Lull 944E-42 Service Manual User Manual download pdf (Page 493)

100

101

8.241

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

Hydraulic System

b. Transfer Carriage Cylinder Disassembly

Note: An additional o-ring may be included at the base

of the cylinder rod. This additional o-ring may be

discarded, as it served only in a temporarily protective

role.

1. Clean the transfer carriage cylinder (2) with a

suitable cleaner before inspection. Remove all dirt,

debris and grease from the cylinder.

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 (3).

2. Place the transfer carriage cylinder in a soft-jawed

vise or other acceptable holding equipment if

possible.

3. Extend the rod (4) to allow access to the base of the

cylinder.

IMPORTANT: Protect the finish on the rod at all times.

Damage to the surface of the rod can cause seal failure.

4. Using a pin spanner wrench, unscrew the head

gland (5) from the tube (3). The head gland was

originally torqued at 250-300 lb-ft (339-407 Nm), so

a considerable amount of force is required to remove

it. Carefully slide the head gland down along the rod

toward the eyelet end, away from the cylinder

tube (3).

IMPORTANT: When sliding the rod and piston assembly

in the tube, prevent the threaded end of the tube from

damaging the piston (6). Keep the rod centered within

the tube to help prevent binding.

5. Carefully pull the rod (4) with all attachments straight

out of the tube (3).

6. Fasten the rod end in a soft-jawed vise and put a

padded support below and near the threaded end of

the rod to help prevent damage to the rod.

7. Remove the o-ring (7), back-up ring (8) and locking

inserts (9) from the head gland.

8. Remove the precision wearband (10) and the

capped T-seal (11) from the piston (6).

Note: The T-seal actually consists of four components; a

wide, flexible inner band, the flexible T-seal band itself,

and two supportive split caps that mount on either side of

the “T” itself.

9. Remove the locknut (12) from the rod (4). The

deforming-thread type nut was coated with Loctite

#271 (red) and torqued to 500-550 lb-ft

(678-746 Nm). Discard the nut.

MU3800

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