Lull 944E-42 Service Manual User Manual download pdf (Page 457)

100

101

8.205

Model 644E-42/944E-42 Rev. 6/04

Hydraulic System

3. Remove the load shuttle cartridge (8).

4. Remove the accumulator charge logic cartridge (9).

This cartridge has two settings: Low Setting 1050 psi

(72 bar) and High Setting 1950 psi (134 bar).

5. Remove the 2450 psi (168 bar) direct acting relief

valve (10).

6. Remove the inverted shuttle cartridge (11).

7. Remove the pilot directional cartridge (12). Remove

the orifice disc (13) from the port.

8. Loosen the filter nut (14), remove the filter retainer

(15), washer (16) and sintered filter (17) from the

port. Remove the o-ring (18) from the filter retainer

and discard the o-ring.

9. Remove the load sense compensator (19).

10. Remove the check valve cartridges (20).

11. Remove the 550 psi (37 bar) pressure reducing

cartridge (21).

12. Remove the coil assembly (22).

13. Remove the accumulator brake pressure switch (23).

14. Clean all components with a suitable cleaner before

inspection.

15. Inspect internal passageways of the accumulator

charge/secondary function valve and its component

parts for wear, damage, etc. If inner surfaces of the

accumulator charge/secondary function valve DO

NOT display an ultra-smooth, polished finish, or

components are damaged in any way, replace the

accumulator charge/secondary function valve or

appropriate part. Often, dirty hydraulic fluid causes

failure of internal seals and damage to the polished

surfaces within the accumulator charge/secondary

function valve.

Note: 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.

16. Secure the accumulator charge/secondary function

valve (7) in a bench vise or by other suitable means.

17. Install the load shuttle cartridge (8), with new seals,

and torque to 20 lb-ft (27 Nm). Refer to Parts Manual

for seal kits.

18. Install the accumulator charge logic cartridge (9),

with new seals, and torque to 28 lb-ft (38 Nm). Refer

to Parts Manual for seal kits.

19. Install the direct acting relief valve (10), with new

seals, and torque to 20 lb-ft (27 Nm). Refer to Parts

Manual for seal kits.

20. Install the inverted shuttle cartridge (11), with new

seals, and torque to 28 lb-ft (38 Nm). Refer to Parts

Manual for seal kits.

21. Place the orifice disc (13) in the port and install the

pilot directional cartridge (12), with new seals, and

torque to 20 lb-ft (27 Nm). Refer to Parts Manual for

seal kits.

22. Install the new sintered filter (17) followed by the

washer (16) into the port. Secure in place with the

filter retainer (15) and o-ring (18). Torque the retainer

to 18 - 22 lb-ft (24 - 30 Nm). Tighten the filter nut (14)

and torque to 27 - 29 lb-ft (37 - 39 Nm).

23. Install the load sense compensator (19), with new

seals, and torque to 50 lb-ft (68 Nm). Refer to Parts

Manual for seal kits.

24. Install the two check valves (20), with new seals, and

torque to 20 lb-ft (27 Nm). Refer to Parts Manual for

seal kits.

25. Install the pressure reducing cartridge (21), with new

seals, and torque to 20 lb-ft (27 Nm). Refer to Parts

Manual for seal kits.

26. Install the coil assembly (22), with new seals, and

torque to 20 lb-ft (27 Nm). Refer to Parts Manual for

seal kits.

27. Install the accumulator brake pressure switch (23)

with new seals and torque to 15 ±1 lb-ft (20 ±1 Nm).

Refer to Parts Manual for seal kits.

MU2000

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Lull 944E-42 Service Manual User Manual Page 457

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