31102110
Troubleshooting
PROBLEM CAUSE SOLUTION
Excessive paint leakage into
throat packing nut
Throat packing nut is loose Remove throat packing nut spacer. Tighten
throat packing nut just enough to stop leakage.
Throat packings are worn or damaged Replace packings. Manual 309277.
Displacement rod is worn or damaged Replace rod. Manual 309277.
Fluid is spitting from gun
Air in pump or hose Check and tighten all fluid connections.
Reprime pump. Manual 311018.
Tip is partially clogged Clear tip. Manual 311254.
Fluid supply is low or empty Refill fluid supply. Prime pump. Manual
311018. Check fluid supply often to prevent
running pump dry.
Excessive leakage around
hydraulic motor piston rod
wiper
Piston rod seal worn or damaged Replace these parts.
Fluid delivery is low Pressure setting too low
Displacement pump outlet filter (if used) is
dirty or clogged
Intake line to pump inlet is not tight
Hydraulic motor is worn or damaged
Large pressure drop in fluid hose
Increase pressure. See manual 311018.
Clean filter
Tighten
Bring sprayer to Graco distributor for repair
Use larger diameter or shorter hose
The sprayer overheats Paint buildup on hydraulic components Clean
Oil level is low Fill with oil, page 7.
Excessive hydraulic pump
noise
Low hydraulic fluid level Shut off sprayer. Add fluid*, page 7.
Gallon counter not working Broken or disconnected wire Check wires and connections. Replace broken
wires.
Bad sensor Replace sensor
Missing or damaged magnet Replace magnet. Locate in correct spot.
Sprayer operates, but display
does not
Bad connection between control board and
display
Remove display and reconnect
Display damaged Replace display
Loose cables Connect cables to back of control board
Control board LED not flashing Replace control board
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