Answer / devanesan k

The purpose of turning gear will to reduce the initial
torque required to rotate the rotor and it is used to
overcome from the rotor sag.

Answer / anbu

The purpose of turning gear is to rotate the shaft to designed min rpm, when the turbine is in shutdown condition. It is used to avoid eccentricity formation due shaft bend or uneven temperature occur ( may be cool in the bottom side) in the shaft. To overcome this, the shaft should not in ideal state. So, some external source is required to rotate the shaft that is turning gear.

Answer / ajay sharma

A jacking gear (also known as a turning gear) is a device placed on the main shaft of an engine or the rotor of a turbine. The jacking gear rotates the shaft or rotor and associated machinery (such as reduction gears and main turbines), to ensure uniform cool-down. Without turning, hogging or sagging can occur.

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