tracks vs tyres

Discussion in 'Cropping' started by Neddy flanders, Jan 7, 2019.

  1. anyone any data on the compaction of a 800 tyre on a JD combine vs 24" wide tracks?

    what is the footprint of each?

    would anyone who has bought a tracked combine ever go back to wheels?
  2. jonnyjon

    jonnyjon Member

    No I wouldn'
  3. Spencer

    Spencer Member

    North West
    Neither would I..
  4. AlfM

    AlfM Member

    Done this for next year so can't compare yet. With the lunatics on the roads it's almost worth it for reduced transport width.
    matthewizod, ollie989898 and Chae1 like this.
  5. solo

    solo Member

    Don't forget the rear axle also carries weight. In those wet seasons it was the back axle that often created some of the ruts.
  6. Brisel

    Brisel Member

    Ground pressure = tyre pressure plus a couple of psi for the tyre rigidity. The ground pressures of tracks are usually in the sales brochures.

    The New Holland CR combine brochure suggests 15 psi pressure with tracks and at least double that with tyres. My old JD was specced with IF 800 tyres and they ran at 32psi.

    There must be some research by Silsoe, Philip Wright, Dick Godwin etc online about tyres vs tracks.

  7. Henry B

    Henry B Member

    We are on our second tracked combine, wheels are obsolete on combines for us.
    s~~t shoveller likes this.
  8. Lincsman

    Lincsman Member

    Its worth remembering ground pressure is calculated on a smooth surface, fields arn't smooth, a track running over a brick on hard soil will crush it into the ground, the so called heavier tyre will deform around it.

    Tracks that dont pivot can be the worst of all worlds for compaction and spot weights.
    snipe likes this.
  9. The biggest benefit from tracks is the stability of the header no tyre bounce and much better control of the header height especially at higher speeds tyres need much higher pressure resulting in higher ground pressure
    The next biggest is road transport width especially with 24inch tracks
    No need to slow down and get off the road for every car
    Road grips round here need to be respected

    Would never go back to wheeled combine unless it is a smaller autonomous multiple vehicle system
  10. marshallfarm

    marshallfarm Member

    Lincolnshire, UK
    We would be tracks bit are restricted to wheels because of hillmaster.. if you don't need a self leveling machine, go tracks
    Chae1 likes this.
  11. Brisel

    Brisel Member

    I've gone from a Hillmaster on tyres to a NH with self levelling shoe and tracks and have no intention of going back to wheels again. Yes, I've lost a bit of output on the extreme slopes but it's worth it IMO.
  12. Brisel

    Brisel Member

    I know this doesn't apply to harvesting, but high torque operations with crawlers can be bad. I've watched a 25 tonne Quadtrac standing on the rear idlers when pulling a 7 leg subsoiler buried to the frame with good grip. Each track gang can pivot a certain amount.
  13. DanniAgro

    DanniAgro Member

    The trouble with this analysis is that the belt/track is assumed to be rigid between the axles, but I remember reading an expert saying that this not true. Depending on the number of rollers between the axles, the track bends up noticeably, meaning that pressure varies greatly as the track rolls over the soil surface. Just watch as one drives by, and the undulations of the track are very obvious.
    And watch a Challenger as it gets to the end of the row and lifts its plough etc up - it rolls back onto the rear axle and soil pressure rises into the tens of bars.
  14. Fuzzy

    Fuzzy Member

  15. s~~t shoveller

    All tracks here.more reliable than tyres so far too as it gives the tyres some stick with large headers.
  16. Fish

    Fish Member

    North yorkshire

    12 mins in tyres v tracks
    B'o'B and Brisel like this.
  17. After this year when whatever you did there was negligible compaction like we had most years between 1975 and 1991

    I am now working to drilling and combining down the same wheelings 1.2 m run on per run or under 4 m run on for each tramline with trailers only on tramlines
    With 24 inch tracks drill tractor could go down to 600 mm wide if we could get the wheels out to 3.4 m maximum width 3.1 m centre
  18. topless_matt

    topless_matt Member

    I have the silsoe report on tyres vs tracks, will find the link to the online version when I’m in the office tomorrow.
    Brisel likes this.
  19. Phil P

    Phil P Member

    North West
    Can’t think of any negatives for tracks really:rolleyes: other than the initial higher purchase cost, think going back to a wheeled machine would be a last resort for me now.
  20. snarling bee

    snarling bee Member

    In the field it is stability, stability, stability. Ground pressure is secondary IMO.
    On the roads round here, with overhanging hedges and traffic calming measures, the effective transport width is no different between wheels and tracks. You have to be very careful with kerbs etc on tracks, whereas on wheels it was full steam ahead.
    ollie989898 likes this.

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