SECTION 9
HYDRAULIC SYSTEM
Jan 2002
Page 9-1
05114640
9 Hydraulic System
The hydraulic system drives the intensifier assembly to produce HP water. The
system is composed of a variable displacement pressure compensated piston
pump, driven by a motor.
The hydraulic system is designed to provide sufficient hydraulic oil flow at
sufficient pressure to supply the two intensifiers, at their specified maximum
output conditions of flow and pressure. Refer to Section 11, Specifications.
The waterjet pump “slow start” feature includes the hydraulic and the electrical
start circuits. Hydraulic pressure is automatically switched to low during
startup, working with the Wye-Delta motor start circuit to reduce motor load.
After a few seconds (time enough for the motor to reach full speed) hydraulic
pressure is automatically switched to the operator’s switch setting.
9.1 Overview
The hydraulic system includes two hydraulic circuits each with its own pump:
• Main hydraulic power circuit which uses the piston pump (discussed in this
section), and the
• Recirculation system which uses a gear pump mounted in tandem with the
piston pump (discussed in Section 10, Recirculation System).
A single pump and directional control valve (DCV) are used to control both
intensifier hydraulic cylinders. The hydraulic manifold, which includes the
solenoid–operated DCV, is mounted on the pump discharge port. The hydraulic
system also includes plumbing to connect pump, tank and intensifier cylinders.
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