Heavy Duty Equipment Technician Red Seal Exam Prep · Question
A technician is troubleshooting a heavy-duty wheel loader that exhibits slow and weak hydraulic functions, but the main relief valve pressure tests within specification at 24,000 kPa. The system uses a variable displacement piston pump. What is the most likely cause of the observed symptoms?
If the main relief pressure is good but functions are slow and weak, it suggests insufficient flow. A malfunctioning compensator control on a variable displacem
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Question: A technician is troubleshooting a heavy-duty wheel loader that exhibits slow and weak hydraulic functions, but the main relief valve pressure tests within specification at 24,000 kPa. The system uses a variable displacement piston pump. What is the most likely cause of the observed symptoms?
Answer options:
- A blocked return line filter causing back pressure ✅ The pump's compensator control is set too low or malfunctioning
- The hydraulic oil viscosity is too high for the ambient temperature
- An internal leak within a hydraulic cylinder
Correct answer: The pump's compensator control is set too low or malfunctioning
Explanation: If the main relief pressure is good but functions are slow and weak, it suggests insufficient flow. A malfunctioning compensator control on a variable displacement piston pump would prevent it from stroking up to its full displacement, directly reducing flow output even when pressure demand is high.
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