Ship Rolling problem
In order to reduce end-play and avoid hammering during rolling, machines should be installed with their axis of rotation either vertical or in the fore and aft direction.
If they unavoidably have to be placed athwartship, care must be taken to reduce the end-play and to provide suitable thrust bearings to prevent any hammering action when the ship rolls.
Special attention must also be paid to lubrication of ring-lubricated sleeve bearings.
Overheating in Electrical Joints
The usual cause of overheating in electrical joints is loose connections, and to counter this, particularly in view of the ever-present vibration problem, not only should all screws and nuts be effectively locked but they must also be examined periodically and tightened if necessary.
This applies not only to high-current circuits but also to control and shunt circuits, any of which if allowed to become slack may result in erratic operation or a complete failure.