The boom cylinder's core function is to control the raising and lowering of the excavator's boom—the large, heavy arm attached to the upper structure of the machine.
Lifting Power: It converts hydraulic pressure from the pump into massive linear force and motion. This force is what allows the 329D to lift its own boom, the stick (arm), the attachment (like a bucket), and any heavy material loaded into that attachment.
Precise Control: It enables the operator to position the boom with a high degree of accuracy. This is essential for tasks like digging to a specific depth, carefully placing materials, or finishing grade work.
Stability and Support: When extended, the boom cylinder acts as a rigid structural support, holding the heavy boom and attachment in place against gravity. It is crucial for safe lifting operations.
This 225-4584 boom cylinder is used for 325D 329D 330D2 excavator.
EXCAVATOR
329D 329D L 325D L 325D
MOBILE HYD POWER UNIT
329D L 325D L






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