Operating manual for centrifugal pumps AT - TB… - MC… - TC… - TMA
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If the magnetic driven pump is fitted with a temperature sensor, the temperature in the area of the magnetic coupling
should be approximately 3 to 5°C above the temperature of the product being pumped in standard conditions (water at
ambient temperature). Higher values could indicate operation at low flow, obstruction of internal flushing connections or
mechanical damage of the magnetic coupling.
Please contact POMPETRAVAINI if there are doubts regarding abnormal temperature rises.
13 - LUBRICATION INSTRUCTIONS
Pumps often operate in severe conditions and the bearings are subject to relevant radial and axial forces.
For a good pump operation it is therefore very important to keep the pump bearings well lubricated and clean.
Rolling bearings basic rated life is minimum 17500 hours, when operated within the allowable working condition. Higher
values can be reached with special designed bearings.
DANGER!
Danger due to collision, crushing or harm. Wait for the complete pump stopping before handling the unit. If the
pump still contains some fluid it may suddenly start to rotate once again. Take precautionary measures by
draining the pump or closing the pipes by mean of a valve. Possible contact with high temperature surfaces,
wait for the pump cooling. Maintenance must be absolutely carried out when the pump is at a standstill,
disconnecting the power supply and any other connection. Please make sure that the power supply is restored
only by the operator making the maintenance. It is necessary the presence of at least two operators and a
foreman must be aware there is a maintenance in progress. Operate only provided with apposite protective
devices.
FOLLOW THE SAFETY STANDARDS LISTED IN CHAPTER 2.
Bearings and lubricants must be free of any foreign particles such as dirt, dust, etc. which could cause the bearings to
seize.
See “Disassembly and assembly instructions” for bearing sizes, quantity and type of lubricants.
13.1 - GREASE LUBRICATED BALL BEARINGS
TMA pumps series, flanges size 40 and 50, have ball bearings that, during assembly, are already lubricated with high
quality grease with working temperature limits -30 °C +140°C.
The bearings used in a pump normal operating conditions must be carefully cleaned and newly greased after
approximately 2000/2500 working hours using a good lubricating grease quality (check the “Disassembly & assembly
instructions” for the lubricating grease replacement).
Dispose the exhausted grease following the current regulations and the right measures to protect the
environment.
The sealed pre-greased never need lubrication, but must anyway controlled after 2000/2500 working hours.
It is important to remember not to over lubricate the bearings, excessive grease will lead to overheating of bearings.
AT - TBH - TBA - TCK - TBK - TBAK pump series are fitted with self lubricated ball bearings which do not require re-
grease in normal operating conditions (series TCK, TBK e TBAK may also be fitted with oil lubrication as described in the
paragraph listed below).
It is necessary to carry out the greasing and maintenance operations as per the above description for the pumps with
roller bearing fitted on the drive end.
Bearing temperature should not exceed 85°C in normal conditions and ambient temperatures.
Overheating could be caused by excessive grease, coupling misalignment, excessive vibrations and /or bearing wear
(see chapter 16).
13.2 - OIL LUBRICATED BALL BEARINGS
Pump series TC... - MC... are fitted with oil lubricated ball bearings. The series TCK – TBK and TBAK can also be with
grease lubricated bearings.
It is good practice to replace the lubricating oil used at time of testing.
Oil should also be changed after the first 50 to 100 hours of operation.
Dispose the exhausted oil following the current regulations and the right measures to protect the environment.
The lubricating oil, poured through the hole which is also the dipstick seat or vent plug located at the top of the bearing
frame should, as a maximum, cover the bearing balls of the lower crown (the oil dipstick or the oil level gauge show the
correct quantity, see fig. 25).
The installation of a constant level oil-filler (as option) consents a correct lubricating oil level in the avoiding recurrent
fillings.
