Troubleshooting
3A1222B 11
Problem Cause Solution
Pump cycles but pressure does
not build up.
Pump not primed. Prime pump.
Inlet screen clogged. Clean debris off inlet screen
Suction tube not immersed. Reposition suction tube in bottom of paint pail.
Paint pail empty. Refill paint pail and reprime sprayer.
Suction tube has vacuum air leak. Tighten suction tube connection. Inspect for cracks or
vacuum leaks. If cracked or damaged, replace.
Pump check valves are dirty or
damaged.
Return sprayer to Graco/M
AGNUM authorized service
center.
Prime/Spray valve worn or
obstructed with debris.
Pump check ball stuck. See “Pump will not prime” section of Troubleshooting
table. Press pump priming button two times.
Cannot pull gun trigger. Gun trigger safety engaged. Remove gun trigger safety
Gun stops spraying. Spray tip clogged. 1 Turn arrow-shaped handle to unclog position.
2 Aim gun into waste pail.
3 Squeeze trigger.
4 Return arrow-shaped handle to spray position and
begin spraying.
Pump cycles but paint only
dribbles or spurts when trigger is
pulled.
Pressure is set too low. Turn pressure control knob right to increase pressure.
Spray tip clogged. Clean tip. See “Gun stops spraying” section of
Troubleshooting table.
Spray tip too large or worn. Replace tip.
Gun filter clogged. Clean or replace gun filter.
Fluid filter is clogged. Clean or replace fluid filter.
Pump check ball stuck. See “Pump will not prime” section of Troubleshooting
table.
Pressure set at maximum, but
cannot achieve good spray
pattern.
Tip is too large for sprayer. Select smaller tip.
Tip is worn beyond capability of
sprayer.
Replace tip.
Gun filter clogged. Clean or replace gun filter.
Inlet screen clogged. Clean debris off inlet screen.
Pump valves worn. Check for worn pump valves:
1 Prime sprayer with paint.
2 Trigger gun momentarily. When trigger is released,
pump should cycle and stop.
3 If pump continues to cycle, pump valves may be
worn.
4 Return sprayer to Graco/M
AGNUM authorized
service center.
Fluid filter clogged. Clean or replace fluid filter.
Extension cord too long or not
heavy enough gauge.
Replace cord, Grounding Information, page 5.
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