SkyTrak 6042 Service Manual - Manual (Page 345)

8.113 Model 6042 Legacy Origin 7/02
Hydraulic System
Figure 8-75 Lift/Lower Cylinder Components
IMPORTANT: When sliding the rod and piston assembly
into the tube, prevent the threaded end of the tube from
damaging the piston (Fig. 8-75, 8). Keep the rod
centered within the tube to help prevent binding.
6. Carefully pull the rod (Fig. 8-75, 5) with all
attachments straight out of the tube (2).
7. Fasten the rear of the rod 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.
8. Remove the locknut (Fig. 8-75, 9) from the rod (5).
The nut was installed with Loctite #271 (red) and
torqued to 1,750-2,000 lb-ft (2.373-2.712 Nm).
Note: It may be necessary to apply heat to break the
bond of the sealant between the locknut (Fig. 8-75, 9)
and the rod (5) before the piston (8) 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.
9. Remove the piston (Fig. 8-75, 8) from the rod (5).
10. Remove both precision wearbands (Fig. 8-75, 10)
and 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” itself.
MA7071
8
6
11
9
13
12
20
17
18
1
5
21
2
4
3
14
15
16
7
10
Torque to
30-35 lb-ft
(41-47 Nm)
Torque to
300-400 lb-ft
(407-542 Nm)
Apply Loctite #271 to
Threads and Torque
to 1,750-2,000 lb-ft
(2.373-2.712 Nm)
19