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WARNING
INJECTION HAZARD
To reduce the risk of serious injury, including fluid injection or splashing in the eyes or on the skin, or
injury from moving parts, always follow the Pressure Relief Procedure Warning, page 10, before
checking, adjusting, cleaning or shutting down the sprayer. Disconnect the spark plug!
Check everything in the chart before disassembling the sprayer.
PROBLEM
Engine/sprayer won't
start
Engine won't "pull over"
Engine operates, but
displacement pump
displacement pump
doesn't
Troubleshooting
CAUSE
Engine switch not on
Out of gas
Engine oil level low
Spark plug cable disconnected or
spark plug damaged
Water frozen in pressure control
Oil seepage into combustion
chamber
Pressure control switch turned OFF
Pressure setting too low
Displacement pump outlet filter dirty
Tip or tip filter clogged
Broken drive belt
Displacement pump rod seized by
dry paint
Connecting rod worn or damaged
Drive housing worn or damaged
Electrical power not energizing field
Clutch worn or damaged
Pinion assembly worn or damaged
SOLUTION
Turn on.
Replenish
Try starting engine. If light on rear of engine glows,
replenish oil.
Connect cable on top of engine or replace spark
plug.
Return pressure control to authorized Graco dealer
for repair.
Remove spark plug. Pull starter rope 3 or 4 times.
Clean or replace plug. Try to start. Keep sprayer
upright to avoid oil seepage.
Turn on.
Increase pressure.
Clean filter.
Clean tip or tip filter.
Replace belt.
Service pump. See page 24.
Replace. See page 15.
Replace. See page 16.
Check wiring connections. See page 19.
With pressure control switch ON and pressure
turned to MAXIMUM, use a test light to check for
power at black and white wires from pressure
control.
Have pressure control checked by authorized
Graco dealer.
Service. See page 18.
Service. See page 17.
308–327
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