Cone Crusher Countershaft Bushing

What is cone crusher countershaft bushing?

A cone crusher countershaft bushing is a part of the equipment that is typically made of bronze or other high-grade materials. It is designed to support the main shaft of the cone crusher and provide a stable bearing surface for the transmission of power and rotational motion.

The countershaft bushing is positioned in the center of the mainframe of the cone crusher, and it is fitted onto the countershaft that rotates inside it. The main shaft, in turn, is supported by the countershaft bushing and rotates at a high speed, crushing the material that is fed into the cone crusher.

Over time, the countershaft bushing can become worn or damaged due to the intense pressure and friction that it experiences during the operation of the cone crusher. This can lead to reduced performance and increased maintenance requirements. It is important to regularly inspect and replace the countershaft bushing as needed to ensure that the cone crusher operates efficiently and effectively.

How to remove countershaft bushing?

On occasions when a bushing becomes worn and replacement is necessary, the bushing will be loose in the box. In instances such as this, the bushing is simply slid from the box without difficulty. Due to the extreme limits of manufacturing tolerances, the countershaft bushings may have had a slight interference fit within the countershaft box. If such is the case, removal will be more difficult. To replace the countershaft bushings that have such a press fit or those that have «seized» in the box because of a build-up of heat due to inadequate lubrication or from overloading the Crusher, proceed as follows:

1. Remove the countershaft box from the main frame and the countershaft from the countershaft box.
2. Construct a steel centering plate.
3. Slide the narrow portion of the plate through the bushing until the plate is behind the bushing as shown. Turn the centering plate 90° so that the outer edge of the plate will bear against the bushing.
4. While holding the plate in position, thread a 25 mm (1″) diameter rod into the nut which is welded to the center of the plate. The rod must be a few inches longer than the bushing and threaded on both ends.
5. Place a 25 mm x 75 mm x 305 mm (1″;x 3″ x 12″) steel bar over the other end of the rod and hold it firmly in place with a hex nut.
6. Insert a long timber or pipe through the opposite end of the countershaft box and ram against the centering plate. Should the bushing remain tight within the countershaft box, the following alternate method utilizing a jacking procedure is suggested to remove bushings.
7. Using the same centering device as previously described and in the same manner, except for a much longer rod and steel bar, place wooden blocking between the steel bar and the countershaft box flange.
8. Using the threaded rod as a jackscrew, tighten the hex nut until the flange of the bushing is pulled against the steel bar.
9. Unscrew the nut and place additional blocking under the bar and tighten the hex nut until the bushing is again pulled against the bar.
10. If necessary, repeat Step 9 until the bushing is free.

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