setting tractor at 1900 for max torque and not over running engine.
setting pto speed correctly for max work but not over speed and damaging equipment.
so if you.. run a shredder or mower, hay baler, or anything off the pto, you need the tach to set the rpm to 540.. The tach will then tell you which gear you can run under load or if you need to gear it down while staying at 540 pto speed so the cutter or baler will work correctly. If you have a pump or especially a pto generator.... on and on and on. If you plow or heavy load the tractor the tach is useful again for setting the rpms correctly around 19 to 2000.
Again, seeding or fertilizer, the ground speed it critical to settings and that comes off the tach.
Post hole digger is about the only pto implement that you DONT run fast at pto speed.
There are a lot of "cowboys" out there that have only one speed... wide open... They are the ones who constantly destroy plows, planters, and twist off pto shafts out there. I do a lot of business with them. Everything is destroyed including ring gears to engines.. Again.. no tach is needed.
Farm equipment is generally made to operate at 3 to 5 mph..
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Today's Featured Article - It Can't Be Done! - A Tractor Story - by Neil Campbell. I'll never forget the time back when I was a boy baling hay on our Farm in Big Rapid, Michigan. The most memorable event that took place was a trip up the steepest incline on the farm pulling an old New-Idea baler with a pony-motor for power and a haywagon. I had just talked my Dad into buying an old John Deere B with 6-speeds ahead and I was real proud of it, except it was a little smaller than the Case tractor that we normally
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