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Troubleshooting
Relieve the pressure (see page 5) before you proceed with troubleshooting.
PROBLEM CAUSE SOLUTION
Engine not starting or
hard to start
No gasoline in fuel tank or carburetor
Low oil
Start/Stop switch in STOP position
Water in fuel, or old fuel
Engine flooded or improperly choked
Dirty air cleaner filter
Spark plug dirty, wrong gap, or wrong type
Gun not triggered
Fill the tank with gasoline, and open fuel shut off valve.
Check fuel line and carburetor.
Add oil to proper level.
Move switch to START position.
Drain fuel tank and carburetor. Use new fuel, and make
sure dry spark plug is dry.
Open choke, and crank engine several times to clear
out gas. Make sure spark plug is dry.
Remove and clean.
Clean, adjust the gap, or replace.
Trigger gun while starting engine.
Engine missing or
lacking power
Partially plugged air cleaner filter
Spark plug dirty, wrong gap, or wrong type
Remove and clean.
Clean, adjust the gap, or replace.
Pressure too low
and/or pump running
roughly
Worn or wrong size tip
Inlet filter clogged
Worn packings, abrasives in water, or
natural wear
Inadequate water supply
Belts slipping
Fouled or dirty inlet or discharge valves
Restricted inlet
Worn inlet or discharge valves
Leaking high-pressure hose
Replace with tip of proper size.
Clean. Check more frequently.
Check filter. Replace packings. See Pump Service on
page 8.
Check water flow rate to pump.
Tighten or replace; use correct belts, and replace both
at same time.
Clean inlet and discharge valve assemblies. Check filter.
Check if garden hose is collapsed or kinked.
Replace worn valves. See Pump Service on page 8.
Replace high-pressure hose.
Water leaking from
under pump manifold
Worn packings Install new packings. See Pump Service on page 8.
Water in pump oil Humid air condensing inside crankcase
Worn packings
Oil seals leaking
Change oil as specified in Maintenance on page 7.
Install new packings. See Pump Service on page 8.
Install new oil seals. See Pump Service on page 8.
Packings failing
frequently or
prematurely.
Scored, damaged, or worn plungers
Abrasive material in the fluid being
pumped
Inlet water temperature too high
Overpressurizing pump
Excessive pressure due to partially
plugged or damaged tip
Pump running too long without spraying
Running pump dry
Install new plungers. See Pump Service on page 8.
Install proper filtration on pump inlet plumbing.
Check water temperature. It should not exceed
160_F (70_C).
Do not modify any factory-set adjustments. See
EQUIPMENT MISUSE HAZARD on page 3.
Clean or replace tip. See Installing and Changing
Spray Tips on page 6.
Never run pump more than 10 minutes without spraying.
Do not run pump without water.
Strong surging at inlet,
and low pressure on
discharge side
Foreign particles in the inlet or discharge
valve, or worn inlet and/or discharge
valves
Clean or replace valves. See Pump Service on
page 8.