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| Troubleshooting |
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| WHAT TO CHECK |
| WHAT TO DO |
TYPE OF PROBLEM | If check is OK, go to next check | When check is not OK, refer to this column | ||
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Pump output is low | 14. | 14. | Replace | |
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| aged |
| or 310894. |
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| 15. | Intake valve ball is packed with | 15. | Clean intake valve; see pump manual |
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| material |
| 310643 or 310894. |
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| 16. | Pressure setting is too low | 16. | Increase pressure; see pump manual |
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| 310643 or 310894. |
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| 17. | Large pressure drop in hose with | 17. | Use larger diameter hose and/or reduce |
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| heavy materials |
| overall length of hose. Use of more than |
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| 100 ft of 1/4 in. hose significantly reduces |
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| performance of sprayer. Use 3/8 in. hose |
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| for optimum performance (50 ft minimum). |
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Motor runs but pump does | 1. | Displacement pump pin (32) | 1. | Replace pump pin if missing. Be sure |
not stroke |
| damaged or missing; see pump |
| retainer spring (31) is fully in groove all |
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| manual 310643 or 310894. |
| around connecting rod; see pump manual |
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| 310643 or 310894. |
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| 2. | Connecting rod assembly (43) | 2. | Replace connecting rod assembly; see |
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| damaged; see pump manual |
| pump manual 310643 or 310894. |
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| 310643 or 310894. |
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| 3. | Gears or drive housing damaged, | 3. | Inspect drive housing assembly and gears |
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| page 30. |
| for damage and replace if necessary; see |
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| pump manual 310643 or 310894. |
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Excessive paint leakage into | 1. | Throat packing nut is loose | 1. | Remove throat packing nut spacer. |
throat packing nut |
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| Tighten throat packing nut just enough to |
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| stop leakage. |
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| 2. | Throat packings are worn or | 2. | Replace packings; see pump manual |
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| damaged |
| 310643 or 310894. |
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| 3. | Displacement rod is worn or | 3. | Replace rod; see pump manual 310643 or |
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| damaged |
| 310894. |
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Fluid is spitting from gun | 1. | Air in pump or hose | 1. | 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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| 2. | Tip is partially clogged | 2. | Clear tip; see tip guard manual 309640. |
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| 3. | Fluid supply is low or empty | 3. | Refill fluid supply. Prime pump; see pump |
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| manual 310643 or 310894. Check fluid |
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| supply often to prevent running pump dry. |
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Pump is difficult to prime | 1. | Air in pump or hose | 1. | 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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| 2. | Intake valve is leaking | 2. | 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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| 3. | Pump packings are worn | 3. | Replace pump packings; see pump man- |
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| ual 310643 or 310894. |
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| 4. | Paint is too thick | 4. | Thin the paint according to the supplier’s |
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| recommendations. |
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No display, sprayer operates | 1. | Display is damaged or has bad | 1. | Check connections. Replace display. |
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| connection |
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12 | 311365G |
