Lull 6K Service Manual - Manual (Page 544)

Frame Tilt and Oscillation
7-42 Service Manual — Models 644B, 6K, 844C, 8K, 1044C, 10K
(Ref. Fig. 7-25) Follow the guidelines for cleanliness as stated in Section 5
of this manual. The following procedures are for the disassembly, cleaning,
and assembly of the frame tilt lockout valve.
Disassembly, Frame Tilt Lockout Valve
1. Remove two (2) fittings (Item 8) from valve body (Item 9).
Frame Tilt Override Press. Switch 2. Remove frame tilt override pressure switch (Item 7). Place wrench on
hex fitting at base of switch. Do not apply torque to body of switch.
Solenoid Valve 3. Remove nut (Item 2) and solenoid coil (Item 1) from solenoid valve
(Item 3). Remove solenoid valve.
4. Remove plug (Item 13) and shuttle valve (Item 12).
Cleaning and Inspection, Frame Tilt Lockout Valve
1. Remove O-rings and backup rings from solenoid valve (Item 3) and
shuttle valve (Item 12). Clean these components with solvent and dry
with compressed air. Inspect components for condition and
cleanliness. Ball in shuttle valve must move freely.
2. Thoroughly flush valve body (Item 9) with solvent and dry with
compressed air.
3. Clean remaining components (except solenoid coil and pressure
switch) with solvent and dry with compressed air.
Assembly, Frame Tilt Lockout Valve
1. Install new O-ring (Item 11) and backup rings (Item 10) on shuttle valve
(Item 12). Follow assembly sequence as shown in Fig. 7-25. Lubricate
O-ring with hydraulic oil.
2. Install shuttle valve (Item 12) in valve body (Item 9). Torque shuttle
valve to 95–120 in-lbs.
3. Install plug (Item 13) and torque to 125–145 in-lbs.
Solenoid Valve 4. Install large O-ring (Item 4) on solenoid valve (Item 3). Install backup
rings (Item 5) and O-ring (Item 6) on solenoid valve (Item 3). Follow
assembly sequence as shown in Fig. 7-25. Lubricate O-rings with
hydraulic oil.
5. Install solenoid valve (Item 3) and torque to 215–240 in-lbs.
6. Install solenoid coil (Item 1) on solenoid valve so lettering is away from
valve body. Install nut (Item 2) and torque to 55–60 in-lbs.
Frame Tilt Override Press. Switch 7. Install frame tilt override pressure switch (Item 7). Place wrench on hex
fitting at base of switch. Do not apply torque to body of switch. Torque
switch to 130–150 in-lbs.
8. Install fittings (Item 8) and torque to 205–235 in-lbs.