Get the 861, if it has power steering that would be a plus. It will be a little wider, taller and longer than the NAA. A good part of this will be due to the larger tires that are necerssary with more power. We have a 640 which is the replacement for the NAA and had an 861 and 961. The 861 was a powerful tractor in a compact package, and much more useful than the 640, particularily for any significant ground work. A blade on a 640 is noticeably better than a shovel and pick ax. But expect to be working a long time to get anything done, and if the ground is the least bit hard, plan on purchasing a plow to loosen the soil.
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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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