If you buy one get a 4620 or a 4520 that has the 4620 engine. My oldest son was shopping for a 4020 10 years ago and bought a 4520 with the 46 engine instead. The only drawback is the 1000 pto but for us on a dairy farm that was never an issue. We had ours running 170 hp. Ours is parked right now with a clutch issue and should get an overhaul. The late engines had the injection pump ran off the timing gears on the front of the engine rather than the oil pump. Most 4520's had the small injection pumps and parts are getting hard to get for them.Right now I can not locate any pics of mine with the roll guard and canopy. Tom
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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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