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Trouble
(F)
Excessive pump flow
rate.
Flow continues after
pump has stopped.
(G)
Liquid leakage from
pump adaptor drain
(H)
Knocking
sound
gearbox
(I)
Liquid end noise
(J)
Overheating of motor
(K)
Overload
MP2500
Cause
Pressure difference across
pump less than 20 KPa
Discharge line too long or
diameter too small
Ruptured diaphragm.
in
Excessive discharge
pressure
Rhythmic noise of pump
valves
Clogged discharge or
suction valve
Improper voltage
Overload
Inadequate ventilation
Improper Oil
Discharge pressure too
high
Erratic noise of pump
valves
Updated January 2017
Correction
Increase pressure
difference (ie install back
pressure valve).
Reduce length and/or
increase diameter.
Install accumulator in
discharge line.
Check/replace diaphragm.
Check discharge pressure.
Normal
Clean
Adjust voltage to motor
specification.
(Refer to Section K).
Change motor or relocate
Change
Lower to permissible
pressure
1. Clean valves.
2. Increase pressure
difference (ie install
back pressure valve).
Page 12
Series 2500
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