COATS 1250 Series Balancer - 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
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 calls for Total Static weights in excess
of 3 ounces (85 grams) on passenger car tires.
Note: 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 bub-
ble 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
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 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
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 1 on the control panel; a “ 2” will appear in
the outboard weight display.
4. Remove the wheel assembly from the balancer.
The Match Balance involves the loosening
of tire beads and the inflation of a tire.
Training is necessary in tire changer opera-
tion and understanding the dangers
involved during bead seating and tire infla-
tion before attempting this stage of the
Match Balance procedure. Read the opera-
tors manual supplied 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.
The Match Balance involves the loosening
of tire beads and the inflation of a tire.
Training is necessary in tire changer opera-
tion and understanding the dangers
involved during bead seating and tire infla-
tion before attempting this stage of the
Match Balance procedure. Read the opera-
tors manual supplied 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 assembly.
WARNING
WARNING