Section III. HYDRAULIC SYSTEM SERVICE
HYDRAULIC SYSTEM SERVICE
SUPPLIES: Oil as recommended (Refer to LO 5-3810-306-12)
EQUIPMENT CONDITIONS: None
1. SERVICE HYDRAULIC SYSTEM.
c. Drain transmission/ converter lubricant from
transmission drain plug.
If presence of
The transmission, torque converter,-and its allied
considerable foreign material is noted, it will be
hydraulic system are important links in drive line between
necessary that transmission be removed,
engine and wheels. The proper operation of either unit
disassembled, and cleaned thoroughly.
depends greatly on condition and operation of other;
therefore, whenever repair or overhaul of one unit is
d. Assemble all components and use only type oil
performed, the balance of system must be considered
before job can be considered completed.
through the fill pipe until fluid is at the top of the
fill pipe. Run the engine two minutes at 500 to
a. Replace oil filter elements, cleaning out filter
600 rpm to prime the torque converter and
hydraulic lines. Recheck the level of oil in the
transmission with the engine running at idle (500
b. The oil cooler must be thoroughly cleaned. The
to 600 rpm). Add oil as necessary to bring the
cooler should be back flushed with oil and
level above the ADD mark on the dipstick. After
compressed air until all foreign material has
the oil temperature reaches 180 to 200 degrees
been removed. Flushing in direction of normal
F (82.2 to 93.3 degrees C), add oil to bring the
oil flow will not adequately clean cooler. If
level to the FULL mark on the dipstick.
necessary, cooler assembly should be removed
for cleaning, using oil, compressed air and a
steam cleaner for that purpose.
Do not use flushing compounds for
END OF TASK