The carrier roller excavator, which is also called carrier roller or top roller, is one part of undercarriage parts for crawler heavy equipments such as excavator, bulldozer, crane, drilling machine etc.
Excavator carrier roller excavator is made of roller body, shaft, collars, Bi-metallic Bearings and seal group. It is made by forging, machining, heat treatment, assembly, painting etc.
The quality and working life depends on the quality of raw steels, the hardness of rail surface, the depth of hardness layer, the quality of seal group etc.

The carrier wheel is located above the X frame, and its function is to maintain the linear motion of the chain rail. If the carrier wheel is damaged, the track chain rail will not be able to maintain a straight line. The carrier wheel is a one-time injection of high-quality oil.

It can be replaced with a new one. During the work, try to avoid the rollers being soaked in muddy water for a long time. Usually, keep the X-frame inclined platform clean, and don't let too much dirt and gravel accumulate to hinder the rotation of the rollers.