Air-Operated Diaphragm Pump
Repair or Replace Air Valve - Double Diaphragm Pump
Repair or Replace Air Valve - Double Diaphragm Pump
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Problem Cause Solution<br />
Exhaust air contains fluid being <strong>Diaphragm</strong> (and backup) ruptured. Replace. See page 12.<br />
pumped.<br />
Loose diaphragm shaft bolt. Tighten or replace. See page 12.<br />
<strong>Diaphragm</strong> shaft bolt o-ring damaged.<br />
Replace o-ring. See page 12.<br />
Moisture in exhaust air. High inlet air humidity. Use drier air supply.<br />
<strong>Pump</strong> exhausts excessive air at stall. Worn air valve cup or plate. Replace cup and plate. See page 9.<br />
Damaged air valve gasket. Replace gasket. See page 8.<br />
Damaged pilot valve. Replace pilot valves. See page 12.<br />
Worn shaft seals or bearings. Replace shaft seals or bearings. See<br />
page 12.<br />
<strong>Pump</strong> leaks air externally. <strong>Air</strong> valve or fluid cover screws loose. Tighten.<br />
<strong>Diaphragm</strong> damaged. Replace diaphragm. See page 12.<br />
<strong>Air</strong> valve gasket damaged. Replace gasket. See page 8.<br />
<strong>Pump</strong> leaks fluid externally from<br />
joints.<br />
<strong>Pump</strong> leaks fluid externally through<br />
manifold or fluid cover.<br />
Loose manifold screws or fluid cover<br />
screws.<br />
Tighten manifold screws or fluid<br />
cover screws. See page 15.<br />
Manifold o-rings worn out. Replace o-rings. See page 11.<br />
Excessive pump speed or inlet<br />
starvation.<br />
Replace manifold and reduce pump<br />
speed or improve pump feed.<br />
859.0089 7
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