Instruction manual CTV vertical pumps
11
3. MAINTENANCE
Maintenance work on electrical installations must be performed by qualified
personnel and only when the power supply has been shutoff. Follow the local
and national safety regulations.
3.1
Maintenance schedule
The CTV range pumps generally do not require any maintenance. However depending on the
application, it may be necessary to once in a while clean the internals of the pump to optimize the
performance.
3.2
Trouble shooting
Problem
Possible fault
Measure to take
Failure to deliver
Liquid level too low
Motor speed too low
Impeller clogged
Wrong direction of rotation
NPSHa too low
See MIN start level chapter 1.5
Check the motor and motor connection
Clean the pump
See chapter 1.7 for change of direction
Consult us
Insufficient capacity
Head higher than expected
Impeller or discharge clogged
Impeller damaged
Wrong direction of rotation
Check piping system
Clean the pump internally
Change impeller
See chapter 1.7 for change of direction
Insufficient head
Air in the casing or discharge
Motor speed too low
Impeller damaged
Impeller diameter too small
Check system for air pockets
Check the motor and motor connection
Change impeller
Consult us for eventual change
Irregular flow
Liquid level too low
Suction or strainer clogged
See MIN liquid level chapter 1.5
Check and clean
Electric current too high
(motor protection shut)
Specific gravity higher than expected
Viscosity higher than expected
Head lower than expected
Motor bearings worn
Increase the head with flow control valve
Consult us
Increase the head with flow control valve
Change bearings, check vapour seal
Pump vibrates
Pump insufficiently fastened
Impeller damaged or clogged
Motor bearings worn
Liquid level too low
Check the pump mounting bolts
Check and clean or replace impeller
Change bearings, check vapour seal
See MIN liquid level chapter 1.5