JLG 740A, Service And Maintenance Manual

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SECTION 4 - BOOM & PLATFORM
4-26 – JLG Lift – 3121160
4. Using a torch, apply heat to the setscrews on the
bottom of actuator.
5. Remove the two (2) setscrews (4) from bottom of the
actuator (1). Discard setscrew.
6. Place two (2) 3/8"x16 NC bolts in threaded holes in
bottom of the actuator. Using a suitable bar, unscrew
the end cap (5). Remove the end cap from actuator
(1).
7. Remove the shaft (2) from piston sleeve (3) and the
actuator housing (1).
8. Remove piston sleeve (3) from housing (1).
9. Remove all seals and bearings from grooves. Dis-
card seals.
Inspection
1. Clean all parts thoroughly.
2. Closely inspect all parts for excessive wear, cracks
and chips. Replace parts as necessary.
NOTE: A small amount of wear in the spline teeth will have
little effect on the actuator strength. New spline sets
are manufactured with a backlash of about 0.005 in.
per mating set. After long service, a backlash of
about 0.015 per set may still be acceptable in most
cases, depending on the required accuracy of the
application.
3. Check the ring gear for wear and weld damage to
the pins.
4. Inspect the cylinder bore for wear and scratches.
Heating Setscrews
Removing Setscrew
Removing End Cap
Removing Shaft from Housing
Removing Sleeve From Housing