What is the normal disengaged pressure range for reduction gears in psi?

The normal disengaged pressure range for reduction gears is indeed between 15 to 65 psi. This range is critical because it indicates the proper operation of the reduction gear system when the gears are not engaged. Understanding this pressure range ensures that the system is functioning within its design limits, preventing potential issues such as overpressure situations that could lead to gear failure or inefficiencies in the power transmission from the engine.

The specified range reflects the manufacturer's guidelines for the expected pressure conditions when the gears are not actively engaging, which is vital for ensuring lubrication and cooling of the components. This pressure also supports maintaining the functionality of seals and other critical parts within the reduction gear assembly, contributing to the overall reliability and performance of the vessel.

The other choices do not align with the typical operational standards for disengaged pressures in reduction gears, highlighting the importance of referring to correct specifications to ensure the safe and efficient operation of marine propulsion systems. Always referencing the manufacturer’s specifications or operational guidelines is a best practice in maintaining equipment integrity and safety.