Heavy Duty Equipment Technician Red Seal Exam Prep · Question
A heavy equipment operator reports that the machine's primary work functions are slow and weak after the hydraulic oil reaches operating temperature. Cold operation is normal. What is the most likely cause?
When hydraulic oil heats up, its viscosity decreases. Worn pump components (e.g., gears, pistons, vanes) will have increased internal leakage (slippage) as the
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Question: A heavy equipment operator reports that the machine's primary work functions are slow and weak after the hydraulic oil reaches operating temperature. Cold operation is normal. What is the most likely cause?
Answer options: ✅ Worn hydraulic pump components
- A clogged hydraulic oil filter
- An over-pressurized relief valve
- A faulty pilot control valve
Correct answer: Worn hydraulic pump components
Explanation: When hydraulic oil heats up, its viscosity decreases. Worn pump components (e.g., gears, pistons, vanes) will have increased internal leakage (slippage) as the oil becomes thinner, leading to a significant loss of efficiency and reduced performance when hot, while potentially performing acceptably when cold with thicker oil.
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