Operation; Pressure Washer Terminology - Simpson PS60869 Instruction Manual

NOTICE: The engine is shipped without oil. Before starting engine, add the oil
provided. Damage to the engine will occur if the engine is run without oil, this
damage will not be covered under warranty.
NOTICE: The high-pressure pump was filled with oil at the factory. Always check oil
level before using (refer to Maintenance for more information).

PRESSURE WASHER TERMINOLOGY

PSI: Pounds per Square Inch. The unit of measure for water pressure. Also used
for air pressure, hydraulic pressure, etc.
GPM: Gallons per Minute. The unit of measure for the flow rate of water.
CU: Cleaning Units. GPM multiplied by PSI equals CU.
Bypass Mode: Allows water to re-circulate within the pump when the gun trigger is
not pulled. This feature allows the operator to release the trigger gun and reposition
themselves without having to turn the engine off in between cleaning actions.
NOTICE: Allowing the unit to run for more than two minutes without the gun trig-
ger being pulled could cause overheating and damage to the pump. Do not let the
pressure washer run for more than two minutes in Bypass Mode. Turn off the engine
and relieve the pressure in the gun during these extended situations.
Thermal Relief Valve (P, Fig. 5): When the temperature inside the
pump rises too high, this valve will open and release a gush of
water in an effort to lower the temperature inside the pump. The
valve will then close.
Detergent Injection System: Mixes cleaners or cleaning solvents
with the water to improve cleaning effectiveness.
Water Supply: All pressure washers must have a source of water. The minimum
requirements for a water supply are 20 PSI and 5 Gallons Per Minute. If your water
source is a well, the garden hose length can only be 30 ft. (9 m) max.
WARNING: To reduce the possibility of contamination always protect
against backflow when connected to a potable water system.
PRESSURE WASHER OPERATING FEATURES
PRESSURE ADJUSTMENTS
The pressure setting is preset at the factory to achieve op ti mum pres sure and
cleaning. If you need to lower the pres sure, it can be accomplished by these meth-
ods.
1. Back away from the sur face to be cleaned. The further away you are, the
less the pressure will be on the surface to be cleaned.
2. Change to the 40˚ nozzle (white). This nozzle delivers a less powerful stream
of water and a wider spray pattern. Refer to How To Use Spray Wand.
3. This pressure washer's high pressure pump is equipped with an adjustable
unloader feature that allows the pressure setting to be adjusted.
To lower the pressure, turn the pressure control knob on the pump counter-
clockwise to the desired pressure.
To return the pump pressure to the factory setting, turn the pressure control
knob on the pump clockwise until it stops.

OPERATION

12- ENG
5
P