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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 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 / 6/5 hp - | |
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| 248944 / 9.0 hp - 248945 | |
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Gas engine operates, but displacement pump | Hydraulic pump valve is OFF | Set hydraulic pump valve ON | |
doesn't operate |
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Pressure setting too low | Increase pressure, page 23 | ||
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| Displacement pump outlet filter (if used) is dirty | Clean the filter | |
| 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*. See page 19 | |
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| Belt worn or broken or off | Replace. See manual 311797 | |
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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. Turn | |
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| engine OFF. Pry rod up or down until hydraulic | |
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| motor shifts. Manual 311797 | |
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Displacement pump operates, but output is low | Piston ball check not seating properly | Service piston ball check. See manual 311845 | |
on upstroke |
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Piston packings worn or damaged | Replace packings. See manual 311845 | ||
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Displacement pump operates but output is low | Piston packings worn or damaged | Tighten packing nut or replace packings. | |
on downstroke and/or on both strokes |
| See manual 311845 | |
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| Intake valve ball check not seating properly | Service intake valve ball check. See manual | |
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| 311845 | |
| 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 motor | Piston rod seal worn or damaged | Replace these parts. See manual 311797 | |
piston rod wiper |
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Fluid delivery is low | Pressure setting too low | Increase pressure, page 23 | |
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| Displacement pump outlet filter (if used) is dirty | Clean filter | |
| 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 builup on hydraulic components | Clean | |
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| Oil level is low | Fill with oil. See page 19 | |
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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*. See page 19 | |
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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. Reset | |
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| 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, page 19. | |||
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30 | 311791C |
