I may be wrong on this but I think the 504 International and Farmall Tractors replaced the 340 series tractors. The 340 followed the 60 series[460-560-660]into production. The 504 Series followed the 06 series [706-806-1206] series into production.That said I "think" the 06's & the 504's went into production about 1966-67.Why your propane tank is stamped 1961 I don't have a clue.Maybe your Tractor was converted with parts from an older unit,maybe the tank was in storage a long time before being needed.Advertising pictures of the 504 pulling a 4/14" #60 Plow are not representative of the tractors ability. It was basically a 3/14" Plow tractor on most midwest farms.The 504 was an excellent little tractor on a 7' Sickle Mower cutting hay,raking hay,running a baler,pulling wagons etc.and the International model made a good loader tractor or one to pull a 6' brush cutter with.Many,many Jobs these Tractors were capable of doing and doing in class .JH
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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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