Section 6
Hydraulic System
20425603
5-2005/Rev 0
6-13
21. While the machine is running and high pressure water is flowing, select low pressure
operating mode. Set the desired low operating pressure by adjusting the low pressure
control valve.
Hydraulic Pump or Electric Motor Replacement
The following procedures are used to replace the hydraulic pump or the electric motor.
The electric motor and hydraulic pump are mounted in tandem on both single and redundant
models. On redundant models, the hydraulic manifold is mounted on the hydraulic pump and
must be removed to replace the pump or the motor as described in the following procedures.
Hydraulic Pump Replacement
1. Turn the machine off and observe the appropriate Lockout/Tagout procedures.
Severe injury can result if the machine is not properly locked out. Observe
electrical Lockout/Tagout procedures before proceeding.
Ensure all pressure is relieved or blocked from the hydraulic and high pressure
circuits before proceeding.
2. Drain the hydraulic reservoir by connecting the inlet hose from an oil transfer pump to the
drain valve on the reservoir. Open the shutoff valve on the drain and pump the used oil
out to a container. Close the shutoff valve and remove the inlet hose from the drain valve.
Do not reuse the removed oil. It is recommended that the empty reservoir be
flushed with a few gallons of clean oil to remove settled debris from the bottom.
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