COATS 1100 Series Balancer - Manual (Page 20)

16 • Important: Always read and follow instructions.
Match Balance (Optimization)
Match Balance involves the loosening of
tire beads and the inflation of a tire. Training
is necessary in tire changer operation and
understanding the dangers involved dur-
ing bead seating and tire inflation before
attempting this stage of the Match Balance
procedure. Read the operators manual sup-
plied with the tire changer and consult a
supervisor.
Use the Match Balance (Tire/Rim Weight Optimization)
program to determine the best mating of tire and rim
that will result in the least amount of total unbalance of
the assembly. It requires two spins and two rotations
of the tire on the rim. Match Balance may be needed
when:
• The customer complains of ride problems.
• The balancer calculates a high out of balance.
• The balancer calls for Total Static weights in excess
of 3 ounces (85 grams) on passenger car tires.
Important: A high unbalance may indicate the
improper mounting of the assembly on the balancer, or
a rim that is out of round or misformed, or a tire with a
bubble or other problem. If the unbalance is excessive,
it may be prudent to replace the rim, the tire, or both. If
either is replaced, do not continue with Match Balance.
Balance the new tire and rim and evaluate the readings.
Match Balance Mode
If you choose to use Match Balance to correct for a
condition, such as a large static unbalance, then follow
the machine prompts and instructions for the MATCH
BALANCE procedure as outlined in the following steps.
Note: Use this procedure only after the wheel has
spun and the corrective weight amount is displayed.
Note: Use the Total Static display option. See Balance
Options, page 14, for further details.
1. Press Match to select the Match Balance mode. A
“1” will appear in the Outboard weight display.
2. Raise the hood and rotate the wheel until the valve
stem is at top-dead-center. Mark the tire sidewall at the
valve stem.
3. Press Function on the control panel; a “2” will
appear in the Outboard weight display.
4. Remove the wheel assembly from the balancer.
5. Using a tire changer, rotate the tire 180 degrees
on the rim.
6. Remount wheel assembly on the balancer. Press
Function on the control panel; a “3” will appear in the
Outboard weight display.
7. Lower the hood. The wheel spins; a “4” will appear
in the Outboard weight display.
8. When the wheel stops spinning, raise the hood
and rotate the wheel until the valve stem is at top-dead-
center.
9. Press Function on the control panel. Weight
amounts appear on the control panel.
The amount in the Inboard weight display is the weight
imbalance for the rim. The amount in the Outboard
weight display is the weight imbalance for the tire. Use
these weight amounts to determine the suitability of
the rim or tire.
Note: If either the rim or the tire weight amount is
close to zero or zero then using Match Balance will not
affect the total unbalance of the assembly.
10. Rotate the wheel until the Outboard weight posi-
tion bar flashes. Mark the tire at top-dead-center.
11. Remove wheel assembly from balancer.
12. Using a tire changer, rotate the tire until the mark
is aligned with the valve stem.
13. Remount the wheel assembly on the balancer.
14. Press Function to exit Match Balance. Select a
balancing mode and balance the wheel assembly.