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Message: <blockquote data-quote="873skid" data-source="post: 141202" data-attributes="member: 18885"><p>So sorry to hear.  I had that happen on my 2001 873 in 2011.  The main sprocket broke off one of the rear axles.  The mechanic at Bobcat dealer said it was only the second time in 20+ years of working on bobcats that he had seen that.  Very expensive repair.  The machine was used quite a bit (better than 1/2 the time) with metal tracks over tires on steep rocky and wooded terrain.  When the tires would get worn down and spin in tracks we would tighten the tracks probably more then they should have been.  We figured a combination of this and just having the tracks on probably put extra stress on the sprocket.  I replaced both rear sprockets and chains while the machine was torn apart.  The machine had about 1800 hrs. at the time and now has 3400 hrs. and no sign of problems. I haven't run the tracks near as much since then only when in tough environments. The old 873 has gone into retirement with me so it isn't used as hard anymore.</p></blockquote><p></p>