TM 10-3930-641-20
REPAIR AND REPLACEMENT PROCEDURES (CONT)
(Sheet 2 of 3)
Make sure the chamfered side of the bearing faces the shoulder when installing bearings against shoulders. Before pressing bearings into place, lubri-
cate them and all metal surfaces they contact. Put pressure only on the part of the bearing that directly contacts the mating part.
Always use the proper tools and fixtures for removing and installing bearings. Special tools and fixtures that are needed are listed in the manual.
Bearings do not usually need to be removed. Remove bearings only if it is necessary.
SLEEVE BEARINGS
Do not remove a sleeve bearing unless it is damaged, very worn, or loose in its bore. If you must remove a sleeve bearing, press it out.
When pressing or driving, put pressure right in line with the bore. Use a bearing driver or a bar with a smooth flat end to drive a bearing. Never use a
hammer.
If there are oil holes, make sure they are alined.
GASKETS
Always replace used gaskets with new gaskets. Never use the same gasket twice. Make sure the gasket holes match up with holes in the mating part.
If gasket must be made, make sure to cut holes to match up with the mating part. Use material that is the right type and thickness.
Serious damage to the machine can happen if any holes on the part are blocked by the gasket.
LIP TYPE SEALS
Lip seals are usually used to seal oil or grease. To seal in oil, the lip is usually put facing toward oil to be sealed. To seal grease, the lip usually faces
away from grease.
Seals should not be removed. Only remove seals to get at other parts or if the seal is damaged or worn.
Leaking oil or grease usually means that a seal is damaged and needs to be replaced. Replace leaking seals so that bearings don't overheat. If seal is
removed, replace with new seal.
Soak new rawhide seals in warm oil for one-half hour before using them, if possible. Put in wiper edge seal with wiper edge turned in direction recom-
mended. When putting seals in place, use shims around shafts and shoulders.
Go onto Sheet 3
2-148
