5-1
5. Maintenance and inspection
Warning
Before checking the pump, be sure to turn off the main power. The pump
may suddenly start up in automatic mode or on other occasions and lead to a
great danger.
Warning
Before starting the unit or carrying out maintenance/inspection work, ensure
that all the relevant workers are informed of the operation and that there are
no workers in the dangerous zone.
5.1
Precautions for maintenance and inspection
(1) Observe the following instructions, in particular, during daily inspection.
A large deviation in the pump's discharge pressure, electric current, vibration, noise, or other
conditions from the normal status is a sign of an imminent failure. Therefore, immediately take
measures, referring to the Maintenance checklist in Section “5.4 Maintenance checklist.”
For this purpose, it is recommended to keep an operation log.
If the bearing temperature gets abnormally high, immediately stop the pump and check the
bearing. The temperature is normal if the temperature difference between the motor surface
and the bearing case surface near the bearing and the atmosphere does not exceed 40°C.
Replace the bearings if they generate unusual noise or vibration.
* For MTP/MTP-e: Long-life urea grease or lithium grease is used as lubricating grease in
bearings. Use the bearings into which the same type of grease is filled. When you replace a
bearing, it is recommended to select a bearing equivalent to the following.
Model
Type of Grease
Bearing (Grease brand)
MTP(0.4kW)
Lithium-base
(MULTEMP SRL grease)
MTP(0.75, 1.5kW)
MTP-e (0.75kW)
Urea-base
Bearings by NSK (EA2 grease)
Bearings by NACHI (FNS3D grease)
MTP-e (1.5kW and over)
Urea-base
Bearings by NSK (ENS grease)
MTP (2.2kW and over)
Urea-base
-
Some models of MSP/MSP-e (for 5 stages and over with 40-65 diameter and 4 stages and
over with 80 diameters) require periodical grease replenishment. Refer to “5.3 Bearings” for
details.
If mechanical seal is used as a shaft seal, high-frequency sound (mechanical squeak) may be
generated occasionally, but it is not a pump failure. You can continue to use the pump with the
same good quality.
Normally, if mechanical seal is used as a shaft seal, liquid leakage hardly occurs. If liquid
leakage becomes frequent, replace the seal. (At the time of initial period of operation, a small
amount of leak may occur, but it is not a pump failure. The leak should stop in several
overheat of operation.) For details, refer to “5.2.2 Mechanical seal.”
If gland packing is used as a shaft seal, check that the gland packing housing does not
generate heat abnormally. If the drip rate is too small, it might generate heat abnormally.
Even after tightening the nut of the packing retainer, the drip rate cannot be adjusted, replace
the gland packing or both the gland packing and the main shaft. Refer to “5.2.1 Gland
packing” for details.
Check the piping for any water leakage or damage.
Caution
For overhaul, replacement of parts, or repairs, ask the vendor, the servicing
company specified by Teral, or your nearest Teral sales office. Incorrect
work may cause a failure or accident.
