5-1
5. Maintenance and inspection
Warning
Before checking the pump, be sure to turn off the main power.
Failure to observe this may lead to a danger because the pump may
suddenly start in automatic operation or on other occasions.
Warning
Before operating, maintaining or checking the pump, 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) When carrying out a daily inspection, carefully observe the following points:
A large deviation in the pump's discharge pressure, current, vibration, noise, or other
conditions from the normal status is a sign of a failure. Therefore, take measures as soon as
possible, referring to the maintenance check list in Section "5.3 Periodic inspection" (page 5-3).
For this purpose, it is recommended to keep an operation log.
If the bearing temperature gets too high, immediately stop the pump and check the bearing.
The temperature is normal when the difference between the motor surface temperature and
the ambient temperature is not greater than 40°C.
Because shielded grease filled bearings are used, the bearings hardly require grease filling
and other maintenance work. Replace the bearings if unusual noise and vibration are
produced from them.
Bearing type
Model
Load side Non-load side
VKD111AA-e 6305 ZZ 6203 ZZ
VKD131AB-e,VKD141AC-e 6306 ZZ 6205 ZZ
VKD151AD-e,VKD131AF-e,VKD141AG-e,VKD151AH-e 6307 ZZ 6205 ZZ
* Since urea-based grease is applied for the purpose of a lifetime extension, use urea-based
grease filled bearings.
The bearing section is mounted with an oil seal to prevent the entry of the liquid. When
replacing the bearing, replace the oil seal with new one.
Oil seal type
Model
Load side Non-load side
VKD-e – all models SC 30 45 7 HM 25 38 5
If any oil seal or V-ring is used, high-frequency sound (rubber squeak) may occasionally be
generated. However, it is not a symptom of a pump failure. You can continue to use the pump
with the same good quality.
Keep the cocks of the pressure gauges and compound gauge closed at all times except when
inspection is required.
In the event of a power failure, be sure to turn off the power.
The pump suddenly starts on energization of the power, which leads to a danger.
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