4.5 Recommended spare parts
In order to face normal service problems and to avoid possible waste of time, we suggest to keep
in stock a small supply of the following spares:
One membrane
Two sets of plunger packing
One suction valve complete
One discharge valve complete
When ordering spares, please indicate always the model and the serial number of the pump
The check valve is damaged or
polluted by fluid
Clean or replace new check valve
The chemical level in the tank is
too low
The discharge tube is jammed
Clean and dredge the tube
Disconnect motor from
power supply
The power supply cable
is disconnected
Find the disconnected part and repair
Position the knob at “zero” flow
rate
The voltage is not stable, burning
the motor
Measure and rectify the voltage, repair or
replace new motor
The chamber and tube remain
gas
The suction line is jammed
The suction head is too high
Relocate the pump to reduce suction head
The fluid temperature is too high
The fluid viscosity is too high
Reduce the viscosity( through heating or
dilution)
The check valve is too dirty
or damaged
Clean or replace check valve
The suction line is incorrectly si
zed
Check the length and diameter of suction line
The stroke length is wrongly
regulated
Check and readjust stroke length
The speed of pump is abnormal
Choose power supply and frequency that
corresponds to that of motor label
Excessively
big flow rate
The discharge pressure is lower
than suction pressure
Install back pressure valve
Check and adjust stroke length
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