SkyTrak 6036 Service Manual - Manual (Page 326)

Hydraulic System
8.110 Model 6036 Legacy
Figure 8-72 Extend/Retract Cylinder Components
6. Attach a suitable sling to an overhead crane or other
suitable device and to the extend/retract cylinder. Make
sure the device used can actually support the cylinder.
7. Remove the two 2" external retaining rings securing
the extend/retract cylinder rod pin to the
intermediate boom section. Remove the pin.
8. Remove the two 2" external retaining rings securing
the extend/retract cylinder base pin to the outer
boom. Remove the pin.
9. Remove the extend/retract cylinder from the vehicle.
Wipe up any hydraulic fluid spillage in, on, near or
around the vehicle.
b. Extend/Retract Cylinder Disassembly
Note: An additional o-ring may be included at the base
of the cylinder rod. This additional o-ring may be discarded,
as it served only in a temporarily protective role.
1. Clean the extend/retract cylinder (Fig. 8 -72, 1) with
a suitable cleaner. Remove all dirt, debris and
grease from the cylinder.
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 tube (Fig. 8-72, 2).
2. Secure the extend/retract cylinder in a soft-jawed
vise or other acceptable holding equipment if possible.
3. Slowly remove the counterbalance valve (Fig. 8-72 , 3)
with tamper proof cap (4) and the pilot-operated check
valve (5) from the block manifold.
IMPORTANT: DO NOT tamper with or attempt to reset
the counterbalance valve cartridge. If adjustment or
replacement is necessary, replace a counterbalance
valve with a new part.
4. Extend the rod (Fig. 8-72, 6) as required to allow
access to the base of the cylinder.
IMPORTANT: Protect the finish on the rod at all times.
Damage to the surface of the rod can cause seal failure.
MA7090
1
2
3
4
5
6
7
8
9
10
11
12
18
19
20 16
17
21
Torque to
300-400 lb/ft
(407-542 Nm)
Apply Loctite
#241 to threads
and torque to
300-400 lb/ft
(407-542 Nm)
25
23
Apply Loctite #241 to
threads and torque to
155-165 lb/in (18-19 Nm)
22
24
28
27
Torque to
45-50 lb/ft
(61-68 Nm)
26
25
13
14
15
13
29
30
WARNING:
Significant pressure may be
trapped inside the cylinder. Exercise caution when
removing a counterbalance valve or a pilot-
operated check valve from a cylinder. Escaping
hydraulic fluid under pressure can penetrate
the skin, causing death or serious injury.