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308-709
Troubleshooting
WARNING
To reduce the risk of serious bodily injury always
follow the Pressure Relief Procedure Warning on
page 12 before checking, adjusting, cleaning or
shutting down the sprayer.
Check everything in the chart before disassembling the sprayer.
(Continued on page 15)
PROBLEM
CAUSE
SOLUTION
Engine/sprayer won’t start
Engine switch not on
Turn on.
Out of gas
Replenish
Engine oil level low
Try starting engine. If light on rear of en-
gine glows, replenish oil.
Spark plug cable disconnected or
spark plug damaged
Connect cable on top of engine or re-
place spark plug. See Fig. 1, page 5.
Water frozen in pressure control
Return pressure control to authorized
Graco dealer for repair.
Engine won’t “pull over”
Oil seepage into combustion
chamber
Remove spark plug. Pull starter rope 3 or
4 times. Clean and replace plug. Try to
start. Keep sprayer upright to avoid oil
leakage. See last CAUTION on page 10.
Engine operates, but dis-
placement pump doesn’t
Pressure control switch turned OFF
Turn on.
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 18.
Connecting rod worn or damaged
Replace. See page 18.
Drive housing worn or damaged
Replace. See page 19.
Electrical power not energizing field
Check wiring connections. See pages 16
and 33.
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 autho-
rized Graco dealer.
Clutch worn or damaged
Service. See page 24.
Pinion assembly worn or damaged
Service. See page 20.
