• Cylinder Rebuild/Repair Seal Kit for JCB 210S & 210SU Backhoes

• Serial Numbers: 0659599 - 0659999; 0760001 - 0764999;
• Cylinder #s: 556-60017, 556-60023, 556-60024
• Rod: 40 mm
• Bore: 70 mm

Borise oil seal material: main oil seal (thickness: Japanese standard)

1. Ordinary model: P6000 (MDI caprolactone) (Parker p6000 material formula improved, K grade), the main oil seal material of other manufacturers in the market is basically P6000; high temperature resistance 110°, limit temperature 120°; (cost 16w/ton , lower loss rate)

High-elastic and upgraded models: PPDI (polyurethane), the material used in military missiles; high temperature resistance 150°, limit temperature 170°; its resilience is 30% higher than that of P6000 material, and its wear resistance is also twice that of P6000 material; ( The cost is 60w/ton, the loss rate in the manufacturing process is 30%--50%, the larger the model, the higher the loss rate); the hardness of the Boris main oil seal is 96° which is the highest hardness standard, but it feels softer; others on the market The hardness of the oil seal is basically 95°, and it feels hard);