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 | dgexpres
Join Date: Posts: 1 
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2001-11-22 33341
can someone tell me how hours are calculated. I suppose it was dumb of me to reason that if the engine ran for 60 minutes, that would be one hour, but not so.
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| Roger L.
Join Date: Jun 1999 Posts: 0
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2001-11-22 33342
Well, don't feel all alone; that clock tricked me in exactly the same way. But on mine it turns out that if you run for one hour at the rated PTO speed - usually about 2700 RPM - then you will add one hour to the clock. If you run for an hour at only half that RPM you will only add half an hour to the clock. Keep in mind that the tractor tach/clock are not high precision instruments...even when compared to an inexpensive wristwatch. ....
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| Bird Senter
Join Date: Jun 1999 Posts: 962 
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2001-11-22 33345
My '95 Kubota B7100 hourmeter was nothing more than an electric clock. It was keeping time any time the key was on - whether the engine was running or not. Conversely, of course, if you turned the key off you could continue running the engine while not registering anything on the tach (which of course I wouldn't do because you would be turning off the electrical system, not charging the battery, etc., but it was possible).
My '99 Kubota B2710 is as Roger described. It registers one hour in an hour if the engine is running at "PTO speed" and less than that at lower rpm. Aircraft hourmeters with which I was familiar worked the same way; one hour at "cruising" rpm.
I have learned that some tractors stil have one kind of hourmeter, and some have the other. ....
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| MarkS
Join Date: Posts: 1
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2001-11-22 33346
My 95 Cub Cadet had a mechanical hour meter which was driven by engine RPM, while my New Holland TC40D appears to be an actual clock that is independant of engine RPM. I guess it just depends upon how the manufacturer decided to track running time. ....
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| TomG
Join Date: Feb 2002 Posts: 5406 Upper Ottawa Valley 
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2001-11-23 33351
My mid-80's Ford works like Roger describes--a combination of rmp and time. The manual describes it as a 'smart clock.' Maybe I should feel challenged by my tractor. Some older clocks only went to 999 hours. I guess these clocks were intended to keep track of maintenance and were before clocks came to be thought of as used-tractor buyers’ guides. In that case, I guess the 3-place clocks shouldn't be called 'proof meters.' Maybe they were smarter than some buyers though. ....
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 | Art White
Join Date: Jan 2000 Posts: 6898 Waterville New York
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2001-11-23 33355
Just to help you boys out a little. The old tractor's tach ran the hours at PTO speed. That means if PTO speed is 1800 and you are running the tractor at 900rpm you could run the tractor for two hours before one hour would show. The bulk of the new tractors do run one hour for one hour on an electric tach. ....
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