SkyTrak 8042 Service Manual - Manual (Page 531)

Hydraulic System
8.116 Model 8042, 10042, 10054 Legacy Rev. 10/03
9. Carefully pull the rod (1) along with the head gland
(2) and all attachments straight out of the tube (3).
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.
11. Remove the two setscrews (4) from the locknut (5).
Under each setscrew is a nylon ball (6). Be sure to
remove the nylon balls from the locknut. Discard the
nylon balls.
12. Remove the locknut (5) from the rod (1). The locknut
is torqued at 1735-1885 lb-ft (2352-2556 Nm).
Note: It may be necessary to apply heat to break the
bond of the sealant between the locknut (5) and the rod
(1) before the piston (7) can be removed. Some parts of
cylinders are sealed with a special organic sealant and
locking compound.
Before attempting to disassemble these parts, remove
any accessible seals from the area of the bonded joint.
Wipe off any hydraulic oil and heat the joint uniformly to
break the bond. A temperature of 300-400° F (149-204° C)
will destroy the bond. Avoid overheating or the parts may
become distorted or damaged. Apply sufficient torque or
pressure for removal while the parts are still hot.
Breakdown of sealant will leave a white, powdery
residue on threads and parts. Clean the residue away
with a soft brass wire brush prior to reassembly, and
wipe with Loctite “T” cleaner before reinstallation.
13. Remove the piston (7) and head gland (2) from the
rod (1).
14. Remove the o-ring (8), back-up ring (9), and o-ring
(10) from the head gland (2).
15. Remove the precision wearbands (11), the deep Z-
seal with rod back-up (12) and the sealed outside
diameter heavy-duty rod wiper (13) from the head
gland (2).
16. Remove the precision wearband (14) and the
capped T-seal (15) from the piston (7).
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.
17. Remove the small o-ring (16) from the groove in the
end of the rod (1).
18. If the bushings (17) need replacement, support the
rod (1) in a soft-jawed vise or other suitable holding
device. Carefully press the bushings from the rod.
MH4290
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