SkyTrak 6036 Service Manual - Manual (Page 216)

Section 9 Hydraulic System
9-66 Model 6036/6036T S/N 9B0500 thru 14833
7. Remove piston seal (3) and wear ring (2) from
the piston (4).
NOTE: It may be necessary to apply heat to break
the bond of the sealant between piston (4) and rod
(10) before the piston can be removed. Refer to
paragraph 9.5.a.
8. Remove piston (4) and the gland (7) from the
rod.
9. Remove O-ring (5), backup ring (6), wiper (9)
and rod seal (8) from the gland.
c. Cleaning
1. Discard all seals and backup rings. Replace
with a complete new seal kit.
2. Clean all metal parts in an approved cleaning
solvent such as trichlorethylene. Be sure to
carefully clean all cavities and grooves.
d. Inspection, Repair and Replacement
1. Check that rod (10, Fig. 9.36) is straight. If the
rod is bent, install new rod.
2. Inspect the inside of tube (1) for scoring and
other damage. If there is any damage to the
tube, replace with new tube.
3. Remove small scratches on the piston rod or
inside of the tube with emery cloth of very fine
grit. Use the emery cloth with a rotary motion.
e. Assembly
NOTE: Follow general assembly instructions in
paragraph 9.5.c.
1. Install new O-ring (5), backup ring (6), wiper
(9), and rod seal (8) on gland (7) as shown in
Fig. 9.36.
2. Fasten the rod eye in a soft-jawed vise or
other acceptable holding device. Put a
padded support below and near the end of the
rod to prevent damage to the rod.
3. Push the assembled gland onto the rod (10).
If necessary, use a soft hammer to drive the
gland onto the rod.
4. Apply Loctite ® Primer T and Threadlocker 271
to the piston (4) in accordance with the
manufacturer’s instructions. Install the piston
on the rod and torque to 250 lb-ft (339 Nm).
5. Install new piston seal (3) and wear ring (2) on
the piston.
6. Fasten the cylinder tube (1) in a soft-jawed
vise or other acceptable holding equipment.
Be careful not to damage the tube.
7. Lubricate the inside of the tube, piston, and
gland O-ring (5) with clean hydraulic oil.
8. Apply a compression sleeve or other suitable
tool to the gland in order to compress the O-
ring (5) on the gland. Insert the assembled
piston, rod and the gland into the tube (1).
Using a pin spanner wrench, thread the gland
into the tube. Remove the compression tool
IMPORTANT: When sliding the rod and piston
assembly into the tube, be careful so that gland
threads in the tube do not damage the piston seal.
Keep the rod in line with the tube barrel to prevent
binding.
9. Install new O-rings and backup rings on
counterbalance and relief valves (11 and 12).
Use a new valve if the valve was removed for
replacement. Lubricate outside of the valves
with clean filtered hydraulic oil. Install the
valves and torque to 30 to 35 lb-ft (40,7 to
47,5 Nm).
10. Install the orifice (13) into the valve block.
11. Following reassembly, test the cylinder at low
operating pressure (100 psi or 6,9 bar) to be
sure the piston and rod are moving freely in
both directions.
12. Increase the operating pressure to the maxi-
mum (4000 psi or 275 bar) for the cylinder and
check for external leakage and free movement
in both directions.
13. Prepare the cylinder for installation by retract-
ing the piston and capping and plugging the
ports.
5. Pull rod (10) and attached parts straight out of
the tube.
IMPORTANT: When sliding the rod and piston
assembly from the tube, be careful so that gland
threads in the tube do not damage the piston.
Keep the rod in line with the tube barrel to prevent
binding.
6. Fasten the eye end of the rod (10) in a soft-
jawed vise and put a support below the rod
near the piston to prevent damage to the rod.