Heavy Duty Equipment Technician Red Seal Exam Prep · Question
An excavator hydraulic pump is rated for an output of 200 L/min at 2000 RPM. If the engine speed is reduced by 25% due to an operator selecting economy mode, and assuming the pump is a fixed-displacement type, what would be the approximate new flow rate?
For a fixed-displacement pump, the flow rate is directly proportional to the input speed. A 25% reduction in RPM means a 25% reduction in flow: 200 L/min * (1 -
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Question: An excavator hydraulic pump is rated for an output of 200 L/min at 2000 RPM. If the engine speed is reduced by 25% due to an operator selecting economy mode, and assuming the pump is a fixed-displacement type, what would be the approximate new flow rate?
Answer options: ✅ 150 L/min
- 160 L/min
- 175 L/min
- 200 L/min
Correct answer: 150 L/min
Explanation: For a fixed-displacement pump, the flow rate is directly proportional to the input speed. A 25% reduction in RPM means a 25% reduction in flow: 200 L/min * (1 - 0.25) = 150 L/min.
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