Bottom Roller Replacement for John Deere 52D Excavator Undercarriage Mini Excavator Track Roller

Item specifics: Compatible with Cat Model: 304 304.5 305 305.5 306 Part Type: Bottom Roller Compatible Equipment Type: Excavator Description： 1. Shell Material 50Mn, through hardened HRC 25-28, CASE hardened HRC52-56, hardened thickness 5-8mm. 2. Side cover : QT450-10. Strength is as follows Tensile strength σb (MPa): ≥450 Yield strength σ0.2 (MPa):≥310 Hardness:160 ~ 210 hb 3. Roller, 45# carbon steel or 40Cr, quenched HRC25-30, surface quenched HRC52-58, hardened to a depth of 2-3mm. 4. Locking pin, 65Mn or 45 carbon steel, hardened HRC25-28. 5. Bolt, grade 12.9, HRC45-52. 6. 6. Seal: Nitrile rubber. Operating temperature range -20℃ to 110℃.

• For Caterpillar Cat 304 304.5 305 305.5 306
• Bottom Roller Weight：19.84 pounds； Package Dimensions：6.69"X6.69"X10.6"
• This bottom roller is a durable undercarriage replacement part for your excavator. Our rollers utilize special high strength-hardened steel and quality seal groups that provide excellent lubricating oil retention.
• Sealed bearings stop dirt, mud, and grime from penetrating inner components. It was designed and manufactured to exact OEM specifications using a high-quality, high-strength steel.
• If you have any questions, never mind contact our friendly,helpful,and knowledgeable customer service representatives,we will be glad to address any questions or concerns promptly.