Graco MAGNUM 309225W Operation Manual page 25

Problem
Motor is hot and runs intermittently.
This is NOT a thermal overload con-
dition. Motor automatically shuts off
due to excessive heat. Damage can
occur if cause is not corrected.
Thermal Overload, page 5.
Building circuit breaker opens after
sprayer operates for 5 to 10 minutes.
Fan pattern varies dramatically while
spraying.
OR
Sprayer does not turn on promptly
when resuming spraying.
Cannot trigger spray gun.
Spray comes out of spray gun in two
thick streams.
Paint is coming out of pressure
control switch.
Spray-Prime/Drain valve actuates
automatically relieving pressure
through drain tube.
Paint leaks down outside of pump.
309225W
Cause
Vent holes in enclosure are plugged
or sprayer is covered.
Extension cord is too long or not a
heavy enough gauge.
Unregulated electrical generator
being used has excessive voltage.
Sprayer was operated at high
pressure with very small tip which
causes frequent motor starts and
excessive heat build up.
Too many appliances are plugged in
on same circuit.
Sprayer electrical cord is damaged.
Extension cord is damaged or too
long or not a heavy enough gauge.
Pressure control switch is worn and
causing excessive pressure variation.
Spray gun trigger safety is locked.
Reversible spray tip is in UNCLOG
position.
Pressure control switch is worn.
System is over pressurizing.
Pump packings are worn.
Troubleshooting
Solution
Keep vent holes clear of
obstructions and overspray and
keep sprayer open to air.
Replace extension cord. Read
Grounding and Electrical
Requirements, page 5.
Use electrical generator with a
proper voltage regulator. Sprayer
requires 120VAC, 60 Hz,
1500-Watt generator.
Decrease pressure setting or
increase tip size.
Free up circuit (unplug things), or
use a less busy circuit.
Check broken insulation or wires.
Replace electrical cord if
damaged.
• Plug in something that you
know is working to test exten-
sion cord.
• Replace extension cord.
Take sprayer to Graco/magnum
authorized service center.
Rotate trigger safety lever to
unlock SAFETY, page 8.
Rotate arrow-shaped handle on
spray tip so it points forward in
SPRAY position.
Take sprayer to Graco/magnum
authorized service center.
Take sprayer to Graco/magnum
authorized service center.
Replace pump packings.
25