What engine RPM is recommended for the air governor cut out test?

The recommended engine RPM for the air governor cut out test is in the range of 1200 to 1500 RPM. At this RPM, the engine is typically operating at a level that allows for effective function of the air governor system. The air governor plays a crucial role in maintaining the air pressure for the braking system, and testing it at this RPM ensures that the system's performance can be accurately assessed.

When the engine is at this RPM, the air compressor is functioning efficiently, allowing for a proper reading of when the governor will cut out and stop compressing air into the system. Conducting the test outside of this specified range could lead to inaccurate results, as the compressor may not provide sufficient air pressure or may operate outside its optimal parameters. Therefore, maintaining this RPM range is essential for a valid and reliable test of the air governor's function.