JLG 450A II Series, Service And Maintenance Manual

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SECTION 5 - HYDRAULICS
5-64 – JLG Lift – 3121290
1. Position pump with shaft facing up.
NOTE: If unit is positioned horizontally when shaft is removed, cyl-
inder block could move out of place, making shaft installa-
tion 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 bearing
side down and 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.
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 helps prevent 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.
9. Remove retaining ring from roller bearing assembly with
snap ring pliers. Remove roller bearing assembly.
Figure 5-113. Shaft Components
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 pre-
vent damage to seal lip during installation. Lubricate
inside diameter of shaft seal with petroleum jelly.
3. Place O-ring on shaft bearing and lubricate with petro-
leum 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