【COMPATIBLE WITH】 for John Deere Mini Excavators：26G, 27C, 27C ZTS, 27D, 27 ZTS, 30G, 35C ZTS, 35D, 35G, 35 ZTS; for Hitachi Mini Excavators：EX20UR-1, EX20UR-2, EX22, EX25, EX25-2, EX27U, EX30, EX30-1, EX30-2, EX30UR-1, EX30UR-2, EX35, EX35-1, EX35-2, EX35U, EX40UR-1, EX40UR-2, EX40UR-3, ZX27U, ZX27U-3, ZX35U-2, ZX35U-3, ZX35U-5; for Case Mini Excavators：CX27B, CX31B, CX36B; for Komatsu Mini Excavators：PC20-7, PC27MR-1, PC27MR-3, PC27MR-8, PC27R-8, PC28UU-1, PC30UU-2, PC35MR-1, PC35MR-5, PC35R-8; 【REPLACEMENT PART NUMBER】 9237937, MU3238, 4340535, FYD00008528, FYD00005461, 9106668, 9240379, 4719574, PX64D00069F1, SK30SR-3, SK35SR-2E 【PACKAGE LIST & SPECIFICATION】 4 pcs x Track Bottom Roller; Weight of Bottom Roller：15 pounds； Size of Bottom Roller：7.3 x 4.72 x 4.72 in (185 x 12 x 12 mm) 2.75'' 7cm Color: Black； Material: 50 Mn Steel； Surface Hardness: HRC52-60； Deepth: 5-10mm； Finish: Smooth； Technique: Forging and Casting； 【EXCELLENT PERFORMANCE】 Wheel body Wheel body forged from 50Mn round steel with good hardenability. The heat treatment process ensures its strength and wear resistance. The two-piece roller shell rims are heat-treated for increased body strength and longer wear life. Roller Shaft Roller shaft and bearing designed to carry and turn with heavy track weight forged and heat treated for strength. The bearing surfaces are hardened and polished to reduce friction and wear. Center flange absorbs side thrust from roller shell. Bronzed Sleeve Bearing Design provides a large surface area for better load distribution. Soft bronze coating in the bearing absorbs any small foreign particles before they can damage the shaft and seals. Cast Iron Bushing Cast iron bushing supports the bronze sleeve bearing. It is cast from iron to absorb loads without permanent deformation. 【REST ASSURED OF QUALITY】 This Track Bottom Roller is factory p-roven. We will be responsible for dealing with them if the product has any quality problems within 1 year.