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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
reservoir has a very fine mesh screen strainer
which prevents foreign material from entering the
oil system.
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 back to
the reservoir 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 pressure oil galley, and the return oil
galley that internally connects to the reservoir. See
figure 1-3.
The main component of the valve is an adjustable
spring loaded plunger that when it is pushed off
from its seat by the oil pressure the oil then flows
back into the reservoir. See figure 1-4. Turning the
adjustment nut clockwise increases the amount of
oil pressure required to open the valve, and turning
it counterclockwise decreases the amount of oil
pressure. (See adjustment section for specifica-
tion.)
82206-102
MAIN PRESSURE
OIL GALLERY (internal)
MINI-VALVES
OIL RESERVOIR
PUMP
OUTLET
PUMP
INLET
PRESSURE
RELIEF VALVE
MOTOR/PUMP
ASSEMBLY
MAIN RETURN
OIL GALLERY
(internal)
82206-103
PRESSURE RELIEF
ADJUSTMENT NUT
PRESSURE
GAUGE
SPRING
LOADED
PLUNGER
PRESSURE
RETURN
82206-104
PRESSURE RELIEF
ADJUSTMENT NUT
PRESSURE
GAUGE
SPRING
LOADED
PLUNGER
OIL LINE
FROM
PUMP
OIL RESERVOIR
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