COATS Series XR 1800 Balancer - Manual (Page 27)

Important: Always read and follow the on-screen operating instructions. • 21
Video Balancer
Optimization (Match Balance)
The 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. Optimization 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.
To set the wheel balancer to automatically detect an
excessive static unbalance, press the button,
select the GENERAL SET-UP option , and set the
EXCESSIVE STATIC UNBALANCE option to ON. A
screen (see fig. 37A) will appear when the excessive
static unbalance is detected.
Figure 37A - Excessive Static Unbalance Screen
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 optimization.
Balance the new tire and rim and evaluate the read-
ings.
To check for machine/wheel mounting errors, select
CHECK MTG. at the Excessive Static Unbalance
screen and follow the on-screen instructions.
If you choose to use Optimization, then select the
key for the menu screen, and then select the
OPTIMIZATION (MATCH BALANCE) option .
Follow the on-screen instructions for the TIRE/RIM
WEIGHT OPTIMIZATION procedure as outlined in
the following steps.
Figure 37B - Tire/Rim Weight Optimization Screen
Note: Use this procedure only after the wheel has
spun and weights are displayed.
1. Rotate arrow on faceplate to 12 o’clock. Place a
mark (backside of the wheel) on the rim at 12 o’clock.
Press the NEXT option
.
2. Remove the wheel assembly from the balancer.
3. Using a tire changer, rotate the tire 180 degrees
on the rim.
4. Replace wheel assembly on balancer and align the
faceplate arrow with the mark on rim. Lower the hood
and press the NEXT option
. The wheel spins.
5. Rotate the wheel until a red box appears at the
yellow arrows. Put a second mark (frontside of wheel)
on the rim at 12 o’clock.
6. Rotate the wheel until a red box appears at the
green arrows. Put a third mark (frontside of wheel) on
the tire at 12 o’clock. Press the NEXT option
.
Note: The rim unbalance and tire unbalance values
are displayed on the screen.
7. Remove wheel assembly from balancer.
8. Using a tire changer, align the mark on the rim
with mark on the tire.
9. Replace the wheel assembly on the balancer.
Align the faceplate arrow with the previous mark (back-
side) on the rim to check improvement or just continue
with step 10.
10. Press NEXT option and balance the assembly. 1
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