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Cat 938G rough shifting transmission

Discussion in 'Wheel Loaders' started by Jonathan Wurz, Oct 23, 2021.

  1. Nige

    Nige Senior Member

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    Replacement pump time I think, or repair your existing pump. There appears to be a Reman offering Part Number 20R-6494 available. Price parts vs Reman maybe.?
     
  2. Jonathan Wurz

    Jonathan Wurz Well-Known Member

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    The price for reman is $1130 and the parts I've got now are $660 but there are only two bushings. I'm not sure if the other two are the same or if it's a different P/N that I can't find.

    upload_2023-1-24_13-30-3.png
     
  3. Jonathan Wurz

    Jonathan Wurz Well-Known Member

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  4. Nige

    Nige Senior Member

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    If you are looking at the 6Y-4614 Pump Gp there should be a total of 4 x 3T-2094 Bushing, 2 in each half of the case.
    Two bushings are listed as being part of the 6Y-4615 Body, and the other two as part of the 6Y-4621 Cover.

    What you have listed above is fine provide that the Body and Cover are both in good condition and with no wear or damage. Try pricing the pair of them, worst case scenario, and see where that leads. Remember that the Body and Cover already include the bushes you you won't have to price them twice.
     
  5. Jonathan Wurz

    Jonathan Wurz Well-Known Member

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    upload_2023-1-24_15-42-22.png
    So now I can buy 1 for the price of 2
     
  6. Jonathan Wurz

    Jonathan Wurz Well-Known Member

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    upload_2023-1-24_15-50-25.png

    So these are the specs from my service manual, but I can't find anything for clearance between the gear teeth and the pump body. Is this something that never wears enough to check?
     
  7. Nige

    Nige Senior Member

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    If either the gears or the pump body is worn it ought to be immediately obvious because the surfaces of both will resemble a ploughed field.
    Question: If you decide to replace the 4 bearings are you sure that you have the necessary tooling to do the job.? If the new ones are not correctly installed you could be in for a seized pump rather rapidly.
     
  8. Jonathan Wurz

    Jonathan Wurz Well-Known Member

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    The pump body and the gears don't seem to have any wear that I can see without using a micrometer to check clearences.
    I'm not sure which tools I would need to install the bushings. My plan was to turn an oversize shaft down to size with my lathe to fit in the bushing and leave a shoulder at the top. I can then use this tool to press the bushing in with a hydraulic press. I am sure I have the tools to measure how far I need to press them into the pump.
    I might be missing something, but I can't see any other tools I would need to install them.
    I'm not quite sure how to get the old ones out though.
     
  9. Nige

    Nige Senior Member

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    TBH I'd just throw a Reman pump into it and have done with it.
     
    512high likes this.
  10. Jonathan Wurz

    Jonathan Wurz Well-Known Member

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    Might happen eventually but right now I've got the bushings out and I'm waiting for new ones. I can't see any damage that I could point to when asking for a new pump. Thanks for the help, I'll keep you posted.
     
    512high likes this.