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Identify Part for 977L

Discussion in 'General Industry Questions' started by MLewis70, Jan 12, 2019.

  1. MLewis70

    MLewis70 New Member

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    I need to know what this part is. The local dealer said it is 7K-9375 and referred to it as a pin. Its the part my finger is actually on.
     

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  2. DB2

    DB2 Well-Known Member

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    Pin boss ?
     
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  3. bam1968

    bam1968 Senior Member

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    According to my parts book 7K-9375 is the part number for that pin. Best I can tell where your finger is at is part of the arm and bearing assembly which would be 7K9851 and 7K9852. Which is basically the whole loader arm. That's the way I see it in my parts book for s/n 11k6971 and up. Hopefully someone will chime in if I'm wrong.
     
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  4. Nige

    Nige Senior Member

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    Might I ask why you are looking for this part..?
    Also can you take a photo from a bit further away in order to give context.
    A machine Serial Number would also help.
     
  5. bam1968

    bam1968 Senior Member

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    Nevermind post #3. I looked at your pic again and I don't see anything in my parts book for the piece your finger is on. Sorry, my bad.
     
  6. Bluox

    Bluox Senior Member

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    6K7200 frame assembly .
    Bob
     
  7. MLewis70

    MLewis70 New Member

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    Thanks for your response. The serial number is 11K8654 and if you will review the new pic you will see that over time it has gotten so that the inside piece is no longer held tightly in place which makes the arms and bucket shift
     

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  8. MLewis70

    MLewis70 New Member

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    Please keep in mind, I am trying to track down the piece for the owner of the machine and I actually do not operate it at all, so please try not to get too technical in your responses.
     
  9. Nige

    Nige Senior Member

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    Now the problem is obvious. In fact there is a far easier solution than to try to replace the piece you are pointing to in the photo of your first post. It is a process known as line-boring. Basically a piece of equipment is used to machine the hole so that it is clean and of a consistent diameter but oversized. At this point in time it is most likely somewhat oval in shape. Then the bore is welded internally to reduce the internal diameter until it is undersized, then finally is it machined to bring it back to the specified size for the pin to fit without that huge gap shown in your 2nd photo.

    The part you are pointing to is actually part of the complete front frame of the machine, Item 8 in the illustration below. Even if a front frame could be found you wouldn't want to be considering a frame replacement to fix the problem on that machine, line boring is far more simple.

    upload_2019-1-12_18-16-31.png
     
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  10. kshansen

    kshansen Senior Member

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    I was a bit confused at first looking at the two pictures until I realized that one was from the left side of the machine and the other from the right side of the machine.

    Welding and line boring would as other have aid be the best solution.

    That said if the wear is as bad as it looks in the second picture I'm thinking there will be more damage than what you can see right now. That kind of wear did not happen in the last week.

    I would have to wonder if any of the pins and bearings in that bucket linkage are worth reusing! But I guess it all depends on why and what this machine is expected to do and for how long.
     
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  11. Welder Dave

    Welder Dave Senior Member

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    I can't really tell but does the pin turn in that pin boss and is bolted on the inside on the loader arm to keep it in place? The boom cylinder on my backhoe is like that. If the pin turns in the pin boss or even if it doesn't and there is a similar pin boss on the other side (should have a replaceable bushing if the pin turns in it). I think it would possible to weld new pin bosses on and line them up with a new tight fitting pin. It's a short distance between the loader frame uprights and would be considerably cheaper than welding and line boring. If the other side is worn, I don't know if there would even be enough room to set up for welding the bore prior to line boring. It would take some careful measuring to make sure it lines up the same before tacking the pin bosses in place but I think is very possible to do. That may be why the pin boss looks to have a separate part number. I can't tell but it may even go through a hole in the upright that would make it easier to line up a new one.
     
    Last edited: Jan 14, 2019
  12. StanRUS

    StanRUS Senior Member

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    Simple Borewelding and Lineboring repair back to original specifications of 2ea bores in alignment +/- 0.002 per inch.
    Nominal Price $100.00 per inch diameter X bore length

    Walkin Machine Shops charge $200-$300.00 per hours.

    New PINS required purchased from OEM, Cat classic or Non-OEM aftermarket. Or repaired via submerged arc welding with self hardening wire (used for crankshaft welding-repairs) and regrinding; often a service offered by local Cat dealers but pricey.
    Small diameter boring bar (capacity 5" diameter) will clear the 977 dashboard, I think.
    HL1.jpg
     
    Last edited: Jan 14, 2019
  13. Welder Dave

    Welder Dave Senior Member

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    I think it depends if there's someone in the area that has the right equipment and doesn't charge ridiculous prices. I heard of a lot guys getting told it's hundreds and even thousands to get line boring and welding done especially if they're out in the boonies. The field rate for dealer service here is over $160/hr.
     
  14. StanRUS

    StanRUS Senior Member

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    Dave,
    Older track loaders are typically a can-or-worms with all of the bores, pins and links worn out including the bucket. Repairing ALL will cost thousands exceeding the value of the machine in most cases. Little usage of a farm? I sell employees' time, LOL.

    OP's 977, probably wouldn't boreweld; instead machine the 4 bores for press fit hardened steel bushings and use carbide drill for drilling the pin lock bolt holes.

    Closest Cat dealer rate for portable machining is $120.00 hourly plus zone, travel time, tax on labor, supplies etc. No one hires per hourly rates except gov's...All per bid priced jobs, even sub'd to dealers doing their lineboring jobs, LOL
     
  15. Welder Dave

    Welder Dave Senior Member

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    Does the pin turn in those in those bosses? It seems there should be a bushing in them that could be replaced unless it's just wallowed out from lack of grease on the arm and the pin was turning when it shouldn't be.
     
  16. StanRUS

    StanRUS Senior Member

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    Pin is slip flt into loader frame bores and non rotating. Lift arms have hardened bushings and receive grease through the pin's drilled orifice.
    977.png
    #12 2ea bushing, 1 per each side of the loader lift arms.

    Pin and Loader Frame has bolt hole for retaining the pin and preventing rotation of the pin.
     
    Last edited: Jan 15, 2019
  17. Nige

    Nige Senior Member

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    For a farm machine press-fit mild steel bushings would also be an option........ however I don't see anywhere above where the OP indicated what the actual or proposed use of the machine was.
     
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