The bigger alternator makes more amps at low RPMs. That's the main reason why many new autos come with 150 amp alternators. It's not to make 150 amps. It's to make 50 amps at engine idle speed so when stopped at a traffic light or stop sign - and the AC and stereo and headlights are on (and other loads) -the thing keeps charging.
Farm tractors often have different pulley ratios then cars and the alternators often run slower. So a tractor with a lot of electrical loads can benefit a lot from a larger alternator. All depends on what you want to do. We had a Deere tractor with a 37 amp alternator at the shop. The farmer was trying to run a 8 row corn planter with it and each row drew 7 amps of power. I.e. 56 amps all the time. We had to stick a Leece-Neville 160 amp alternator on for him.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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