The extension cylinder on a Cat 336D is not a standard component on every machine. It is a key hydraulic actuator that is integral to the operation of an optional attachment, most commonly a hydraulic thumb. This cylinder enables the excavator to perform grabbing and clamping tasks, significantly expanding its versatility beyond basic digging.
This 363-0649 extension cylinder is used 336D 325D 329D 323D excavator.

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