Leaking seals are the bane of gearbox users. Since lubrication is the life blood of enclosed drives, maintaining oil levels is critical to long life. When oil starts leaking, corrective action is necessary, but what action? What’s going wrong? Actually, the answers can be varied as the gear type used, how it’s mounted, the speed it’s running and the environment it’s in. We had a user of a competitive worm gear speed reducer give us a call. He had his gearbox mounted with the output shaft horizontal and his quill mounted motor pointing vertical, below the reducer. His problem was the input shaft seal was leaking and ooding his motor. He was trying to nd out why and what to do about it. Not knowing the exact internal design of this manufacturer’s gearbox, the best we could do was ask some

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