SkyTrak 8042 Service Manual - Manual (Page 552)

8.137 Model 8042, 10042, 10054 Legacy Rev. 10/03
Hydraulic System
b. Frame Sway 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 frame sway cylinder (2) with a suitable
cleaner. 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.
2. Secure the frame sway cylinder (2) in a soft-jawed
vise or other holding device, and place a suitable
container beneath the cylinder to catch hydraulic
fluid run-off.
3. Slowly remove the pilot-operated check valves (3)
from the frame sway cylinder.
4. Remove the locking insert (4) from its hole in the
head gland threads. Pry or drill out the insert as
required. DO NOT damage the head gland threads. A
new locking insert will be required for reassembly.
IMPORTANT: Protect the finish on the rod at all times.
Damage to the rod can cause premature seal failure.
5. Use a pin spanner wrench to unthread the head
gland (5) from the tube (6). The head gland is
installed at a torque of 300-400 lb-ft (407-542 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.
MT1900
2
3
4
5
6
3
WARNING:
Significant pressure may be
trapped inside the cylinder. Exercise caution
when removing a counterbalance valve or a pilot-
operated check valve from a cylinder. Escaping
hydraulic fluid under pressure can penetrate the
skin, causing death or serious injury.