TM 5-3805-280-24-2
Hydraulic System
IMPORTANT: The orifice size in the plungers (24
Tighten spool assembly bottom plug (4).
and 25) are a different size. Plungers
3/8 in. Plug for Plunger-to-Housing--Specification
with the correct size orifice must be
install into the same bore from
Torque....................................................................... 49 Nm (36 lb-ft)
which they were removed for proper
operation.
2. Check seats in housing for check valve balls (18).
Tighten plug (8).
1. Check that plungers (24 and 25) slide smoothly in
bore. Check that orifice in plungers are clean.
Check Valve-to-Housing Plug--Specification
Orifice size for plunger (25) in the arm in circuit is
Torque...................................................................... 10 Nm (86 lb-in.)
3.2 mm (0.126 in.). Orifice size for plunger (24) in
the boom up circuit is 2.5 mm (0.098 in.).
3. Check that orifice (11) is clean. Tighten orifice.
Arm In Plunger Orifice--Specification
Orifice-to-Housing--Specification
Size ........................................................................ 3.2 mm (0.126 in.)
Torque...................................................................... 10 Nm (86 lb-in.)
Boom Up Plunger Orifice--Specification
Size ........................................................................ 2.5 mm (0.098 in.)
TX,33,UU3799
1921SEP982/2
REMOVE AND INSTALL CONTROL VALVE
CAUTION: The hydraulic oil tank is pressurized.
High pressure release of oil from pressurized
system can cause serious burns or penetrating
injury. Release pressure from tank by loosening
vent plug. It is not necessary to remove vent
plug.
1. Loosen vent plug (A) to release air pressure from
hydraulic oil tank.
2. Pull a vacuum in hydraulic oil tank using a vacuum
A--Vent Plug
pump or drain hydraulic oil tank. Approximate oil
33
capacity is 130 L (35 gal).
3360
84
Continued on next page
TX,33,UU4002
1921SEP981/8
21-120
