Troubleshooting
Troubleshooting
Relieve the pressure (page 10) before checking or servicing the equipment.
Check all possible problems and causes before disassembling the pump.
Problem | Cause | Solution | |
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Pump cycles at stall or fails to hold | Worn check valve balls (26), seats | Replace. See page 20. | |
pressure at stall. | (31), or ball guides (32). |
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Pump will not cycle, or cycles once | Stuck or dirty air valve. | Disassemble and clean air valve. See | |
and stops. |
| page 16. Use filtered air. | |
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| Check valve ball (26) severely worn | Replace ball and seat. See page 20. | |
| and wedged in seat (31). |
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| Check valve ball (26) wedged in seat | Replace. See page 20. Do not | |
| (31) due to overpressurization. | exceed the maximum fluid working | |
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| pressure, see page 24. | |
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| Clogged fluid dispensing valve. | Relieve pressure and clear valve. | |
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| Pinched hose line. | Check lines. | |
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Pump operates erratically. | Clogged suction line. | Inspect; clear. | |
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| Sticky or leaking check valves. | Clean or replace balls (26) and seats | |
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| (31). See page 20. | |
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| Ruptured diaphragm (9). | Replace. See page 13. | |
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| Restricted exhaust. | Remove restriction. | |
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Air bubbles in fluid. | Loose suction line. | Tighten. | |
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| Ruptured diaphragm (9). | Replace. See page 13. | |
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Pump running irregularly. Stroke fre- | Worn parts. | Replace worn parts. Check com- | |
quency dropping, coming to stand- |
| pressed air supply. | |
still. |
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Icing caused by: compressed air too | Remove ice by changing operating | ||
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| moist, stroke frequency too high, | conditions. | |
| local temperature too low. |
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Air escapes continually. | Damaged air valve cup (15) or seat. | Replace damaged parts. See page | |
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| 16. | |
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| Foreign matter inside pump. | Check air filter. | |
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Pump does not start, or pressure | Worn check valve seats. | Replace. See page 20. | |
fluctuates. |
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Inlet strainer blocked, maximum suc- | Clean strainer. Replace defective | ||
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| tion exceeded, hose or seal defec- | parts. | |
| tive. |
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| Contaminated fluid. Pump installed or | Check fluid supply. Follow installa- | |
| operated incorrectly. | tion and operation instructions in this | |
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| manual. | |
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12 | 311688D |
