5-1
5. Maintenance and inspection
Warning
Before checking the pump, be sure to turn off the main power. Otherwise,
the pump may suddenly start up in automatic mode or on other occasions,
thus leading to 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.
Caution
For overhaul, replacement of parts, or repairs, ask the vendor or the service
center specified by Teral. Incorrect work may cause a failure or accident.
5.1 Precautions for maintenance and inspection
(1) Observe the following points, 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 a failure. Therefore, immediately take measures,
referring to the Maintenance checklist in Section “5.4. Periodic inspection [page 5-2].” 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 atmosphere does not exceed 40°C.
Because prelubricated shielded 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.
Bearing type
Model
Load side
Non-load side
VKN115A-e, VKP115A-e
6305ZZ
6203ZZ
* Urea grease is adopted for lubrication inside the bearings to extend their service life. Use
bearings into which urea grease is filled.
High-frequency sound (mechanical squeak) may occasionally be generated from the shaft
seal, but it is not a pump failure. You can continue to use the pump with the same good
quality.
Normally, liquid leakage hardly occurs at the mechanical seal of the shaft seal. If by any
chance the liquid leakage becomes frequent, replace the seal.
Keep the cocks of the pressure gauges and compound gauge closed all the time except when
inspection is required.
In the event of a power failure, be sure to turn off the power. The pump suddenly starts on
restoration of the power, thus leading to danger.
Warning
In the event of a power failure, be sure to turn off the power switch.
Otherwise, the pump may suddenly start up on restoration of the power,
thus leading to an injury.
(2) If you do not use the pump for a long time, observe the following points:
