Graco LineLazer GM 3500 Instructions-Parts List Manual page 25

Troubleshooting
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PROBLEM
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CAUSE
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SOLUTION
1
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Displacement pump output low on Pump inlet screen clogged Clean screen.
downstroke or both strokes
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Pressure setting too
low
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Step 14, page 13.
Increase pressure. See Startup,
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Dirty outlet filter, tip filter or tip
Clean and service intake valve. See page 26. Intake valve ball check not seating
Replace packings. See page 26.
Piston packings worn or damaged
Clean filters and/or tips.
properfy
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Engine RPM too low
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Increase throttle setting. See Startup,
Steps 5b and 14, page
13.
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Clutch worn or damaged
Replace clutch. See page 34.
Partially clogged suction tube assembly Remove and clean suction tube. During normal
flushing remove and clean the suction tube as-
sembly separately to prevent further clogging.
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Large pressure drop in hose Use larger diameter hose.
Paint leaks into wet-cup Tighten wet-cup just enough to stop leakage. Loose wet-cup
Throat packings wom or damaged
Replace displacement rod. See page 26. Displacement rod wom
or
damaged
Replace packings. See page 26.
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Spitting from gun Air in fluid pump or hose Check for loose connections at pump intake and
tighten. Them prime the pump.
suction tube assembiy
See Startup, page 13.
Clear tip clog. See page 15.
Refill and prime the pump. See Startup, page 13.
Check fluid supply often to prevent running the
Pump dry.
flushing remove and clean the suction tube as-
Remove and clean suction tube. During normal
sembly separately to prevent further clogging.
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