Heavy Duty Equipment Technician Red Seal Exam Prep · Question
A heavy-duty excavator hydraulic system operates with a main relief valve setting of 21,000 kPa. If the pump is operating and the main relief valve is actively bypassing fluid, what is the approximate pressure reading a technician would observe on a gauge connected to the pump outlet line?
When a relief valve is actively bypassing fluid, it indicates that the system has reached the set pressure of the relief valve. Therefore, the observed pressure
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Question: A heavy-duty excavator hydraulic system operates with a main relief valve setting of 21,000 kPa. If the pump is operating and the main relief valve is actively bypassing fluid, what is the approximate pressure reading a technician would observe on a gauge connected to the pump outlet line?
Answer options: ✅ Approximately 21,000 kPa
- Significantly below 21,000 kPa, indicating low system demand
- Significantly above 21,000 kPa, due to pump overpressure
- Zero kPa, as all fluid would be bypassing back to the tank
Correct answer: Approximately 21,000 kPa
Explanation: When a relief valve is actively bypassing fluid, it indicates that the system has reached the set pressure of the relief valve. Therefore, the observed pressure will be approximately equal to the relief valve's setting.
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