9.800-416.0 • Rev. 11/17
PRESSURE WASHER Troubleshooting Guide
12
TROUBLESHOOTING
PROBLEM
POSSIBLE CAUSE
SOLUTION
LOW OPERATING
PRESSURE
Faulty pressure gauge
Install new gauge.
Insufficient water supply
Use larger garden hose; clean filter washer
at water inlet.
Old, worn or incorrect spray nozzle
Match nozzle number to machine and/or
replace with new nozzle.
Plumbing or hose leak
Check plumbing system for leaks. Retape
leaks with teflon tape.
Faulty or misadjusted unloader valve
(where applicable)
Adjust unloader for proper pressure. Install
repair kit when needed.
Note: Tampering
with the factory setting may cause personal
injury and/or property damage, and will void
the manufacturer's warranty.
Worn packing in pump
Install new packing kit.
Fouled or dirty inlet or discharge
valves in pump
Clean inlet and discharge valves.
Worn inlet or discharge valves
Replace with valve kit.
Slow engine RPM
Set engine speed per specifications
(approximately 2800 RPM - 3400 RPM)
FLUCTUATING
PRESSURE
Valves worn
Check and replace if necessary.
Blockage in valve
Check and clean out if necessary.
Pump sucking air
Check water supply and suction line for air
seepage at joints.
Worn piston packing
Check and replace if necessary.
PRESSURE LOW
AFTER PERIOD
OF NORMAL USE
Nozzle worn
Check and replace if necessary.
Inlet or discharge valves blocked or
worn
Check and clean or replace if necessary.
Unloader valve seat worn
Check and replace if necessary.
PUMP NOISE
Air suction line
Check water supply and connections on
suction line.
Broken or weak inlet or discharge
valve springs
Check and replace if necessary.
Foreign matter in valves
Check and clean if necessary.
Worn bearings
Check and replace if necessary.
Excessive temperature of liquid
Reduce to below 180°F (75°C)
