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H8191 3600 PSI Diesel Pressure Washer
-11-
Break-In
The first 20 hours of operation is considered the
break-in period. Be sure to follow the maintenance
schedule on Page 16 after 20 hours of use.
NOTICE
Failure to follow the break-in maintenance
schedule can reduce the lifespan of
the machine and negatively impact
performance.
Adjusting Pressure
DO NOT attempt to increase the maximum
pump pressure by modifying controls or
otherwise altering the machine. A higher
pressure setting than the factory set
maximum pressure may damage the pump
or cause components to fail, resulting in
serious personal injury.
The pressure setting on the Model H8191 was
preset at the factory to achieve optimum pressure
for general purpose cleaning.
To adjust the pressure:
• 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 water pressure
adjustment knob counterclockwise to lower
the pressure (
Figure 8). Once you have
finished using your pressure washer, return
the regulator to its original position by turning
it clockwise.
Figure 8. Water pressure adjustment knob.
• 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 H8191 pressure washer is equipped
with five spray nozzles housed in receptacles on
the front panel. Each nozzle is color coded and
delivers a specific spray pattern for a particular
cleaning purpose. The 0°, 15°, 25°, and 40°
nozzles are high pressure nozzles; the chemical
nozzle is a low pressure nozzle.
Water Pressure
Adjustment Knob