Track Rollers

Bottom Track Rollers, Track Bottom Rollers


Track Rollers, Bottom rollers carry the weight of the machine and ensure the machine can move over the track. The combination of the height of the integration and the height of the link of the bottom roller determine the elevation of the undercarriage. This means that the end drive, sprocket and idler of the machine are not loaded. The undercarriage of the machine will drop down when the bottom rollers and the track links wear and then the load will be carried by the end drive, sprocket and idler. This means that these parts may break. Excavators, bulldozers and mini excavators use different bottom rollers.

Bottom Track Rollers

NBSJ offers a complete range with its rollers for both excavators and bulldozers from 0.8 to 100 tons. We produce all bottom rollers and top rollers based on OEM specifications. The production is finished on high-tech CNC machinery with precision tools, high-grade seals and bronze bushings (bimetal).

We have designed the bottom and top rollers with reinforced flanges and unique NBSJ seals. We forge high-quality steel using a special method. Heat treatments make the excavator rollers or dozer rollers extra tough and thus wear-resistant. This guarantees a long service life, even with intensive use.

Track Roller Inner structure


Bottom rollers provide for the undercarriage clearance height. The combination of the link height and the installation height of the bottom roller defines the undercarriage height increase. There is consequently no load on the front wheel, the sprocket and the final drive of the machine. When the chain links and the bottom rollers wear, the machine’s undercarriage will drop, so that the load is exerted on the front wheel, the sprocket and the drive motor. These components can subsequently break.

Various different bottom rollers are used for excavators, mini excavators and bulldozers.


Bottom rollers for excavators have a thick axle for bearing the machine’s weight These bottom rollers have a smaller running surface diameter, because the machines do not need to do much mobile work.

Bottom rollers for mini excavators have the same characteristics as the bottom rollers of larger excavators. However, these bottom rollers have more types of mountings in the undercarriage, depending on the type and the tracks used.

Bottom rollers for bulldozers have a large running surface, because they do mobile work. Various different types of flanges are mounted alternately to better guide the track link. The bottom rollers have a larger oil reservoir, so that the roller can be cooled sufficiently.

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