General Pump Pump Installation and Service Manual - Manual (Page 3)

TYPICAL PRESSURE WASHER SYSTEM
WAND SPRAY GUN SPRAY TIP
HIGH
PRESSURE
HOSE
CHEMICAL
INJECTOR
UNLOADER OR
REGULATOR VALVE
PRESSURE
GAUGE
PRESSURE
RELIEF VALVE
PULSATION
DAMPENER
PUMP
THERMAL
RELIEF
VALVE
FLUID
BY-PASS
HOSE
INLET FILTER
POWER SOURCE
(MOTOR/ENGINE)
Drive
System
3
DESIGNING
YOUR SYSTEM
PUMP SELECTION
The heart of any pressure washer system is the high
pressure pump. Size the pump according to your clean-
ing needs. Higher than required pressure and volume will
cause needless wear of all components in the system,
and could actually damage your work surface instead of
cleaning it. Never exceed the maximum pressures of ro-
tation speed as is stated on the Technical Data Sheet
supplied with each pump.
Refer to the Pump Data Sheet to determine what pump
RPM is needed to deliver your required GPM output.
MOTOR/ENGINE SELECTION
The size of the electric motor or gas engine required to
drive your pump is determined by the pump GPM and
PSI output desired. Refer to the Technical Data Sheet
supplied with each pump, or the following chart. Both
charts are based on electric horsepower requirements;
for gas engines multiply by 1.8. Gas engine output
horsepower varies with running RPM. Be sure to run a
gas engine fast enough to supply required horsepower,
but do not exceed manufacturer’s specifications.