Troubleshooting - Watson-Marlow MasoSine EC 25 Manual

19 Troubleshooting

Error
Pump does not draw in
Pump does not deliver
Pump is noisy
Pump leaking at leakage
hole
Pump is noisy
Pump leaking at the front
housing
Pump has blocked
Strong wear after short
operating time
Rotor has wear on one
side
Pump not clean after CIP
cleaning
Rotor has seized on
stator
Revision 4.4 / November 2010
Cause
Direction of rotation not correct
No wetting liquid in the pump
Screw fastening not tight
Suction pipe too long
Pipe cross-section too narrow
Seals leaking
Wear in the pump
Motor speed not correct
Direction of rotation not correct
Suction pipe is leaking
Motor speed not correct
Wearing parts worn
Inserted closed gate valve
Noises come from the drive / pump
Suction pipe too small (cavitation)
Knocking noises from the pump head Scrapergate wear
Noises from bearing housing
Coupling not aligned
Seal system leaking
O-ring seal leaking
Lip seals on the bearing block
leaking, oil escapes
O-rings in the Liner not or wrongly
installed
Foreign body in the pump
Power supply interrupted
Defect on the drive
Solids in the pumped material
Pumped material is abrasive
Rotor not tightened correctly on
installation
Adjusting dimensions changed after
working on the bearing housing
Cleaning regulation not complied with Choke on the pressure side
Rotor not correctly tightened
Temperature too high
(thermal expansion)
Remedy
Check direction of rotation
Fill pump with liquid
Check screw fastening
Adapt suction pipe
Adapt suction pipe
Check all seals for damage
Change wearing parts
Measure, regulate speed
Check direction of rotation
Check pipe system
Check speed based on output
diagrams
Replace wearing parts
Check pipe system
Consult
Watson-Marlow MasoSine
Shorten suction pipe or increase
diameter, reduce speed
Fill oil, change tapered roller
bearings
Align coupling with hairline
Change Mechanical or Lip seal
system
Replace O-ring
Dismantle bearing block,
replace radial shaft sealing rings
Install housing O-ring correctly or
replace
Remove foreign body, examine
pump for damage
Check electrical installations
(fuses, drive)
(Separate the coupling and turn
the pump by hand)
Frequent change of the wearing
parts, change material pairing
Choose larger pump,
reduce speed
Tighten closing nut firmly on block
Check and correct the adjusting
dimensions (see page 12)
Check differential pressure 3-4 bar
Tighten closing nut firmly on block
Choose Liner with larger
tolerances
14