Key Characteristics
Listed are the key characteristics of an elevated sprocket roller frame.
The track roller frame is separated into two sections: the front roller frame (1) and the rear roller frame (1). The front roller frame section has a large tube assembly, which telescopes (slides) into the rear roller frame.
There are four major bogies (2) that consist of sealed and lubricated cartridge pins. The front and rear major bogies support an idler and a minor bogie, while the two major bogies in the middle of the roller frame support a minor bogie. A rubber pad is installed on top of each major bogie to control the amount of movement and absorbs shock loads of the undercarriage. Bogies are only used on large machines with elevated track.
The minor bogies (3) support two track rollers. They pivot on sealed and lubricated cartridge pins. Bogies are only used on large machines with elevated track.
The recoil spring (4) absorbs shock from the front idler. The system includes a track adjusting cylinder for adjusting the track tension. The recoil spring and track adjuster are found inside the front roller frame.
The recoil oscillation guide (5) includes a cover with a key that is installed in the rear roller frame. The key is inserted in a groove in the outer diameter of the front roller frame tube to prevent rotation of the tube inside the rear section of the roller frame during operation.
The track guide (6) keeps the track aligned with the rollers, idlers, and drive sprocket.
The pivot shaft (7) connects the right and left rear roller frames, which allows them to oscillate around the pivot shaft.