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The main component of the valve is an adjustable
spring loaded plunger that is pushed off from its
seat by the oil pressure. The oil then flows back into
the reservoir. See figure 1-4. Turning the adjust-
ment nut clockwise increases the amount of oil
pressure required to open the valve, and turning it
counterclockwise decreases the amount of oil pres-
sure. (See adjustment section for specification.)
e. Hydraulic Lines, Fittings, Connections - They
provide a path for the hydraulic oil.
f. Hydraulic Cylinders - They convert the hydraulic
fluid pressure and volume into mechanical motion.
1-2. Component Operation
a. Motor/Pump Operation
The motor/pump assembly is a gear type pump that
provides the oil pressure and volume for the entire
hydraulic system. The pump has an inlet side and
an outlet side. The inlet side is connected to the
reservoir which provides the oil supply. The reser-
voir has a very fine mesh screen strainer which
prevents foreign material from entering the oil sys-
tem.
The output line of the pump is connected to the main
oil galley which is internal and common to all the
hydraulic mini-valves and pressure relief valve.
Also, common to the hydraulic mini-valves and
pressure relief valve is an oil galley that internally
connects to the oil reservoir to provide a return path
for the hydraulic oil. See figure 1-2.
Figure 1-4. Pressure Relief Valve Functioning
Figure 1-3. Pressure Relief Valve Not
Functioning
Figure 1-2.
b. Pressure Relief Valve
This device provides an alternate oil path when the
hydraulic cylinders reach the end of their stroke
and the pump continues to run. If this path were not
provided, the pump motor would stall because the
oil cannot be compressed. The pressure relief
valve is directly connected to the mini-valve bodies
and shares both the common internal main pres-
sure oil galley, and the return oil galley, that inter-
nally connect to the reservoir. See figure 1-3.
041905.021m
MAIN PRESSURE
OIL GALLERY (internal)
MINI-VALVES
OIL RESERVOIR
PUMP
OUTLET
PUMP
INLET
PRESSURE
RELIEF VALVE
MOTOR/PUMP
ASSEMBLY
MAIN RETURN
OIL GALLERY
(internal)
050305.06
PRESSURE RELIEF
ADJUSTMENT NUT
PRESSURE
GAUGE
SPRING
LOADED
PLUNGER
PRESSURE
RETURN
050305.07
PRESSURE RELIEF
ADJUSTMENT NUT
PRESSURE
GAUGE
SPRING
LOADED
PLUNGER
OIL LINE
FROM
PUMP
OIL RESERVOIR
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