JLG Lull 1044C-54 II Series Service Manual page 165

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14. Inspect counterbalance valve cartridge (Item 5), including O-rings, for
condition and replace as necessary. Do not disassemble the cartridge.
Service to counterbalance valve cartridges is limited to installing new
O-rings and replacing the entire cartridge.
15. Lubricate counterbalance valve cartridge O-rings with clean hydraulic
oil.
16. Install cartridge in manifold block.
17. Lubricate new O-ring with hydraulic oil and install inside piston (seals
rod to piston).
18. Lubricate new O-ring, backup ring, seals, and wear rings with hydraulic
oil and install on head. Using a seal driver, install new wiper seal in
head. Lubricate wiper seal with hydraulic oil.
19. Slide head (Item 13), tube (Item 12), and piston (Item 11) onto rod
(Item 9). Lubricate threads on rod with hydraulic oil and install rod nut
(Item 6). Torque rod nut to 2600-2800 ft-lbs.
20. Lubricate new seal and wear rings with hydraulic oil and install on
piston.
21. Apply removable (blue) thread locking adhesive to threads on (1) set
screw (Item 3). Coat inside of barrel (Item 7) with hydraulic oil. To avoid
damaging seals during assembly, carefully insert rod and head into
barrel.
22. Install two (2) connectors (Item 1) on cylinder manifold.
23. If necessary, grease fittings (Items 4 and 10) from cylinder. Inspect and
replace if damaged. Install and tighten fittings 1.5 to 3 turns past finger
tight.
24. Lubricate grease fittings with EP lithium based grease.
Boom and Transfer
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