COLLAR ASSEM. 4M8979 - Caterpillar

Table 1
Part Number Description Bucket Bore Dimension
251-6754 Bushing (Bottom Bucket Pin Bore) 187 0.05 mm (7.362 0.002 inch)
243-3712 Bushing (Top Bucket Pin Bore) 140 0.05 mm (5.512 0.002 inch) Note: Freeze both 251-6754 Bushing and 243-3712 Bushing before installation into the pin bores.Note: The inserts should be pressed into the bore so that the insert is flush with the outer face of the hinge plates. The inserts should not protrude beyond the inside face of the hinge plate.This change is adaptable to the following Large Wheel Loaders.
988G (S/N: 2TW1-UP; BNH1-UP)
988H (S/N: BXY1-UP)