SkyTrak 8042 Service Manual - Manual (Page 573)

Hydraulic System
8.158 Model 8042, 10042, 10054 Legacy Rev. 10/03
8. Install the capped T-seal (1) and precision
wearbands (2) onto the piston (3).
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. Install new oiled o-ring (4), back-up ring (5) and oiled
o-ring (6) onto the head gland (7).
IMPORTANT: When sliding the rod and piston assembly
in the tube, prevent the threaded end of the tube from
damaging the piston (3). Keep the rod centered within
the tube to help prevent binding. Protect the finish on the
rod at all times. Damage to the surface of the rod can
cause seal failure.
10. Carefully insert the rod (8) with all attachments
straight into the tube (9).
11. Apply Loctite #242 (blue) to the threads of the head
gland (7). Using a pin spanner wrench, thread the
head gland (7) into the tube (9). Torque the head
gland to 300 ±50 lb-ft (407 ±68 Nm).
12. Apply Loctite #242 (blue) to the threads of the lock
screw (10) and thread into the flange of the head
gland (7). Torque to 3-4 lb-ft (4-5 Nm).
IMPORTANT: DO NOT tamper with or attempt to reset
the counterbalance valve (11). If adjustment or
replacement is necessary, replace a counterbalance
valve with a new part.
13. Lubricate the counterbalance valve (11) and the
pilot-operated check valve (12) with clean, filtered
hydraulic oil. Using new oiled o-rings, thread the
valves into the tube (9). Torque to 30-35 lb-ft
(41-47 Nm).
MH4320
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