TM 10-3930-641-20
(Sheet 1 of 2)
HYDRAULIC SYSTEM DESCRIPTION
High pressure mast hydraulic system consists of:
Hydraulic tank
1.
Hydraulic pump
2.
Control valve
3.
Lift cylinder
4.
Tilt cylinders
5.
Side shift cylinder
6.
Side tilt cylinder
7.
Container lock cylinders
8.
Oil flows from hydraulic tank (1) to hydratdic pump (2) then to con-
trol valve (3). The control levers are moved to let oil go through the
control valve to lift cylinder (4), tilt cylinders (5), side shift cylinder
(6), side tilt cylinder (7) or container lock cylinders (8). Oil returns
from the cylinders through the control valve and back to the tank.
HYDRAULIC TANK. The storage reservoir for all of the
Contains an oil pressure relief valve to return extra oil pressure
hydraulic oil used in the machine except for the transmission
back to the hydrau!ic tank when the mast is fully tilted, fully
and torque converter. Equipped with an inlet strainer for filter-
raised, fully shifted or fully rotated.
ing oil when added. A filter is built into the tank for filtering oil
returning from the hydraulic system.
LIFT CYLINDER. A ram-type cylinder which moves up by
4.
hydraulic oil pressure and moves down by gravity. The extended
HYDRAULIC PUMP. A gear-type, driven by the engine. Sup-
2.
part of the cylinder is completely filled with oil.
plies oil to the control valve for distribution to the hydraulic
system.
TILT CYLINDERS (2). Double acting cylinders which extend
5.
by hydraulic pressure and retract by hydraulic pressure. Control
CONTROL VALVE. Directs high pressure oil to hydraulic
3.
the forward-backward tilt angle of the mast.
cylinders, depending on the position of hydraulic control lever.
TA 098567
Go on to Sheet 2
1-26
