JLG 600SC_660SJC Service Manual - Manual (Page 291)

SECTION 8 - HYDRAULICS
3121157 – JLG Lift – 8-31
1. Position the pump with the 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 the retaining ring from the housing.
3. Pull out seal carrier assembly.
4. Remove the O-ring from the seal carrier. To install a
new shaft only, proceed to step 8.
5. Place the seal carrier in an arbor press with the shaft
bearing side down, and press out the old seal. An
appropriately sized pipe spacer or socket wrench
can be used as a press tool. Once removed, the seal
is not reusable.
6. Inspect the seal carrier and the new seal for dam-
age. Inspect the sealing area on the shaft for rust,
wear, or contamination. Polish the sealing area on
the shaft if necessary.
7. Press the new seal into the shaft bearing side of the
seal carrier. The seal lip must face the outside of the
pump. Be careful not to damage the seal. The out-
side diameter of the seal may be coated with a seal-
ant (e.g. Loctite High Performance Sealant #59231)
prior to installation. This aids in preventing leaks
caused by damage to the seal bore in the seal car-
rier. If the shaft is not being replaced proceed to
step 11.
8. Remove the shaft and roller bearing assembly from
the pump or motor. The bearing assembly can be
transferred to the new shaft (steps 9 and 10).
9. Remove the retaining ring that secures roller bearing
assembly with a snap ring plier. Remove the roller
bearing assembly. Place roller bearing assembly on
new shaft and secure with the retaining ring.
10. Place roller bearing assembly on new shaft and
secure with the retaining ring.
11. Wrap the spline or key end of shaft with thin plastic
to prevent damage to the seal lip during installation.
64 Lubricate the inside diameter of the shaft seal
with petroleum jelly.
1. Key
2. Shaft Assembly
3. Retaining Ring 4. Roller Bearing
5. Shaft
Figure 8-28. Shaft Components