Fisher HT Series - Hydraulic Component Installation Procedures; Ram Seal Installation Guide; Cartridge and Check Valve Removal

Lit. No. 41298, Rev. 01 February 15, 2019
17
Excerpts taken from UltraMount
®
2 Owner's Manual (Lit. No. 43181, Rev. 01).
HYDRAULIC COMPONENT INSTALLATION
SYSTEM OVERVIEW – HYDRAULIC
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.
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.
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.
Seal Position
Gland
Back-Up Ring
Wiper
Seal O-Ring
Wear Ring
Inner
Backing
Ring
Outer
Seal
Wear
Ring
Nut
Groove in Rod
Rod
Gland
Piston
Cylinder
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
for removing hydraulic components without
completely draining reservoir.
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.
Cartridge & Check Valve Removal