This Arm Cylinder Seal Kit is essential for maintaining the operational integrity of the excavator's arm (or dipper) hydraulic cylinder. It features robust sealing elements designed to prevent internal leakage and external contamination, ensuring the cylinder extends and retracts with full power and precision. Operators will typically notice a loss of arm holding pressure, slow or uncontrolled arm movement, or visible hydraulic fluid leaks from the arm cylinder when this kit fails.
Always verify with serial number before ordering.
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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.
Early indications of seal failure include a slight drift of the arm when holding a load or a faint hydraulic fluid weep. If ignored, the arm will lose its ability to hold position effectively, leading to uncontrolled descent or slow retraction. Continued use with failed seals can result in significant hydraulic fluid loss and potential contamination of the entire hydraulic system.
Carefully clean the inside of the cylinder bore and the piston rod before installing the new seals to prevent damage. Ensure all seals are properly seated and oriented according to the service manual.
Inspect the arm cylinder rod for any pitting or scoring, and check the hydraulic oil for contamination during the seal replacement process.