Troubleshooting
34
3Z9478A
Troubleshooting
Problem
Cause
Solution
Pump will not prime
HINT:
•
Attempt to free check balls by
tapping side of inlet valve as
sprayer is stroking.
•
Strain paint before spraying.
Keep sand and debris out.
•
Thoroughly flush after every
paint job.
•
Do not store in water. Use
Pump Armor or mineral spir-
its.
Prime/Spray valve set at SPRAY.
Turn Prime/Spray valve to PRIME.
Inlet screen clogged.
Clean debris off inlet screen.
Suction tube is not immersed.
Reposition suction tube in bottom of paint pail.
Inlet valve check ball stuck.
Remove tube. Insert end of pencil into inlet section to
dislodge ball. OR Power Flush unit, page 20.
Outlet valve check ball stuck.
Use screw driver to open Easy-Access door. Unscrew
outlet valve. Remove and clean assembly.
Suction tube is leaking.
Tighten suction tube connection. Inspect for cracks or
vacuum leaks.
Prime/Spray valve clogged.
Clean/replace drain tube as necessary. Return sprayer
to Graco/M
AGNUM
authorized service center if drain
valve is clogged.
Power switch is on and sprayer is
plugged in but pump does not
cycle.
Pressure set at minimum.
Turn pressure control knob right to increase pressure.
Electrical outlet is not providing
power .
•
Try a different outlet OR test outlet by plugging
something in that you know is working.
•
Reset building circuit breaker or replace fuse.
Damaged extension cord.
Replace extension cord. See Grounding and Electrical
Requirements, page 10.
Damaged sprayer electrical cord .
Check for broken insulation or wires. Replace damaged
electrical cord.
Motor or control damaged.
Return sprayer to authorized Graco service center.
Paint frozen or hardened in pump. Unplug sprayer from electrical outlet.
If paint if frozen in sprayer:
Do NOT try to start frozen sprayer. Thaw completely or
you may damage motor, control board and/or drivetrain.
1 Turn OFF power switch.
2 Place sprayer in warm area for several hours.
3 Plug in and turn on sprayer.
4 Slowly increase pressure until motor starts.
If paint hardened in sprayer:
1 Replace pump packings.
2 Remove all residue from valves and passages.