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Excessive fluid
Failure or lack of antisiphon valve
Excessive stroke rate
Improper stroke length
Inspect or add anti-siphon valve. This is
caused when system is in a vacuum condition
or valve in delivery applications with flooded
suction which feeds systems at very low
pressures.
Lower the stroke rate if adjustable on your
pump.
Reduce stroke length.
Pump will not pump
System pressure too high
Diaphragm improperly installed
Check valves worn or clogged
Check system pressure to assure that it
is within system rated parameters of the
pressure.
Make sure that diaphragm is screwed fully
unto shaft.
Clean or replace as required.
Pump will not run not
plugged in
Pump not turned on or not plugged in
Electronic failure
Check outlet with meter to assure that correct
or voltage is present and that power supply
cord is in good condition and plugged in.
Consult dealer or factory.
Excessive noise
Pump not primed
No output pressure
Prime pump.
Add an anti-siphon valve to provide 25 PSI
restriction on pump discharge.