Posted by showcrop on May 26, 2015 at 08:34:02 from (66.31.196.130):
We got the snowmobile club groomer in my shop to address some issues. The big one is that it appeared from the alignment of the rear wheels that the walking beam bushings were gone. Well, after removing the track, we could see that it was way off. The beam is about thirty inches long and it is off about an inch and three quarters in just that distance. it is chewing those two rear tires fairly badly. The beam has roller bearings instead of bushings and they are in good shape. The problem is that the shaft that the beam mounts on is bent, apparently where it comes out of the reinforced part of the box frame. This crawler is built backwards in that the drive sprockets are on the front instead of the rear, so all of the force pulling it and the drag behind it are pulling on the rear wheel and on that walking beam. We can see that the gussets reinforcing the shaft are not original, and there has also been reworking done on the assembly above the walking beam that the track rides on as it comes forward, and which also mounts the upper end of the shocks. My question is about straightening the shaft. We were thinking, as the other guys and I talked, that we could cut the gussets, put a persuader on the shaft and bend it back, and re weld the gussets. Then I got to thinking later, that the shaft, which goes all the way through the machine, and sticks out twelve inches on each side, and is One and three quarters inches diam., must be heat treated. If it is heat treated won't it be significantly weakened by heating and bending? perhaps it has been hardened by another process as well.
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