Troubleshooting
WARNING
To reduce the risk of serious injury whenever you are instructed to relieve pressure, always follow the Pressure Relief Procedure on page 12.
1.Relieve the pressure before checking or servicing the equipment.
2.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 (301), seats | Replace. See page 18. |
pressure at stall. | (201) or |
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Pump will not cycle, or cycles once | Air valve is stuck or dirty. | Disassemble and clean air valve. |
and stops. |
| See pages |
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| Check valve ball (301) severely | Replace ball and seat. See page |
| worn and wedged in seat (201) or | 18. |
| manifold (102 or 103). |
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| Check valve ball (301) is wedged | Install Pressure Relief Valve |
| into seat (201), due to overpressur- | (see page 10). |
| ization. |
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| Dispensing valve clogged. | Relieve pressure and clear valve. |
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Pump operates erratically. | Clogged suction line. | Inspect; clear. |
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| Sticky or leaking balls (301). | Clean or replace. See page 18. |
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| Diaphragm ruptured. | Replace. See pages |
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| Restricted exhaust. | Remove restriction. |
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Air bubbles in fluid. | Suction line is loose. | Tighten. |
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| Diaphragm ruptured. | Replace. See pages |
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| Loose inlet manifold (102), dam- | Tighten manifold bolts (112) or re- |
| aged seal between manifold and | place seats (201) or |
| seat (201), damaged | See page 18. |
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| Loose fluid side diaphragm plate | Tighten or replace. See pages |
| (105). | |
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