JLG 660SJ ANSI Service Manual - Manual (Page 92)

SECTION 3 - CHASSIS & TURNTABLE
3-38 – JLG Lift – 3120718
3.7 DRIVE MOTOR (600A 2WD)
Shaft Seal Replacement
Lip type shaft seals are used an the drive motors. These
seals can be replaced without major disassembly of the
unit. However, replacement of the shaft seal requires
removal of the pump or motor from the machine.
1. Remove the retaining ring from the housing.
Carefully remove the seal from the housing bore. The face
of the seal may be punctured with a sharp instrument
(such as a screw driver) to aid in prying the seal out, or a
slide hammer type puller may be used to remove the seal.
Care must be taken not to damage the housing bore or
shaft. Once removed the seal ia not reusable.
Prior to installing the new seal, inspect the sealing area on
the shaft for rust, wear, or contamination. Polish the seal-
ing area on the shaft if necessary.
Wrap the spline or key end of shaft with thin plastic to pre-
vent damage to the seal lip during installation. Lubricate
the inside diameter of the new seal with petroleum jelly.
NOTE: The outside diameter of the seal may be lightly
coated with a sealant (such as Loctite High Perfor-
mance Sealant #59231) prior to installation This will
aid in preventing leaks caused by damage to the
housing seal bore.
Slide the new seal over the shaft and press it into the
housing bore. Be careful not to damage seal. A seal
installer tool can be made to aid in installing the seal.
Reinstall the seal retaining ring.
3.8 DRIVE MOTOR ADJUSTMENT
PROCEDURE (S MODELS ONLY, PRIOR
TO S/N 75606)
1. Remove the cap nut from adjustment screw.
2. Loosen jam nut on the adjustment screw and make
adjustment.
3. Measure from top of jam nut to the end of adjust-
ment screw. Refer to Figure 3-21., Drive Motor
Adjustment (S Models Prior to S/N 75606).
4. Tighten jam nut, install cap nut.
NOTE: The “o” ring must be seated in groove in cap nut.
Figure 3-21. Drive Motor Adjustment (S Models Prior to S/N 75606)