Lull 6K Service Manual - Manual (Page 628)

Outriggers
10-10 Service Manual — Models 644B, 6K, 844C, 8K, 1044C, 10K
15. Inspect inner surface of barrel, outer surface of piston, and length of
rod for scratches and scoring. If the barrel, piston, or rod are damaged,
they must be replaced.
16. Check the condition of the threads on the rod, nut, and capscrews. Do
not attempt to repair damaged threads.
17. Inspect the counterbalance valve cartridges (Items 3 and 8), including
O-rings, for condition and replace as necessary. Do not disassemble
cartridges. Service to counterbalance valve cartridges is limited to
installing new O-rings and replacing the entire cartridge.
18. Lubricate counterbalance valve cartridges O-rings with clean hydraulic
oil.
19. Install cartridges in the manifold block.
20. Lubricate a new O-ring with hydraulic oil and install it inside the piston
(seals rod to piston).
21. Lubricate new seal and wear rings with hydraulic oil and install them on
the piston.
22. Slide the cylinder cap (Item 16), stroke limiter (Item 18), and piston
(Item 11) onto the rod (Item 15). Lubricate the threads on the rod with
hydraulic oil and install the rod nut (Item 10).
23. Install the rod assembly in the cylinder barrel. Tighten the cylinder cap
and secure with a setscrew (Item 17).
24. Install two (2) elbows (Item 7) on the cylinder manifold block. Torque
the elbows to 40–44 ft-lbs.
25. For models with an O-ring plug (Item 5), install the plug in the control
manifold block. Torque the plug to 85–95 ft-lbs.
26. Install the differential pressure switch (Item 6) on the cylinder manifold
block.
Differential Pressure Switch
Description
The differential pressure switch is a cartridge-style switch with a maximum
operating pressure of 6000 psi. It is a normally open circuit that is set to
close at 92 psi (+0, -18 psi).