18
Troubleshooting
Fault
Cause
Fix
Pump does not draw in
Direction of rotation not correct
Check direction of rotation
No wetting liquid in pump
Fill pump with liquid
Screw fastening not tight
Check screw fastening
Suction pipe too long
Adapt suction pipe
Suction pipe too narrow
Adapt suction pipe
Shaft seal leaking
Check all seals for damage
Wearing parts worn
Replace wearing parts
Motor speed not correct
Measure and regulate speed
Pump does not deliver
Direction of rotation not correct
Check direction of rotation
Suction and pressure pipe
interchanged
Check pipe system
Motor speed not correct
Check pump speed against performance curves - see your
purchase order
Wearing parts worn
Replace wearing parts
Inserted gate valve closed
Check pipe system
Pump is noisy
Noises from the drive
Consult manufacturer
Noises from the pump
Consult manufacturer
Suction pipe too small (cavitation)
Shorten suction pipe or increase diameter, reduce speed
Knocking noises from the
pumphead
Check if gate is worn and replace if necessary
Cavitation. Refer to See Cavitation on page 17
Noises from the power frame
Fill oil, change tapered roller bearings
Coupling not aligned
Align coupling correctly. See section See Good pump installation
practice on page 15
Pump leaks
Sealing system is leaking
Change static/dynamic seal faces
O-ring seal leaking
Replace O-ring
Lip seal ring on the power frame
leaking, oil escapes
Dismantle power frame, replace lip seals
Seal faces are worn / show burning
marks
Use a seal flush to prevent mechanical seal from dry run
Pump leaks at front
housing or back
housing
Housing seal not installed or
wrongly installed
Install housing O-ring correctly or replace
Housing seal defective
Install housing O-ring correctly or replace
Pump is blocked
Foreign body in the pump
Remove foreign body, examine pump for damage
Power supply interrupted
Check electrical installation and fuses, check drive
Defect in the drive
Separate the coupling and turn the pump by hand to confirm
Severe wear after
short operating time
Solids in the pumped fluid
Change the wearing parts frequently; check material
compatibility
Pumped fluid is abrasive
Choose larger pump, reduce speed
Rotor has wear on
one side
Rotor not tightened correctly on
installation
Tighten shaft nut firmly on block
Adjusting dimensions changed
after working on the bearing
housing
Check and correct dimension X: see section See Assembling the
support / Centering the rotor with the shim ring on page 32
Pump not clean after
CIP cleaning
Cleaning regulation not complied
with.
See section See Cleaning and sterilisation on page 22
Pump assembly
subject to vibrations
Speed of the drive motor is too high
Reduce the speed of the drive motor
Smells and smoke
coming from the pump
Pump is running dry
Stop the pump immediately. Check inner parts for damage and
replace if necessary
18.1 Rework of front and back cover
In some cases it might be necessary to rework the front cover and/or back cover of the pump to smooth
out deeper scratches (e.g. surface damage caused by a foreign body). Please contact the MasoSine
factory or your local supplier if you require refurbishment. MasoSine can provide you with the necessary
data to do a proper refurbishment.
18.2 Technical support
For full contact details, please go to our website:
http://www.watson-marlow.com/gb-en/range/masosine/
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