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| Troubleshooting | |
| Troubleshooting |
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PROBLEM | CAUSE | SOLUTION | |
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Gas engine pulls hard (won't start) | Hydraulic pressure is too high | Turn hydraulic pressure knob | |
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| counterclockwise to lowest setting | |
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Gas engine does not start | Switch OFF, low oil, no gasoline | Consult engine manual, supplied | |
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Gas engine doesn't work properly | Faulty engine | Consult engine manual, supplied | |
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Gas engine operates, but | Pump valve is OFF | Set pump valve ON | |
displacement pump doesn't operate |
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Pressure setting too low | Increase pressure, page 12 | ||
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| Displacement pump outlet filter | Clean the filter | |
| (if used) is dirty or clogged |
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| Tip or tip filter (if used) is clogged | Remove tip and/or filter and clean | |
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| Hydraulic fluid too low | Shut off sprayer. Add fluid* | |
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| Belt worn, broken or off | Replace. See manual 311283 | |
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| Hydraulic pump worn or damaged | Bring sprayer to Graco distributor for | |
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| repair | |
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| Dried paint seized paint pump rod | Service pump. See manual 311485 | |
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| Hydraulic motor not shifting | Set pump valve OFF. Turn pressure | |
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| down. Turn engine OFF. Pry rod up or | |
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| down until hydraulic motor shifts. | |
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| Manual 311283 | |
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Displacement pump operates, but | Piston ball check not seating properly | Service piston ball check. | |
output is low on upstroke |
| See manual 311485 | |
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| Piston packings worn or damaged | Replace packings. See manual | |
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| 311485 | |
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Displacement pump operates but | Piston packings worn or damaged | Tighten packing nut or replace | |
output is low on downstroke and/or |
| packings. See manual 311485 | |
on both strokes |
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Intake valve ball check not seating | Service intake valve ball check. | ||
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| properly | See manual 311485 | |
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| Suction tube air leak |
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Paint leaks and runs over side of | Loose | Tighten | |
wetcup |
| leakage | |
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| Throat packings worn or damaged | Replace packings. | |
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| See manual 311485 | |
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Excessive leakage around hydraulic | Piston rod seal worn or damaged | Replace these parts. | |
motor piston rod wiper |
| See manual 311283 | |
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Fluid delivery is low | Pressure setting too low | Increase pressure, page 4 | |
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| Displacement pump outlet filter (if | Clean filter | |
| used) is dirty or clogged |
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| Intake line to pump inlet is not tight | Tighten | |
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| Hydraulic motor is worn or damaged | Bring sprayer to Graco distributor | |
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| for repair | |
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| Large pressure drop in fluid hose | Use larger diameter or shorter hose | |
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311279D | 29 |
