Lull 944E-42 Service Manual - Manual (Page 445)

8.193 Model 644E-42/944E-42 Rev. 6/04
Hydraulic System
b. Auxiliary Hydraulic Pressure Release Valve
Disassembly, Inspection and Reassembly
Note: Use new oiled o-rings as required. ALWAYS
replace seals, o-rings, gaskets, etc., with new parts to
help ensure proper sealing and operation. Lubricate
seals and o-rings with clean hydraulic oil.
Note: Torque all the fittings as specified in Section 2.3,
“Torques.”
1. Remove the elbow fitting (17) from the “1” port on
the block (18) and the two elbow fittings (19) from
the T block (20).
2. Remove the straight fitting (21) on the T block (20)
from the “2” port on the valve block.
3. Remove the solenoid cartridge (22) from the valve
block.
4. Clean all components with a suitable cleaner before
inspection.
5. Inspect internal passageways of the auxiliary
hydraulic pressure release valve and its component
parts for wear, damage, etc. If inner surfaces of the
auxiliary hydraulic pressure release valve DO NOT
display an ultra-smooth, polished finish, or
components are damaged in any way, replace the
auxiliary hydraulic pressure release valve or
appropriate part. Often, dirty hydraulic fluid causes
failure of internal seals and damage to the polished
surfaces within the auxiliary hydraulic pressure
release valve.
6. Secure the auxiliary hydraulic pressure release valve
block (18) in a bench vise or by other suitable
means.
7. Install straight fitting (21) into auxiliary hydraulic
pressure release valve block (18). Torque to
24-26 lb-ft (32-35 Nm).
8. Install the T block (20) onto the auxiliary hydraulic
pressure release valve block (18). Torque to
24-26 lb-ft (32-35 Nm).
9. Install elbow fittings (17) into port “1” and two elbow
fittings (19) onto the T block (20). Torque to
24-26 lb-ft (32-35 Nm).
10. Install the solenoid cartridge (22) into the valve
block. Torque the solenoid to 20 lb-ft (27 Nm).
Replace solenoid (23) and solenoid nut (24). Torque
the solenoid nuts to 5 lb-ft (7 Nm).
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MU5850
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MU5970
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