Motor as one of the main drives of a centrifugal pump is an important part of the normal work of the centrifugal pumps. In order to reduce the failure rate of the motor, it is necessary to regularly overhaul and maintain the motor bearing, test the motor bearing temperature, find the problem in time, and fill the grease regularly. Today's article we mainly from

How long is the oiling cycle of the motor bearing
How much motor bearing grease refill is
What kind of grease to choose
Motor bearing greasing method

Four aspects to discuss the maintenance of motor bearings

How long is the oiling cycle of the motor bearing

General two-pole motor refilling once every six months, four-pole motor refilling once a year, but also according to some motor factory on the bearing requirements of the time to refill, they are generally calculated by running hours

How much motor bearing grease refill is

The amount of filling is generally between 1/2-2/3, add less lubrication effect is not good, add more will cause the motor bearing overheating
Generally in the production site when the usual maintenance, according to the motor bearing lubricating oil situation to decide, if the lubricating oil is less can timely replenish, if the lubricating oil deterioration should all replace

What kind of grease to choose

Please see the following table for grease selection

NameDesignatorAppearanceDrop point not less than (℃)Water resistanceApplication
Sodium-based greaseZN-2Dark yellow to dark brown uniform ointment140Soluble in waterHigher operating temperature, clean and moisture-free conditions, suitable for open motors
Sodium-based greaseZN-3Dark yellow to dark brown uniform ointment140Soluble in waterHigher operating temperature, clean and moisture-free conditions, suitable for open motors
Sodium-based greaseZN-4Dark yellow to dark brown uniform ointment150Soluble in waterHigher operating temperature, clean and moisture-free conditions, suitable for open motors
Calcium GreaseZG-2Pale yellow to dark brown homogeneous ointment80Insoluble in waterNormal operating temperature. Moisture or water contact conditions. Suitable for closed type motor
Calcium GreaseZG-3Pale yellow to dark brown homogeneous ointment85Insoluble in waterNormal operating temperature. Moisture or water contact conditions. Suitable for closed type motor
Calcium GreaseZG-4Pale yellow to dark brown homogeneous ointment95Insoluble in waterNormal operating temperature. Moisture or water contact conditions. Suitable for closed type motor
Calcium GreaseZG-5Pale yellow to dark brown homogeneous ointment120Insoluble in waterNormal operating temperature. Moisture or water contact conditions. Suitable for closed type motor
Calcium and sodium greaseZGN-2Yellow to brown homogeneous ointment120Weakly hydrophilicHigher working temperature, with water vapor, for open type and closed type motors
Calcium and sodium greaseZGN-3Yellow to brown homogeneous ointment135Weakly hydrophilicHigher working temperature, with water vapor, for open type and closed type motors
Calcium complex greaseZFG-1Pale yellow to dark brown smooth, clear ointment180Strongly water resistantHigh working temperature, water contact, or severe water contact. For closed type motor
Calcium complex greaseZFG-2Pale yellow to dark brown smooth, clear ointment200Strongly water resistantHigh working temperature, water contact, or severe water contact. For closed type motor
Calcium complex greaseZFG-3Pale yellow to dark brown smooth, clear ointment220Strongly water resistantHigh working temperature, water contact, or severe water contact. For closed type motor
Aluminum Complex GreaseZFU-1Pale yellow to dark brown smooth transparent ointment180Highly resistant to waterFor open type and closed type motors under high-temperature working conditions, water contact and severe moisture
Aluminum Complex GreaseZFU-2Pale yellow to dark brown smooth transparent ointment200Highly resistant to waterFor open type and closed type motors under high-temperature working conditions, water contact and severe moisture
Aluminum Complex GreaseZFU-3Pale yellow to dark brown smooth transparent ointment200Highly resistant to waterFor open type and closed type motors under high-temperature working conditions, water contact and severe moisture
Molybdenum sulfide grease3#Gray or brown glossy ointment220Highly resistant to waterHigh-temperature working conditions, severe moisture, especially for hot and humid zone motors
Molybdenum sulfide grease4#Gray or brown glossy ointment210Highly resistant to waterHigh-temperature working conditions, severe moisture, especially for hot and humid zone motors

Motor bearing greasing method

First of all, choose the grease correctly, then add grease according to the following requirements.

Pay attention to the surrounding environment, must keep the grease pure, do not let the dust, sand blown into, and metal particles and other impurities mixed in.
Tools such as fingers or bamboo must be clean.
When refueling on the bearing cover, it is not appropriate to add too much, to account for 60% to 70% of the bearing cover oil cavity.
When refueling on the bearing, just add grease until it can seal the steel ball flatly.

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