Heavy Duty Equipment Technician Red Seal Exam Prep · Question
When measuring hydraulic pump stand-by pressure on a closed-center system, what does a pressure reading significantly lower than specifications typically indicate?
In a closed-center system, stand-by pressure is maintained by the pump's compensator at a reduced flow (often called 'zero flow' or 'cut-off'). If this pressure
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Question: When measuring hydraulic pump stand-by pressure on a closed-center system, what does a pressure reading significantly lower than specifications typically indicate?
Answer options: ✅ Internal leakage within the pump or control valve
- A relief valve set too low
- A clogged suction line
- A faulty pressure gauge
Correct answer: Internal leakage within the pump or control valve
Explanation: In a closed-center system, stand-by pressure is maintained by the pump's compensator at a reduced flow (often called 'zero flow' or 'cut-off'). If this pressure is too low, it suggests internal leakage past the pump's swashplate mechanism, control valve, or seals, preventing the system from building and holding specified standby pressure.
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