Caterpillar E70B Sprocket and E307B/E307C/E308C E307V1 / E307V2 can be universal

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.

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