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  • Finding a Special Seal

    Seeking help from the braintrust here....

    A while back I fairly carelessly bashed some large seals out of my Clark C20B forklift. Grease/dust seals for the final drives. They are still usable but 60 years old and have seen better days. I'm trying to find new ones, but turning up blanks. The forklift parts people suck and won't even return an email to allow me to return some that are wrong.

    Dimensions are:
    • Hub ID: 8.131
    • Hub OD: 8.747
    • Seal ID: 8.125 Nom
    • Seal OD 8.750 measured
    • Width: .395
    It's a little bit different than a standard oil seal. No metal housing, standard rubber lip with spring, but also has a hard rubber sharp edged lip to keep dust out. No idea where to get that other than trying another forklift retailer. I don't see it in the catalogs. I'd have to machine the sealing surface down to 7.9375 to fit readily available seals.

    Any suggestions, I'd appreciate them.

    Thanks,
    MB
    21" Royersford Excelsior CamelBack Drillpress Restoration
    1943 Sidney 16x54 Lathe Restoration

  • #2
    Got a part number? These might be them-

    https://www.ebay.com/itm/30280065521...hoCj3oQAvD_BwE
    I just need one more tool,just one!

    Comment


    • #3
      Forklifts have the most crack pipe engineering I have seen.
      Worse than the dashboard designs in cars. (well almost).
      In my head, I am almost picturing a giant U-cup seal, like a
      big hydraulic cylinder would use. Sounds expensive.

      -D
      DZER

      Comment


      • #4
        Originally posted by wierdscience View Post
        Got a part number? These might be them-

        https://www.ebay.com/itm/30280065521...hoCj3oQAvD_BwE
        Looks right. Sadly, isn't. That's what I already bought. Massive, like 14" in diameter, for an 8k lift I think.
        21" Royersford Excelsior CamelBack Drillpress Restoration
        1943 Sidney 16x54 Lathe Restoration

        Comment


        • #5
          Click image for larger version

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          Click image for larger version

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          Click image for larger version

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          Click image for larger version

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          Complete with shag carpet of the same vintage!

          Seal is 20.541 according to the book. Whole lotta good that will do you unless you're a better searcher than I!
          21" Royersford Excelsior CamelBack Drillpress Restoration
          1943 Sidney 16x54 Lathe Restoration

          Comment


          • #6
            Have you tried these guys? They were very helpful when I needed an replacement control card for a 1980s Drexel forklift: https://www.liftpartswarehouse.com/

            Comment


            • #7
              Static seal or dynamic seal?
              Seal oil in or dust out ?
              Pressure involved?
              Type of fit?

              -D
              DZER

              Comment


              • #8
                Originally posted by Doozer View Post
                Static seal or dynamic seal?
                Seal oil in or dust out ?
                Pressure involved?
                Type of fit?

                -D
                Dynamic Grease in, dust out
                Zero
                Came out with one hammer blow to the gear behind it that I did not realize was pressing against it. Drops right over the hub, though it should have about 5 thou fit I believe.
                21" Royersford Excelsior CamelBack Drillpress Restoration
                1943 Sidney 16x54 Lathe Restoration

                Comment


                • #9
                  Geeze - what an oddball huge diameter that's for sure,,,

                  All I can add is all the internal springs can be "adjusted" tension wise --- just remove and "unscrew" and then snip a "certain amount" off of the female end - then screw back together and install back into seal - "if" the seal is not cracked and still pliable it can create a situation that will re-seal for years to come... (depending)

                  Comment


                  • #10
                    I'm sorry to say this is the first thing I thought of when I read your thread title (yes I know he's a sea lion)Click image for larger version

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                    • #11
                      Everyone wants someone special.

                      First time I've heard of someone wanting a special seal, though.

                      Comment


                      • #12
                        Could you substitute wool felt cord?

                        -D
                        DZER

                        Comment


                        • #13
                          I assume since you didn't include a part number which is generally located on the seal you either can't read it or can't find the number. Either way you will have to get lucky to locate a proper seal. I had a similar situation awhile back in that the seal (with a part number) wasn't available anywhere. That is until a HSM member that is a guru with part numbers crossed it to a NAPA seal number which I got at my local NAPA store. If you can locate a part number I'll pass it onto him and see what he can do. Ron
                          Last edited by nc5a; 06-13-2022, 09:08 PM.

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                          • #14
                            You might consider Chicago Rawhide /SKF as a resource - Not sure what National Seal has
                            The spring is known as a "garter" spring
                            Since your need is basically a dust/dirt application ( and not high hydraulic pressure) you should check out Split Seals
                            For seals on a 8 inch shaft, you generally see a 10" OD , but the split seals look like your picture and you can cut it to fit, and it uses a garter spring for 360 radial pressure

                            Stock Seals ---The closest I can see is a CR 79302 to fit your 8.750 bore , but it is rated for a 7.938" shaft
                            The fact you have no metal ring is good, and just maybe you could use a O Ring or make a Urethane Round Belt (welded & 3/8 size) to work

                            https://www.skf.com/binaries/pub198/...198-318140.pdf

                            Rich
                            Green Bay, WI

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                            • #15
                              Find a seal matchning your shaft and machine a ring to adapt to the od.

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