Heavy Duty Equipment Technician Red Seal Exam Prep · Question
A hydrostatic drive system in a forestry machine utilizes a variable displacement pump and motor. If the pump is operating at maximum displacement and the motor at minimum displacement, what is the effect on the machine's speed and torque?
In a hydrostatic drive, increasing pump displacement increases flow (speed potential), while decreasing motor displacement reduces speed but increases the motor
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Question: A hydrostatic drive system in a forestry machine utilizes a variable displacement pump and motor. If the pump is operating at maximum displacement and the motor at minimum displacement, what is the effect on the machine's speed and torque?
Answer options:
- High speed, low torque ✅ Low speed, high torque
- Medium speed, medium torque
- Zero speed, maximum torque
Correct answer: Low speed, high torque
Explanation: In a hydrostatic drive, increasing pump displacement increases flow (speed potential), while decreasing motor displacement reduces speed but increases the motor's torque output for a given pressure. So, maximum pump displacement (high flow) combined with minimum motor displacement (maximum torque conversion) results in low speed and high torque at the output shaft, a common operational strategy for heavy loads.
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