This is an Arm Cylinder Seal Kit designed to replace worn seals within the main boom cylinder of Volvo excavators, preventing hydraulic fluid leaks and maintaining system pressure. It is constructed from durable NBR rubber and high-strength acetal components, exceeding the performance of degraded or cracked seals. Operators will typically observe external hydraulic fluid leaks around the cylinder rod, a loss of lifting power, or the boom slowly drifting down when the cylinder seals fail.
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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.
The most common symptom of failing arm cylinder seals is visible hydraulic fluid leakage from the cylinder rod. If ignored, this leakage will worsen, leading to a noticeable loss of lifting capacity and potentially causing the boom to drift downwards under load. Continued operation risks hydraulic system contamination and potential damage to the cylinder bore.
Carefully inspect the cylinder rod for any scoring or damage before installing new seals, as imperfections can quickly ruin even the best quality seals. Ensure all old seal material is completely removed from the cylinder grooves to guarantee a proper fit.
Inspect the hydraulic fluid for contamination and check the condition of the hydraulic filter when replacing arm cylinder seals.