Teral VKN-e Series, Инструкция по эксплуатации, Страница: 25 / 32

5-2
Caution
If you do not use the pump for a long time, turn off the power for safety.
Otherwise, accumulated dust may cause heating or ignition.

To prevent possible freezing inside the pump in winter, be sure to take antifreeze
measures—such as heat insulation or the installation of a heater to the pump—or completely
drain the pump.

The sliding surface of the mechanical seal may become stiff, which makes it difficult to rotate
the shaft smoothly. Therefore, periodically run the pump to maintain smooth rotation.
Moreover, before running the pump, turn it by hand to check that the rotation is smooth.
Warning
Before rotating the pump shaft by hand to check it, be sure to turn off the
main power. An unexpected start of the pump may cause an accident.

If you have a backup pump, run it from time to time to make it available for operation at any
time.
5.2 Mechanical seal
(1) The mechanical seal is a precision part for preventing liquid leakage from the clearance of the
pump shaft. Carefully handle the seal to ensure the proper operation of the pump.
(2) The mechanical seals are consumables. They wear at a different rate depending on the properties
of circulating liquid, the presence of foreign matter, operating pressure, and other factors; and the
service life changes accordingly.
(3) If there is any liquid leakage at the seal, replace it.
(4) During the initial period of running a new pump, a small amount of leak may occur until the sliding
surfaces on the mechanical seal completely settle (or fit) into place, but the leak should stop in
several hours of operation. Since this initial leak does not mean a defect of the mechanical seal,
you can normally use the pump.
5.3 Daily inspection
Upon startup and during operation, check the pump for any abnormal conditions in terms of its
discharge pressure, electric current, vibration, noise, and others.
5.4 Periodic inspection
(1) Clean any dirt, oil, and other deposits off the outer surface of the coolant pump.
(2) Cutting powder deposited in the tank (oil tank) may cause a pump failure. Periodically clean the
tank (oil tank).
(3) For other inspection items, refer to the Maintenance checklist on the next page.