If the gear reducer (gearbox) leaks lubricating oil, you can refer to as below:

1. Source of lubricating oil leakage: 1). Seal of output shaft; 2). Input shaft; 3). Motor shell; 4). lubricating oil outlet
2. Reason of lubricating oil leakage: 1). lubricating oil seals wear out and rigidification; 2). Sand holes of motor shell; 3). lubricating oil mass and running speed
3. Solution: 1). Replace lubricating oil seal; 2). Check the shaft around the lubricating oil seal; 3). Replace motor shell; 4). Increase or decrease the amount of lubricating oil

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