SkyTrak 3606 Service Manual - Manual (Page 304)

Section 9
9-110
5. Using a pin spanner wrench, unscrew the gland (8)
from the cylinder tube (2). Slide the gland down along
the rod toward the eyelet, away from the tube (2).
IMPORTANT: Protect the finish on the rod at all times.
Damage to the surface of the rod can cause seal failure.
6. Carefully pull the rod (11) with all attachments
straight out of the tube (2).
IMPORTANT: When sliding the rod and piston assembly
in the tube, prevent the threaded end of the tube from
damaging the piston (5). Keep the rod centered within the
tube to help prevent binding.
7. Fasten the eye 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 piston (5) and gland (8) from rod (11).
Note: Loctite Threadlocker #271 (red) and 250 lb/ft (339
Nm) were applied to the piston when it was installed. It
may be necessary to apply heat to break the bond of the
sealant between the piston (5) and the rod (11) before
the piston can be unthreaded and 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° to 400° F (149° to 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 seal (4) and wear ring (3) from the
piston (5).
10. Remove the O-ring (6), backup ring (7), wiper (10)
and rod seal (9) from the gland (8).
c. Swing Carriage Cylinder Cleaning
1. Remove all hydraulic fluid, dirt and debris from the
swing carriage cylinder (1, Fig. 9– 72).
2. Discard all seals, backup rings and O-rings. Replace
with new items from a complete seal kit 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.
4. 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. Swing Carriage Cylinder Inspection
1. Inspect internal surfaces and all parts for wear,
damage, etc. If inner surface of the tube (2,
Fig. 9– 72) does not display a smooth finish, or is
scored or damaged in any way, replace the tube.
Most often, dirty hydraulic fluid causes failure of
internal seals and damage to the smooth surface
within the tube. 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.
2. Remove any burrs with a fine file. Clean parts with
trichlorethylene after repair.
3. Check that the rod (11) is straight. If it is bent, install
a new rod.
e. Swing Carriage Cylinder Assembly
Note: Follow the information in Section 9.12 c. General
Cylinder Assembly.
1. Install a new rod seal (9), wiper (10), backup ring (7)
and O-ring (6) onto the gland (8). Orient the rod seal
(9) and wiper (10) as shown in Fig. 9– 72.
2. Fasten the eye 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.
3. Push the gland (8) onto the rod (11). If necessary,
use a soft hammer to drive the gland onto the rod.
4. Install a new piston seal (4) and wear ring (3) onto
the piston (5).
5. Apply Loctite Primer “T” and Threadlocker #271 (red)
to the threads of the piston (5) in accordance with
Loctite instructions. Thread the piston onto the rod
(11) and torque to 250 lb/ft (339 Nm).
6. Place the cylinder tube (2) in a soft-jawed vise or
other acceptable holding equipment if possible. DO
NOT damage the tube.
7. Lubricate the piston (5), gland and the inside of the
tube (2) with clean, filtered hydraulic oil.
8. Apply a compression sleeve or other suitable tool to
the gland in order to compress the O-ring (6).
Carefully insert the rod (11) with all attachments
straight into the tube (2). Use a pin spanner wrench
to thread the gland into the tube. Remove the
compression tool.
IMPORTANT: When sliding the rod and piston assembly
in the tube, prevent the threaded end of the tube from
damaging the piston (5). Keep the rod centered within the
tube to help prevent binding.
Model 3606 • Origin 10/99