PS
M6.0
6000
001
OE35
Version no
T-code
F-code
Section
C-code
Hydraulic System
244
Service Manual
1997-10-23
inside the transmission to release the brakes. A pressure
relief valve holds the oil pressure at 180 psi.
When the pump motor is turned off the solenoid is de-
energized and opens back up. This allows oil pressure in the
cylinder to be released and brakes are applied by springs
inside the transmission.
3. Maintenance
The hydraulic fluid level must be checked periodically. (See
the Planned Maintenance Schedule.) If the reservoir regularly
requires the addition of oil to maintain the proper level, then a
leak is indicated and must be repaired. When scheduled, the
reservoir should be removed and drained for cleaning and
replaced with new oil. After refilling, check the lift, lower and
other hydraulic functions for proper operation. If the truck will
not lift a full load, then the pressure relief setting should be
checked and adjusted. During normal operation, the pressure
relief setting will not change. As the pump wears with age,
some loss performance will be experienced. When this loss
becomes severe, the pump should be replaced.
4. Adjustments
The only adjustment to the hydraulic system is the pressure
relief setting. This adjustment is made by removing the screw
cap on the pressure relief valve and turning the screw to
make the adjustment. Turning the screw in clockwise, will
increase the pressure relief setting. The relief pressure is
properly set when the truck will lift its rated weight capacity
plus 10%.
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