SkyTrak 8042 Service Manual User Manual
Page 553
Hydraulic System
8.138
Model 8042, 10042, 10054 Legacy
Rev. 10/03
IMPORTANT: When sliding the rod and piston assembly
out of the tube, DO NOT damage the piston by scraping
it against the threads in the tube. Keep the rod in line
with the tube to prevent binding.
6. Carefully withdraw the rod (6) straight out of the tube
(5). Keep the rod straight during withdrawal to help
avoid scratching, nicking or damaging the tube.
7. Secure the rod eyelet and remove the locknut (7) from
the threaded end of the rod. Discard the nut; a new
nut will be required for reassembly.
Note: Heating the nut (7) to approximately 300° F
(150° C) may also be required to break the seal formed
by the Loctite Threadlocker #271 (red) applied to the nut
when installed. The application of significant force is
required to overcome the 1100-1250 lb-ft (1492-1695
Nm) of torque the nut was tightened to when originally
installed.
8. Remove the piston (8) from the rod (6).
9. Remove the small o-ring (9) from the piston (8).
10. Remove the head gland (4) from the rod (6).
11. Remove both precision wearbands (10) from the
piston (8).
12. Remove the capped T-seal (11) from 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” seal band.
13. Remove the o-ring (12), the back-up ring (13) and
the o-ring (14) from the head gland (4).
14. Remove the heavy-duty rod wiper (15) from the head
gland (4).
15. Remove the precision wearband (16) and deep
Z-seal with rod back-up (17) from inside the head
gland (4).
c. Frame Sway Cylinder Internal Cleaning
1. Remove all hydraulic fluid, dirt and debris from the
inner surface of the cylinder.
2. Discard all seals, back-up rings and o-rings. Replace
with new items from a complete seal kit (18) to help
ensure proper cylinder function.
3. Clean all metal parts with an approved cleaning
solvent such as trichlorethylene. Carefully clean
cavities, grooves, threads, etc.
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