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7. TROUBLESHOOTING
PROBLEM CAUSE
SOLUTION
Engine won’t run.
No fuel.
Carburetor out of adjustment.
Low-oil shutdown is shutting off
engine.
Add fuel.
Refer to Engine Operator’s Manual.
Add oil to proper level as indicated on
dipstick.
Pressure Loss.
Unloader valve has been
loosened (turned counter-
clockwise).
Hose inlet filter clogged.
Air in water.
Nozzle worn.
Pump worn.
Turn unloader clockwise until it locks at
original factory preset position.
Remove and clean.
Tighten all water hose fittings.
Replace nozzle.
Rebuild or replace pump.
No water at nozzle.
Water tap turned off.
Hose inlet filter-washer
completely plugged.
Plugged nozzle.
Turn on water.
Remove and clean.
Clear obstruction by blowing air back
through nozzle.
Spray pressure fluctuates.
Air in water inlet line.
Insufficient water flow.
Worn pump.
Maladjusted unloader valve.
Tighten all garden hose fittings.
Increase water source capability.
Rebuild or replace pump.
Readjust unloader to original factory preset.
Will not draw sufficient
detergent of fails to draw at
all.
Detergent hose foot strainer
plugged.
Air in detergent.
Injector is clogged.
Low pressure nozzle is clogged
or worn.
Remove from container and clean.
Check for air leaks in detergent hose and
fix.
Remove and clean injector.
Clean low pressure nozzle or replace.
Water flows into detergent
container as soon as water
hose is turned on.
Injector ball valve remains
open.
Dismantle injector and clean.
Noisy operation, knocking.
Worn or broken bearing.
Inadequate water supply to
pump.
Replace bearing as needed.
Ensure adequate water supply. Clear inlet.
Irregular spray pattern.
Pump is not primed.
Worn or partially clogged
nozzle.
Prime pump.
Clean or replace spray nozzle.
Excessive belt wear.
Pulley out of alignment.
Improper belt tension.
Pulley wobbles.
Realign pulleys.
Adjust tension.
Replace the pulley and check for a
damaged crankshaft or pulley.
