SECTION 9
HYDRAULIC SYSTEM
Jan 2003
p. 9-2
80073463
NOTE
The main pump is direct-mounted to the motor. The main pump control
includes hi and lo preset pressures. The operator is able to switch between
pressures at the operator’s console.
Item Description
(1) HI pressure control (2) LO pressure control (3) Fixed relief valve
(4) Gage (5) Manifold (6) Pump
(7) Motor (8) Directional Control Valve (9) Hydraulic Cylinder
(10) Hi-Lo Solenoid Valve
9.2 Operation
The hydraulic system operates at HI (high) or LO (low) pressure settings
up to the maximum flow capacity of the variable displacement piston
pump. Upon selecting HI or LO, the operator is able to adjust the HI or
LO pressure controls within the respective adjustment ranges.
The electric motor (7) drives the variable displacement, pressure
compensated pump (6). The hydraulic manifold (5) is mounted on the
pump discharge. The flow from the pump passes through check valve to
the directional control valve (8), and the directional control valve sends
the flow to the hydraulic cylinders (9) in one direction until the piston
activates the proximity switch at the end of the stroke. The activated
proximity switch sends an electrical signal to the programmable
controller (PLC). This PLC in turn activates the directional control valve
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