7079936420 7079964520 707-99-36420 707-99-64520 Boom Arm Bucket Hydraulic Cylinder Excavator Seal Kit
For maintenance teams and fleet managers responsible for maintaining the operational efficiency of EXCAVATOR loaders in open-pit mining, rock quarries, and heavy construction—where the Boom Arm Bucket Hydraulic Cylinder systems undertake high-stakes tasks such as digging through 50+ MPa rock (boom lowering force), lifting 15–30 ton ore loads (arm extension), and scooping abrasive gravel (bucket rotation)—the reliability of the hydraulic seal system is non-negotiable. Unlike the tilt-lift-steering systems focused on coordinated precision (e.g., warehouse aisle navigation), boom-arm-bucket systems demand extreme structural resilience: a boom lowering onto bedrock must resist sudden impact, an arm lifting heavy loads needs to withstand constant pressure, and a bucket scraping the ground must repel sharp rock fragments. Every day, these systems operate in environments filled with unique challenges: they endure direct impacts from 2–5 kg rock chunks (during digging), exposure to 0.5–10 mm abrasive particles (gravel, sand), and hydraulic pressure spikes up to 6,000 psi (when breaking through hard soil). All these conditions rely on the leak-proof and impact-resistant performance of the Boom Arm Bucket Hydraulic Cylinder. Once seals fail, the EXCAVATOR loader loses control of boom height, arm lifting capacity, or bucket retention—leading to load drops (e.g., spilled ore), equipment damage (e.g., bent bucket pins), and costly cylinder rod scoring (from unprotected exposure to rock fragments). To avoid such issues, the Boom Arm Bucket Hydraulic Cylinder Excavator Seal Kit (part numbers 7079936420, 7079964520, 707-99-36420, 707-99-64520) is the critical solution. It forms a specialized, impact-optimized seal that adapts to the high-force movements of boom, arm, and bucket, ensuring consistent hydraulic pressure for controlled digging, stable lifting, and secure material retention—while resisting the impacts, abrasion, and pressure spikes unique to these operations.
Correct part numbers are vital to ensure compatibility with the Boom Arm Bucket cylinders of EXCAVATOR loaders, as these systems have distinct dimensional and functional requirements (e.g., boom cylinders need impact-resistant seals, while bucket cylinders require abrasion-proof designs). The 7079936420 (written with hyphens as 707-99-36420) and 7079964520 (written with hyphens as 707-99-64520) serve as trusted references for technicians and procurement staff. They confirm that the seal kit meets the exact rod diameter (80–220mm), pressure range (3,500–6,000 psi), and impact resistance (up to 10 kN force) of Boom Arm Bucket cylinders—not generic hydraulic components. Notably, 707-99-36420 and 707-99-64520 are integrated into global parts management systems (e.g., Caterpillar, Komatsu inventory databases), which is key to avoiding ordering errors. If a wrong seal kit (e.g., one designed for tilt cylinders) is used on a boom cylinder, it will crack within 150 hours of impact exposure, leaving the EXCAVATOR loader out of service for 4–6 days and causing downtime losses of
14,500. For example, a mining site in South Africa using a Komatsu PC400 excavator found that installing a generic tilt seal (instead of 707-99-36420) on the boom cylinder led to a seal rupture during rock digging—dropping a 20-ton ore load and requiring $8,700 in equipment repairs.
In real-world procurement scenarios—whether searching on industrial platforms (e.g., Alibaba Industrial, RS Components), checking regional distributor stock, or negotiating with mining supply vendors—part numbers like 7079936420 and 7079964520 may appear in both hyphenated (707-99-36420, 707-99-64520) and non-hyphenated forms. This flexibility is designed to fit different inventory protocols: small quarry operators may list 707-99-64520 for quick emergency orders, while large mining corporations use 7079964520 for bulk shipments to multiple sites. Importantly, these part numbers exclusively identify the Boom Arm Bucket seal kit and are never used for tilt-lift-steering or auger systems, ensuring technicians get the right product. A construction company in Australia searching for "boom seals for Volvo EC350 excavator" will find that 7079936420 (or 707-99-36420) is directly matched to their model, confirming compatibility with the excavator’s 28-ton lift capacity and 6,000 psi boom pressure. Regardless of format, 7079936420 and 7079964520 guarantee the seal kit is engineered for Boom Arm Bucket demands: it absorbs 10 kN impact forces without tearing, resists 3,500–6,000 psi pressure
