CPCS A36 Lorry Loader (NOCN CPCS, UK) Practice Questions - CPCS A36 Lorry Loader Theory & Technical Test Exam

What is the function of the main relief valve in a lorry loader hydraulic circuit?

To protect the overall hydraulic system from dangerous over-pressurization by diverting excess oil back to the reservoir To automatically disengage the vehicle PTO when oil temperature drops below 10°C To lock out slewing controls whenever outriggers are fully retracted To increase fluid velocity inside the hydraulic extension cylinders

Correct Answer:

To protect the overall hydraulic system from dangerous over-pressurization by diverting excess oil back to the reservoir

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