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OPERATION AND MAINTENANCE
7550 Disc Wheel Bearing
Maintenance
Center Frame
Center frame wheel bearing maintenance should be
performed at the beginning of every season. Check
periodically for excessive endplay. If needed, adjust or
replace hub and components using the following
procedure
(See Figure
4-18.),
NOTE
Center frame hubs can be greased until grease
purges seals without damage to seal.
1. Lower machine until tires are off the ground, the
depth stop may have to be adjusted to allow cylinders
to retract far enough.
2. Remove tires.
3. Remove hub cap and catch lubricant.
4. Straighten tab of star washer, remove outer spindle
nut, star washer, spindle locking washer, inner
spindle nut and bearing. Remove hub from spindle.
5. Using an appropriate driver, remove inner bearing
cone and seal.
6. Clean and inspect the bearings and hub cavity.
Replace any worn or defective parts.
7. Repack the bearings using a high-quality wheel
bearing grease. Apply grease to bearing cups and a
liberal amount to the center void.
8. Install inner bearing and seal, using the correct seal
driver, into hub.
9. Place the hub over the spindle being careful to align
the hub bore with the spindle to prevent seal
damage. Support the hub until the outer bearing
cone and spindle nut are installed.
10. Torque inner nut to 100 ft.-lbs. while rotating hub to
insure proper seating of bearings and cups.
11. Loosen the inner spindle nut to remove preload
torque.
12. Hand tighten the inner adjustment nut until contact is
made with bearing.
13. Install the spindle nut lock washer so that the dowel
on the inner nut will align with a hole in the lock
washer and washer tang fits in the spindle keyway.
NOTE
The spindle lock washer may be flipped over if
needed to achieve a closer match to aligning with the
dowel on the inner nut. Inner nut may also need to be
rotated slightly for alignment.
4-18
14. Install the star washer aligning tang with spindle
keyway.
15. Apply grease to one side of the outer nut and install
with grease to the star washer side.
16. Torque outer nut to 300 ft-lbs. Endplay of .001" to
.010" must be present in the adjust wheel bearing
assembly.
17. Bend over two tabs of star washer that is aligned with
a flat on the outer nut to prevent rotation.
18. Grease interior of cap lightly to prevent any
corrosion.
19. Install the hub cap with the proper gasket. Tighten
the cap screws of the hub cap to 15 to 20 ft-lbs of
torque.
20. Reinstall tires, making sure wheel spacer is on hub.
Wing Frame
Wheel bearing maintenance should be performed at the
beginning of every season of use. Check the wheel
bearings periodically for excessive end play. If needed,
adjust or replace them using the following procedure
(See Figure
4-18.),
1. Lower machine to the ground, enough to raise tires
off the ground. It may be necessary to adjust depth
stop to get tires off the ground.
2. Remove the tire.
3. Remove the hub cap, cotter pin, slotted nut and
washer.
4. Remove the hub. Clean and inspect the bearings and
hub cavity. Replace any worn or defective parts.
IMPORTANT
It is recommended to replace the seal any time the
hub is removed from the spindle.
5. Repack the bearings using a high-quality wheel
bearing grease.
6. Slide the seal onto the spindle. Do not install the seal
into the hub.
7. Slide the inner bearing cone and hub onto the
spindle.
8. Install the outer bearing cone, washer and slotted
nut.
9. Tighten the slotted nut while rotating the hub until
there is a slight resistance to wheel rotation. Then,
back the slotted nut off one notch, until the wheel
rotates freely without end play.
10. Slide the seal to the hub and install the seal in the
hub.
F-987-0519
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