More shielding in the PTO and gear box area. I believe the 550 has all feed rolls versus the upper apron assembly that the 50 and 55 had. Early 55's had a 4 lug LH wheel while later production had 6 lug. 50's had cast iron knife holders while 55 and 550 had steel. I just saw a pretty good 55 sell a week ago today at auction. 130 dollars with both hay head and 2 row corn head. I bid it up to 100 dollars but just was not a need with a 50 in the shed not getting any use. Anybody that has any 50 or 55 parts I would be interested.
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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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