Troubleshooting
WARNING
WARNING
To reduce the risk of serious injury whenever you are instructed to relieve pressure, always follow the Pressure Relief Procedure on page 8.
Relieve the Pressure before you check or service any system equipment.
Never operate the pump with the warning plate
(20)or the identification plate (40) removed. These plates protect your fingers from pinching or ampu- tation by moving parts in the air motor.
NOTE: Check all other possible problems and solu- tions before disassembling the pump.
Problem | Cause | Solution |
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Pump fails to operate | Low air supply pressure or restricted air | Increase air supply; clear* |
| lines |
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| Closed valves | Open |
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| Clogged fluid lines, hoses, valves, etc. | Clear* |
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| Damaged air motor | Service air motor |
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| Empty fluid supply container | Refill and reprime, or flush |
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Continuous air exhaust | Worn or damaged air motor gasket, | Service air motor |
| packing, seal, etc. |
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Erratic pump operation | Empty fluid supply container | Refill and reprime, or flush |
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| Held open or worn intake valve or | Clear; service |
| piston packings |
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Pump operates, but output is low | Held open or worn piston | Clear; service |
on the up stroke | or packings |
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Pump operates, but output is low | Held open or worn intake valve | Clear; service |
on the down stroke |
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Pump operates, but output is low | Low air supply pressure or | Increase air supply; clear* |
on both strokes | restricted air lines |
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| Closed valves | Open |
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| Empty fluid supply container | Refill and reprime, or flush |
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| Clogged fluid lines, hoses, valves, etc. | Clear* |
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| Packing nut too tight | Loosen |
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| Loose packing nut or worn packings | Tighten; replace |
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*Follow the Pressure Relief Procedure on page 8. Disconnect the fluid hose. If the pump starts when the air is turned on again, the hose or gun is clogged.
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