What is the minimum pressure at which the governor should cut in?

The correct answer is 85 psi because this value represents the minimum pressure setting at which the governor should activate to maintain adequate performance and safety in hydraulic systems, particularly in fire apparatus. The governor plays a crucial role in regulating engine speed and maintaining the necessary pressure in the water system, which is vital for effective firefighting operations. If the pressure drops below this threshold, it can result in insufficient water supply, impacting firefighting capabilities. Thus, setting the governor cut-in pressure at 85 psi ensures that the system remains functional while providing a reliable amount of pressure needed for effective operation.