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John Deere Tractors Discussion Forum
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720 fan/governor problem

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BLinWMi

09-11-2007 20:57:43




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Brought the 720 in today to change fluids before silo filling commences. Got everything changed and started it to pull out, when I noticed there was no power steering. I had drained and refilled ps unit, so I gave it a minute to kick in and it never did. Got off the tractor and noticed the fan was absolutely still. I can turn the fan by hand while the tractor is running. I got it back in the shop and tore the sheetmetal off but have yet to get any deeeper into it. Any ideas as to what could have let go? When turning the fan by hand, the fan shaft is turning. I just can't imagine what could have broken just from starting the diesel. And did find out why the tach hasn't worked since I got it, the entire tach drive shaft in the gov is MIA. Seen at the parts yard the other day that some 720s had a nylon gear and others had metal gears. Any idea what type would be used when, or in which serial number tractors? Thanks guys

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Mike M

09-12-2007 06:13:35




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 Re: 720 fan/governor problem in reply to BLinWMi, 09-11-2007 20:57:43  
You might have a fan shaft splined coupling let loose. I thought all of those had plastic tach gears ???

Not a good idea to play with the fan while the engine is running !!! What if it started to drive again !!!!

I could see where it may just let go if it was worn and especially if not decompressed when it is shutting down that flywheel and fan and all in between bang violently back and forth on that last compresssion stroke.

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