Troubleshooting
WARNING
To reduce the risk of serious injury whenever you are instructed to relieve pressure, always follow the Pressure Relief Procedure on page 8.
1.Relieve the pressure.
2.Check all possible problems and solutions before disassembling pump.
Problem | Cause | Solution |
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Pump fails to operate. | Restricted line or inadequate air | Clear; increase air supply. |
| supply. |
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| Insufficient air pressure; closed or | Open; clean (be sure to use air fil- |
| clogged air valves, etc. | ter). |
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| Exhausted fluid supply. | Refill; purge all air from pump and |
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| fluid lines. |
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| Damaged air motor. | Service air motor. See manual |
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| 307±043. |
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| Dried fluid seizure of displacement | Clean, check or replace throat pack- |
| rod. | ings. See manual 306±981. |
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| Always stop pump at bottom of |
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| stroke and keep |
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| compatible solvent. |
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Pump operates but output is low on | Restricted line or inadequate air | Clear; increase air supply. |
both strokes. | supply. |
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| Insufficient air pressure; closed or | Open; clean (be sure to use air |
| clogged air valves, etc. | filter). |
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| Clogged fluid line, valves, etc. | Clear* (be sure to use fluid filter). |
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| Packing nut is too tight. | Loosen (see page 8). |
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Pump operates but output is low on | Held open or worn intake valve. | Clear; service. See manual |
downstroke. |
| 306±981. |
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Pump operates but output is low on | Held open or worn fluid piston valve | Clear; service. See manual |
upstroke. | or packings. | 306±981. |
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Erratic or accelerated operation. | Exhausted fluid supply. | Refill; purge all air from pump and |
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| fluid lines. |
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| Held open or worn intake valve. | Clear; service. See manual |
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| 306±981. |
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*To determine if the fluid hose or gun is obstructed, relieve the pressure and disconnect the fluid hose, and place a container at the pump fluid outlet to catch any fluid. Turn on the air just enough to start the pump; about 1.4 to 2.8 bar (0.14 to 0.28 MPa, 20 to 40 psi). If the pump starts when the air is turned on, the obstruction is in the fluid hose or gun.
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