JLG 510AJ Service Manual - Manual (Page 270)

SECTION 5 - HYDRAULICS AND HYDRAULIC SCHEMATICS
5-50 – JLG Lift – 3121181
1. Position the 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, mak-
ing shaft installation difficult.
2. Remove retaining ring from housing.
3. Pull out seal carrier assembly.
4. Remove O-ring from seal carrier. To install new shaft
only, proceed to step 8.
5. Place seal carrier in an arbor press with shaft bearing
side down. Press out old seal. An appropriately 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 contamination.
Polish sealing area on shaft if necessary.
NOTE: If shaft is not being replaced go to step 11.
7. Press new seal in shaft bearing side of seal carrier. Seal
lip must face outside of pump. Do not damage seal. Out-
side diameter of seal may be coated with a sealant (e.g.
Loctite High Performance Sealant #59231) before instal-
lation. This aids in preventing leaks caused by damage
to seal bore in seal carrier. Remove shaft and roller bear-
ing assembly from pump or motor. Bearing assembly
can be transferred to the new shaft (steps 9 and 10).
8. Remove retaining ring that secures roller bearing assem-
bly with a snap ring pliers. Remove roller bearing assem-
bly. Place roller bearing assembly on new shaft and
secure with retaining ring.
9. Place roller bearing assembly on new shaft and secure
with retaining ring.
10. Wrap spline or key end of shaft with thin plastic to pre-
vent damage to seal lip during installation. 64 Lubricate
inside diameter of shaft seal with petroleum jelly.
11. Place O-ring on shaft bearing and lubricate with petro-
leum jelly.
12. 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.
13. Install retaining ring.
.
1. Key
2. Shaft Assembly
3. Retaining Ring 4. Roller Bearing
5. Shaft
Figure 5-87. Shaft Components