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16 308-125
Troubleshooting
WARNING
T
o reduce the risk of serious injury whenever you
are instructed to relieve pressure, always follow the
Pressure Relief Procedure
on page 8.
Check everything in the guide before disassembling
the sprayer
.
Relieve the pressure before disassembling the spray
-
er.
PROBLEM CAUSE SOLUTION
Engine/sprayer won’t start
Engine switch not on
T
urn 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.
Adjusting the pressure control knob
doesn’t
start pump
Return pressure control to authorized Gra-
co dealer for repair.
Engine won’t “fire” or
“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 seepage.
Engine operates, but
displacement pump doesn’t
Pressure control switch turned OFF
T
urn on pressure control switch.
Also see manual 308–126.
Pressure setting too low
Increase pressure.
T
ip clogged
Clean tip.
Displacement pump rod seized by
dry coating
Service pump. See page 19.
Connecting rod worn or damaged
Replace connecting rod. See page 22.
Drive housing worn or damaged
Replace drive housing. See page 23.
Electrical power not energizing field
Check wiring connections. See page 28.
With pressure control switch ON and pres-
sure
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 clutch. See page 26.
Pinion assembly worn or damaged
Service pinion assembly
. See page 24.