Page 14
4.6 CORRECTION OF THE IMBALANCE
NOTE: Before spinning the wheel make sure proper
eye protection is worn by all personnel in the vicinity of
the balancer.
A. Spin the wheel by lowering the wheel guard or by
pressing the
Enter button. When the balancing cycle
is completed the wheel will stop automatically and the
imbalance values will appear on the LED’s.
NOTE: Do not use the foot operated shaft lock as a
brake, it is intended to be used only to prevent shaft
rotation while placing corrective weights.
B. Read the imbalance value on the outer display. Val-
ues are displayed in ounces but can be displayed in
grams if required and are automatically rounded to the
nearest commercial wheel weight.
4.6.1 PLACING THE CORRECTIVE WEIGHT
Raise the wheel guard and turn the wheel until the dis-
plays of the outer plane imbalance position indicator
are illuminated green. Apply the wheel weight at twelve
o’clock position. Use the foot operated shaft lock to pre-
vent shaft rotation while placing weights.
C. Correct the imbalance on the inner plane in the same
manner.
4.7 VERIFICATION OF THE RESULTS
Lower the wheel guard to spin the wheel again and
check that the readout is “0.00” “0.00” If a residual
imbalance is displayed:
A. Check the rim parameters, if entered value is incor-
rect, correct as needed. Imbalance values will be re-
computed after re-spinning wheel.
B. Check if the balancing mode selected is the most
appropriate. If not, choose the right mode and respin.
C. The wheel weight could have been placed at a wrong
position. To check this, position the wheel at the cor-
rection position for the outer plane. If the wheel weight
previously attached is in sector ‘L’ or ‘R’ ( Figure25),
move the wheel weight up about 1” (2.54cm).
If the wheel weight is in sector ‘D’ cut a piece of the
wheel weight of an approximate value corresponding
to the value shown on the right display, or replace the
wheel weight with a lighter one.
If the wheel weight is in sector ‘U’ add a weight of value
indicated by the display or replace the wheel weight
with a heavier one. Repeat the same operation for the
inner plane.
NOTE: If this situation is repeated, your machine may
be out of calibration and a calibration operation might
be required as instructed on page 21.
D. If an
ALU function was selected ensure that the wheel
weights have been placed in accordance to the pro-
gram chosen.
E. Check that the quick nut is tight and that the wheel is
not slipping against the backing collar.
F. Check that the wheel and adaptors are clean.
Figure 25
4.8 VIBRATION PROBLEMS
If vibration is still present after balancing, check the fol-
lowing possible sources of vibration:
1. Stones caught in the tire tread.
2. Tire slippage on the wheel.
3. Incorrectly mounted wheel.
4. Imbalanced wheel covers.
5. Excessive radial or lateral runout in the tire or
wheel.
6. Damaged wheel bolt holes.
7. Worn universal joints.
8. Imbalanced brake rotors or drums.
9. Worn or damaged balancer accessories.
Summary of Contents for VPI System
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