310T DRIVE TRAINS
PRACTICE EXAM
Question 1: What is the primary purpose of the clutch brake in a heavy-duty truck transmission?
Choices:
1) To slow the vehicle during normal braking 2) To stop the transmission input shaft from turning to allow engagement of �rst or reverse gear 3) To hold the truck on a hill when starting from a stop 4) To assist the engine brake during steep descents Correct Answer: To stop the transmission input shaft from turning to allow engagement of �rst or reverse gear Explanation: The clutch brake is designed to stop the rotation of the transmission input shaft, allowing the driver to smoothly shift into �rst or reverse gear without gear clash when the vehicle is stationary.Page 1
Question 2: What adjustment must be made to a pull-type clutch to ensure proper
clutch brake squeeze?
Choices:
1) Adjust the linkage to provide inch of release bearing clearance 2) Adjust the adjusting ring to change the distance between the release bearing and the clutch brake 3) Adjust the pedal linkage to ensure 1 inch of free play at the pedal 4) Replace the clutch brake completely Correct Answer: Adjust the adjusting ring to change the distance between the release bearing and the clutch brake Explanation: On a pull-type clutch, proper clutch brake squeeze is achieved by adjusting the internal clutch adjusting ring to set the correct distance (usually inch) between the release bearing and the clutch brake, and then adjusting the external linkage.Question 3: A driver complains of a slipping clutch under heavy load. What is the most likely cause?
Choices:
1) Excessive clutch pedal free play 2) A worn clutch brake 3) Insu�cient clutch pedal free play 4) Broken synchronizer pins
Correct Answer: Insu�cient clutch pedal free play
Explanation: Insu�cient clutch pedal free play prevents the clutch release bearing from fully retracting, keeping slight pressure on the clutch �ngers and not allowing the clutch assembly to fully clamp, leading to slipping.Page 2
Question 4: When installing a new heavy-duty clutch, what tool is essential to ensure the transmission can be installed smoothly?
Choices:
1) Torque multiplier 2) Clutch alignment tool (splined input shaft) 3) Slide hammer 4) Dial indicator
Correct Answer: Clutch alignment tool (splined input shaft)
Explanation: A clutch alignment tool matching the transmission input shaft splines is used to align the driven discs with the pilot bearing, ensuring the transmission input shaft can slide in easily.Question 5: What is the result of riding the clutch pedal (resting the foot on the pedal) while driving?
Choices:
1) Premature wear of the clutch brake 2) Overheating of the transmission �uid 3) Premature failure of the clutch release bearing 4) Excessive wear on the transmission main shaft
Correct Answer: Premature failure of the clutch release bearing
Explanation: Riding the clutch keeps constant pressure on the release bearing against the clutch �ngers, causing the bearing to spin constantly under load and fail prematurely.Page 3