This is an arm cylinder, a critical component responsible for controlling the movement of the excavator's arm (or boom). It utilizes hydraulic pressure to extend and retract, enabling precise positioning of the work tool. Manufactured to strict tolerances, this cylinder ensures smooth operation and durability, outperforming a worn or leaking original cylinder. Operators may experience a loss of arm control, slow or erratic arm movement, or noticeable hydraulic fluid leaks from the cylinder rod when this component is failing.
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Flush hydraulic lines before fitting new components. Use only manufacturer-specified hydraulic fluid. Check O-rings and backup rings for correct orientation. Bleed air from system after installation.
Always consult the OEM service manual for model-specific torque values and procedures. WhatsApp our technical team if you need fitment guidance.
Initial symptoms of a failing arm cylinder include a slight hesitation during arm extension or retraction and a tendency for the arm to drift downwards when not actively controlled. If ignored, the cylinder will lose significant lifting capacity, potentially causing the arm to drop unexpectedly, and external leaks will increase, risking hydraulic system contamination. Continued operation can lead to structural damage to the cylinder or mounting points.
Ensure the cylinder mounting pins and bushings are in good condition and properly lubricated before installing the new cylinder. Avoid forcing the cylinder into position; it should align smoothly with the mounting points.
Inspect the hydraulic lines connected to the arm cylinder for any signs of wear or leaks, and check the condition of the hydraulic fluid for contamination.