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Tractormeter terminology

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Brian

07-25-2001 19:10:09




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The tractormeter on my 1960 MF35 indicates hours at 1580 RPM. I just bought another from a salvage yard off a slightly newer (1963) MF35 and on its tractormeter it says hours at 1875 RPM. Both tractors are gas, but what is the significance of measuring the hours at a higher RPM? It seems that the tach was re-callibrated to measure work at a higher level..... I'm just curious. Thanks. The tractormeter is identical except for this.

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ferrell freeman

07-27-2001 05:32:16




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 Re: Tractormeter terminology in reply to Brian, 07-25-2001 19:10:09  
The tach you have and the one got are they driven by the alternator or generator ,then the pulley size determons the RPM reading.



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Brian

07-26-2001 08:22:42




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 Re: Tractormeter terminology in reply to Brian, 07-25-2001 19:10:09  
Thanks guys..... ..I just wanted a clearer understanding and certainly don't need to be that precise in the kind of work I do with tractors.



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Tyler(WA)

07-26-2001 07:39:57




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 Re: Tractormeter terminology in reply to Brian, 07-25-2001 19:10:09  
The hour meter on a tractormeter is only an estimation based on a conversion of RPM to hours at the expected working RPM of the tractor. If you run your tractor slower, the hours will be short of actual runtime. If you run your tractor faster, the displayed time will accumulate faster.

You are correct that later tractors ran at a higher working RPM and therefore the conversion factor was changed.

If you are interested in real engine hour measurement (though I wouldn't know why) you can buy realtime clocks that run off the ignition.

The whole purpose for the engine hours meter is to set maintenance schedules. Pretty close is usually good enough.

I switched my generator for an alternator and lost the conection for my tractormeter. I'm still looking for an electronic tach to mount in the same hole as the tractormeter but I want one to at least look close to the original.

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Ron

06-22-2003 05:46:34




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 Re: Re: Tractormeter terminology in reply to Tyler(WA), 07-26-2001 07:39:57  
I have a 65 MF and just converted it to Alternator.
Did you ever find a Tach to replace your tractormeter?
Thanks
Ron



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Gaither Tucker

10-12-2003 07:23:47




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 Re: Re: Re: Tractormeter terminology in reply to Ron, 06-22-2003 05:46:34  
I have converted my MF35 to alternator and would like the tractometer to work. Did you ever find anything that would work? Thanks!



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Dave

07-26-2001 05:12:11




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 Re: Tractormeter terminology in reply to Brian, 07-25-2001 19:10:09  
On the Ford 8N-1952, hours are calculated at 1580 rpm too. I know that newer tractors use higher rpm, perhaps it is closer to real working situation. On the 8N, the standard pto of 540 rpm is around 1580 motor rpm. On IH 574, 685, 540 pto rpm is at 2150 motor rpm and the hourmeter is calibrated close to that speed if my memory is good.
Dave



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