General Pump Pump Installation and Service Manual - Manual (Page 8)

Avoid bends and restrictions in the inlet and outlet
plumbing. They force the motor.engine to work harder to
drive the pump (reduction of efficiency) and create
turbulence in the water flow which can cause cavitation
on the inlet side and premature wear in the pump and in
the outlet plumbing. Bends and restrictions will cause a
reduction in outlet pressure and increased amp draws
with and electric motor.
Use a thread sealant on all plumbing connections and
tighten all connections securely to avoid air entering the
system. Avoid using hosed which are secured with
hose clamps, they are very susceptible to air leaks,
and will not retain very high pressures. Permanently
coupled hoses with appropriately sized pipe threads
installed are the best way to connect hose to hard
plumbing. Air leaks in the inlet plumbing will cause a re-
duction of outlet pressure, noisy pump operation, and
excessive wear and tear on the pump.
When mounting the pulleys on the pump and motor/
engine, install them as close as possible to the crankcase
(and crankcase bearing) to avoid an excessive side
load on the rotating parts. Be sure that the pulleys
are properly aligned to avoid excessive belt and pulley
wear and belt noise. Do not overtighten belts to avoid
an excessive side load on the rotating parts.
Mount the motor/engine in relationship to the pump
such that when running, the rotation of the pump
crankshaft is counterclockwise as you face the
pump crankcase or pulley. A gas engine has only
one rotation direction, which may vary between
manufacturers. Be sure you know the rotation direction
before you begin assembly. Most electric motors may be
operated in either rotation direction by changing the
wiring. Check the manufacturer’s specifications of your
motor to determine the proper rotation direction for your
application.
Water and electricity can be a very dangerous combina-
tion. Use extreme caution when installing or working on
electrical components. Always use watertight conduit,
connections, boxes, motors, switches, and other
electrical components. Never allow a water spray or leak
to come in contact with any electrical components to
avoid serious bodily injury or property damage. If you are
not sure about your electrical requirements, component
selection, or hook-up, seek the advice of a professional
electrician.
Always install a guard over belts and pulleys which meets
OSHA standards to protect personnel from injury due to
contact with moving parts. Any moving part must be
covered to guard against serious bodily injury and
property damage.
Do not introduce acids or other caustic materials or any
abrasive into your pressure washer system or warranties
will be void and components in the system will be
damaged. Protect the pump and system from a freezing
condition.
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