Heavy Duty Equipment Technician Red Seal Exam Prep · Question
A forestry delimber is equipped with an external gear pump. Which of the following characteristics is a primary limitation of this type of pump compared to an axial piston pump for high-pressure, continuous-duty applications?
External gear pumps have less precise internal clearances and rely on fluid films for sealing, leading to higher internal leakage as pressure increases. This re
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Question: A forestry delimber is equipped with an external gear pump. Which of the following characteristics is a primary limitation of this type of pump compared to an axial piston pump for high-pressure, continuous-duty applications?
Answer options: ✅ Lower volumetric efficiency at higher pressures due to increased internal leakage
- Tendency to cavitate more easily due to its design
- Higher cost and complexity of construction
- Inability to handle contaminated fluids
Correct answer: Lower volumetric efficiency at higher pressures due to increased internal leakage
Explanation: External gear pumps have less precise internal clearances and rely on fluid films for sealing, leading to higher internal leakage as pressure increases. This results in significantly lower volumetric efficiency at higher pressures compared to the tighter tolerances and sealing mechanisms of piston pumps.
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