I have brochures for the JD 30 Series tractors and the latest one is dated 76-11. They all mention that the Roll-O-Matic was available for the 4030 & 4230 Tractors. The next year when the 40 Series came out there is no mention of it in the brochures so I would say that is when Deere dropped the option from their line. The single front wheel was also available on these 2 tractors. Actually, when you ordered a 4030 or 4230 with something other than the standard wide-front you got a tractor with a split pedestal just like you had on a 3020 or 4020. You could then swap the front ends around just like you could on the 10 or 20 Series.
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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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