , add another
• If the gap is larger than 1/8” , remove one shim.
IMPORTANT: A high setting (greater than 1/8” ) is
more desirable than a low setting (less than 1/16” ).
If additional shims are required, a Shim Kit (part
#8101506) is available.
Routine Maintenance
A. Keep work surface clean. Pay special attention
to the top of the machine.
B. Clean and wipe down the machine on a regular
C. Clean the gauge lens frequently with glass
D. Make sure all fasteners are tightened securely.
E. Make certain that all guards and covers are in
F. Check for worn, damaged, or missing parts
(including grips, warnings, instructions, and
protective covers). Replace before allowing unit to
be used.
12 • COATS 4070 Tire Changer
Installation Instructions
Proper unit installation
is necessary for safe
installation also helps protect the unit from
damage and makes service easier. Always place
safety poster and instructions near the unit.
Select a location using the drawings below. The
area should provide the operator with enough
space to use the equipment in a safe manner. The
area selected should be well lit, easy to clean and
should be away from oil, grease, brake lathe chips,
etc. Avoid areas where bystanders and customers
may be present.
Workspace Requirements
Air Source
The unit requires a 5 CFM air source at 150 PSI.
The safe operating pressure range is between 110
PSI and 175 PSI at the machine.
The unit is furnished with a 1/4" pipe thread male
fitting for easy connection. This connection is
located on the right side of the rear of the
machine. A 1/4" ID hose (or pipe) for connection to
the machine is satisfactory. Sufficient air pressure
assures good performance.
Floor Mounting
The machine may be mounted to the floor if
desired. Use suitable anchors in the mounting
holes at each corner of the machine.
COATS 4070 Tire Changer • 13
Mounting and inflating the
wrong size tire can get
you hurt. Read the size on
the tire and make sure it
matches the rim. Be especially careful about putting
a smaller tire on a larger
rim, such as a 16-inch tire
on a 16.5-inch rim.
Before you put any tire on
a rim, inspect the rim for
rust, tough spots, bent
edges, or cracks that
could prevent the tire from
seating right. If you spot
any of these problems,
don’ t mount the tire until
the rim has been checked
by your shop foreman.
Inflation of a mismatched
tire and rim can cause an
Inspect the tire for bead
Once you’ ve made sure the tire is OK
and the right size and the rim is OK,
mount the tire safely. NEVER, ever
lean over the tire when you’ re inflating it. If a tire does explode, it will go
straight up. You don’ t want to be over
the tire if that happens. Also, never
over-inflate the tire, even if the bead
doesn’ t seat. Never inflate over 40
PSI. If the tire hasn’ t seated, something is wrong. Deflate the tire and
check it and the rim again. If it
doesn’ t work the second time, try
another tire.
1. Damaged Bead
or Beads.
2. Rusty Wheels.
(particularly in the
bead seat area)
3. Bent or
4 A. Mismatched.
(A mis-match of a 16inch tire to a 16.5inch rim causing an
4 B. Mismatched.
(16.5-inch tire on a
16-inch rim)
5. Walk-In Tire
and Rim.
6. Back Injuries.
7. Hand or Finger
(Hands or fingers too
close to inflating tire
or bead seats which
may cause injury.)
8. Standing Clear.
(Never put any part of
your body over the
tire changer during
9. Beads will not
Seat at 40 PSI.
10. Improper
Remember R.I.M. (Read, Inspect, Mount) for every tire.
LAVERGNE, TENNESSEE, 37086 - (800) 688-6359.
85608978 08/13
Exploding Tires, rims or other related equipment.
© Copyright 1993, 2001 Hennessy Industries and COATS®
All Rights Reserved
Printed in USA
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