JLG 740A, Service And Maintenance Manual

Page: 129 / 408

SECTION 3 - CHASSIS & TURNTABLE
3121160 – JLG Lift – 3-77
2. Lubricate output shaft with hydraulic oil, then install
shaft in housing.
DO NOT PERMIT OIL TO GET INTO THE FOUR TAPPED HOLES.
3. Install needle thrust bearing, then bearing race on
shaft. Pull shaft partially out of housing. Push all
three parts in housing together. The bearing race
must rotate freely when in position.
4. Install exclusion seal in flange. Carefully press exclu-
sion seal into place.
5. Visually check seal seat in mounting flange for
scratches or other marks that might damage the
pressure seal. Check for cracks in flange that could
cause leakage.
6. Lubricate I.D. of seal tube and O.D. of shaft pressure
seal with light film of petroleum jelly. Align small I.D.
end of seal tube with seal seat in mounting flange.
Install back-up ring and pressure seal in tube with lip
seal face up. Insert seal driver in tube and firmly
push seal seat with a rotating action.
AFTER INSTALLING SEAL IN FLANGE, EXAMINE SEAL CONDI-
TION. IF DAMAGED OR IMPROPERLY INSTALLED, YOU MUST
REPLACE IT BEFORE CONTINUING WITH REASSEMBLY.
7. Install 49 mm (1.937 in.) I.D. seal in flange.
8. It is recommended to apply a light coat of Loctite
Primer NF in tapped holes of housing. Allow primer
to dry for at least 1 minute. Do not force dry with air
jet; the primer will blow away.
Use of primer is optional. With primer, curing time is
approximately 15 minutes. Without primer curing
time is approximately 6 hours.
9. Apply 3 or 4 drops of Loctite sealant at top of
threads for each of the four holes in housing. Do not
allow parts with Loctite applied to come on contact
with metal parts other than those for assembly.Wipe
off excess Loctite from housing face, using a non
petroleum base solvent.
Do not apply Loctite to threads more than 15 min-
utes before installing screws. If housing stands for
more than 15 minutes, repeat application. No addi-
tional cleaning or removal of previously applied Loc-
tite is necessary.