COATS 6450 3D - Manual (Page 22)

16 • Important: Always read and follow the information box instructions.
Match Balance (Optimization)
The Match Balance (Tire/Rim Weight Optimization)
procedure is used to determine the best mating of tire
and rim that will result in the least amount of total unbal-
ance 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.
Note: A high unbalance may indicate the improper
mounting of the assembly on the balancer, or a rim that
is out of round or malformed, 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 information box instructions for the MATCH BAL-
ANCE 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 BAL-
ANCE OPTIONS, page 11, for further details.
1. Press and hold the SHIFT key and press 5 to select
the Match Balance mode. A “1” will appear in the out-
board 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 1 on the control panel; a “2” will appear in
the outboard weight display.
4. Remove the wheel assembly from the balancer.
WARNING
The 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.
5. Using a tire changer, rotate the tire 180 degrees
on the rim.
6. Remount wheel assembly on the balancer. Press
2 on the control panel; a “3” will appear in the outboard
weight display.
7. Lower the hood and press START. The wheel
spins.
8. When the wheel stops spinning, raise the hood
and rotate the wheel until the valve stem is at top-dead-
center.
9. Press 4 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.
WARNING
The 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.
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 NEXT or START to exit Match Balance.
Select a balancing mode and balance the wheel assem-
bly.