JLG Lull 1044C-54 II Series Service Manual page 158

Boom and Transfer
6-16
a. Place socket wrench over counterbalance valve cartridge (Item 8).
Wrap a clean shop rag around the socket to cover the area of the
counterbalance valve cartridge.
b. Carefully and slowly, turn cartridge out of manifold block to release
pressure in cylinder.
3. Remove the counterbalance valve cartridge.
4. Slowly extend and retract cylinder by hand to remove most of the
hydraulic oil.
5. Remove one (1) set screw (Item 11) securing rod bearing head
(Item 12) to barrel.
6. Remove cylinder rod (Item 13) from cylinder barrel (Item 5).
CAUTION: To prevent possible damage to components, support rod and
head; do not wiggle rod or head back and forth during
removal.
7. Remove rod nut (Item 9), piston (Item 10), and rod bearing head from
cylinder rod.
8. Remove two (2) O-ring plugs (Items 6 and 7).
9. Remove the two elbows (Item 1) from the cylinder manifold block.
10. Inspect bushings for damage. The following steps are necessary if
bushing(s) need to be replaced:
a. Remove bushing (Item 4) from cylinder barrel (Item 5) and/or
remove bushing (Item 14) from cylinder rod (Item 13) using a
bushing driver and hammer or press.
b. Install new bushing so that it is centered in axle boss.
c. To ensure proper lubrication, make sure an adequate amount of
grease is applied to the grease fitting(s) after cylinder is reinstalled
on machine.
11. If necessary, remove grease fitting covers (Items 2 and 16) and grease
fittings (Items 3 and 15) on the cylinder. Inspect and replace if
damaged. Install and tighten fittings 1.5 to 3 turns past finger tight.
12. Remove all O-rings, wear rings, and backup rings from cylinder
components and discard.
13. Thoroughly clean components with solvent and dry with compressed
air.
14. Inspect inner surface of barrel, outer surface of piston, and length of
rod for scratches and scoring. If barrel, piston, or rod is damaged, it
must be replaced.
15. Check condition of threads on rod, nut, and capscrews. Do not attempt
to repair damaged threads.
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