JLG 740A, Service And Maintenance Manual

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SECTION 3 - CHASSIS & TURNTABLE
3121160 – JLG Lift – 3-61
housing. Apply just enough heat to remove screw, do not
over heat the motor housing or mounting flange.
6. Remove the mounting flange from the motor hous-
ing. The exclusion seal, pressure seal, and back - up
ring will come off with the mounting flange.
7. Carefully remove the exclusion seal, pressure seal,
and back - up ring from the mounting flange. A seal
removal tool may be fabricated by bending and
rounding the end of a small blade screwdriver.
DO NOT DAMAGE THE MOUNTING FLANGE WHERE THE SHAFT
PASSES THROUGH IT.
Reassembly
Check all mating surfaces. Replace any parts with
scratches or burrs that could cause leakage. Wash all
metal parts in clean solvent. Blow them dry with pressur-
ized air. Do not wipe parts dry with paper towels or cloth.
Lint in a hydraulic system will cause damage. Check the
key way and chamfered area of the output shaft; remove
any nicks, burrs, or sharp edges that could damage the
shaft seal during assembly.
NOTE: Always use new seals when reassembling hydraulic
motors.
DURING REASSEMBLY LUBRICATE THE NEW SEALS WITH A
PETROLEUM JELLY LIKE VA SELINE. ALSO LUBRICATE
MACHINED SURFACES AND BEARINGS WITH CLEAN HYDRAULIC
FLUID.
1. Remove all of the old Loctite from the mounting
flange cap screws and their threaded holes. The
threads must be clean and dry for the new Loctite to
hold properly.
2. Lubricate and install the output shaft, needle thrust
bearing, and bearing race into the housing.
DO NOT PERMIT OIL TO GET INTO THE FOUR THREADED HOLES.
3. Lubricate the exclusion seal and press it into its seat
in the mounting flange.
4. Lubricate and install the back - up ring and pressure.
Use a seal installation tool to press the pressure seal
into place.