JLG 450A_AJ Series II Service Manual - Manual (Page 327)

SECTION 5 - HYDRAULICS
3121180 – JLG Lift – 5-37
1. Position pump with shaft facing up.
NOTE: If the unit is positioned horizontally when the shaft is
removed, the cylinder block could move out of
place, making shaft installation difficult.
2. Remove retaining ring from housing.
3. Pull out seal carrier assembly.
4. Remove O-ring from seal carrier. To install a new
shaft only, go to step 8.
5. Place seal carrier in an arbor press with shaft bear-
ing side down and press out old seal. An appropri-
ately sized pipe spacer or socket wrench can be
used as a press tool. Seal is not reusable.
6. Inspect seal carrier and new seal for damage.
Inspect sealing area on shaft for rust, wear, or con-
tamination. Polish sealing area on shaft if necessary.
7. Press new seal into shaft bearing side of seal carrier.
Seal lip must face outside of pump. Be careful not to
damage seal. Outside diameter of seal may be
coated with a sealant (e.g. Loctite High Performance
Sealant #59231) before installation. This aids in pre-
venting leaks caused by damage to seal bore in seal
carrier. If shaft is not being replaced go to step 11.
8. Remove shaft and roller bearing assembly from
pump or motor. Bearing assembly can be trans-
ferred to the new shaft (steps 9 and 10).
9. Remove retaining ring that secures roller bearing
assembly with a snap ring pliers. Remove roller
bearing assembly.
1. Place roller bearing assembly on new shaft and
secure with retaining ring.
2. Wrap spline or key end of shaft with thin plastic to
prevent damage to seal lip during installation. Lubri-
cate inside diameter of shaft seal with petroleum
jelly.
3. Place O-ring onto shaft bearing and lubricate with
petroleum jelly.
4. Slide seal carrier assembly over shaft and into housing
bore. Press against O-ring. Hold inward pressure
against shaft to compress cylinder block spring while
pressing seal carrier into place.
5. Install retaining ring.
1. Key
2. Shaft Assembly
3. Retaining Ring 4. Roller Bearing
5. Shaft
Figure 5-39. Shaft Components