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PROBLEM
Excessive paint leakage into
throat packing nut
Fluid is spitting from gun
Excessive leakage around
hydraulic motor piston rod
wiper
Fluid delivery is low
The sprayer overheats
Excessive hydraulic pump
noise
Gallon counter not working
Sprayer operates, but display
does not
Troubleshooting
CAUSE
Throat packing nut is loose
Throat packings are worn or damaged
Displacement rod is worn or damaged
Air in pump or hose
Tip is partially clogged
Fluid supply is low or empty
Piston rod seal worn or damaged
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
Paint buildup on hydraulic components
Oil level is low
Low hydraulic fluid level
Broken or disconnected wire
Bad sensor
Missing or damaged magnet
Bad connection between control board and
display
Display damaged
Loose cables
Control board LED not flashing
SOLUTION
Remove throat packing nut spacer. Tighten
throat packing nut just enough to stop leakage.
Replace packings. Manual 309277.
Replace rod. Manual 309277.
Check and tighten all fluid connections.
Reprime pump. Manual 309892.
Clear tip. Manual 309741.
Refill fluid supply. Prime pump. Manual
309892. Check fluid supply often to prevent
running pump dry.
Replace these parts.
Increase pressure. See manual 309548.
Clean filter
Tighten
Bring sprayer to Graco distributor for repair
Use larger diameter or shorter hose
Clean
Fill with oil, page 8.
Shut off sprayer. Add fluid*, page 8.
Check wires and connections. Replace broken
wires.
Replace sensor
Replace magnet. Locate in correct spot.
Remove display and reconnect
Replace display
Connect cables to back of control board
Replace control board
309896
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