New sprockets from Cat are listed over $1100.00! My machine is an 86. The C models I think had segments or were optional. The cheapest 1 piece sprockets I priced were about $450.00. The weld on teeth were $125. Cat also has a weld on segment adaptor ring or hub for segments. All are real pricey. $600 plus just for the segments. The new hub for segments is over $1000. There is seals behind the sprocket and the sprocket is on a tapered spline. The guy at Cat said you need about a 30 ton puller to get the sprockets off and then an even bigger press to put them back on. The sprockets were welded vertical up with 7018 after grinding a bit of a bevel on the ring with the new teeth. I could lift the whole machine up and turn the sprockets into position for welding. On the backside (inside) we lifted up the back end of the Cat as high as we could with the hoe and stabilizers. My buddy welded 2 passes while I tried to slowly turn the sprocket a couple inches at a time with the machine running. Very hard to turn smooth but he figured out how the sprocket kind of jumped when he yelled at me to turn it. He made sure to move the rod back to the puddle when the sprocket turned. The weld was done at the bottom and was basically a roll welded horizontal weld. Twice around each sprocket. My leg was getting sore from holding the brake so much. I had to hold it down except when I turned the sprocket every 5 seconds or so. Turned out pretty good considering my buddy was laying under the Cat to do the weld. Probably not something to try if you haven't done a lot of welding in position or roll welding. If the sprocket would have been off would have been way easier and faster for welding because we could lay it flat and put a good pass with 3/16 rods on both sides.I put a chain and boomer on the 2 stabilizers to keep the machine from falling in case a hose blew or something. I also had the hoe down to help hold the machine up. My track frames were pretty straight but I can't seem to get the idlers to line up just right. Having good help to put the new teeth on really helped. Even if I still had my own welding truck, it would be very hard to line everything up and hold it by yourself. It was kind of wierd doing the sprockets. On one side we put the ring over the hub and it was all out of wack. Turned the ring about 1/2 a turn and everything measured OK. We took a measurement from the front, back and top of the thick plate the final drives bolt to and then turned the sprocket and took measurements again. Easy to cut out the tacks if it's off but a pain to cut the whole thing off if it was wrong. We took our time to make it as straight and true as possible. It could have been a lot worse. Changing undercarriage is a big job. Dave
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