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SERVICING ROTOR, HUB OR BEARINGS
- Block brake pedal in the up position. Raise vehicle and remove hub cap, nut, washer and outer
bearing.
- Slide wheel assembly from steering knuckle. In some cases, it may be necessary to loosen brake
adjustment.
- Do not drag seal or inner bearing over steering knuckle thread (thread, bearing and oil seal
may be damaged).
- Remove oil seal and inner bearing from hub.
- Thoroughly clean bearings and interior of hub, removing all old grease. To clean bearings,
soak them in cleaning solvent. Strike the flat of the bearings against a hardwood block several
times; immersing the bearings in solvent between the blows to iar and wash old particles of
hardened grease from bearing. Repeat this operation until bearings are clean. Dry the bearings
with compressed air but do not spin them. After cleaning, oil the bearings with engine oil.
Turn the bearings slowly while applying pressure to test them for pitting and roughness.
Replace all worn or defective bearings. lf bearing shows pitting or roughness, replace cups and
bearing. If bearings are suitable for further use, remove engine oil, pack with Multi-Purpose
NLGI, Grade 2 EP grease or equivalent, ancl place them in a clean covered container until ready
for installation. If a bearing packer is not available, hand pack grease into all cavities
between cage and rollers.
- If bearings and cups are to be replaced, remove cups from the hub with a brass drift or
suitable remover.
- Replace bearing cups with appropriate installing tool.
- Install inner bearing in grease coated hub and install new grease seals with a seal installer.
Leather seals should be soaked in light oil for 30 minutes and then rolled with a smooth round
bar before installation. This will make the leather soft and pliable and insure a tight seal
without leaks.
- Pack hub cavity with grease level full across bearing cup IDs.
- Before installing wheel and hub assembly, inspect steering knuckle bearing and seal surfaces
for burrs or roughness.
- Smooth all rough surfaces. Coat with Multi-Purpose NLG1, Grade 2 E.P. grease or equivalent.
- Install wheel carefully to prevent damage to seal, bearing or to steering knuckle threads.
- When wheel and hub assembly is in position, install outer bearing. washer and nut, adjust
according to procedure outlined under, "Adjusting Hub Bearings" in this group. Install hub cap.
- Lower vehicle, remove block from brake pedal and test vehicle operation.
- Block brake pedal in the up position. Raise vehicle and remove wheel and tire assembly. Remove
mounting bolts from caliper.
- Separate caliper from rotor and insert block of wood between brake pads to prevent hydraulic
fluid leak. Support caliper out of the way. Do not allow caliper to hang by hydraulic hose.
- Remove hub cap, nut, washer and outer bearing.
- Carefully slide rotor assembly from steering knuckle. Do not drag seal or inner bearing over
steering knuckle thread (thread, bearing and oil seal may be damaged). Remove oil seal and inner
bearing.
- Thoroughly clean bearings and interior of rotor, removing all old grease. To clean bearings,
soak them in cleaning solvent. Strike the flat of the bearings against a hardwood block several
times; immersing the bearings in solvent between the blows to jar and wash old particles of
hardened grease from bearing. Repeat this operation until bearings are clean. Dry the bearings
with compressed air but do not spin them. After cleaning, oil the bearings with engine oil. Turn
the bearings slowly while applying pressure to test them for pitting and roughness. Replace all
worn or defective bearings. If bearing shows pitting or roughness, replace cups and bearing. lf
bearings are suitable for further use, remove engine oil, pack with MuIti·Purpose NLGl, Grade 2
EP grease or equivalent, and place them in a clean covered container until ready for installation.
lf a bearing packer is not available, hand pack grease into all cavities between cage and rollers.
- If bearings and cups are to be replaced, remove cups with a brass drift or suitable remover.
- Replace bearing cups with appropriate installing tool.
- Install inner bearing in grease coated rotor and install new grease seals with a seal installer.
Leather seals should be soaked in light oil for 30 minutes and then rolled with a smooth round bar
before installation. This will make the leather soft and pliable and insure a tight seal without
leaks.
- Pack hub cavity with grease level full across bearing cup IDs.
- Before installing rotor assembly, inspect steering knuckle bearing and seal surfaces for burrs or
roughness.
- Smooth all rough surfaces. Coat with Multi-Purpose NLG1, Grade 2 E.P. grease or equivalent.
- Carefully slide rotor assembly onto steering knuckle. Do not drag seal or inner bearing over
steering knuckle thread (thread, bearing and oil seal may be damaged). Install outer bearing,
washer and nut, adjust according to procedure outlined under, "Adjusting Hub Bearings" in this
group. Install hub cap.
- Remove block separating brake pads on caliper. Position caliper over rotor and install and
tighten mounting bolts. See, "Tightening Reference" for proper torque.
- Install and tighten wheel and tire assembly. See, "Tightening Reference" for proper torque.
Lower vehicle, remove block from brake pedal and test vehicle operation.
- Tighten adjusting nut to 50 foot-pounds to seat bearing.
- Back adjusting nut off 1/6 to 1/4 of a turn. (Nut should not be more than finger-tight.) Do
not back off less than 1/6 of a turn.
- Install cotter key to lock in place.
- Raise vehicle clear of floor and install suitable stands.
- Remove axle shaft.
- Remove outer nut and lockring.
- While rotating wheel and tire assembly tighten adjusting nut until a slight bind is evident. Back off augusting nut 1/6 turn so that wheel will rotate fri ~ly without excessive end play.
- Install lockring and jam nut. CAUTION: Take care when drawing up iam nut to avoid affecting bearing adiustment due Io forcing adiusting nut forward on threads.
- Install new gasket and axle shaft.
- Remove stands and lower vehicle.
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