What should you wait for after reducing engine speed to idle and placing the transmission in neutral while disengaging a pump?

Waiting for the drive shaft to stop spinning is crucial after reducing engine speed to idle and placing the transmission in neutral while disengaging a pump. This step ensures that all mechanical components linked to the pump are no longer in motion, which is essential for safety and preventing damage. If the drive shaft continues to spin while the pump is being disengaged, it could lead to accidents or equipment failure, especially as pressure fluctuations may occur at that time.

This practice allows the operator to safely check and monitor the pump's status and any remaining pressure before fully disengaging. The focus on stopping the drive shaft underscores the importance of mechanical safety, preventing inadvertent engagement while troubleshooting or performing maintenance.