P O W E R T R A IN
T R A N S M I S S I O N H Y D R A U L I C S Y S T E M
S Y S T E M S O P E R A T I O N
Pressure oil, from the oil pump, goes in filter base
(6) through inlet passage (4). The oil goes through
the filter base to housing (8). Oil fills the space
between the inside of housing (8) and filter element
(7). Normally, oil goes through the filter element and
then to the outlet passage. The oil then goes to the
remainder of the hydraulic system. The filter ele-
ment stops any debris that is in the oil.
If the filter element becomes full of debris, the
restriction to the flow of oil causes a pressure increase
inside the filter. The increase in pressure causes by-
pass valve (1) to open. The oil then goes to the
hydraulic system. When the oil does not go through
the filter element, it is dirty and the debris in the oil
can cause damage to other components in the hy-
Correct maintenance must be used to make certain
that filter element (7) does not become full of debris
LOCATION OF OIL FILTER
and stop the flow of clean oil to the hydraulic system.
A magnetic screen is inside of the transfer gear
case. Oil from the bottom of the transfer gear case
goes through an inlet passage. As the oil goes through
the screen, foreign particles that are in the oil are
stopped by the screen and can not go into the trans-
mission hydraulic system.
After the oil goes through the screen, it goes
around and through magnets. The magnets are in-
stalled on the tube assembly so that the same magne-
tic ends are next to each other. Smaller metal parti-
cles that go through the screen are stopped and held
by the magnets. These magnets will not let the metal
particles go with the oil through the hydraulic
The oil then goes through the outlet passage to the
COMPONENTS OF THE OIL FILTER
1. Bypass valve. 2. Spring. 3. Plug, 4. Inlet passege. 5.
Outlet pemege. 6. Base. 7. Etement. 8. Housing.
LOCATION OF MAGNETIC SCREEN