Break-In
The first 20 hours of operation is condistered the
NOTICE
Failure to follow the
Adjusting Pressure
DO NOT attempt to increase the pump pressure by tampering with controls or otherwise altering the machine. A higher pressure setting than the factory set pressure may damage the pump or cause components to fail resulting in serious personal injury.
The pressure setting on the model H8189/H8190 was preset at the factory to achieve optimum pressure for general purpose cleaning. If you need to lower the pressure, it can be accomplished by these methods:
•BACK AWAY FROM THE SURFACE TO BE CLEANED. Moving further away reduces the pressure on the workpiece.
•SELECT A DIFFERENT NOZZLE. Nozzles with a wider angled spray deliver a less powerful stream.
•ADJUST THE PRESSURE REGULATOR ON THE PUMP. Turn the pressure regulator knob
Water Pressure
Adjustment Knob
Figure 6. Reducing the pump pressure.
•REDUCE ENGINE SPEED. Slowing the engine will reduce the pressure created by the pump.
NOTICE
Engine speed should always be set high enough to handle the load of the pump. If the engine speed is too low, the motor may bog or stop when the spray gun trigger is pulled and the pump is activated. Operating the engine speed at such a setting can cause excessive engine wear and premature engine failure.
Changing Nozzles
The model H8189/H8190 pressure washer is equipped with five spray nozzles located in receptacles on the front panel. Each nozzle is color coded and delivers a specific spray pattern for a particular cleaning purpose. The size of the nozzle determines the shape and pressure of the spray. The 0°, 15°, 25°, and 40° nozzles are high pressure nozzles; the chemical nozzle is a low pressure nozzle.
To change nozzles on the H8189/H8190:
1.FOLLOW THE SHUTDOWN PROCEDURE ON PAGE 14!
H8189/H8190 Gasoline Pressure Washer
