Lull 944E-42 Service Manual User Manual download pdf (Page 485)

100

101

8.233

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

Hydraulic System

11. Apply Loctite Primer “T” and Threadlocker #271

(red), to a new locknut (7) in accordance with Loctite

instructions. Install the nut onto the threaded end of

the rod (6). Torque the nut to 1840-2025 lb-ft

(2495-2745 Nm).

IMPORTANT: Avoid using excess force when clamping

the cylinder in a vise. Apply only enough force to hold the

cylinder securely. Excessive force can damage the

cylinder tube (5).

12. Fasten the tube (5) in a soft-jawed vise or other

suitable holding device.

13. To aid in installation, lubricate the o-rings and the

inside of the tube, piston and head gland with clean,

filtered hydraulic oil.

IMPORTANT: Use a suitable installation tool or

compression sleeve to help prevent twisting or damaging

the seals and o-rings when installing the piston (8) and

head gland (4) into the cylinder. When sliding the rod

and piston assembly in the tube, DO NOT damage the

piston by scraping it against the threads in the tube.

Keep the rod in line with the tube to prevent binding.

14. Keep the rod (6) straight and carefully insert the rod

into the tube (5). Avoid scratching, nicking or

damaging the tube while installing the rod.

15. Begin threading the head gland (4) into the tube (5).

Place the locking insert (3) in its hole in the head

gland threads just before the head gland is threaded

into the tube. Use a suitable pin spanner wrench to

thread the head gland (4) completely into the

tube (5). Torque the head gland to 300-400 lb-ft

(407-542 Nm).

16. Lubricate the pilot-operated check valves (2) with

clean, filtered hydraulic oil. Using all new seals,

thread the pilot-operated check valves into tube (5).

Torque valves to 35-40 lb-ft (47,2-54,2 Nm). Refer to

the Parts Manual for seal kits.

17. Press the polylube bearings (21) into the base end

of the cylinder tube.

18. Reinstall the two hex plugs (22). Apply Loctite

Threadlocker #243 to the threads and torque to 10-

12 lb-ft (14-16 Nm).

19. Test the cylinder at low operating pressure

(100 psi or 6,9 bar) to verify that the piston and rod

move freely in both directions.

20. Increase the operating pressure to the maximum for

the cylinder (4000 psi or 275 bar) and check for external

leakage and for free movement in both directions.

21. Retract the piston fully.

MU3710

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