Head As. 6E4978/9T3052/121-3397/172-9981 Track Type Tractor Caterpillar 14H, 14H NA, 14M, 16G, 16H, 16H NA, 16M, 446B, 446D, 928H, 988G, 988H, D6H XL, D6R, D6R II, D6R III, D6R STD, D6T, D6T LGP, D6T LGPPAT, D6T XL, D7H, D7R, D7R II, D7R XR, IT28G Centershift Cylinder Bore 101,60 Stroke 479,60 Hydraulic Cylinder 6E-4978/9T-3052/1213397/1729981