TM 5-3805-280-24-2
Hydraulic System
REMOVE AND INSTALL PILOT PUMP
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 to release air pressure in hydraulic
oil tank.
2. Remove drain plug (E) to drain pump drive gearbox.
Approximate oil capacity is 1.0 L (1.1 qt).
3. Pull a vacuum in hydraulic oil tank using a vacuum
pump or drain hydraulic oil tank. Approximate oil
capacity is 148 L (39 gal).
4. Disconnect lines (B, F and G).
5. Remove cap screws (D) to remove pilot pump (F).
6. Replace parts as necessary. (See Disassemble and
Assemble Pilot Pump in this group.)
7. Apply plastic gasket to mounting surface for pilot
A--Filler Pipe
pump.
B--Pilot Pump Inlet-to-Hydraulic Oil Tank Line
C--Dipstick
D--Cap Screw, Washer and Lock Washer (2 used)
8. Tighten cap screw.
E--Drain Plug
F--Pilot Pump Outlet-to-Hydraulic Pump Line
Pump-to-Drive Gearbox Cap Screw--Specification
G--Pilot Pump Outlet-to-Pilot Filter Line
H--Pilot Pump
Torque ............................................................................. 49 Nm (36 lb-ft)
9. Connect lines.
10. Fill pump drive gearbox with oil through filler pipe (A)
so level is above "H" mark on dipstick (C). (See
Diesel Engine and Pump Gearbox Oils in Group
0004.)
33
3360
53
TX,33,UU3786
1921SEP981/1
21-91