LIFT CYLINDER HOLDING VALVE INSTALLATION
EQUIPMENT CONDITIONS: Hydraulic system shutdown and pressure relieved from
lines (Refer to TM 5-3810-306-20.)
Boom fully lowered. (Refer to TM 5-3810-306-10.)
Negative battery cable disconnected at shunt. (Refer to
1. INSTALL NEW EXTERNAL PACKINGS (3), (4) AND
1. REMOVE LIFT CYLINDER HOLDING VALVE (1)
(5) AND BACK-UP RINGS (6) AND (7) ONTO
FROM LIFT CYLINDER (2).
a. Tag and remove hydraulic line (8) from plug (9).
b. Remove plug (9) and packing (10) from holding
Do not damage the packings during
valve (1). Discard packing (10).
installation of the holding valve. If
the holding valve turns freely then
Remove lift cylinder holding valve (1).
gets hard to turn, then easy to turn;
remove the holding valve and check
d. Remove and discard packings (3), (4) and (5)
the packings. They have probably
and back-up rings (6) and (7).
been damaged by a sharp edge of a
No repair or replacement of valve
components is recommended with
The holding valve should turn by
the exception of outer seals.
hand until compression of the
2. INSTALL LIFT CYLINDER HOLDING VALVE (1) ON
LIFT CYLINDER (2).
Prior to installing packings and back-up ring, coat
a. Check inside of lift cylinder (2) port block for any
components with clean hydraulic oil and threads
sharp edges or burrs and remove as necessary
with Loctite #545.
with emery cloth.
b. Install lift cylinder holding valve (1) on lift