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Troubleshooting
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 CAUSE SOLUTION
The engine or sprayer won’t
start
The engine switch is not on. Turn on the switch.
s
t
ar
t
.
The engine is out of gas. Refill the gas tank. See page 8.
The engine oil level is low. Try to start the engine. Replenish the oil, if nec-
essary. See Step 4, page 6.
The spark plug cable is disconnected or it is
damaged
Reconnect the spark plug cable or replace the
spark plug.
There is frozen water in the pressure control. Allow the sprayer to thaw completely before
starting it.
The engine won’t “pull over”. There is oil seeping into the combustion
chamber.
Remove the spark plug. Pull the starter rope 3
or 4 times. Clean or replace the plug. Try to
start the engine. Keep the sprayer upright to
avoid oil seepage.
The engine operates, but the
dis
p
lacement
p
um
p
does not
The pressure control switch is turned off. Turn on the switch.
di
sp
l
acemen
t
pump
d
oes no
t
operate. The pressure setting is too low. Turn the pressure adjusting knob clockwise to
increase pressure.
The fluid filter (51) is dirty. Clean the filter. See page 12.
The tip or the tip filter is clogged. Clean the tip or the tip filter. See the gun
instruction manual.
The displacement–pump rod is stuck due to
dried paint.
Repair the pump. See manual 307806.
The connecting rod is worn or damaged. Replace the connecting rod. See page 15.
The drive housing is worn or damaged. Replace the drive housing. See page 16.
The electrical power is not energizing the field. Check the wiring connections. See page 23.
With the pressure control switch turned on and
the pressure turned to maximum, use a test
light to check the power at the black and white
wires from the pressure control.
Have the pressure control checked by an au-
thorized Graco dealer.
The clutch is worn, damaged, or incorrectly
positioned.
Replace the clutch. See page 20.
The pinion assembly is worn or damaged. Repair or replace the pinion assembly. See
page 18.