Section 7
Hydraulic System
20412971
8-2012/Rev 08
7-12
20. 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.
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. Loosen the hold down screws on the proximity switches to allow the hydraulic oil in the
cylinders and hoses to drain back to the reservoir. It will take approximately five minutes
for the oil to drain.
3. Drain the oil reservoir by connecting the inlet hose from an oil transfer pump to the drain
valve on the reservoir. Open the shut off valve on the drain and pump the used oil out to a
container. Close the shut off valve and remove the inlet hose from the drain valve.
The removed oil should not be reused. It is recommended that the empty reservoir
be flushed with a few gallons of clean oil to remove settled debris from the bottom
of the reservoir.
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