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| Troubleshooting |
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Problem | Cause | Solution |
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Pump output is low | Strainer is clogged | Clean strainer. |
| Piston ball is not seating | Service piston ball. Manual 310643. |
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| Piston packings are worn or damaged | Replace packings. Manual 310643. |
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| Replace | |
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| Intake valve ball is not seating properly | Clean intake valve. Manual 310643. |
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| Intake valve ball is packed with material | Clean intake valve. Manual 310643. |
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| Engine speed is too low | Increase throttle setting. |
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| Clutch is worn or damaged | Adjust or replace clutch. Page 37. |
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| Pressure setting is too low | Increase pressure. |
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| Fluid filter, tip filter or tip is clogged or | Clean filter. Manual 311254. |
| dirty |
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| Large pressure drop in hose with heavy | Use larger diameter hose and/or reduce overall |
| materials | length of hose. Use of more than 100 ft of 1/4 |
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| in. hose significantly reduces performance of |
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| sprayer. Use 3/8 in. hose for optimum |
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| performance (50 ft minimum). |
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Excessive paint leakage into throat | Throat packing nut is loose | Remove throat packing nut spacer. Tighten |
packing nut |
| throat packing nut just enough to stop leakage. |
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| Throat packings are worn or damaged | Replace packings. Manual 310643. |
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| Displacement rod is worn or damaged | Replace rod. Manual 310643. |
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Fluid is spitting from gun | Air in pump or hose | Check and tighten all fluid connections. |
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| Reprime pump. |
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| Tip is partially clogged | Clear tip. Manual 309640. |
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| Fluid supply is low or empty | Refill fluid supply. Prime pump. Check fluid |
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| supply often to prevent running pump dry. |
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Pump is difficult to prime | Air in pump or hose | Check and tighten all fluid connections. |
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| Reduce engine speed and cycle pump as |
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| slowly as possible during priming. |
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| Intake valve is leaking | Clean intake valve. Be sure ball seat is not |
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| nicked or worn and that ball seats well. |
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| Reassemble valve. |
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| Pump packings are worn | Replace pump packings. Manual 310643. |
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| Paint is too thick | Thin the paint according to the supplier's |
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| recommendations |
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| Engine speed is too high | Decrease throttle setting before priming pump. |
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Clutch squeaks each time clutch | Clutch surfaces are not matched to | Clutch surfaces need to wear into each other. |
engages | each other when new and may cause | Noise will dissipate after a day of run time. |
| noise |
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High engine speed at no load | Misadjusted throttle setting | Reset throttle to 3300 engine rpm at no load. |
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| Worn engine governor | Replace or service engine governor |
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313313A | 25 |
