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Heavy Duty Equipment Technician Red Seal Exam Prep · Question

A heavy-duty truck equipped with a manual transmission exhibits a noticeable 'gear clash' when the operator attempts to engage any gear from a standstill, even with the clutch pedal fully depressed. The clutch pedal free play is within manufacturer specifications. What is the most likely cause of this issue?

Air in the hydraulic clutch system will prevent complete clutch disengagement by not transferring full hydraulic pressure to the slave cylinder, leading to gear

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Question: A heavy-duty truck equipped with a manual transmission exhibits a noticeable 'gear clash' when the operator attempts to engage any gear from a standstill, even with the clutch pedal fully depressed. The clutch pedal free play is within manufacturer specifications. What is the most likely cause of this issue?

Answer options:

  • Worn pilot bearing
  • Warped pressure plate
  • Insufficient clutch pedal free travel ✅ Air in the hydraulic clutch system

Correct answer: Air in the hydraulic clutch system

Explanation: Air in the hydraulic clutch system will prevent complete clutch disengagement by not transferring full hydraulic pressure to the slave cylinder, leading to gear clash. A worn pilot bearing or warped pressure plate would typically cause shuddering or hard shifting, not specifically gear clash from a standstill with full pedal depression. Insufficient clutch pedal free travel would also lead to clutch drag, but the question states free play is within specifications.

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