Troubleshooting
Troubleshooting
PROBLEM | CAUSE | SOLUTION |
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Gas engine pulls hard (won't start) | Hydraulic pressure is too high | Turn hydraulic pressure knob counter |
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| clockwise 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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| Elevation | Refer to Engine Repair Kit. |
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| 4.0 hp - 288678 / 5.5 hp - 248943 / |
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| 6/5 hp - 248944 / 9.0 hp - 248945 |
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Gas engine operates, but displacement | Hydraulic pump valve is OFF | Set hydraulic pump valve ON. |
pump doesn't operate |
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Pressure setting too low | Increase pressure. | |
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| Displacement pump outlet filter (if used) | Clean the filter. |
| 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 or broken or off | Replace, page 12. |
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| Hydraulic pump worn or damaged | Bring sprayer to Graco distributor for repair. |
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| Dried paint seized paint pump rod | Service pump. See manual 311845. |
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| Hydraulic motor not shifting | Set pump valve OFF. Turn pressure down. |
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| Turn engine OFF. Pry rod up or down until |
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| hydraulic motor shifts . |
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Displacement pump operates, but output | Piston ball check not seating properly | Service piston ball check. See manual |
is low on upstroke |
| 311845. |
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| Piston packings worn or damaged | Replace packings. See manual 311845. |
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Displacement pump operates but output | Piston packings worn or damaged | Tighten packing nut or replace packings. |
is low on downstroke and/or on both |
| See manual 311845. |
strokes |
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Intake valve ball check not seating | Service intake valve ball check. See man- | |
| properly | ual 311845. |
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| Suction tube air leak |
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Paint leaks and runs over side of wetcup | Loosen | Tighten |
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| Throat packings worn or damaged | Replace packings. See manual 311845. |
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Excessive leakage around hydraulic | Piston rod seal worn or damaged | Replace these parts. |
motor piston rod wiper |
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Fluid delivery is low | Pressure setting too low | Increase pressure. |
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| Displacement pump outlet filter (if used) | Clean filter. |
| 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 for repair. |
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| Large pressure drop in fluid hose | Use larger diameter or shorter hose. |
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The sprayer overheats | Paint buildup on hydraulic components | Clean. |
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Spitting from gun | Air in fluid pump or hose | Check for loose connections on siphon |
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| assembly, tighten, then reprime pump. |
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| Loose intake suction | Tighten. |
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| Fluid supply is low or empty | Refill supply container. |
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Excessive hydraulic pump noise | Low hydraulic fluid level | Turn sprayer OFF. Add fluid*. |
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Electric motor does not operate | Power switch is not ON | Turn power switch to ON. |
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| Tripped circuit breaker | Check circuit breaker at power source. |
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| Reset motor switch. |
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*Check hydraulic fluid level often. Do not allow it to become too low. Use only Graco approved hydraulic fluid.
8 | 311797J |
