Quick Question about CTLs

Discussion in 'Heavy Equipment & Pavement' started by grassman222, Mar 16, 2011.

  1. grassman222

    grassman222 LawnSite Member
    Posts: 178

    Whats the difference between the CTLs that have the drive sprocket straight up from the lower one . For example a Takeuchi or Gehl compared to a komatsu ? I was told what the difference was but i cant remember what the answer was.
  2. stuvecorp

    stuvecorp LawnSite Fanatic
    Posts: 5,215

    I was told the Takkie's(and sister versions) sprocket is like it is so the track is in contact with the sprocket more.
  3. bobcat_ron

    bobcat_ron LawnSite Fanatic
    Posts: 10,101

    Something to do with power, some kind of triangle and torque values, God only knows, but more contact with the sprocket is a good start.
  4. Digdeep

    Digdeep LawnSite Bronze Member
    Posts: 1,840

    It's a bunch of marketing mumbo jumbo.

    Contrary to what some OEMs will tell you, pretty much 80% of the torque/force used to drive a sprocket forward is only on two teeth/sprocket segments....regardless of whether you have a "high drive" machine, or 180 degrees of track wrap around the sprocket such as with a track loader or an excavator. All more "track wrap/contact" will do is spread out the other 20% over more sprocket teeth/segments.

    Almost 90% of the torque/force is on one sprocket tooth/segment when in reverse..hence one of the primary reasons that wear/cost is increased in reverse.
  5. Tigerotor77W

    Tigerotor77W LawnSite Bronze Member
    from Germany
    Posts: 1,891

    Quoted for truth.

    Edit: Oh -- I should add, though, that there may be other benefits. The ride could potentially be affected by sprocket placement, and debris could be shed easier with one design vs. other. As far as power transfer, however, that really isn't an issue regardless of the relative positions of the sprocket and rear idler.
  6. grassman222

    grassman222 LawnSite Member
    Posts: 178

    o ok , i could remember . a friend of mine has a komatsu and i like it but i ran a takeuchi the other day and that one seemed to push the pile alittle better . i dont know . i geuss its whatever i like in the end right? Thanks everyone for the info keep it comin
  7. grassman222

    grassman222 LawnSite Member
    Posts: 178

    i geuss more sprocket contact would be better for pushing but i have no idea
  8. stuvecorp

    stuvecorp LawnSite Fanatic
    Posts: 5,215

    It wouldn't surprise me if it was all marketing 'mumbo jumbo'. :)

    I feel the TK machines would be much better having the track extended backwards...
  9. Digdeep

    Digdeep LawnSite Bronze Member
    Posts: 1,840

    You are absolutely correct...it comes down to the one that best fits your needs. Much of the "pushing the pile better" that you feel is a function of traction force through the sprocket to the track, track surface on the ground, track tread design, machine weight and engine hp.

    I have a formula for traction force in my classroom and I'll post it tomorrow. It's important to remember that traction force is only a calculation and does not always translate into more traction due to the other factors that affect traction...track length, weight distribution, tread design, soil conditions, etc.
  10. AWJ Services

    AWJ Services LawnSite Platinum Member
    from Ga
    Posts: 4,276

    Every brand has it's own different positives and negatives. What you will find is that all will be productive overall with each one being a little bit better in one situation and weaker in another.

    Find one you like and are comfortable in and thats the best choice.

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