Bulldozer Undercarriage Parts D4H Top Roller Idler Drive Sprocket Track Bottom Roller The function of an idler is to guide the track links into running smoothly and to prevent dislocation,idlers also carry some weight and therefore increasing groud pressure.there is also an arm in the center which supports the track link and guides the two sides.the smaller the distance between the idler and track roller,the better the orientation. Our products are according to the standard of OEM to manufacture.

EX55A Carrier Roller Top Roller Upper Roller Undercarriage Part For Excavator The function of the roller is to transfer the weight of the locomotive group to the ground and roll it on the track. To prevent derailment, the roller should also be able to prevent the track from moving laterally relative to it. Rollers often work in mud and sand, and withstand strong impacts, the working conditions are extremely harsh, and the rim is easy to wear. The requirements for the roller are: the rim is wear-resistant, the bearing seal is reliable, and the rolling resistance is small. Our products are according to the standard of OEM to manufacture.

Top Roller,Carrier Roller EX200-5 9089636/ 9134245/ 9234984 Excavator Upper Roller The drag sprocket is composed of a drag sprocket shaft, a floating oil seal seat, a drag chain wheel body, a drag chain cover, a screw, a floating oil seal, an O-ring, and a tapered roller bearing. Our products are according to the standard of OEM to manufacture.