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  1. #1
    New Member
    Join Date
    Jul 2013
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    9
    Location
    campobello sc
    Tractor
    mf 4610.jd 5325

    Default ground speed

    I have a mf 4610 tractor which has no speedometer only tach. the operator manual only list ground speeds for tractors with 16-9-30 rear tires. my tractor is equipped with 18-4-30 tires. can anyone tell me how to determine ground speeds with this rear tire?

  2. #2
    Gold Member Winmac's Avatar
    Join Date
    Dec 2011
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    340
    Tractor
    Landini 6860

    Default

    Multiply the listed ground speeds by 1.047, this is based on the difference in the rolling circumference of standard ag tires.

  3. #3
    New Member
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    Jul 2013
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    9
    Location
    campobello sc
    Tractor
    mf 4610.jd 5325

    Default Re: ground speed

    thank you for the information.

  4. #4
    Super Member Gary Fowler's Avatar
    Join Date
    Jun 2008
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    9,520
    Location
    Bismarck Arkansas
    Tractor
    2009 Kubota RTV 900, 2009 Kubota B26 TLB & 2010 model LS P7010

    Default Re: ground speed

    OR easier still, just take your GPS unit and a note pad. Operate the tractor in each gear, noting the GPS ground speed and write it down. You can even make a spread sheet at various RPM for each gear and then laminate it and put it on your tractor. Years back, the farm tractors came with a dash chart showing the various speed of each gear at certain RPM. I haven't seen them on any CUT or Utility tractors though.
    2010 LS P-7010C 20F/20R gear tractor & FEL, 2009 Kubota B 26 TLB, RTV 900 Kubota,17 foot Lund boat with 70HP motor, 2012-20 ft 12k GVW trailer, 2011- 52" Craftsman ZTR mower, 2013 Ferris Zero Turn, 3 weed whackers, pressure washer, leaf blowers, 7 foot bush hog, 8 foot landscape rake , 8 foot 3 PH disc, 2 row cultivator, 350 amp Miller AC/DC welding machine and all the tools needed to keep them all repaired and running.

  5. #5
    Super Member Mace Canute's Avatar
    Join Date
    Nov 2006
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    6,194
    Location
    Saskatoon, Saskatchewan

    Default Re: ground speed

    Quote Originally Posted by Gary Fowler View Post
    OR easier still, just take your GPS unit and a note pad. Operate the tractor in each gear, noting the GPS ground speed and write it down. You can even make a spread sheet at various RPM for each gear and then laminate it and put it on your tractor. Years back, the farm tractors came with a dash chart showing the various speed of each gear at certain RPM. I haven't seen them on any CUT or Utility tractors though.
    Great idea! And for those people without a GPS unit but who have smartphones there's probably an app that will give you a speedometer function.

  6. #6
    Silver Member wolfpack2's Avatar
    Join Date
    Dec 2004
    Posts
    227
    Location
    SE Michigan
    Tractor
    JD 4520

    Default Re: ground speed

    Maybe this will help.

    ground speed-ground-speed-chart-jpg

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