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Troubleshooting
WARNING
To reduce the risk of serious bodily injury, always fol-
low the
Pressure Relief Procedure W arning
on
page 4 before repairing the sprayer.
Check everything in the chart before disassembling the sprayer.
(Continued on page 25.)
PROBLEM
CAUSE
SOLUTION
Engine/sprayer won’t start
Engine switch not on
Turn on engine switch.
Out of gas
Refill gas tank.
Engine oil level low
Try starting engine. If light on rear of
engine
glows, replenish oil.
Spark plug cable disconnected or
spark plug damaged
Connect cable on top of engine or replace spark
plug.
Water frozen in pressure control
Return pressure control to authorized Graco
dealer for repair.
Engine won’t “fire”
Oil seepage into combustion
chamber
Remove spark plug. Pull starter rope 3 or 4 times.
Clean and replace plug. Try to start. Keep spray-
er upright to avoid oil seepage.
Engine operates, but displacement
pump doesn’t
Pressure control switch turned OFF
Turn on pressure control switch.
Pressure setting too low
Increase pressure.
Displacement pump outlet filter dirty
Clean filter.
Tip or tip filter clogged
Clean tip or tip filter.
Displacement pump rod seized by
dry paint
Service pump. See page 28.
Connecting rod worn or damaged
Replace connecting rod. See page 30.
Drive housing worn or damaged
Replace drive housing. See page 31.
Electrical power not energizing field
Check wiring connections. See page 36.
With pressure control switch ON and pressure
turned to MAXIMUM, use a test light to check
continuity across black and white wires from
pressure control.
Have pressure control checked by authorized
Graco dealer.
Clutch worn or damaged
Service clutch. See page 34.
Pinion assembly worn or damaged
Service pinion assembly. See page 32.
Engine starts but dies
Oil level drops below oil sensor
Add oil.
Displacement pump output low on
upstroke
Pump inlet screen clogged
Clean screen.
Piston ball check not seating
Service piston ball check. See page 26.
Piston packings worn or damaged
Replace packings. See page 26.
Sleeve gasket in displacement pump
worn or damaged
Replace sleeve gasket. See page 26.