Heavy Duty Equipment Technician Red Seal Exam Prep · Question
A hydraulic system is operating at excessively high temperatures. After checking the oil level and cooling system, what other component might be contributing to this overheating?
If a relief valve is stuck partially open, it will continuously dump hydraulic fluid back to the reservoir at full pressure, generating significant heat without
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Question: A hydraulic system is operating at excessively high temperatures. After checking the oil level and cooling system, what other component might be contributing to this overheating?
Answer options: ✅ A relief valve stuck in a partially open position
- A worn or damaged pressure gauge
- The use of excessively thin hydraulic fluid
- The reservoir breather being clogged
Correct answer: A relief valve stuck in a partially open position
Explanation: If a relief valve is stuck partially open, it will continuously dump hydraulic fluid back to the reservoir at full pressure, generating significant heat without performing useful work. This constant high-pressure flow creates friction and increases fluid temperature.
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