Final answer:
When operating a commercial tractor with a manual transmission, the clutch is used when starting or stopping the vehicle and when shifting gears.
Step-by-step explanation:
When operating a commercial tractor with a manual transmission, there are specific times when you would utilize the clutch:
- When starting or stopping the vehicle: You would engage the clutch to disengage the power from the engine to the transmission and vice versa.
- When shifting gears: You would use the clutch to disengage the current gear, move the gear lever to the desired gear, and then engage the clutch again to connect the engine power to the transmission in the new gear.
By using the clutch correctly, you can smoothly transition between gears and control the movement of the tractor.