SkyTrak 8042 Service Manual User Manual
Page 529
Hydraulic System
8.114
Model 8042, 10042, 10054 Legacy
Rev. 10/03
4. Install both precision wearbands (17) and the
capped T-seal (18) onto the piston (8).
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.
5. Install the head gland (7) and piston (8) onto the rod
(4).
IMPORTANT: Protect the finish on the rod at all times.
Damage to the surface of the rod can cause seal failure.
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. Apply
Loctite #271 (red) and install the locknut (9) onto the
rod (4). Torque the nut to 1850-2000 lb-ft (2508-2712
Nm). The threads will deform upon tightening,
locking the nut in place.
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.
7. Place the attachment tilt cylinder tube (2) in a soft-
jawed vise or other acceptable holding equipment if
possible.
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.
8. Carefully insert the rod (4) with all attachments
straight into the tube (2).
9. Using a pin spanner wrench, thread the head gland
(7) almost completely into the tube (2), leaving just
enough room to install a new locking insert (13) into
its hole in the head gland threads.
10. Install a new locking insert (13). Thread the head
gland (7) tightly into the tube and torque to 500-600
lb-ft (678-813 Nm).
11. Using new oiled o-rings, thread the 4000 psi (276 bar)
counterbalance valve (5) and the pilot-operated
check valve (6) into the attachment tilt cylinder.
Torque to 30-35 lb-ft (41-47 Nm).
12. If necessary, install a grease fitting (3) into the
tapped hole in the end of the rod (4). Lubricate the
bushings (20) in the rod end through the grease
fitting with multi-purpose grease before the vehicle is
operated.
MH2860
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