Heavy Duty Equipment Technician Red Seal Exam Prep · Question
During a pre-trip inspection, a heavy equipment operator notices that the air pressure gauge on their wheel loader consistently shows a pressure of 145 psi, even after the compressor has cycled off. The manufacturer's specification for the system is 120 psi. What is the most immediate concern?
An air system that exceeds its specified maximum pressure indicates a failure of the safety relief valve to open and release the excess pressure. This creates a
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Question: During a pre-trip inspection, a heavy equipment operator notices that the air pressure gauge on their wheel loader consistently shows a pressure of 145 psi, even after the compressor has cycled off. The manufacturer's specification for the system is 120 psi. What is the most immediate concern?
Answer options:
- The air dryer is saturated and requires replacement. ✅ The safety relief valve is stuck shut or set too high.
- The brake interlock valve is faulty.
- The compressor discharge line is restricted.
Correct answer: The safety relief valve is stuck shut or set too high.
Explanation: An air system that exceeds its specified maximum pressure indicates a failure of the safety relief valve to open and release the excess pressure. This creates a dangerous condition that could lead to component failure. While other issues might affect air system performance, none directly lead to dangerously high, unchecked pressure as a primary cause.
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