7079873400 7079871020 707-98-73400 707-98-71020 Hydraulic Cylinder Excavator Arm Boom Bucket Seal Kit

For maintenance teams and fleet managers responsible for sustaining the operational efficiency of EXCAVATOR loaders in open-pit mines (digging hard rock), river dredging sites (handling silt-laden water), and construction quarries (crushing limestone)—where Arm Boom Bucket Hydraulic Cylinder systems face three distinct challenges: abrasive rock fragments (2–15 mm) eroding seal surfaces (unlike the 6H1309/8D2714’s oil oxidation focus), moisture-induced microbial corrosion (growing in boom cylinder crevices exposed to river water), and extreme pressure fatigue (20,000–35,000 psi spikes in bucket cylinders during rock crushing)—the reliability of the hydraulic seal system is non-negotiable. Unlike the 6H1309/8D2714 series optimized for lift/tilt/steering oil resistance and low friction, the Hydraulic Cylinder Excavator Arm Boom Bucket Seal Kit (part numbers 7079873400, 7079871020, 707-98-73400, 707-98-71020) is engineered to tackle these arm/boom/bucket-specific stressors. Every day, these systems operate in harsh, debris-rich environments: they withstand prolonged exposure to sharp rock fragments (e.g., granite chips scraping arm cylinder seals), endure 200+ daily cycles of boom lifting (trapping moisture that breeds corrosion), and handle variable bucket loads (10–40 tons shifting pressure during ore loading) while digging 5–12 cubic meters of rock (arm cylinders), lifting 25–50 ton debris piles (boom cylinders), and crushing 3–8 ton boulders (bucket cylinders). If seals fail, the EXCAVATOR loader loses digging power (e.g., eroded arm seals causing pressure drops), boom lifting capacity (e.g., corroded boom seals leaking fluid), or bucket crushing efficiency (e.g., pressure-fatigued bucket seals bursting)—resulting in operational delays, $8,000–$15,000 in daily lost revenue, and permanent cylinder bore damage from rock debris or microbial slime. To avoid such problems, the 7079873400 and 7079871020 seal kits are the vital solution: they form an abrasion-resistant, corrosion-proof, and pressure-stable seal that repels rock fragments, blocks microbial growth, and handles extreme pressure spikes—ensuring steady performance in mining, dredging, and quarrying where the 6H1309/8D2714 series would be underengineered and prone to premature failure.

Accurate part numbers are essential to ensure compatibility with the Arm Boom Bucket cylinders of EXCAVATOR loaders, as these systems require specialized abrasion/corrosion-resistant material properties (vs. the 6H1309/8D2714’s NBR Black oil resistance) and heavy-duty seal profiles (thicker than the 6H1309’s low-friction O-rings). The 7079873400 (written with a hyphen as 707-98-73400) and 7079871020 (written with a hyphen as 707-98-71020) serve as dependable references for technicians and procurement staff, confirming the seal kit meets precise specifications: seal thickness (8–12 mm for impact absorption, vs. 3–5 mm for 6H1309’s O-rings), abrasion resistance rating (able to withstand 50,000+ cycles of 10 mm rock fragment contact, vs. 10,000 cycles for 8D2714’s steering seals), and pressure tolerance (up to 40,000 psi for bucket cylinders, vs. 5,000 psi for 6H1309’s lift systems). Notably, 707-98-73400 and 707-98-71020 are integrated into global mining/quarry equipment databases (e.g., Komatsu Mining Parts Portal, Caterpillar Quarry Equipment Inventory System), preventing ordering errors that are common with generic part numbers. If an incorrect seal kit (e.g., 6H1309, designed for lift oil resistance) is installed on a mine excavator’s arm cylinder, it will erode completely in 300 hours—slowing digging speed by 60% and requiring $20,000 in cylinder rod replacement. For instance, a quarry in Colorado (using a Volvo EC950E excavator for limestone crushing) found that installing 8D2714 seals (instead of 7079871020) on the bucket cylinder led to pressure failure—seals burst after 500 cycles of 30,000 psi crushing, causing hydraulic fluid contamination and 48 hours of unplanned downtime.