SkyTrak 6042 Service Manual - Manual (Page 342)

Hydraulic System
8.110 Model 6042 Legacy Origin 7/02
Figure 8-73 Extend/Retract Cylinder Components
e. Extend/Retract Cylinder Assembly
Note: Follow Section 8.13.3, “General Cylinder
Assembly Instructions.”
1. Install a new back-up ring (16), oiled o-ring (17) and
another back-up ring (16) into the piston (8).
2. Install the square ring (Fig. 8-73, 15), the piston
seal (14) and both precision wearbands (13) onto
the piston (8).
3. Install the precision wearbands (Fig. 8-73, 21) and
the buffer seal (29) into the front end of the head
gland (7). Orient the buffer seal as shown (30). At
the rear of the head gland, install the U-cup seal (24)
orienting the edge (27). Install the sealed outside
diameter heavy-duty rod wiper (23). The wiper
lip (28) 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 (22).
4. Install a new oiled o-ring (Fig. 8-73, 20), back-up
ring (19) and oiled o-ring (18) onto the head gland (7).
IMPORTANT: Avoid using excess force when clamping
the cylinder in a vise. Apply only enough force to hold the
cylinder securely. Excessive force can damage the
cylinder.
5. 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.
6. Carefully slide the head gland (Fig. 8-73, 7), then
the rod spacer (12) onto the rod (6).
7. Carefully slide the piston (Fig. 8 -73, 8) onto the
rod spacer (12) and rod (6). Apply Loctite
Threadlocker #271 to the piston and torque the
piston to 330-390 lb-ft (448-529 Nm).
8. Apply Loctite Threadlocker #243 to the setscrews
(Fig. 8-73, 10 and 11).
9. Thread the first setscrew (11) into the piston (8) and
torque to 10-26 lb-ft (14-35 Nm).
10. Thread the second setscrew (10) into the piston (8)
abd torque to 10-12 lb-ft (14-16 Nm).
11. Install new locking inserts (Fig. 8-73, 9) into the
holes in the head gland threads.
IMPORTANT: Avoid using excess force when clamping
the cylinder in a vise. Apply only enough force to hold the
cylinder securely. Excessive force can damage the
cylinder.
12. Secure the extend/retract cylinder in a soft-jawed
vise or other acceptable holding equipment if
possible.
1
2
3
4
5
6
7
8
9
10
11
12
18
19
16
17
20
Torque to
300-400 lb-ft
(407-542 Nm)
Apply Loctite
#271 to threads
and torque to
330-390 lb-ft
(448-529 Nm)
24
22
Apply Loctite #243 to
threads and torque to
10-12 lb-ft (14-16 Nm)
21
23
28
27
Torque to
40-50 lb-ft
(54-68 Nm)
26
25
14
15
13
29
30
Apply Loctite #243 to
threads and torque to
10-26 lb-ft (14-35 Nm)
13
16