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3F-4 WHEELS AND TIRES
GENERAL BALANCE PROCEDURES
Deposits of mud, etc. must be cleaned from inside of rim.
WARNING:
Stones should be removed from the tread in order to avoid operator injury during spin balancing and
to obtain good balance.
Each tire should be inspected for any damage, then balanced according to equipment manufacturer's recom-
mendation.
OFF-VEHICLE BALANCING
Most electronic off-vehicle balancers are more accurate than the on-vehicle spin balancers. They are easy to
use and give a dynamic (two plane) balance. Although they do not correct for drum or disc unbalance as does
on-vehicle spin balancing, this is overcome by their accuracy, usually to within 1/8 ounce.
ON-VEHICLE BALANCING
On-vehicle balancing methods vary with equipment and tool manufacturers. Be sure to follow each manufac-
turer's instructions during balancing operation.
WARNING:
Wheel spin should be limited to 35 mph (55 km/h) as indicated on speedometer.
This limit is necessary because speedometer only indicates one-half of actual wheel speed when one
drive wheel is spinning and the other drive wheel is stopped.
Unless care is taken in limiting drive wheel spin, spinning wheel can reach excessive speeds. This
can result in possible tire disintegration or differential failure, which could cause serious personal
injury or extensive vehicle damage.
CAUTION:
For vehicle equipped with ABS, using on-vehicle balancing method with ignition switch ON may set
malfunction diagnostic trouble code (DTC) of ABS even when system is in good condition.
Never turn ignition switch ON while spinning wheel.
Dynamic balance, as shown in left figure, is the equal distribution
of weight on each side of the wheel centerline so that when the
tire spins there is no tendency for the assembly to move from side
to side. Wheels that are dynamically unbalanced may cause
shimmy.
1. Heavy spot wheel shimmy
2. Balance weights addition point
3. C/L of spindle
[C] : Before correction
[D] : Corrective weights
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