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Heavy Duty Equipment Technician Red Seal Exam Prep · Question

Which of the following describes the primary function of a locked-rotor stall test on a torque converter equipped machine?

A locked-rotor stall test, or stall speed test, checks the engine's ability to pull against a fully stalled torque converter. It helps identify issues with engi

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Question: Which of the following describes the primary function of a locked-rotor stall test on a torque converter equipped machine?

Answer options:

  • To measure engine power output and transmission efficiency
  • To determine the maximum hydraulic pressure in the system ✅ To assess the condition of the torque converter and engine performance under load
  • To check the engagement timing of the forward and reverse clutches

Correct answer: To assess the condition of the torque converter and engine performance under load

Explanation: A locked-rotor stall test, or stall speed test, checks the engine's ability to pull against a fully stalled torque converter. It helps identify issues with engine power, fuel system, or torque converter internal slippage.

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