SkyTrak 8042 Service Manual - Manual (Page 545)

Hydraulic System
8.130 Model 8042, 10042, 10054 Legacy Rev. 10/03
12. Remove the small o-ring (11) from within the piston
(7).
13. Remove the o-ring (12) and back-up ring (13) from
the head gland (6). Slide the rings off the rod (4) to
remove them from the rod.
14. Remove the precision wearbands (14) from within
the head gland (6). Remove the sealed, outside
diameter heavy-duty rod wiper (17) and the deep Z-
seal with back-up (15) from the other end of the
head gland. Remove the rod spacer (16).
c. Lift/Lower Cylinder Cleaning
1. Remove all hydraulic fluid, dirt and debris from the
inner surface of the cylinder tube (1).
2. Discard all seals, back-up rings, o-rings, etc.
Replace with new items from complete seal kits (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.
Note: If a white, powdery residue is present on threads
and parts, it can be removed. Clean the residue away
with a soft brass wire brush prior to reassembly, and
wipe with Loctite “T” cleaner before reinstallation.
d. Lift/Lower Cylinder Inspection
1. Inspect internal surfaces and all parts for wear,
damage, etc. If inner surface of the tube (1) does not
display a smooth finish, or is scored or damaged in
any way, replace the tube. Often, dirty hydraulic fluid
causes failure of internal seals and damage to the
smooth surface within the tube.
2. Remove slight scratches on the piston, rod or inner
surface of the tube with very fine grit emery cloth.
Use the emery cloth in a rotary motion to polish out
and blend the scratch(es) into the surrounding
surface.
3. Clean parts with trichlorethylene.
4. Check that the rod (4) is straight. If it is bent, install a
new rod.
MH2890
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