Coats 6401 Installation And Operating Instructions Manual - User Manual

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1601 J. P. Hennessy Drive, LaVergne, TN USA 37086-3565 615/641-7533 800/688-6359

Manual Part No.: 8144030 03

HENNESSY INDUSTRIES INC. Manufacturer of AMMCO

, COATS

and BADA

Automotive Service Equipment and Tools.

Revision:

05/04

6401

Computer

Truck Wheel Balancer

Installation Instructions

Operating Instructions

Safety 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.

ii • COATS 6401 Truck Wheel Balancer

Direct Drive

COATS 6401 Truck Wheel Balancer • iii

Table of Contents

Operator Protective Equipment . . . . . . . . .iv

Owner’s Responsibility . . . . . . . . . . . . . . . . .v

Definitions of Hazard Levels . . . . . . . . . . . . .v

Important Safety Instructions . . . . . . . . . . .vi

Before You Begin

Receiving . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1

Electrical Requirements . . . . . . . . . . . . . . . . . . . . .1

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

Standard Accessories . . . . . . . . . . . . . . . . . . . . . .2

Optional Accessories . . . . . . . . . . . . . . . . . . . . . . .2

Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2

Installation and Setup

Floor and Space Requirements . . . . . . . . . . . . . . .3

Unpack and Setup the Unit . . . . . . . . . . . . . . . . . .4

Connect to Power . . . . . . . . . . . . . . . . . . . . . . . . .5

Initial Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

Operating Overview

Control Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

Selecting Balancing Mode . . . . . . . . . . . . . . . . . . .7

Selecting Balancing Options . . . . . . . . . . . . . . . . .7

Reading the Displays . . . . . . . . . . . . . . . . . . . . . . .8

Balancing Procedures

Mount Wheel . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

Offset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

Width . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

Diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

Take Readings . . . . . . . . . . . . . . . . . . . . . . . . . . .11

Attach Weight . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

Balancing Wheels

Truck Dynamic . . . . . . . . . . . . . . . . . . . . . . . . . . .12

Truck Static . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

RV Dynamic . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

Car Dynamic . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

Wheel Mounting Options

Back Cone Mounting . . . . . . . . . . . . . . . . . . . . . .13

Front Cone Mounting . . . . . . . . . . . . . . . . . . . . . .13

Combi Adapter (Optional) . . . . . . . . . . . . . . . . . .14

Dayton Adapters . . . . . . . . . . . . . . . . . . . . . . . . .15

Special Problems . . . . . . . . . . . . . . . . . . . . .16

Maintenance and Calibration

Preventative Maintenance . . . . . . . . . . . . . . . . . .17

Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17

Contents

Important Information

Rubber Manufacturers Association

1400 K Street N. W.
Washington, DC 20005
(202) 682-4800

Tire Guides, Inc.

The Tire Information Center
1101-6 South Rogers Circle
Boca Raton, FL 33487-2795
(561) 997-9229
www.tireguides.com

Failure to follow danger, warning, and caution
instructions may lead to serious personal injury or
death to operator or bystander or damage to prop-
erty. Do not operate this machine until you read
and understand all the dangers, warnings and cau-
tions in this manual. For additional copies of either,
or further information, contact:

Hennessy Industries, Inc.

P.O. Box 3002, 1601 J.P. Hennessy Drive
LaVergne, TN 37086-1982
(615) 641-7533 or (800) 688-6359
www.Hennessy-Ind.com

Operator Protective

Equipment

Personal protective equipment helps make tire serv-

icing safer. However, equipment does not take the
place of safe operating practices. Always wear durable
work clothing during tire service activity. 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 dur-
ing 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 hear-
ing protection if tire service activity is performed in an
enclosed area, or if noise levels are high.

WARNING

Read entire manual
before assembling,
installing, operating,
or servicing this
equipment.

iv • COATS 6401 Truck Wheel Balancer

Safety

Do it Now

Make sure the instruction
and warning decal is
clean and clearly visible
to operator.

✓

COATS 6401 Truck Wheel Balancer • v

Owner’s Responsibility

To maintain machine and user safety, the responsi-

bility of the owner is to read and follow these instruc-
tions:

•

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 required.

•

Service and maintain the unit only with authorized
or approved replacement parts.

•

Keep all instructions permanently with the unit
and all decals/labels/notices on the unit clean and
visible.

•

Do not override safety features.

•

If ownership of the unit is transferred, provide
new owner all information, manuals, and provide
COATS new ownership information.

•

Warranty in non-transferable.

Definitions of Hazard

Levels

Identify the hazard levels used in this manual with

the following definitions and signal words:

DANGER

Watch for this symbol:

It Means: Immediate hazards, which will result in

severe personal injury or death.

WARNING

Watch for this symbol:

It Means: Hazards or unsafe practices, which could

result in severe personal injury or death.

CAUTION

Watch for this symbol:

It Means: Hazards or unsafe practices, which may

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 involved!

CAUTION

WARNING

DANGER

Safety

vi • COATS 6401 Truck Wheel Balancer

Safety

IMPORTANT SAFETY INSTRUCTIONS

SAVE THESE INSTRUCTIONS

READ ALL INSTRUCTIONS

Eye and face protection recommendations:

“Protective eye and face equipment is required to
be used where there is a reasonable probability of
injury that can be prevented by the use of such
equipment.” O.S.H.A. 1910.133(a) Protective gog-
gles, safety glasses, or a face shield must be pro-
vided by the owner and worn by the operator of
the equipment. Care should be taken to see that
all eye and face safety precautions are followed by
the operator. ALWAYS WEAR SAFETY GLASSES.
Everyday glasses only have impact resistant
lenses, they are not safety glasses.

Do not disable hood safety interlock system, or in
any way shortcut safety controls and operations.

Be sure that wheels are mounted properly, the
hub nut engages the arbor for not less than four
(4) turns, and the hub nut is firmly tightened
before spinning the wheel.

Read and understand this manual before operat-
ing. Abuse and misuse will shorten the functional
life.

Be sure the balancer is properly connected to the
power supply and electrically grounded.

Do not operate equipment with a damaged cord
or if the equipment has been dropped or damaged
– until it has been examined by a qualified serv-
iceman.

Do not let cord hang over edge of table, bench, or
counter or come in contact with hot manifolds or
moving fan blades.

If an extension cord is necessary, a cord with a
current rating equal to or more than that of the
equipment should be used. Cords rated for less
current than the equipment may overheat. Care
should be taken to arrange the cord so that it will
not be tripped over or pulled.

Keep guards and safety features in place and in
working order.

10. Wear proper clothing. Safety toe, non-slip

footwear and protective hair covering to contain
hair is recommended. Do not wear jewelry, loose
clothing, neckties, or gloves when operating the
balancer.

11. Keep work area clean and well lighted. Cluttered

and/or dark areas invite accidents.

12. Avoid dangerous environments. Do not use power

tools or electrical equipment in damp or wet loca-
tions, or expose them to rain.

13. Avoid unintentional starting. Be sure the balancer

is turned off before servicing.

14. Disconnect the balancer before servicing.

15. Use only manufacturer’s recommended acces-

sories. Improper accessories may result in per-
sonal injury or property damage.

16. Repair or replace any part that is damaged or worn

and that may cause unsafe balancer operation. Do
not operate damaged equipment until it has been
examined by a qualified service technician.

17. Never overload or stand on the balancer.

18. Do not allow untrained persons to operate

machinery.

19. To reduce the risk of fire, do not operate equip-

ment in the vicinity of open containers or flamma-
ble liquids (gasoline).

20. Adequate ventilation should be provided when

working on operating internal combustion
engines.

21. Keep hair, loose clothing, fingers, and all parts of

body away from moving parts.

22. Use equipment only as described in this manual.

23. Use only manufacturer’s recommended attach-

ments.

Before You Begin

Receiving

The shipment should be thoroughly inspected as soon as it is

received. The signed bill of lading is acknowledgement, by the
carrier, of receipt in good condition of the shipment covered by
our invoice.

If any of the goods called for on this bill of lading are shorted

or damaged, do not accept them until the carrier makes a nota-
tion of the shorted or damaged goods on the freight bill. Do this
for your own protection.

NOTIFY THE CARRIER AT ONCE if any hidden loss or damage

is discovered after receipt and request him to make an inspec-
tion. If the carrier will not do so, prepare an affidavit to the effect
that you have so notified the carrier (on a certain date) and that
he has failed to comply with your request.

IT IS DIFFICULT TO COLLECT FOR LOSS OR DAMAGE AFTER

YOU HAVE GIVEN THE CARRIER A CLEAR RECEIPT.

File your claim with the carrier promptly. Support your claim

with copies of the bill of lading, freight bill, invoice, and photo-
graphs, if possible.

Although COATS

responsibility ceases upon delivery of the

shipment to the carrier, we will gladly assist in tracing lost ship-
ments. Our willingness to assist in every possible manner does
not make COATS

responsible for collection of claims, or

replacement of lost or damaged materials.

Electrical Requirements

The balancer requires a 220 VAC, 60Hz, three-phase power

supply with 20 amp fuse or circuit breaker, or a 220 VAC, 60 Hz,
single-phase power supply with 20 amp fuse or circuit breaker.

The three-phase balancer is equipped with an approved cord

and a 4-prong grounding plug to fit a Hubbell 2420 or Bryant
71520 grounding receptacle (not included).

The single-phase balancer is equipped with an approved cord

and a 3-prong grounding plug to fit a Hubbell 2320 or Bryant
grounding receptacle (not included).

The receptacles should be installed by a qualified electrician in

accordance with state and local codes.

Direct Drive

COATS 6401 Truck Wheel Balancer • 1

2 • COATS 6401 Truck Wheel Balancer

Direct Drive

Specifications

• Cycle time . . . . . . . . . . . . . . . . .12 seconds (avg.)

• Max Tire Diameter . . . . . . . . . . . . . . . . .46 inches

• Max Tire Weight . . . . . . . . . . . . . . . . .200 pounds

• Rim Diameter . . . . . . . . . . . . . . . . . . . .16 inches

• Wheel Width Range . . . . . . . . . .4.5 to 25 inches

• Balancing Increments:

Truck

Car

Round Off Dynamic Static

Dynamic

Ounce

2.0

≤

4.0; .5

.25

wt>4.0; 1.0

Grams

≤

100; 10

wt>55; 10

wt>100; 20

≤

55; 5

• Resolution (Round Off Mode) . . .0.01 ounce, 1.4º

• Motor - Modified torque with 850 RPM rating,

forced air cooling, large housing for heat dissipa-
tion, and heavy duty insulation for high tempera-
ture applications

• Balancer Weight . . . . . . . . . . . . . . . . .900 pounds

• Shipping Weight . . . . . . . . . . . . . . .1,100 pounds

Standard Accessories

• 5/16 Allen Wrench

• Weight Hammer

• 6401 Threaded Stud

• Accessory Pegs

• Hood Springs

• Caliper

• Small Cone

• Medium Cone

• Large Cone

• Truck Cone

• Truck Cone Spacer

• Back Cone Spring

• Pressure Drum

• Hubnut Wrench, Large

• Hubnut Wrench, Small

• Hubnut

Optional Accessories

• Tire/Wheel Lift #0501: A roll-around hydraulic lift

for mounting tire and wheel assembly to the bal-
ancer

• Dayton Wheel Adapter for 20-22.5 Inches

• Dayton Wheel Adapter for 22-24.5 Inches

• Combi Adapter for Most Truck Wheels

• Hub

Features

• Exclusive Direct Drive System - No Belts or

Pulleys

• Will Balance Most Automotive, All Truck, RV and

Light Truck Wheels

• Backcone And Truck Cone Mounting Systems

• Single Spin Dynamic Two Plane Balance Or Static

Balance

• Vertical Wheel Mounting

• Hood Safety Interlock System

• Static, Car/RV And Truck Operating Modes

• Adjustable Control Panel

- Scratch and Solvent Resistant

- Large, Bright Digital Displays

- Easy-to-Read Position Indicators

- Large Keypad for Data Entry

- Easily Repositioned for Best Visibility

- Electronics Isolated from Motor Heat

- Automatic Memory and Program Check

• Automatic Rim Gauge Return

• Simple Calibration

• Removable Shaft Stud

• Oversized Weight Bins

• Built In Anvil for Hammering Weights

• "No Bolt-Down" Installation

COATS 6401 Truck Wheel Balancer • 3

Installation and Setup

A factory trained COATS

Service Technician must perform the

install, setup, and initial test procedures on your 6401 balancer.
Do not attempt to install and setup the unit yourself. Accurate
and reliable operation of your unit depends on proper installa-
tion. Please contact COATS

directly at 1-800-688-9240 for the

Certified Service Partner nearest you.

Floor and Space Requirements

The balancer must be located on a flat floor of solid construc-

tion, preferably concrete. The balancer must sit solidly on its
three feet. If the balancer is not level, does not sit solidly on its
three feet, or is placed on an unstable floor, the balancer will not
function properly and will produce inaccurate balance readings.

Do not operate the balancer when it is still bolted down or

while it is on the pallet.

Select a location for the balancer that provides a level, solid

floor, and adequate clearance around and above the balancer
(Figure 1). Make sure the location selected has enough room
above and behind the unit so the hood can be raised completely.
The location must also provide working room for mounting and
removing wheels.

Direct Drive

Figure 1 - Space Requirements

Unpack and Setup the Unit

Install the two (2) hood springs.

Mount hood using the three (3) hex bolts (3/8-16 UNC x 1"),

matching hex nuts and lock washers supplied in the accessory
box.

Remove the bolts holding the balancer to the pallet. With a

forklift, carefully lift the balancer off the pallet and move to final
position.

Do not use the control pod, control pod arm, face-
plate, hood or stub shaft to lift the balancer.

Install and tighten the four (4) accessory pegs and hang the

accessories.

Install and tighten the threaded stud into end of motor

shaft.

Loosen the four 5/16" nuts and raise the control pod sup-

port arm. Raise it high enough to allow room for the pod to
rotate into position and for the Match Mount instructions to
lower below the pod.

Lightly tighten the control pod support arm retainer nuts on

the side of the support bracket. Arm will be adjusted and tight-
ened later.

Loosen the two adjustment knobs on the back of the con-

trol pod (Figure 2).

Rotate the pod into operating position, and retighten the

knobs.

10.

Loosen the nuts on the support arm retainers. Raise or

lower the control pod into the desired position, and tighten the
retainer nuts securely. The bottom edge of the pod should be at
least 8 inches above the top of the balancer (Figure 3).

11.

Lower the Match Mount instructions attached to the

underside of the control pod. If there is not enough room
between the pod and the balancer weight tray to fully lower the
instruction card, the pod should be raised.

12.

Position the balancer in its final operating location. Lightly

tighten the four 5/16" nuts

CAUTION

Direct Drive

4 • COATS 6401 Truck Wheel Balancer

Figure 2 - Control Pod Adjustment Knobs

Figure 3 - Control Pod Height

8" Min.

Adjustment Knobs

Connect to Power

Your factory trained COATS

Service Technician should do the

final check to verify the power installation before connecting the
balancer to a power supply. Failure due to improper power con-
nection will void the warranty.

Connect the balancer to an appropriate electrical receptacle.

Refer to Figures 4 and 5, as well as Electrical Requirements on
page 1.

Note:

If pedestrian or equipment traffic might damage the

standard power cord, power outlets must be enclosed in a race-
way on the floor or in an overhead drop.

Note:

Electric outlets must be solidly connected. There should

be less than 1

Ω

electrical resistance between the ground pin

and earth ground. The installer or electrical inspector must ver-
ify the outlet installation before connecting the balancer.

Failure

due to improper power connection will void the warranty

Note:

The green wire in the cord is the grounding wire. Never

connect the green wire to a live terminal.

Initial Testing

This should be performed by your factory trained COATS

Service Technician.

Precautions:

Initial testing should be performed by the

instructor. Power requirements must be verified by the installer
or instructor before connecting balancer. Failure to observe this
precaution may void warranty.

Power:

Plug power cable into power outlet receptacle. Set cir-

cuit breaker in building breaker panel on. Set On/Off switch on.
Leave power on during an entire work day.

Cooling Air:

Check to verify cooling air blower is running. Do

not operate unit unless cooling air flow is present.

*Spin:

(220 VAC 3 phase units) Press START button with hood

down. Faceplate should rotate clockwise. If initial direction of
faceplate rotation is incorrect, an error message will show in the
control panel display: ERROR. Set On/Off switch off. Set build-
ing circuit breaker off. Interchange X and Y wires in outlet plug.
Set building circuit breaker on. Set On/Off switch on. Press
TRUCK button. Faceplate initial rotation should be clockwise.

*Spin:

(220 VAC single phase units) Press START button with

hood down. Faceplate should rotate clockwise for an interval
and then stop.

Note:

If the above conditions cannot be obtained during initial

test, call the distributor for service advice.

*Mount a tire/wheel assembly to avoid HUB ERR.

Direct Drive

COATS 6401 Truck Wheel Balancer • 5

Figure 4 - Three-Phase Wiring Diagram

Figure 5 - Single-Phase Wiring Diagram

Three-Phase

Ground

Hot

195-230 V
Between
Hot Wires

Hot

Single-Phase

A – Red

B – Black

Green/

Ground

6 • COATS 6401 Truck Wheel Balancer

Direct Drive

Operating Overview

Control Panel

Keypad -

User enters information and selects

function using these keys.

Wheel Measurement Display -

Displays A, W,

and D values.

Wheel Offset (A) -

The distance between the

inner rim flange and the edge of the balancer. Refer to
Offset on page 9 for detailed instructions.

Wheel Width (W) -

The width of the rim between

the inner and outer rim flanges. Refer to Width on
page 10 for detailed instructions.

Wheel Diameter (D) -

The diameter of the wheel

at the weight location. Refer to Diameter on page 10
for detailed instructions.

Calibrate -

Places the balancer in the Calibrate

Mode. Press and hold the SHIFT key, and press 1.

Round Off -

Toggles the balancer between the

high accuracy mode (0.01-ounce increments) and the
normal mode (0.25-ounce increments). Press and hold
the SHIFT key, and press 6.

Ounce/Gram -

Toggles the balancer between

ounces or grams. Press and hold the SHIFT key, and
press 9.

Mode -

Selects the desired balancing mode.

Balancing Modes -

Press the MODE key to

select from the 4 available modes. The LED above the
mode will illuminate to indicate the mode is selected.

Start Button -

Press to start a spin cycle.

Weight Displays -

Indicate the weight amount to

be attached to the wheel.

Weight Position LEDs -

Center LEDs flash when

correct weight position is at top-dead-center.

TRUCK

DYNAMIC

TRUCK
STATIC

DYN

CAR
DYN

Selecting Balancing Mode

Four balancing modes are available on the 6401. Select the bal-

ancing mode based on wheel type and customer request. Press
the mode key to select the desired balance type. The LED will
illuminate to indicate your selection. In the static mode, the bal-
ancer will automatically adjust the wheel diameter to compen-
sate for the actual location of the weight(s).

Note:

See page 12 for balancing procedures.

Car Dynamic

The most common mode used for passenger
cars and light trucks (Less than 14" diameter
tires). Selecting this mode tells the balancer
that standard clip weights will be used on the
inner and outer rim flanges.

RV Dynamic

Use this mode to balance larger wheels that do
not require balancing at 0.5 ounce or below (14"
to 16" diameter tires).

Truck Dynamic

Use this mode to balance larger wheels that do
not require balancing below 2 ounces (16"+
diameter tires).

Truck Static

Use this mode to static balance large wheels
(16"+ diameter tires). This is a two-plane static
balance.

Selecting Balancing Options

Round Off -

The default weight measurement on the balancer

is 0.25 ounces in car mode or 0.50 ounces in truck mode. The
balancer can be set to a non-Round Off mode that displays
weights in 0.01 ounce increments. Press and hold the SHIFT
key and press 6 to toggle between the Round Off and non-
Round Off modes.

Ounce/Gram -

In the default mode, the balancer will operate

in ounces. The balancer can be set to operate in grams by press-
ing and holding the SHIFT key and pressing 9. Toggle back to
ounces by using the same key sequence

COATS 6401 Truck Wheel Balancer • 7

Direct Drive

8 • COATS 6401 Truck Wheel Balancer

Reading the Displays

Weight Displays -

The two weight displays (one for the inner

plane, and one for the outer plane) are positioned with a wheel
cross section diagram. After spinning the wheel, the balancer
will calculate the weight needed and display it in these displays.
The display to the left of the diagram will show the weight to be
applied to the inner plane of the wheel and the display to the
right will show the weight for the outer plane.

Error messages and system messages will also be shown in

these displays.

Weight Position LEDs -

Each weight display includes weight

position LEDs. Located between the weight display and the
diagram, these LEDs indicate the proper location for weight
application. After a spin, rotate the wheel until the center
position indicator LEDs flash. This indicates that the position
specified by the balancer for weight application is at top-dead-
center.

Display Messages -

Both inner and outer displays will show

0.00 when the balancer is first turned on or after clearing the
memor y. The balancer may also display the following
messages:

Err -

An error was detected after the start button was

pressed. The error is in one of the wheel measurements
entered into the balancer. Check your measurements and re-
enter as needed.

Err 3 -

Circuit malfunction. Call the Hennessy Service

Department at (800) 688-6359.

Hood (hod) -

The hood has been raised during the balanc-

ing cycle. The balancer will automatically brake to a stop. The
hood must be down with the safety interlock engaged for the
balancer to spin.

Hub -

The hub nut has come loose. The balancer will auto-

matically brake to a stop when the wheel is 13 inches or
larger in diameter. Retighten the hub nut and respin.

Direct Drive

COATS 6401 Truck Wheel Balancer • 9

Direct Drive

Balancing Procedures

Mount Wheel

Choose the correct mounting method:

Back Cone Mounting: Use only small or medium cones
(See page 13).

Front Cone Mounting: Any cone can be used (See page 13).

Combi Adapter: Where center cone mounting cannot be
used due to an oversized center hole of rim (See pages 14).

Adapts to: 275 mm (10.827") Bolt circle, 8 hole rims.

11 1/4" Bolt circle, 10 hole rims.

335 mm (13.188") Bolt circle, 10 hole rims.

Dayton Adapters 20" & 22.5", 22" & 24.5": For use with truck
spoke wheels only (See page 15).

Offset

Press the offset key.

Move distance gauge to
touch edge of wheel.

Read this dis-

tance measurement
on the arm.

Enter offset

distance using the
keypad.

10 • COATS 6401 Truck Wheel Balancer

Direct Drive

Width

Press the width key. Use

Rim Width Calipers to measure
wheel at points shown.

Read the

width reading
on the calipers.

Enter wheel

width information
using the keypad.

Diameter

Press the diameter key.

Read rim diameter size as
read from tire sidewall.

Enter diameter

using the keypad.

Take Readings

Weight and position readings will appear on displays as

balancer is braking tire.

Attach Weight

Rotate wheel until right (outer) red position lights begin to

flash.

Attach a weight equal to outer weight reading at top

dead center of outer rim (see #2).

Rotate wheel until left (inner) red position lights begin to

flash.

Attach a weight equal to inner weight reading at top dead

center of inner rim (see #4).

Respin wheel after weights are applied to obtain 0.00

reading.

COATS 6401 Truck Wheel Balancer • 11

Direct Drive

Note:

The more accurate you are in selecting

the exact weight and position, the more often
you will balance in one spin.

0::0

12 • COATS 6401 Truck Wheel Balancer

Direct Drive

Balancing Wheels

Truck Dynamic

Select Truck Dynamic mode using the keypad.

Set distance gauge, wheel width and wheel diam-

eter as indicated in BALANCING PROCEDURES.

Lower hood and push START.

Raise hood and attach weight as indicated in BAL-

ANCING PROCEDURES.

Lower hood. Respin wheel to obtain 0.00 reading.

Truck Static

Note:

This method is equivalent to a bubble balance.

Select Truck Static mode using the keypad.

Set distance gauge, wheel width and wheel diam-

eter as indicated in BALANCING PROCEDURES.

Lower hood and push START.

Raise hood and attach weight as indicated in BAL-

ANCING PROCEDURES.

Note:

Use two standard clip weights to

split

the

weight on the inner and outer rim.

Note:

One weight, using the total imbalance amount,

may be used on the inside.

Note:

If one tape weight is desired on the drop cen-

ter then set the rim diameter “D” 1 1/2" smaller than
tire size.

Lower hood. Respin wheel to obtain 0.00 reading.

RV Dynamic

Select RV Dynamic mode using the keypad.

Set distance gauge, wheel width and wheel diam-

eter as indicated in BALANCING PROCEDURES.

Lower hood and push START.

Raise hood and attach weight as indicated in BAL-

ANCING PROCEDURES.

Lower hood. Respin wheel to obtain 0.00 reading.

Car Dynamic

Select Car Dynamic mode using the keypad.

Set distance gauge, wheel width and wheel diam-

eter as indicated in BALANCING PROCEDURES.

Lower hood and push START.

Raise hood and attach weight as indicated in BAL-

ANCING PROCEDURES.

Lower hood. Respin wheel to obtain 0.00 reading.

START

Standard clip
weight will be
attached here.

COATS 6401 Truck Wheel Balancer • 13

Direct Drive

Wheel Mounting Options

Hubnut must engage threads for at least four full turns.
Failure to tighten hubnut securely or to force wheel
firmly against the faceplate may result in serious per-
sonal injury.

Back Cone Mounting

Use only small or medium cones.

Place spring over threaded stud with the large end inside

of the faceplate. Spring must be used.

Select a cone that best fits into wheel center hole.

Use only small or medium cones. If a larger cone is
required, use the front cone mounting system.

Slide selected cone onto threaded shaft with the large

end against the spring.

Lift wheel onto shaft and center on cone.

Slide pressure drum onto threaded shaft with the large end

against the wheel.

Thread hubnut on and tighten with hubnut wrench. If hubnut

won't tighten all the way down, use the front cone mounting sys-
tem. The wheel must be forced firmly against the faceplate.

If you still can't tighten hubnut because of a lack of threads, use

an additional cone to act as a spacer between the hubnut and pres-
sure drum.

Front Cone Mounting

Can be used with all cones (do not use spring). This method works

well with most truck wheels where the bolt circle is less than 275
mm.

Select a cone that best fits into wheel center hole.

Lift wheel onto threaded shaft.

Slide selected cone onto shaft with the small end against

the wheel.

By lifting wheel from bottom, center on cone.

Thread hubnut on and tighten with hubnut wrench. If hubnut

won't tighten all the way down, remove cone and wheel. Slide truck
cone spacer over faceplate and repeat steps 2 thru 5. The wheel
must be forced firmly against the faceplate.

If you still can't tighten hubnut because of a lack of threads,

use an additional cone to act as a spacer between the hubnut and
existing cone.

CAUTION

Direct Drive

14 • COATS 6401 Truck Wheel Balancer

Combi Adapter (Optional)

Determine the correct hole pattern by comparing the rim to

the adapter. Wheels with the largest bolt circle (335 mm) should
be fastened to the large diameter side of the reversible adapter-
all others should be fastened to the small diameter side (see
illustration below).

Fasten threaded studs from back of adapter using the 5/16

Allen wrench. Leave enough threads to securely fasten hex nuts
and lock washers.

Slide lock washers on. Hold the studs in place with the 5/16

Allen wrench while threading the hex nuts on, then tighten
them down with a 5/16 wrench.

Mount the adapter onto the faceplate by inserting the two

(2) drive pins of the adapter into the matching holes in the face-
plate.

Slide truck cone onto shaft with the small end inside the

center hole of the adapter. Mount by front cone method only.

Thread hubnut on and tighten with hubnut wrench. The

adapter must be forced firmly against the faceplate.

Mount the wheel onto the adapter's lugs. Fasten wing nuts

by hand then securely tighten them with a rubber mallet. Wheel
must be forced firmly against the faceplate.

Wing nuts must engage threads for at least six full
turns. Hubnut and cone must force wheel and
adapter firmly against the faceplate. Failure to
tighten hubnut or wingnuts securely may result in
serious personal injury.

CAUTION

Dayton Adapters

Dayton Wheel Adapter (110785)

- This adapter fits duplex rims

(18 x 22.5 tires) for steering axles, and standard rims from 20"
to 22.5".

The adapter mounts on a Dayton rim from the front side. On a

rim used in a dual wheel application, mount the adapter where
the spacer would have been placed. For a rim used on a steer-
ing axle application, mount the adapter where the wheel clamps
would have been placed.

Fully retract the adapter centering rods by turning the

eccentric to the left (counterclockwise).

Loosen the clamps and turn them to a position parallel with

the edge of the adapter.

Set the adapter into the front side of the rim. Center the

valve stem between clamps.

Center the adapter in the rim by turning the eccentric.

Insert the spanner wrench into the slot in the eccentric and turn
it to the right (clockwise).

Reach through from the front of the rim and turn the

clamps until they are 180º in relation to the clamping surface on
the backside of the rim.

Tighten the clamps finger tight from the front side of the

adapter. When clamps are finger tight use a 3/4" open end or
box wrench to tighten all the clamps securely. A 1/2 to 3/4 turn
is usually sufficient. Do not use an air wrench.

The wheel is now ready to be mounted on the balancer. Use

the appropriate cone to fit the center hole. Remove the adapter
by reversing the installation instructions.

Accessory Kit (110786)

- Contains additional parts to modify

the 110785 adapter to fit 22" and 24.5" rims.

Remove the wear plates from the three arms.

Remove the clamps from the arms.

Install the three arm extensions and rod extensions.

Install the longer clamps.

The adapter will now fit 22" and 24.5" demountable wheels.

Install the adapter according to the steps provided for 20" and
22.5" rims.

Hubnut and cone must force adapter firmly against
the faceplate. Failure to tighten hubnut or rim clamp
nuts securely may result in serious personal injury.

CAUTION

Direct Drive

COATS 6401 Truck Wheel Balancer • 15

Space variation between edge
of outer flange wall and edge
of marker not to exceed 3/32".

Do not gage
to edge of
flange.

Special Problems

Customers will occasionally complain of vibration on the car

after balancing. Some possible causes are listed below:

Beads improperly seated. Check bead seating and inflation

pressure before balancing spin.

Stiffness variations in radial belts.

Tire out of round; wheel out of round, bent, or not running

true. Visually check runout of wheel and tire during balance spin.
Re-check mounting. Replace wheel or tire if necessary.

Suspension wear, misalignment, or loose vehicle compo-

nents.

Wheels not correctly centered due to damaged hub, dam-

aged or worn center hole, worn bolt circle holes, or imprecise
original design. Check wheel run out before balance spin and on
the vehicle after mounting.

Sensitive suspensions. Set the balancer to a non-Round Off

mode (See page 6).

Complaint:

Balancer uses too many weights or several spins

to balance.

Remedy:

Recheck rim dimensions entered. Position the

weights exactly top dead center when red position lights are on.

Complaint:

Weight or position readings fluctuate.

Remedy:

Check cone/hubnut for slippage. Check the balancer

is resting firmly on three mounting points, floor is flat and sta-
ble, and that no tools or weights are between balancer and floor.

Direct Drive

16 • COATS 6401 Truck Wheel Balancer

COATS 6401 Truck Wheel Balancer • 17

Maintenance and

Calibration

Preventative Maintenance

The balancer requires only minor maintenance to

keep the unit operating properly.

NEVER use compressed air or a water hose
to clean any part of your balancer.

Keep the display clean and clear. Use a vaporizing

cleaner only. Do not use cleaners or solvents, which
leave oily or filmy residues behind.

Keep the adapters, cones, faceplate, threaded

arbor, pressure cup, and hub nut clean. Grease and
dirt buildup will cause premature wear and inaccurate
balancing. Clean at least once a day with a vaporizing
solvent.

Clean the weight tray, accessory post, and pegs.

Weights stored in a dirty tray will pick up grease and
dirt which may alter their weight or keep them from
securely attaching to the wheel. Use a vaporizing sol-
vent to clean the tray, pegs, and post.

Keep the area around the balancer clear. Remove

any tools or other items that are leaning against the
balancer. Keep the area under the balancer clear as
well. Remove any items that may cause the balancer
to not sit level.

Use only COATS accessories. Accessories from

other manufactures may not fit or function properly,
and may damage the balancer.

Calibration

The balancer utilizes a “self calibration” scheme. To

keep your balancer in proper calibration, this calibra-
tion procedure should be performed once a month, or
whenever the accuracy of the balancer is questioned.

Mount a 16 or 16.5 light truck tire/wheel assem-

bly on the balancer.

Enter A, W, and D wheel measurements.

Note:

Make sure the balancer is in NON ROUNDOFF

mode (SHIFT 6).

Remove any weights attached to the wheel. The

balancer will read CAL 0.

Press and hold SHIFT and press 1.

Lower the hood and press START.

Raise the hood, rotate the wheel until the outer

weight positioning LED flashes, and attach an 8 ounce
weight (227 grams) at top-dead-center.

Note:

It is critical that this weight be placed accu-

rately to achieve proper calibration.

Lower the hood and press START.

Raise the hood and remove the weight.

The balancer is now calibrated. If a mistake is made

during this procedure, turn the balancer off, then back
on, and start the procedure over again.

CAUTION

Direct Drive

8144030 03 06/04

Printed in USA

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