Crowding (Pulling In) / Digging: The cylinder retracts to pull the stick and bucket towards the machine. This is the primary source of digging force for trenching, breaking ground, and pulling material.
Dumping (Pushing Out) / Reaching: The cylinder extends to push the stick and bucket away from the machine. This action is used to dump loads into trucks, place material at a distance, and level or grade surfaces.
Holding and Positioning: The cylinder, aided by the hydraulic valve's holding valves, locks the stick in a precise position. This is critical for lifting operations, fine grading, and maintaining control when handling heavy or sensitive loads.
This 365-3312 arm cylinder is used for 390D 390F excavator.
EXCAVATOR
390D L 390D
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