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.
c
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 “5.5 Maintenance checklist.”
For this purpose, it is recommended to keep an operation log.
d
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 near
the bearing and the atmosphere does not exceed 40°C.
e
Since shielded grease filled bearings are used, there is hardly any need for maintenance of the
bearings such as refilling of grease. Replace the bearings if they generate unusual noise or
vibration.
* Long-life urea grease is used as lubricating grease in bearings. Use bearings into which urea
grease is filled. Using other type of grease such as lithium grease may shorten the service life.
f
Since mechanical seal is used as the shaft seal, high-frequency sound (mechanical squeak) may
occasionally be generated, but it is not a pump failure. You can continue to use the pump with the
same good quality.
g
Normally, when mechanical seal is used as the shaft seal, liquid leakage hardly occurs. If the
liquid leakage becomes frequent, replace the seal. (During the initial period of running a new
pump, a small amount of leak may occur, but it is not a pump failure. The leak should stop in
several hours of operation.) For details, refer to “5.2 Mechanical seal.”
h
Check the piping for any water leakage or damage.
i
Check that all mounting bolts and the power terminal block are securely connected.
j
Except when inspection is required, keep the cocks of the pressure gauges and compound
gauge closed all the time with the pressure being released
k
In the event of a power failure, be sure to turn off the power. The pump suddenly starts up on
restoration of the power, and it is dangerous.
Warning
In the event of a power failure, be sure to turn off the power switch.
The pump may suddenly start up on restoration of the power, which leads to a
danger.
l
Check the strainer fitted on the pump suction side, for any clogging. Clean it if it is clogged.
Caution
For overhaul, replacement of parts, or repairs, ask the vendor, the service center
specified by Teral, or your nearest Teral sales office. Incorrect work may cause a
failure or accident.
