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    I just bought an old Coats tire machine. I got a good deal on it, and even in its present condition is very useful for breaking down tires. But the shaft in the middle that rotates the iron is broken. Apparently it has been repaired before, or an attempt was made, anyway. I haven't had a chance to do much with it or take many pics because today was the season opener at the local track and I'm on a pit crew. I don't know what material this is made of, so I'm not sure where to start. I'll post some pics as soon as I take some, but how would you proceed with repairing this?

    Dave
    Still building my new old truck - see the progress!
    http://www.ford-trucks.com/forums/65...-coe-idea.html
    http://www.hobartwelders.com/weldtal...ad.php?t=27017

    Square Wave TIG 200 - Woot!
    MM180
    SP125+

  • #2
    Have you talked with a local tire shop?....They could have an old machine like yours you could get for parts....or they can tell you were they get parts for them from.
    George W. Bush saving your butt whether you like it or not!
    If there must be trouble let it be in my day, that my child may have peace.
    Thomas Paine
    Fear is temporary, regret is forever
    HH210 w S.G.
    Victor/Uniweld O/P
    Dewalt Chop Saw

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    • #3
      You might try these guys-- http://www.autoess.com/CoatsRepairParts.htm You might even be able to get a manual for it. http://www.autoess.com/CoatsParts.htm
      Last edited by mudbug; 04-20-2008, 09:43 AM.

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      • #4
        Tig it with 420 stainless

        You do have both peices no ?
        30 degree V-cut's nearly to meet in the middle......

        fixture it till abought 70% done....
        remove and finnish keeping str8 as you go.

        vg
        sigpicViceGrip
        Negative people have a problem for every solution

        Comment


        • #5
          Originally posted by vicegrip View Post
          You do have both peices no ?
          30 degree V-cut's nearly to meet in the middle......

          fixture it till abought 70% done....
          remove and finnish keeping str8 as you go.

          vg
          Thanks Phil! That was kind of what I was thinking, though I didn't know what filler. I'll have to go over to my buddies house to do it, I think. He's got a PT225 that will probably just laugh at this.

          If I can fix it, I have to believe it'd be less expensive than buying a new part, although I may have to replace the threaded tube. It is worn through on one side so that only the threads remain. Then again, for the use it'll get from me, it might be okay.

          Thanks for the info. The manual link was very nice.

          I'll still post some pics when I get some taken.

          Dave
          Still building my new old truck - see the progress!
          http://www.ford-trucks.com/forums/65...-coe-idea.html
          http://www.hobartwelders.com/weldtal...ad.php?t=27017

          Square Wave TIG 200 - Woot!
          MM180
          SP125+

          Comment


          • #6
            Well, I didn't get any useful pics, but...

            It looks like there are some pieces that are either missing or are missing. Or they're missing. What appears to have happened is that the shaft was supposed to be inserted into a gear. There are also supposed to be some bushings at the top and bottom of the threaded sleeve it rides in. However, the bottom of the shaft was welded to ?. The lack of bushings also led to the wear-through on the threaded sleeve. I'll have to look at it some more when I'm able to disassemble it. Anyway, that's about all I can report until I can take it apart. It looks like it should be easy to fix, even if I have to replace the shaft.

            I'm not sure, but it looks like the sleeve part is part of a bigger piece. Again, I'll have to take it all apart to find out for sure.

            Dave
            Still building my new old truck - see the progress!
            http://www.ford-trucks.com/forums/65...-coe-idea.html
            http://www.hobartwelders.com/weldtal...ad.php?t=27017

            Square Wave TIG 200 - Woot!
            MM180
            SP125+

            Comment


            • #7
              After getting some of the grease off of the shaft and getting a closer look at it, I now have a better idea what's going on. The shaft had been broken in the middle before. It was either welded back together or the lower half was replaced with a different rod. Either way, the alignment was apparently not very good because it looks like somebody had to do some grinding to get it close. The bottom of the original shaft is missing as is the drive gear for it. I'm not real worried about the shaft because I can make a new one, but I guess I'll have to get a new gear. Otherwise, other than some wear and signs of having been outside for a bit, everything appears to be okay. I'll have to replace the rubber, of course, but I'd probably do that anyway.

              As promised, here are some pics.









              Dave
              Still building my new old truck - see the progress!
              http://www.ford-trucks.com/forums/65...-coe-idea.html
              http://www.hobartwelders.com/weldtal...ad.php?t=27017

              Square Wave TIG 200 - Woot!
              MM180
              SP125+

              Comment


              • #8
                we did some work to this one, need to fix a couple more things. We must have missed a brolen weld, we patch the frame a little and R&R the valves, they were sticky. I like the link, saved it.
                http://www.facebook.com/cary.urka.urkafarms

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                • #9
                  Originally posted by Sberry View Post
                  we did some work to this one, need to fix a couple more things. We must have missed a brolen weld, we patch the frame a little and R&R the valves, they were sticky. I like the link, saved it.
                  Cary, looks like you have an awfully short photographer.

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                  • #10
                    Dave, did ya ever get it fixed? Looks like it broke in one of many repaired sections of the shaft. I would guess 4130 chromolly for this. Stainless may be OK for tensile, but this is torque stress. Great pictures. I'd prolly try to build a new one, if ya can't buy it.

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                    • #11
                      Actually, I finally got around to calling the place that Mudbug linked. The shaft is $145 and the pinion gear is $69. I'll buy the gear, but the shaft I think I can make on a friends lathe.

                      Dave
                      Still building my new old truck - see the progress!
                      http://www.ford-trucks.com/forums/65...-coe-idea.html
                      http://www.hobartwelders.com/weldtal...ad.php?t=27017

                      Square Wave TIG 200 - Woot!
                      MM180
                      SP125+

                      Comment


                      • #12
                        Like a number of things a tire machine is something I should have looked harder and shopped more than I did to find one in better condition. Lots of moving parts and fixtures on one including valves and plumbing. A guy should hydro the air tank if he could. There is a reason you find good deals, they long since paid for themselves back in the day. Mine earns its keep even limping along. I would probably buy the shaft, I would likely buy the parts unless it was something I could do fast and easy, no point in standing in front of a lathe for a day plus source the materials, etc. Made that mistake more than once, now my first option is often how much is new especially where machining is involved.
                        http://www.facebook.com/cary.urka.urkafarms

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                        • #13
                          Originally posted by whateg0 View Post
                          Actually, I finally got around to calling the place that Mudbug linked. The shaft is $145 and the pinion gear is $69. I'll buy the gear, but the shaft I think I can make on a friends lathe.

                          Dave
                          Dave:
                          Are you aware that, that shaft will either have to be heat-treated,
                          OR,
                          made from a high-grade Prehard ?
                          At the very least 4140 PH ,to get the strength you need.
                          If you have the dimentions, I could see if there's some
                          Shafting laying around, one of the tool-shops
                          around here, a leader-pin from Superior Die Sets, would work.

                          You won't be able to machine it on a toy-lathe though.
                          Carbide and guts all the way.....the flats too.

                          vg
                          sigpicViceGrip
                          Negative people have a problem for every solution

                          Comment


                          • #14
                            Well, Phil. Thanks. I guess I didn't think that I'd need to heat treat it. Although, I can see where the keyway is and where there is contact, that the pressure would be pretty high. Hmmm... Maybe I would be better buying it. I don't think I'll really use it enough to truly justify the purchase. It's just something that I think of every time I have to mount or dismount a tire. I have one of the HF manual tire changers that I bolt to the deck of my trailer and have been using it for a few years. I know how hard I have to work at it to get some tires to come off the rim, even with lube. I guess I still underestimated the force. Definitely something to think more about.

                            As far as the lathe goes, I have a friend that has a monster in his shop. 'Course, I've never used it for anything bigger than maybe gundrilling a bolt, or turning some dies for the bead roller.

                            Thanks for the advice.

                            Dave
                            Still building my new old truck - see the progress!
                            http://www.ford-trucks.com/forums/65...-coe-idea.html
                            http://www.hobartwelders.com/weldtal...ad.php?t=27017

                            Square Wave TIG 200 - Woot!
                            MM180
                            SP125+

                            Comment


                            • #15
                              Originally posted by whateg0 View Post
                              I have one of the HF manual tire changers that I bolt to the deck of my trailer and have been using it for a few years. I know how hard I have to work at it to get some tires to come off the rim, even with lube.

                              Dave
                              That thing will work you to death!!!!

                              I've got one & let anyone use it(just to watch them sweat) It takes a certain touch to use it & it takes a lot of use to learn that method(more than once in a while).

                              I got it for "just in case I needed it sometime" --NOT-- for all the time.

                              I'd bet that shaft is very hard...you could make it,but it'd need to be hard or heat treated. Not saying you couldn't make one that functions for a home shop,but everyday might require the correct shaft. Call them...they should know if it's heat treated or some special shaft material & would be happy to tell you so(don't tell them you intend to make your own..just ask questions about it's strength)

                              Just had a thought... don't know the size of that shaft,but you might find some oilfield sucker rod to make it out of... Tough stuff in the larger sizes.

                              Good Luck,Dave(yea another one)
                              Last edited by mudbug; 05-16-2008, 11:05 PM.

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