During the weekly lubrication of the reduction gear, how many turns should the propeller shaft be jacked?

Jacking the propeller shaft during lubrication of the reduction gear is an important maintenance practice designed to ensure that the lubricant is evenly distributed throughout the gearbox and the connected components. The recommended procedure typically requires turning the propeller shaft one and a quarter turns.

This specific amount allows for comprehensive coverage and movement of the lubricating oil into all necessary areas, including the bearings and gears, which helps to minimize wear and tear on the machinery. By rotating the shaft this precise amount, the lubricant can penetrate all necessary surfaces effectively, enhancing the overall efficiency and longevity of the reduction gear system.

In this context, making one full turn may not adequately ensure that all parts are lubricated properly, while two turns could over-lubricate certain areas or lead to potential spillage, which may not be ideal. Thus, the choice of one and a quarter turns strikes a balance, ensuring optimal lubrication without unnecessary complications.