SkyTrak 3606 Service Manual - Manual (Page 286)

Section 9
9-92
9. Remove the capped T-seal (4) from the piston (5).
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.
c. Slave Cylinder Cleaning
1. Remove all hydraulic fluid, dirt and debris from the
inner surface of the cylinder.
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.
Note: 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.
4. Remove the 1.125-12 NF lock nut (3, Fig. 9– 65) from
the rod (15). The deforming-thread type nut was
coated with Loctite #271 (red) and torqued to 445-
515 lb/ft (603-698 Nm). Discard the nut.
Note: It may be necessary to apply heat to break the
bond of the sealant between the 1.125-12 NF lock nut (3)
and the rod (15) before the piston (5) can be removed.
Some parts of cylinders are sealed with a special organic
sealant and locking compound. Before attempting to dis-
assemble 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 temper-
ature of 300° to 400° F (149° to 204° C) will destroy the
bond. Avoid overheating or the parts may become dis-
torted or damaged. Apply sufficient torque or pressure for
removal while the parts are still hot. Breakdown of seal-
ant 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.
5. Remove the piston (5) and head gland (10) from the
rod (15).
6. From within the head gland (10), remove the
precision wearband (7), the deep Z-seal with backup
(8), and the sealed outside diameter heavy-duty rod
wiper (11).
7. From within the piston (5), remove the precision
wearband (7) and the small O-ring (8).
d. Slave Cylinder Inspection
1. Inspect internal surfaces and all parts for wear,
damage, etc. If inner surface of the tube (2, Fig. 9–
65) 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. Clean parts with trichlorethylene.
3. Check that the rod (15) is straight. If it is bent, install
a new rod.
e. Slave Cylinder Assembly
Note: Follow Section 9.10 c. General Cylinder Assembly
Instructions.
IMPORTANT: Use a suitable installation tool or com-
pression sleeve to help prevent twisting or damaging the
seals and O-rings when installing the piston and head
gland into the cylinder. When sliding the rod and piston
assembly in the tube, DO NOT damage the piston by
scraping it against the threads in the tube. Keep the rod
in line with the tube to prevent binding.
1. 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.
2. Within the piston (5), install the small O-ring (6, Fig.
9– 65) and the precision wearband (7).
3. From within the head gland (10), install the sealed
outside diameter heavy-duty rod wiper (11), the deep
Z-seal with backup (8), and the precision wearband
(7).
4. Carefully install the piston (5) and head gland (10)
onto the rod (15).
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.
Note: If a white, powdery residue remains on the
threads and parts, clean the residue away with a soft
brass wire brush prior to reassembly, and wipe with
Loctite “T” cleaner before proceeding.
5. Apply Loctite Threadlocker #271 (red) to the 1.125-
12 NF lock nut (3). Thread the lock nut onto the rod
(15) and torque to 445-515 lb/ft (603-698 Nm). The
threads will deform upon tightening, locking the nut in
place.
Model 3606 • Origin 10/99