Caster Wheels; Caster Adjustment - Yale 524150797 Maintenance Manual

4000 YRM 1509

CASTER ADJUSTMENT

WARNING
In normal operation, the casters should continu-
ously contact the floor. As the drive tire wears,
the frame will move closer to the floor and the
casters will carry more of the load. If the casters
are not periodically adjusted, they will bear too
much of the lift truck's weight and reduce the load
on the drive tire necessary to maintain traction.
This can interfere with the drive tire's ability to
control the steering and stopping functions of the
truck.
Periodically, the casters must be adjusted to compen-
sate for drive tire wear/replacement. Excess rocking is
often a sign of under adjusted casters. This may oc-
cur when a new drive tire is installed. Loss of traction
may be caused by over adjusted casters. This may
occur when the drive tire diameter has decreased be-
cause of regular wear. The casters ideally should be
level with the bottom of the drive tire (just touching the
floor). A gap of not more than 1.50 mm (0.06 in.) be-
tween the caster wheels and the floor is acceptable,
as is the casters being compressed to the floor not
more than 1.50 mm (0.06 in.). Refer to the following
instructions for the proper caster checking and adjust-
ment procedures.
NOTE: The casters include an eccentric mounting of
the caster wheels to facilitate adjustment.
1. Park the lift truck on a smooth and level surface
with the control handle centered and with no load
on the forks. Lower the forks completely.
2. Turn the key switch to the OFF position and dis-
connect the battery (DO NOT remove the bat-
tery).
3. Place the lift truck on blocks on both side of the
drive frame. See
• Periodic Maintenance 8000YRM1510
for lift truck model A249

Caster Wheels

•
4. Loosen the wheel axle capscrews on either side
of the caster wheel until the adjuster can be
pulled away from the caster assembly clear of the
adjustment pin. See Figure 3.
5. Rotate the adjuster up or down to adjust the cas-
ter wheel up or down.
6. Unless the drive wheel or caster wheel is being
replaced, it should only be necessary to move the
adjuster up or down one notch of the adjuster.
7. Push the adjuster into engage the adjustment pin.
8. Tighten the axle capscrews.
9. Remove the left truck from the blocks and check
the casters for proper contact with the floor.
10. Connect the battery, turn the key switch to the ON
position, and test for proper operation.
1. ADJUSTMENT PIN
2. ADJUSTER
3. AXLE CAPSCREW
Periodic Maintenance 8000YRM1666
for lift truck model A245
Figure 3. Caster Adjustment
Caster Wheels
3