I'm not a dozer expert, although I have put a lot of hours on my little 420C. I was internally debating whether to fix my dozer or scrap it - the track chain is pretty worn. I have a friend who is a retired dozer operator/mechanic. He looked at it and pronounced it fit for repair. He said that those little Deere dozers with the rock guards will NOT jump a track off unless they are sloppy loose. His exact words were, "That little tractor will outlive you if you fix it!"
I notice that your 420 is missing the rock guards - hopefully they are stuck back somewhere waiting to be put back on.
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Today's Featured Article - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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