Lull 944E-42 Service Manual User Manual download pdf (Page 495)

100

101

8.243

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

Hydraulic System

11. Secure the rod eyelet in a soft-jawed vise or other

suitable holding device. Place a padded support

below the threaded end of the rod to help prevent

damaging the rod.

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

(red) to a new locknut (11) in accordance with Loctite

instructions. Install the nut onto the threaded end of

the rod. Torque the nut to 500-550 lb-ft

(678-746 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 (2).

13. Fasten the tube (2) in a soft-jawed vise or other

suitable holding device.

14. Lubricate the o-rings and the inside of the tube,

piston and head gland with clean, filtered hydraulic

oil. This will aid in installation.

IMPORTANT: Use a suitable installation tool or

compression sleeve to help prevent twisting or damaging

the seals and o-rings when installing the piston (5) 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.

15. Keep the rod (3) straight and carefully insert the rod

into the tube (2). Avoid scratching, nicking or

damaging the tube while installing the rod.

16. Begin threading the head gland (4) into the tube (2).

Place the locking inserts (8) into the holes in the

head gland threads just before the holes are

threaded into the tube. Use a suitable pin spanner

wrench to thread the head gland (4) completely into

the tube (2). Torque the head gland to 250-300 lb-ft

(339-407 Nm).

17. 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.

18. Increase the operating pressure to the maximum for

the cylinder (3500 psi or 241 bar) and check for

external leakage and for free movement in both

directions.

19. Retract the piston fully.

MU3800

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