14 308981
Troubleshooting
Read Pressure Relief Procedure on page 11, and relieve the pressure before you check or service the
equipment. Check all possible problems and causes before disassembling the pump.
PROBLEM CAUSE SOLUTION
Pump will not cycle, or cycles once and
stops.
Air valve is stuck or dirty. Use filtered air.
Pump cycles at stall or fails to hold
pressure at stall.
Leaky check valves or o-rings. Replace.
Worn check balls or duckbill valves or
guides.
Replace.
Check ball wedged in guide. Repair or replace.
Worn diaphragm shaft seals. Replace.
Pump operates erratically. Clogged suction line. Inspect; clear.
Sticky or leaking check valve balls. Clean or replace.
Diaphragm ruptured. Replace.
Air bubbles in fluid. Suction line is loose. Tighten.
Diaphragm ruptured. Replace.
Loose manifolds or damaged manifold
o-rings.
Tighten manifold bolts or nuts; replace
o-rings.
Loose fluid side diaphragm plates. Tighten.
Fluid in exhaust air. Diaphragm ruptured. Replace.
Loose fluid side diaphragm plates. Tighten.
Worn diaphragm shaft seals. Replace.
Pump exhausts air from clamps (metal
pumps).
Loose clamps. Tighten clamp nuts.
Air valve o-ring is damaged. Inspect; replace.
Pump leaks fluid from check valves. Worn or damaged check valve o-rings. Inspect; replace.
Reed switch electrical signal output
erratic or inconsistent
Switch moved Re-install reed switch. See page 10.
Running speed of pump less than reed
switch calibration speed.
Reset reed switch calibration with pump
running at or below minimum operation
speed. See page 10.
Slow changeover or pump inlet pressure
too low.
Increase pump inlet pressure to a
minimum of 40 psi.
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