Lull 6K Service Manual - Manual (Page 281)

Boom and Transfer
Service Manual — Models 644B, 6K, 844C, 8K, 1044C, 10K 6-31
Installation
Boom Hydraulic Control
Valve (Control Manifold
System)
644B-37 (S/N 101–590, 592–666)
644B-42 (S/N 101–207)
6K-37 (S/N 101–317)
6K-42 (S/N 101–119)
844C-42 (S/N 101–621)
8K-42 (S/N 101–220)
1044C-42 (S/N 101–116)
1044C-54 (S/N 101–154)
10K-42 (S/N 101–106)
10K-54 (S/N 101–103) (Ref. Fig. 6-18) The following procedures describes installation of the
boom control valve.
1. Install boom control valve (Item 9) on valve plate (Item 12) with four (4)
each hex head capscrews (Item 3) and lockwashers (Item 4). Make
sure that the last capscrew installed secures the mounting bracket
(Item 5) to the boom control valve. Tighten capscrews to 55 ft-lbs.
2. Clean hydraulic hose and tube ends with solvent and dry with
compressed air.
3. Reconnect the hydraulic hoses (Item 8) to the elbows/tees on both
ends of the boom control valve. Torque to 235–265 in-lbs.
4. Reconnect the hydraulic tube (Item 10) to the two (2) connectors on
the boom control valve (Item 9) and control manifold block (Item 11).
Torque to 117–125 ft-lbs.
5. Reconnect the hydraulic return hose (Item 6) to the elbow on the boom
control valve with the hose clamp (Item 7). Tighten until snug.
6. Reconnect the two (2) lower hydraulic hose swivel elbows (Item 2) to
the short connectors on the top of the boom control valve. Torque
swivel nuts on elbows to 79–88 ft-lbs.
7. Reconnect the two (2) upper hydraulic hose swivel elbows (Item 1) to
the long connectors on the top of the boom control valve. Torque swivel
nuts on elbows to 79–88 ft-lbs.
Overhaul
Boom Hydraulic Control
Valve (Control Manifold
System)
644B-37 (S/N 101–590, 592–666)
644B-42 (S/N 101–207)
6K-37 (S/N 101–317)
6K-42 (S/N 101–119)
844C-42 (S/N 101–621)
8K-42 (S/N 101–220)
1044C-42 (S/N 101–116)
1044C-54 (S/N 101–154)
10K-42 (S/N 101–106)
10K-54 (S/N 101–103) The following overhaul procedure for the boom hydraulic control valve
assembly is broken down into the following areas:
• Fitting removal
• Boom control valve disassembly
• General overhaul
• Boom control valve reassembly
• Relief valve assembly
• Fitting installation