Lull 6K Service Manual - Manual (Page 219)

Supply, Pressure, and Return Hydraulics
Service Manual — Models 644B, 6K, 844C, 8K, 1044C, 10K 5-75
Installation, Hydraulic Control Manifold Plugs and Cartridge Valves
(Ref. Fig. 5-45) The following procedure describes installation of the
hydraulic control manifold plugs and cartridge valves.
1. Visually inspect the hydraulic control manifold block to make sure all
cavities are free of contamination including machine burrs and chips as
well as pieces of O-rings.
2. Check two (2) 1/8” hex orifice plugs (Item 20) to make sure they are
free of visible contamination.
3. Carefully screw orifice plugs into proper cavities (orifice OR1 and
OR2). Torque to 30-40 in-lbs.
4. Check eighteen (18) hollow hex O-ring plugs (Items 10, 19, and 34) to
be sure they are free of visible contamination.
5. Carefully screw hollow hex O-ring plugs into proper cavities. Use the
following torque specifications:
6. Check each cartridge valve to be sure it is free of visible
contamination.
7. Dip cartridge valve in clean hydraulic oil up to the threads to lubricate
seals.
8. Carefully screw each cartridge into its proper cavity. Use the following
torque specifications:
Installation, Hydraulic Control Manifold Fittings and Low Brake Pressure Switch
(Ref. Fig. 5-44) The following procedure describes installation of fittings on
the control manifold.
Table 5-2: O-Ring Plug Torque Specifications for Hydraulic Control Manifold
Assembly
Ref. # Description Quantity Torque Spec.
10 1/8” Internal Hex
12 (2 on front, 3 on top, 1 on
right, 3 on left, 3 on back) 30–40 in-lbs.
19 3/16” Internal Hex
3 (1 on front, 1 on left,
1 on right) 125–145 in-lbs.
34 1/4” Internal Hex 3 (1 on top, 2 on bottom) 210–230 in-lbs.
Table 5-3: Cartridge Valve Torque Specifications for Hydraulic Control
Manifold Assembly
Ref. # Description Torque Spec.
1 Compensator Valve Cartridge (CS Port) 65 ft-lbs.
7 Check Valve Cartridge (CV Port) 180 in-lbs.
11 Poppet Type Logic Valve Cartridge (LC Port) 35 ft-lbs.
15 Priority Flow Control Cartridge (PF Port) 65 ft-lbs.
21 Pilot Directional Valve Cartridge (PD Port) 35 ft-lbs.
25 Pressure Reducing Valve Cartridge (PR Port) 35 ft-lbs.
29 Pilot Unloading Valve Cartridge (PU Port) 35 ft-lbs.