Lull 6K Service Manual - Manual (Page 203)

Supply, Pressure, and Return Hydraulics
Service Manual — Models 644B, 6K, 844C, 8K, 1044C, 10K 5-59
Disassembly, Outlet Cover
(Ref. Fig. 5-37) The following procedure describes disassembly of the
outlet cover.
1. Loosen and remove long connector (Item 1) from outlet cover (Item 3).
2. Loosen and remove hollow hex plug (Item 2) from outlet cover.
3. Remove four (4) O-rings (Items 4 and 5) from outlet cover. Discard
O-rings.
4. Clean remaining parts with solvent and dry with compressed air.
Inspect for damage and replace, if necessary.
Assembly, Outlet Cover
(Ref. Fig. 5-37) The following procedure describes reassembly of the
outlet cover.
1. Obtain valve section seal kit. Lubricate each O-ring with hydraulic oil
before installing it.
2. Install new O-ring (Item 4) in upper port. Please note that this O-ring is
smaller than the other three.
3. Install three (3) new O-rings (Item 5) in lower ports.
4. Install hollow hex plug (Item 2) on outlet cover and torque plug to
80–90 ft-lbs.
5. Install long connector (Item 1) on outlet cover and torque connector to
105–115 ft-lbs.
Disassembly, Inlet Cover
(Ref. Fig. 5-37) The following procedure describes disassembly of the inlet
cover.
1. Loosen and remove connector (Item 11) and elbow (Item 10) from inlet
cover (Item 9).
2. Loosen and remove diagnostic plug (Item 6) from hollow plug (Item 7).
Remove plug from inlet cover.
3. Loosen and remove hex plug (Item 8) from inlet cover.
4. Clean all parts with solvent and dry with compressed air. Inspect for
damage including O-rings on fittings and plugs. Replace if necessary.
Note: The diagnostic plug and hollow hex plug cannot be purchased separately. If
either of these is damaged, it will be necessary to replace both of them.