Heavy Duty Equipment Technician Red Seal Exam Prep · Question
A construction company's wheel loader is exhibiting significantly reduced lift capacity. The technician measures the main relief valve pressure at 15,000 kPa, which is 5,000 kPa below the OEM specification. The pump flow rate appears normal when tested. Which action is most appropriate?
Reduced lift capacity directly correlates with insufficient system pressure. If the main relief valve is set too low or malfunctioning, it will prematurely dump
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Question: A construction company's wheel loader is exhibiting significantly reduced lift capacity. The technician measures the main relief valve pressure at 15,000 kPa, which is 5,000 kPa below the OEM specification. The pump flow rate appears normal when tested. Which action is most appropriate?
Answer options: ✅ Adjust or replace the pressure relief valve.
- Replace the hydraulic pump, as it is likely worn.
- Check for blockages in the hydraulic suction line.
- Investigate potential cavitation in the pump.
Correct answer: Adjust or replace the pressure relief valve.
Explanation: Reduced lift capacity directly correlates with insufficient system pressure. If the main relief valve is set too low or malfunctioning, it will prematurely dump flow, preventing the system from reaching its design pressure, even if the pump itself is capable of producing flow.
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