JLG Lull 1044C-54 II Series Service Manual page 159

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16. Inspect counterbalance valve cartridge (Item 8), 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 or replacing the entire cartridge.
17. Lubricate counterbalance valve cartridge O-rings with clean hydraulic
oil.
18. Install cartridge in manifold block.
19. Install O-ring plug (Item 6) in manifold block.
20. Install O-ring plug (Item 7) in manifold block.
21. Lubricate new O-ring with hydraulic oil and install inside piston (seals
rod to piston).
22. 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.
23. Slide head (Item 12) and piston (Item 10) onto rod (Item 13). Lubricate
threads on rod with hydraulic oil and install rod nut (Item 9). Torque rod
nut to 2600-2800 ft-lbs.
24. Lubricate new seal and wear rings with hydraulic oil and install on
piston.
25. Apply removable (blue) thread locking adhesive to threads on (1) set
screw (Item 11). Coat inside of barrel (Item 5) with hydraulic oil. To
avoid damaging seals during assembly, carefully insert rod and head
into barrel. Install set screw until snug.
26. Install two (2) elbows (Item 1) on cylinder manifold.
27. Lubricate grease fittings with EP lithium based grease.
Boom and Transfer
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