Hydraulic Component Installations - Western HTS Mechanic's Manual

SYSTEM OVERVIEW – HYDRAULIC
HYDRAULIC COMPONENT INSTALLATION
Ram Seal Installation
1. Lubricate O-rings before
assembly.
2. Assemble gland components as
shown, then lubricate.
3. Remove piston from rod and
assemble piston components as
shown.
Nut
Groove in Rod
Rod
Piston
Gland
Cylinder
O-Ring
Seal
Back-Up Ring
Wear Ring
Wiper
Gland
Seal Position
Lit. No. 41467, Rev. 01
4. Assemble gland to threaded end
of rod. Do not slide gland over
cross hole in rod.
5. Reassemble piston to rod and
tighten nut to 100–120 ft-lb.
6. Assemble O-ring into groove on
rod. Use tape or other protection
on threads.
7. Apply bead of medium-strength
threadlocker all around threads
of gland.
8. Lubricate piston seals and inside
of cylinder.
9. Press rod assembly into cylinder
and tighten gland to 30–40 ft-lb.
Wear
Ring
Cartridge & Check Valve Removal
It is possible to remove cartridges
and check valves from a hydraulic
unit without draining the hydraulic
fl uid from the reservoir.
1. Install the Diagnostic Harness
(PN 29290-2) following the
instructions included with the kit.
2. Cycle through the control
functions twice to remove the
pressure in the hydraulic unit.
3. Slowly remove the breather from
the top of the hydraulic unit.
4. Either (a) completely drain
reservoir and skip to Step 9 or
(b) proceed with instructions on
removing hydraulic components
without completely draining
reservoir.
Outer
Seal
Inner
Backing
Ring
5. Install a 3/8" barb fi tting into the
top of the reservoir tank.
6. Attach a hand-operated vacuum
pump to the barb fi tting.
7. Using the vacuum pump, pull a
vacuum of approximately
5"–10" Hg.
8. You should now be able to
remove cartridges and check
valves from the hydraulic unit
with minimal fl uid loss. Maintain
the vacuum until the replacement
cartridge/check valve has been
installed. Once the replacement
part has been installed, release
the vacuum and remove the
3/8" barb fi tting.
9. Reinstall the breather and
remove the 29290-2 diagnostic
harness according to the
instructions included with the kit.
April 15, 2021
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