31377610
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 311845.
Displacement rod is worn or damaged Replace rod. Manual 311845.
Fluid is spitting from gun
Air in pump or hose Check and tighten all fluid connections.
Reprime pump. Manual 313775.
Tip is partially clogged Clear tip. Manual 311254.
Fluid supply is low or empty Refill fluid supply. Prime pump. Manual
313775. 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 313775.
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.
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