Allis Chalmers HD9 H Bulldozer for sale. This machine is powered by a Detroit Diesel that runs good and strong. It drives forward and backward fine, the steering clutches work as they should. The left rear drive sprocket is worn and two guide wheels on the same side are also worn badly. These will need attention as the left track will come off If you operate it on a side hill. This is a 23,000 pound machine. It will push a mountain. Tracks are in good shape, bushings are all relatively tight and the pins all seem sturdy still with only minimal wear.