Lull 6K Service Manual - Manual (Page 284)

Boom and Transfer
6-34 Service Manual — Models 644B, 6K, 844C, 8K, 1044C, 10K
6. Remove the two (2) O-rings (Items 10 and 12) from the spool retainer
(Item 11) and the O-ring (Item 14) from the spool cap (Item 15).
Discard all O-rings.
7. Clean all removed parts with solvent and dry with compressed air.
Inspect for damage and replace if necessary.
Note: The spool (Item 9) and the spool housing (Item 13) cannot be purchased
separately. If they are damaged, purchase of an entire valve section is
necessary.
8. Lubricate and install new O-ring (Item 14) on spool cap (Item 15).
9. Install new O-rings (Items 10 and 12) on the spool retainer (Item 11).
Lubricate each O-ring before installing it.
10. Install the spool retainer (Item 11) on the spool subassembly (Items 4
thru 9 ) .
11. Screw the spool cap (Item 3) into the spool retainer. Torque spool cap
to 154–166 ft-lbs.
12. Set aside this assembly and continue with “General Overhaul” .
General Overhaul
Fig. 6-21: Boom Hydraulic Control Valve Assembly
# Description
1 Hex Nut
2 Hex Nut
3 Tie Rod
4 Tie Rod
5 Outlet Section Housing
6 O-ring
7 Spring
8 Poppet
# Description
9 Spool Housing
10 Plug
11 O-ring
12 Inlet Section Housing
13 Relief Valve Assembly
14 Hex Nut
15 Hex Nut
K
1108
1 4
3
6 7
8
9
6
6
14
13
11
12
7
9
10
5
8
2
15