Lull 944E-42 Service Manual - Manual (Page 504)

Hydraulic System
8.252 Model 644E-42/944E-42 Rev. 6/04
b. Side Tilt 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 side tilt carriage cylinder (1) with a suitable
cleaner to remove dirt, debris, grease, etc.
2. If necessary, remove both grease fittings (2) from the
cylinder tube end and the rod end.
3. If necessary, press the self-aligning bearings (3)
from the cylinder tube and rod ends.
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 (4).
4. Place the side tilt carriage cylinder (1) in a soft-jawed
vise or other acceptable holding equipment if
possible.
5. Slowly remove both pilot check valves (5) from the
side tilt carriage cylinder.
6. Extend the rod (6) 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.
7. Using a pin spanner wrench, unscrew the head
gland (7) from the tube (4). The head gland was
originally torqued to 300-400 lb-ft (407-542 Nm), so
a considerable amount of force is required.
8. Carefully slide the head gland down along the rod
toward the eyelet end, away from the cylinder
tube (4).
IMPORTANT: When sliding the rod and piston assembly
in the tube, prevent the threaded end of the tube from
damaging the piston (8). Keep the rod centered within
the tube to help prevent binding.
9. Carefully pull the rod (6) with all attachments straight
out of the tube (4).
10. 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.
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WARNING:
Significant pressure may be
trapped inside the cylinder. Exercise caution
when removing a pilot-operated check valve
from a cylinder. Escaping hydraulic fluid under
pressure can penetrate the skin, causing death
or serious injury.