Go BottomTractor Hours
 | cinerex
Join Date: Jul 2003 Posts: 9 Virginia 
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2003-05-03 54222
Ok, here's a basic question from a first time tractor owner: How are hours calculated? Do the hours indicated the amount of time the engine has been run, or the amount of time the wheels have turned (like an odometer)?
regards & thanks in advance;
gary
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 | DRankin
Join Date: Jan 2000 Posts: 5116 Northern Nevada 
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2003-05-03 54224
On my BX it logs hour for hour when the key is turned, whether the engine is running or not.
On my Deere the hour meter reflects how many hours the engine runs at full rated rpm. If I am dinking around at half throttle it takes two hours of running to add up to an hour on the meter. ....
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| cinerex
Join Date: Jul 2003 Posts: 9 Virginia
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2003-05-03 54230
Mark;
Thanks for the info. I have B7500. I wonder which way it logs the hours.
gary ....
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| DRankin
Join Date: Jan 2000 Posts: 5116 Northern Nevada
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2003-05-03 54231
Turn the key on and I bet you hear it clicking. Leave it on and come back in 6 minutes and see if it turned 1/10 hour. ....
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| BudG
Join Date: Feb 2002 Posts: 15
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2003-05-03 54232
I have a B2400 and it works on the engine RPM
Bud ....
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 | Art White
Join Date: Jan 2000 Posts: 6898 Waterville New York
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2003-05-05 54327
Most all new tractors are an hour per hour that the key is on. Old tractors worked for hour per hour of PTO speed. ....
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| boatman
Join Date: Jul 2003 Posts: 49 Idaho
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2003-05-05 54329
On the N.H.TC-30, the "Registration of hours and portions of hours your tractor has operated, will be based on an average engine speed of 1867 RPM. Engine speeds below 1867 RPM accumulate hours at a slower rate than clock hours. Engine speeds above 1867 RPM accumulate hours at a faster rate than clock hours." Per the TC30 Operators Manual. ....
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 | Murf
Join Date: Dec 1999 Posts: 7249 Toronto Area, Ontario, Canada
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2003-05-05 54332
It varies by the manufacturer, as Mark noted, but most now use the electronic type of hours meter instead of the clock mechanism style which was geared off the tachometer style which logs hours based on engine turns, as Art stated.
The mechanical version is based on the concept that an 'hour' was equal to 129,000 revolutions of the engine, being 60 minutes at 2150 rpm, the most common pto speed. This was, IMHO, a much better judge of age, since time putting around, or idling even, is definitely not the same as tilling or heavy bush-hogging for instance.
The main problem with the electronic type is the ease with which they can be defeated or tampered with. A 'big 3' dealer near here was stripped of his dealership recently by the factory after they learned he was unplugging the hours meter then placing them in his rental fleet, at year-end he would then refurbish them and sell them as 'demo units' with only a few hours showing, apparently the cost of refurbishing was way below the depreciation.
Likewise, I met a mechanic from my dealer's place at a local auction last fall, he warned me off of some 'low hour' imported units in the sale, he told me the electronic hour meters had been run forward past zero and stopped at reasonably low hour levels. When I told the auctioneer of the situation, he replied "Prove it!", they sold for very nearly retail values.
Best of luck. ....
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