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Thread: Help to identify 6.75 vs6.91 track pitch?

  1. #11
    Join Date
    Dec 2018
    Location
    Lacrosse, Washington
    Posts
    24

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    Thanks for your help, I will do some counting of sprocket teeth and see what I find. Not sure how I ended up with a small fleet of them but they keep following me home, the last three(2 9uís And a jimmypillar 4R) weíre headed to scrap and I felt obligated to save them. Always good to have your own personal parts supply when farming with such old equipment

  2. #12
    Join Date
    Aug 2008
    Location
    Paso Robles, CA
    Posts
    973

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    I don't believe there was every sprocket segments for the 6.75 track.

  3. #13
    Join Date
    Nov 2006
    Location
    Corralitos, Ca.
    Posts
    14,745

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    Looked up Lacrosse, Wa.....population of 313 in 2010...and in the middle of nowhere....good reason for all the spares!!!

  4. #14
    Join Date
    Dec 2018
    Location
    Lacrosse, Washington
    Posts
    24

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    Ha, ha, yes pretty sparse population up here, lacrosse is my address but I am actually 20 miles out of town. Easy to keep peace with the neighbors when they are a couple miles away! Did some looking today and it appears all of my D6ís have 28 tooth sprockets and 39 link chains. Is it a problem to run the 6.91 pitch links on 28 tooth sprockets? The one 9u that I just got has nearly new undercarriage with this combination, I do not see any unusual wear patterns. Is a D5 98J supposed to have 39 link chains? Donít have a correct parts book for that one yet. Thanks

  5. #15
    Join Date
    Nov 2006
    Location
    Corralitos, Ca.
    Posts
    14,745

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    6.91" and 6.75" undercarriage is not compatible. Along with the different pitch bushing diameter for the 6.75 is 2.12" and 2.31" for the 6.91" for the D5/D6. The mis-matched version may work but expect accelerated wear.
    The 98J base is 38 link with standard front idler, 39 link with large front idler.

  6. #16
    Join Date
    Dec 2018
    Location
    Lacrosse, Washington
    Posts
    24

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    Got a chance to look over the D6B that I was hoping to use the 9U tracks on. It is definitely still 6.75 pitch links, possibly the most worn out I have ever seen. Measuring across 5 pins I am at 28 inches, probably a little more if I was to drive it around enough to wear the rust off of things. 4708A20C-9580-4D72-B7D1-4CBE9F429B15.jpg05B44306-3532-417D-89A9-C22A6C21BF99.jpgSince the 9U has 6.91 chains and 6.75 sprockets I guess I still need better 6.75 chains and sprockets or possibly 6.91 sprockets for the D6B. Will D5 sprockets fit on a 9u or D6B? A couple pics of the D6B

  7. #17
    Join Date
    Nov 2006
    Location
    Pittsford NY
    Posts
    4,469

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    Just curious - does the a/c do a good job cooling and filtering day after day in that cab?
    Cheers,
    Neil.

  8. #18
    Join Date
    Nov 2006
    Location
    Corralitos, Ca.
    Posts
    14,745

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    The same 5S0726 sprocket hub (segmented) used on the D5 (6.91") fits the 37A, 44A, 4R, 5R, 8U, 9U.
    Also the same 5S0834 adapter weld on ring for segments.
    Last edited by Old Magnet; 06-19-2019 at 10:55 AM.

  9. #19
    Join Date
    Jan 2009
    Location
    Colorado Springs and Waitsburg WA
    Posts
    947

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    Quote Originally Posted by Mschwartz View Post
    Got a chance to look over the D6B that I was hoping to use the 9U tracks on. It is definitely still 6.75 pitch links, possibly the most worn out I have ever seen. Measuring across 5 pins I am at 28 inches, probably a little more if I was to drive it around enough to wear the rust off of things. 4708A20C-9580-4D72-B7D1-4CBE9F429B15.jpg05B44306-3532-417D-89A9-C22A6C21BF99.jpgSince the 9U has 6.91 chains and 6.75 sprockets I guess I still need better 6.75 chains and sprockets or possibly 6.91 sprockets for the D6B. Will D5 sprockets fit on a 9u or D6B? A couple pics of the D6B
    From what it looks like that sprocket has a pitch length shorter than the rails.
    John Liebermann
    2 9U's, 5J, IHC544, Ford860, (All working farm tractors)
    cojhl2@gmail.com

  10. #20
    Join Date
    Sep 2009
    Location
    Asotin, Wa
    Posts
    2,088

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    Quote Originally Posted by Neil View Post
    Just curious - does the a/c do a good job cooling and filtering day after day in that cab?
    Neil, while I canít comment directly on Mswartzís tractor, generally cabs on ag Cats can be hit or miss.

    It all depends on how theyíre set up, and it seems no two are ever quite the same. The lighter ďtinĒ cabs are usually very rattly and shaky. The summer fallow regions of the pnw get very, very dusty in the summer so any relief is welcome. In my D6C you would get a little dirty but nothing like being without a cab. My heater and ac works great, it will run you out if you let it. Where the cabs really helped, at least in my opinion, was in the early spring or later in the fall. Itís nice and toasty, although noisy, in the cab. Plus youíre out of the wind.

    I started driving Cat at age seven and we didnít get a tractor with a cab till I was 14. I still seeded with a open cab tractor up until 2009 or so. Iíve ate my share of dirt, but Iíd rather be out in the summer time versus being cold. We would wear insulated coveralls and then tie sack strings around our pant legs to keep the cold from blowing up into you legs. Good times.

    BP.
    Holt 45 power unit, Two Ton, Sixty (2), Diesel 40, No.11 AutoPatrol, 4G D4, 9U D6, 17R D6C, 9G D7, 7M D7, DW20.

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