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  1. #1

    Join Date
    Aug 2003
    Posts
    15
    Location
    west central florida
    Tractor
    yanmar 1510

    Default tach and hour meter


    hi tractor people
    just wanted to know if anyone has checked there hour meter to see if it regestered the right time running, i checked mine and when it said it had been running an hour ,it was realy an hour and fifteen minuits,would this also through the tach off ,maby it is metric time,lol

    have a good day today and a better one tomorrow

  2. #2
    Platinum Member
    Join Date
    Nov 2002
    Posts
    944
    Location
    MS
    Tractor
    John Deere 4110 HST

    Default Re: tach and hour meter

    That only tells the correct time if you are running at about 2300rpm, the place the red line in on the meter. If you are running slower speed on the tach, it will not show the correct time. Or if you are running faster rpm, it won't show the correct time. And it may not be perfect, or could be off a little, but generally not too much, or at least not enough to really matter. It sounds to me like you weren't running the right rpm to be off that much.

  3. #3

    Join Date
    Aug 2003
    Posts
    15
    Location
    west central florida
    Tractor
    yanmar 1510

    Default Re: tach and hour meter


    thanks for the reply,it sounds like you are right

  4. #4
    Epic Contributor Bird's Avatar
    Join Date
    Mar 2000
    Posts
    37,219
    Location
    Texas

    Default Re: tach and hour meter

    Larry, of course Dick's right, but it just depends on which kind of hourmeter the tractor has; some have one, some the other. And it's not even consistent within a particular brand.

    For example, I had a 1995 kubota B7100 with an hour meter that was simply an electric clock that ran anytime the key was turned on. That gives a pretty good indication of the time the tractor has run, but no indication at all of how many revolutions the engine had made; i.e., what rpm the engine had been running at. And since the "kill" switch worked by pulling the throttle lever all the way back to shut off the fuel, it would have been possible to kill the engine, leave the key on, and leave the hourmeter running (one of our forum members once mentioned leaving his on overnight, I believe). On the other hand, it would also have been possible to turn the key off, thereby stopping the hourmeter while the engine continued to run (of course I think you also would not be charging the battery if you did so).

    Then I had a 1999 Kubota B2710 with the other kind of hourmeter. It was dependent upon the rpm the engine is running (as yours apparently is). It would register an hour in an hour running at PTO speed, but if you ran it at half PTO rpm, it would only register 30 minutes in an hour. And since turning the key off killed the engine (electric solenoid to shut off the fuel), the hourmeter could not be as easily fooled as with the clock type.

    Personally, I prefer the latter type.

  5. #5
    Epic Contributor Soundguy's Avatar
    Join Date
    Mar 2002
    Posts
    47,155
    Location
    Central florida
    Tractor
    ym1700, NH7610S, Ford 8N, 2N, NAA, 660, 850 x2, 541, 950, 941D, 951, 2000, 3000, 4000, 4600, 5000, 740, IH 'C' 'H', CUB, John Deere 'B', allis 'G', case VAC

    Default Re: tach and hour meter

    Too bad tractors don't incorporate both methods.. a mechanical tach/hourmeter.. and an electrical one just counting 'up-time'.

    The difference between the two gives you a real idea of tractor usage ( close times mean the tractor was run at rated speed most of its life.. like as for a stationary power unit.. etc.. )

    Soundguy

  6. #6

    Join Date
    Jul 2003
    Posts
    264
    Location
    Rocky Mountains
    Tractor
    JD790

    Default Re: tach and hour meter

    Most light airplanes have both a "Hobbs" electric clock (starts/stops on oil pressure) and a Tachometer clock (which was equal to clock time at cruise power - I think). Differences were about 10-15 percent or so. We billed airplane time based on Hobbs time, but maintenance intervals were based on Tach time (per the FAA).

  7. #7

    Join Date
    Aug 2003
    Posts
    15
    Location
    west central florida
    Tractor
    yanmar 1510

    Default Re: tach and hour meter

    THANKS AGAIN TO YOU ALL FOR THE REPLYS,I AM LEARNING A LOT.

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