Troubleshooting
WARNING
To reduce the risk of serious injury whenever you are instructed to relieve pressure, always follow the Pressure Relief Procedure on page 9.
Before servicing this equipment always make sure to relieve the pressure.
Check all possible problems and solutions before disassembling the pump.
Problem | Cause | Solution |
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Pump fails to operate | Restricted line or inadequate air sup- | Clear; Increase air supply. |
| ply |
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| Insufficient air pressure; closed or | Open, clean. |
| clogged air valves, etc. |
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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 valving mechanism; | Service air motor (see manual |
| stalling | 306982 or 307043). |
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| Dried fluid seizure of displacement | Clean, check or replace throat pack- |
| rod (1) | ings (3, 25); always stop the pump at |
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| the bottom of its stroke and keep the |
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Pump operates, but output low on | Restricted line or inadequate air sup- | Clear; increase air supply. |
both strokes | ply |
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| Insufficient air pressure; closed or | Open, clean. |
| clogged air valves, etc. |
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| Exhausted fluid supply | Refill; purge all air from pump and |
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| fluid lines. |
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| Clogged fluid line, valves, etc. | Clear*. |
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| Packing nut (14) too tight | Loosen (see page 10). |
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| Loose packing nut (14) or worn throat | Tighten packing nut (see page 10); |
| packings (3, 25) | replace throat packings. |
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Pump operates, but output low on | Held open or worn intake valve. | Clear; service. |
down stroke |
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Pump operates, but output low on | Held open or worn fluid piston valve | Clear; service. |
up stroke | or packings (29, 30) |
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Erratic or accelerated operation | Exhausted fluid supply | Refill; purge all air from the pump and |
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| fluid lines. |
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| Help open or worn intake valve. | Clear; service. |
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| Help open or worn fluid piston valve | Clear; service. |
| or packings (29, 30) |
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*To determine if the fluid hose or gun is obstructed, relieve the pressure. 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