SkyTrak 6036 Service Manual - Manual (Page 319)

8.103 Model 6036 Legacy
Hydraulic System
9. Remove the two setscrews (Fig. 8 -66, 9) from the
piston (8). Pry or drill out the setscrews as required.
DO NOT damage the piston threads. New setscrews
will be required for reassembly.
10. Remove the piston (Fig. 8-66, 8) from the rod (4).
The piston was installed with Loctite #243 and
torqued to 200-300 lb/ft (271-407 Nm).
Note: It may be necessary to apply heat to break the
bond of the sealant between the piston (Fig. 8-66, 8)
and the rod (4) before the piston 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.
11. Remove the piston (Fig. 8-66 , 8), the rod spacer
(10) and the head gland (7) from the rod (4).
12. Remove the o-ring (Fig. 8-66 , 11), back-up ring (12),
and o-ring (13) from the head gland (7).
13. Remove the locking inserts (Fig. 8 -66 , 14) from the
holes in the head gland threads. Pry or drill out the
inserts as required. DO NOT damage the head
gland threads. New locking inserts will be required
for reassembly.
14. Remove the precision wearbands (Fig. 8-66, 15).
Remove the square ring (16), the sealed outside
diameter heavy-duty rod wiper (17) and the deep
Z-seal with rod back-up (18) from the head gland (7).
15. Remove both precision wearbands (19) and the
capped T-seal (20) 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” itself.
16. Remove the back-up rings (Fig. 8-66, 21) and the
o-ring (22) from within the piston (8).
17. If the steel bearings (Fig. 8-66 , 23) need replacement,
support the rod (4) in a soft-jawed vise or other
suitable holding device. Carefully press the bushings
from the rod.
c. Attachment Tilt Cylinder Cleaning
1. Thoroughly clean the inner surface of the attachment
tilt cylinder with trichlorethylene or another approved
cleaner.
2. Discard all seals, back-up rings and o-rings. Replace
with new items from a complete seal kit (Fig. 8-66,
24) 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. Attachment Tilt Cylinder Inspection
1. Inspect internal surfaces and all parts for wear, damage,
etc. If the inner surface of the tube (Fig. 8-66, 2) 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. Inspect all other components for wear, damage, etc.
Clean parts with trichlorethylene.
4. Check that the rod (Fig. 8 -66, 4) is straight. If it is
bent, a new rod must be installed.
e. Attachment Tilt Cylinder Assembly
Note: Follow Section 8.13.3, “General Cylinder
Assembly Instructions.”
1. Install the deep Z-seal with rod back-up
(Fig. 8 -66, 18) onto the head gland (7) orienting the
edge (26). Install the sealed outside diameter heavy-
duty rod wiper (17) into the outer end of the head gland
(7). The wiper lip (25) should be toward the outer end
of the head gland and the seal lips toward the inner
end of the head gland. Use tools that will not
damage the seals. Install the square ring (16). Install
the precision wearbands (15).
2. Install the new oiled o-ring (Fig. 8-66, 13), back-up
ring (12) and oiled o-ring (11) onto the head gland.
3. Install the new oiled o-ring (Fig. 8-66, 22) and back-
up rings (21) into the rod-end of the piston (8).