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Hydraulic Powered Pressure Washer
Symptom
Pump runs but produces no flow
Pump loses prime
Chattering noise, pressure fluctuates
Low pressure at nozzle
Unit makes knocking noises
The unit makes chattering noise
Unit doesn't develop good pressure
TROUBLE SHOOTING
(Both hydraulic and water systems
Probable Cause
Corrective Action
Pump is not primed
Flood suction line then restart pump. Check the screen
In the pump inlet hose fitting.
Nozzle in low PSI mode
Pull or push nozzle into High PSI mode.
Nozzle plugged
Clean nozzle. (see nozzle-cleaning brochure)
Air leak in suction hose or
Remove suction hose and test for leaks by pressurizing
inlet fittings
with water. Make sure thread sealant has been used on
all fittings.
Suction line is blocked,
Inspect it for a loose liner, kinks or debris lodged in
collapsed, or too small
hose.
Clogged suction strainer
Clean strainer.
Unloader valve is by-passing
Make sure unloader is adjusted properly and by-pass
seat is not leaking.(unloader valve adjustment brochure)
Incorrect or worn nozzle
Make sure nozzle is matched to the flow and pressure
of the pump. If the nozzle is worn, replace it.
Restricted intake
Refer to priming info.
Dirt in check valves
Clean check valves. (see check valve cleaning brochure)
Almost always caused by
Check the suction line for kinks, restrictions, clogged
not being able to get
inlet line or strainer, too many elbows, or a reducer
enough water at the inlet
fitting installed in the line somewhere.
The water suction line is too
A ¾" diameter line is recommended. If the line is
Small for its length
real long, 1" diameter may be needed.
The water level in the supply
The pump should always be below the water level in
tank is too low
the supply tank.
The unloader valve on the
Try adjusting the unloader valve to reduce its pressure
water pump is unloading
setting. This can also be caused by the vehicle's
hydraulic system relief valve being set too close to
The operating pressure required by the pressure
Washer. The hydraulic relief valve must be set at
Least 300 PSI above the operating pressure of the
washer. This should be checked with a pressure gauge.
Particles of dirt or sand
Remove spray tip orifice and clean.
in the spray tip orifice
Dirt in check valves
Clean check valves. (see check valve cleaning brochure)
Not enough oil getting
Increase vehicle RPM. Check circuit with a hydraulic
to the hydraulic motor flow
flow meter to assure that the flow meets minimum
meter
requirements.
Hydraulic motor slowing
Vehicle system pressure relief valve may be set to
or stalling
low. It should be checked with a pressure gauge to
assure that it is set at a high enough pressure.
The spray nozzle orifice
Inspect this orifice for wear or incorrect sizing and
may be wore out
replace if necessary.
)
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