Caterpillar excavator EC55/140/220/210/29 guide wheels, guide wheels, traveling tensioning wheels

The Caterpillar E55 excavator guide wheel is a precision-engineered chassis component constructed from high-strength wear-resistant cast steel. Its critical flange surfaces undergo quenching and hardening processes for enhanced durability. This component plays a vital role in guiding and restricting the track chain while ensuring low-resistance rotation through its internal bearing/bushing system and lubrication channels.

• Core Material: High-tensile cast steel (Grade ZG340-550, yield strength ≥550 MPa)
• Wheel Rim: Induction-hardened surface (HRC 55-60), wear depth ≥5 mm
• Bearing System: Sealed needle roller bearings (DIN 5402) or Bronze bushings (CuSn8P, oil-impregnated)
• Sealing: Dual-lip steel-case seals + Nitrile O-rings (IP68-rated, -30°C to 120°C)
• Lubrication: Central grease nipple (1/4" NPT), accepts lithium-complex grease

• Load Capacity: Static: 8,000 kg • Dynamic shock load: 15 kN (ISO 5683 compliant)
• Service Life: Standard conditions: 3,000-5,000 hrs • Severe conditions: ≤1,500 hrs
• Operating Temperature: -40°C to +80°C (ambient)

• Lubrication Interval: Normal: 50 hrs (150g grease) • Severe: 20 hrs
• Wear Limits: Rim thickness wear >10% requires replacement • Flange height <15 mm indicates high derailment risk
• Track Tension: Maintain 30-50 mm sag (mid-span between carriers)

• Genuine CAT Identification: Laser-etched p/n 8Y-0721 + CAT logo on casting
• Aftermarket Selection: Require material certification and ISO 9001-certified manufacturers
• Risk Alert: Non-genuine idlers may cause premature seal failure and track misalignment