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  1. Jonathan Wurz

    Cat 938G rough shifting transmission

    No, noise is the same as far as I can tell. 8 Gallons No, this would be impossible since the tube is outside the trans case. I meant to say everything inside the transmission that is under suction. I was just going to replace the tube until I saw the price. ($897) I might still but I'll try...
  2. Jonathan Wurz

    Cat 938G rough shifting transmission

    That is the suction tube, it does have new o-rings but I didn't know that the tube has been updated. I added a bunch of oil, and I am pretty sure there is no suction leak INSIDE the transmission. I measured the height of the oil when it was running and it is high enough to cover everything...
  3. Jonathan Wurz

    Cat 938G rough shifting transmission

    No, the noise does not go away after the bubbles disappear. I also just realized that the bubbles only disappear in the sight glass. This should have been obvious. Since the tractor is sitting in one spot with nothing to move new aerated oil into the sight glass, the bubbles just float to the...
  4. Jonathan Wurz

    Cat 938G rough shifting transmission

    Will check this now.
  5. Jonathan Wurz

    Cat 938G rough shifting transmission

    So if this would work, does this indicate that everything in the control valve is working properly?
  6. Jonathan Wurz

    Cat 938G rough shifting transmission

    Yes I did, I replaced the relief valve so unless I messed something up it should work fine, but the P3 pressure only goes down to spec after it is heated up to 180 degrees. I have been trying to confirm or disprove my theory of the oil foaming from being sprayed through the relief valve at 200...
  7. Jonathan Wurz

    Cat 938G rough shifting transmission

    So you don't think its possible the oil would aerate if it sprays into the top of the transmission through a relief valve?
  8. Jonathan Wurz

    Cat 938G rough shifting transmission

    Cat dealer Reman P# 20R-6494
  9. Jonathan Wurz

    Cat 938G rough shifting transmission

    I'm Baaaaaaaack! So I've got a long winded story today. Last thing I did was replace the trans pump bushings. I guess I shouldn't have done that, because after starting the tranny pump screamed and then stalled the engine. I didn't realize at the time what actually happened, although it should...
  10. Jonathan Wurz

    Cat 938G rough shifting transmission

    I've had the loader running for the past 4 days now, but I didn't want to post anything before running it for a couple of hours. THE ROUGH SHIFTING IS FIXED! I believe the differential valve was what fixed the speed changes. The aerated oil is still aerated, with one change. Before, after...
  11. Jonathan Wurz

    Cat 938G rough shifting transmission

    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.
  12. Jonathan Wurz

    Cat 938G rough shifting transmission

    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...
  13. Jonathan Wurz

    Cat 938G rough shifting transmission

    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?
  14. Jonathan Wurz

    Cat 938G rough shifting transmission

    So now I can buy 1 for the price of 2
  15. Jonathan Wurz

    Cat 938G rough shifting transmission

  16. Jonathan Wurz

    Cat 938G rough shifting transmission

    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.
  17. Jonathan Wurz

    Cat 938G rough shifting transmission

    It takes about 2-3 minutes to go from 60 PSI to 0 PSI
  18. Jonathan Wurz

    Cat 938G rough shifting transmission

    So I've been pressure-testing the gear pump and I might have something. I plugged the inlet and outlet ports and I have a tire stem in the inlet plug. When I put 60 psi into the pump I can hear air leaking in the bell housing. (The transmission is separated from the motor.) Is this normal or...
  19. Jonathan Wurz

    Cat 938G rough shifting transmission

    I was thinking SAE30 to see if there's any change and then trying the TMS TDTO if there is none. Your thoughts on the TMS now?
  20. Jonathan Wurz

    Cat 938G rough shifting transmission

    Got it out, thanks
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