Lull 944E-42 Service Manual - Manual (Page 493)

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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