Basic Troubleshooting - Graco MAGNUM 232738 Repair Manual

The following troubleshooting guidelines are included here as preemptive measures against Advanced
Troubleshooting, page 11.
Problem
Power switch is on and sprayer
is plugged in, but motor does
not run and pump does not
cycle
Pump does not prime
Spray gun stopped spraying
Pump cycles but does not build
up pressure
Pump cycles but paint only
dribbles or spurts when spray
gun is triggered
309477F

Basic Troubleshooting

Cause
Pressure is set at zero
pressure
Motor control is damaged
Electrical outlet is not providing
power
Extension cord is damaged
Sprayer electrical cord is
damaged
Paint is frozen or hardened in
pump
Spray-PRIME valve is in
SPRAY position
Inlet screen is clogged or
suction tube is not immersed
Balls in check valve are stuck
or check valves are damaged
Suction tube is leaking
Spray tip is plugged
Pump is not primed
Inlet screen is clogged or
suction tube is not immersed
Paint pail is empty
Suction tube is leaking
Pump check valves are dirty or
damaged. (Usually only one
valve)
Prime/Spray valve is worn or
obstructed with debris
Pressure is set too low
Spray tip is plugged
InstaClean fluid filter is clogged
(XR9 only)
Spray gun fluid filter is clogged Clean or replace spray gun fluid filter.
Solution
Turn pressure control knob counterclockwise to
increase pressure setting.
See Motor Does Not Operate, page 11.
• Try a different outlet or plug in something that
you know is working to test outlet
• Reset building circuit breaker or replace fuse
Replace extension cord. See Grounding and
Electrical Requirements, page 7.
Check for broken insulation or wires. Replace
electrical cord if damaged.
See Motor Does Not Operate, page 11.
Turn Prime/Spray valve to PRIME position
(pointing down).
Clean debris off inlet screen and make sure
suction tube is at bottom of paint pail.
Clean or replace check valves. See Pump
Service, page 20. Do not store in water.
Tighten suction tube connection. Inspect for other
cracks or vacuum leaks.
Unplug spray tip. Manual 309097.
Prime pump.
Clean debris off inlet screen and make sure
suction tube is at bottom of paint pail.
Refill paint pail and reprime sprayer.
Tighten suction tube connection. Inspect for other
cracks or vacuum leaks.
Clean or replace check valves. See Pump
Service, page 20.
Check Prime/Spray valve for debris trapped on
seat and worn parts. Torque to 21 N·m (185 in-lb).
Slowly turn pressure control knob clockwise to
increase pressure setting. Sprayer should develop
more pressure.
Unplug spray tip. Manual 309097.
Clean or replace InstaClean fluid filter.
Basic Troubleshooting
9