Nissei Corporation


No.4 The grease leaks

Reducer (without motor) [Cause and countermeasure]

The grease leaks

Defect of the gear head (4.1)

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Classification No. Cause Countermeasure Inspection procedure and action Judging criterion
4.1.1 Damage of the oil seal Repair by Nissei Check it visually The oil is not dripping nor bleeding
4.1.2 Aging of the oil seal Repair by Nissei Check it visually The oil is not dripping nor bleeding
4.1.3 Adhesion to the output shaft Clean it and wait and see Check it visually The oil is not dripping nor bleeding
4.1.4 Initial wear of the oil seal Repair by Nissei Check it visually The oil is not dripping nor bleeding
4.1.5 There are pores in the casting Repair by Nissei Check it visually The oil is not dripping nor bleeding
4.1.6 Loosening of the tightening bolts Additional tightening Additional tightening of the bolts of the fitting section The oil is not dripping nor bleeding
4.1.7 Disassembled and then assembled Replacement Contact Nissei The oil is not dripping nor bleeding
4.1.8 Rust Clean it and wait and see Check it visually The oil is not dripping nor bleeding
4.1.9 External oil is adhered (misjudgement) Wipe it off and wait and see Check it visually The oil is not dripping nor bleeding
4.1.10 Anti-rust oil was not wiped off at the time of shipment Wipe it off and wait and see Check it visually The oil is not dripping nor bleeding

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Defect of the installation or couplings (4.2)

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Classification No. Cause Countermeasure Inspection procedure and action Judging criterion
4.2.1 Inconsistency of the centers of the shafts Align the centers of the shafts with each other Check the misalignment amount Report the misalignment amount to the coupling manufacturer and check whether it is within the allowable range

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Defect of a load part or operating conditions (4.3)

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Classification No. Cause Countermeasure Inspection procedure and action Judging criterion
4.3.1 Excessive overhung load Remove the load Check that it is equivalent to or less than the allowable O.H.L. value It is equivalent to or less than the allowable O.H.L. value written on the catalog

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