product description

Caterpillar E70B Drive Sprocket – Technical Specifications

1. Part Number & Compatibility

• OEM Part Number: Typically 4Y-3702 (varies by serial number; verify via Cat® SIS).
• Application: Designed exclusively for the Caterpillar E70B compact excavator, compatible with its undercarriage track chain assembly.

2. Material & Manufacturing

• Material: High-tensile alloy steel (SAE 4140), heat-treated to achieve:
  • Surface hardness: HRC 55-60 (induction hardened).
  • Core toughness: Impact-resistant to prevent cracking.
• Process: Precision forged + CNC-machined; tooth profile laser-verified for optimal track link engagement.

• 3. Key Dimensions

  • Tooth Count: 11 teeth (may vary by production year).
  • Pitch: 152mm (6"), matching E70B track chain pitch.
  • Bore Diameter: Ø80mm±0.02mm (fits sprocket shaft with tight tolerance).
  • Mounting Bolts: M20×1.5, torque specification: 450-500 N·m.

4. Performance Features

• Wear Resistance: Hardened tooth surface (depth: 3-5mm) for extended service life in abrasive conditions (e.g., rock, gravel).
• Anti-Shock Design: Optimized root fillet radius to reduce stress concentration.
• Sealing Integration: Machined grooves for dual-lipped radial seals (prevents grease leakage/contamination).

5. Maintenance Guidelines

• Replacement Interval: Inspect every 2,000–3,000 service hours; replace if tooth thickness is worn beyond 15%.

• Lubrication: Grease via zerk fittings every 250 hours using NLGI #2 lithium-based grease.

• Paired Replacement: Recommended to replace track chains simultaneously to avoid uneven wear/meshing issues.

Founded in 2004,it has a history of 18yearsIt is located in Quanzhou,Fujian Province, a well -known overseas Chinese hometown in southern Fujian,adjacent to Quanzhou Jinjiang Airport.The transportation is very convenient.After the company's unremitting development and improvement of the market over the past few years,the company has now become a modern mechanical accessories manufacturer that integrates and trade.

The company specializes in the production of CCJT,JTRTR,UTR,KRT,LY,WX, WJW,KTW,NF,QBE,TYD,FBDF,Jinsai and other brands,imports,domestic four-wheeled excavators,rotary rig,crawler cranes The chassis of the machine,the bulldozer,and the loss of the loss.The main products are:branches,dragging wheels,guidance wheels,driving teeth,chain assembly,chain board screws,Qianqiu frame,chain shelf,connecting rod, tightening oil cylinder,spring,mala head,bucket shaft,bucket,bucket,bucket,fight Axial sleeve,fighting ears,digging,U-racks,driving tooth screws,guidance wheel screws,etc. After the product was issued stricly,it was strictly inspected to meet the quality requirements of the host supporting manufacturers.It was sold wll across the country and exported to Southeast Asia,Europe and the United States and other countries to receive unanimous praise from users.

Since the establishment of an enterprise,adhering to the business purpose of"seeking survival with quality and creating a brand for development",in order to better adapt to the extensive needs of domestic and foreign industrial and mining accessories markets, enterprises have continuously renewed production equipment,and at the same time recruit professional and technical talents,and continuously strengthen strengthening Internal management of the enterprise strives to produce better products to meet the widespread needs of new and old customers from allwalks of life.Has a complete and scientific quality management system.The integrity,strength and product quality of Quanzhou Jinsai Machinery Co.,Ltd.have been recognized by the industry.Friends from allwalks of life are welcome to visit,guide,and business negotiations.