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  1. #1
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    American Belgian team

    Default Ground speed question

    I have a Jinma 284 that I am wanting to use with a new(to me) pasture spray rig. I need to know what my ground speed is in order to calculate the dosage of chemical per acre. The jinma tach has a speed scale on it in kilometers per hour.
    Does anyone know what gear this is based on? Converting from kph to mph is no problem once I know what gear its' based on. The difference between 4mph to 10 mph with everything else equal can be threefold in chemical applied so I want to get it right!

  2. #2
    Super Star Member Diamondpilot's Avatar
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    Daleville, IN
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    Jinma 254/284 Ford 861 Powermaster at work

    Default

    I would use a gps ot a gps app for your phone and actually drive the tractor across the pasture to see what is comfortable.

    You need a spead that keeps you from getting bucked off the seat and the spray rig in one piece.

    Chris

  3. #3
    Platinum Member pjbci's Avatar
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    Summit. Ms
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    JD 4840, 450j, 310, komatsu D31px22, IH 1486, MF 135, MHF TO35

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    If you dont have a gps, just measure off 528 ft or 1/10th of a mile. Time it in the gear and the rpm's that you will be spraying at and do the math. Gps would be much simpler tho especially if it shows mph in tenths for a more accurate application of chemical.

  4. #4
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    Default Re: Ground speed question

    Quote Originally Posted by pjbci View Post
    If you dont have a gps, just measure off 528 ft or 1/10th of a mile. Time it in the gear and the rpm's that you will be spraying at and do the math. Gps would be much simpler tho especially if it shows mph in tenths for a more accurate application of chemical.
    Now that you guys mentioned GPS , I do have a handheld unit. I'll give it a try.

    Still would be nice to know what Jinma had in mind when they put those kph markings on the tach.

  5. #5
    Elite Member RonMar's Avatar
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    Port Angeles WA
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    Jinma 284 delivered 06/28/05

    Default Re: Ground speed question

    Well with the GPS, you will be able to try different gear combinations and see if one gets the tach scale to agree with actual speed I havn't read/heard about any correlation between a particular gear and the speed scale...
    Ron

  6. #6
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    Default Re: Ground speed question

    Quote Originally Posted by RonMar View Post
    Well with the GPS, you will be able to try different gear combinations and see if one gets the tach scale to agree with actual speed I havn't read/heard about any correlation between a particular gear and the speed scale...
    Good idea Ron. I will report back with that correlation if it exists. I kind of think it will be based on one of the high range gears as I understand these tractors often double as road transportation in China..

  7. #7
    Elite Member RonMar's Avatar
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    Jinma 284 delivered 06/28/05

    Default Re: Ground speed question

    Oh, instead of using a GPS, which I own, but didn't think of either, I installed a magnet on the inside of a rear wheel rim on my garden tractor and installed a cheap digital bike speedometer. This worked very well to setup a speed appropriate to my spray nozzles and pump pressure on my tow behind spray rig...
    Ron

  8. #8
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    Default Re: Ground speed question

    OK, the data is in. I used my handheld GPS to verify.

    High range 1st gear at 2,000rpm gives me 4mph ground speed; about as fast as I want to go with the FEL mounted spray rig on rougher pasture areas.

    And, the answer to the rpm/kph per the tachometer face is as I thought. The kph markings correlate to High range, 3rd gear.

  9. #9
    Elite Member RonMar's Avatar
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    Jinma 284 delivered 06/28/05

    Default Re: Ground speed question

    Cool!, thanks for the followup... Now go spray something
    Ron

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