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TROUBLESHOOTING GUIDE
WARNING
Pressure Relief Procedure
To reduce the risk of serious bodily injury, including fluid
5.
Engage the gun safety latch.
injection, splashing in the eyes or on the skin, or injury
you shut off the sprayer, checking, adjust or clean the open until you start the sprayer again.
system, or change spray tips.
7. Disconnect the spark plug cable.
I . Engage the gun safety latch.
lfyou suspect that the hose ortip is cornpletelyclogged
2. Turn the engine stop lever to OFF.
steps above, VERY SLOWLY loosen a hose end fitting
or that pressure is not fully relieved affer following the
3. Flip the pressure control switch
to OFF.
or the tip guard retaining nut and relieve pressure
4. Disengage the gun safety latch. Holding a
metal part
gradually. Now clear the tip or hose.
of the gun firmly to the side of a grounded metal pail,
trigger the gun.
from moving parts, always follow this procedure when
6. Open the fluid pressure drain valve and leave it
Check everything in the guide before disassembling the sprayer.
PROBLEM
Engine/sprayer won't start
Engine won't pull over.
Gas engine operates but
displacement pump doesn't
operate
CAUSE
Engine switch not ON
Engine oil level low
Spark plug cable disconnected or
spark plug bad
Out of gas
Water frozen in pressure control.
Oil seepage into combustion cham-
ber.
Pressure control switch turned OFF
Pressure setting too low
Displacement pump outlet filter dirty
or clogged
Tip or tip filter clogged
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
'inion assembly worn or damaged
SOLUTION
Turn on.
Try starting engine. If light on rear of
engine glows, replenish oil.
Connect cable on top of engine or re-
place spark plug.
Replenish.
Return pressure control to authorized
Graco dealer for repair.
3 or 4 times. Clean and replace plug.
Remove spark plug. Pull engine over
Try
to
start. Keep sprayer upright to
avoid seeoaoe.
Turn on.
Increase pressure,
Clean filter
Clean tip or tip filter.
Service pump. See
307-806.
Replace. See page 22.
Replace.
See
page 24.
Check wiring connections. See page
19.
With pressure control switch ON and
pressure turned to MAXIMUM, use a
test light to check continuity across
control.
black and wire wires from pressure
Have pressure control checked by
authorized Graco dealer.
Service. See page 28.
Service. See page 25.
Continued on Raoe
18
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