On a hydraulic crane what keeps the manual extension from retracting after it's extended?

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Multiple Choice

On a hydraulic crane what keeps the manual extension from retracting after it's extended?

Explanation:
The key idea is a positive, simple lock that physically holds the extended section in place. A locking pin is inserted through aligned holes or a receptacle in the extension and the main body, creating a solid barrier to inward movement. Once the pin is in place, it resists gravity and any hydraulic or external forces that might try to pull the extension back, keeping it fixed until you remove the pin. This direct, mechanical restraint is safer and more reliable for maintaining the extension than relying on hydraulic pressure, springs, or a ratchet mechanism, which may not fully prevent retraction in all situations.

The key idea is a positive, simple lock that physically holds the extended section in place. A locking pin is inserted through aligned holes or a receptacle in the extension and the main body, creating a solid barrier to inward movement. Once the pin is in place, it resists gravity and any hydraulic or external forces that might try to pull the extension back, keeping it fixed until you remove the pin. This direct, mechanical restraint is safer and more reliable for maintaining the extension than relying on hydraulic pressure, springs, or a ratchet mechanism, which may not fully prevent retraction in all situations.

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