2. After electric pump is normally used for 2000 hours, it shall be sent to qualified
maintenance stations for maintenance by the following steps:
Disassembly: Check wearing parts, e.g. rolling bearing, mechanical seal, and impeller,
which shall be replaced if damaged.
Air pressure test: After electric pump is disassembled for repair or a seal is replaced,
the motor cavity and seal cavity must be subjected to air pressure test, the test pressure is
0.2Mpa (megohm), and no leakage or sweating shall occur in a duration of 3min.
Oil replacement: Unscrew the oiling screw at oil chamber, and replace used oil with
No.10 white oil for food-level machinery to reach 95% volume of chamber.
3. If electric pump is not used for a long time, it should not be immersed in the water;
electric pump shall be placed in clean water to run several minutes, cleaned to remove
coagulations inside and outside the pump, dried, subjected to anti-rust treatment, and
placed at dry and ventilated place. Electric pump which has been used for a long time shall
be repainted and subjected to anti-rust treatment depending on its surface corrosion
situation.
Check wearing parts after
2000 hours of operation
Impeller
Mechanical seal
Bearing
Impeller
Bearing
Mechanical seal
When electric pump is not in use,
it shall be cleaned to remove
coagulations on the surface and
dried, and subjected to anti-rust
treatment.
