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  1. fireman9731

    Section for komatsu d20,21 and similar grey market dozers

    Luckily I was able to figure out the wiring today without a diagram and now I’m back in action. I also found a worn spot in wire going to the temp sending unit, I’d say that is the culprit for the random temp gauge pegging. I’m also working on another flush. I plan to run it most of the day...
  2. fireman9731

    Section for komatsu d20,21 and similar grey market dozers

    I’ll try another flush for a longer time. Couldn’t hurt anything.
  3. fireman9731

    Section for komatsu d20,21 and similar grey market dozers

    Well the saga continues... Got the new water pump put on, pulled the radiator and gave it a thorough washout, got everything put back together, and it still runs a little hot but it never gets to boiling over. Every once in a while the temp gauge will spike then cool back down (which might be a...
  4. fireman9731

    Section for komatsu d20,21 and similar grey market dozers

    Its clean as a pin on the outside. The inside looks pretty good to me. There is a little rust on the filler neck but everything else is clean and if I drain it, the cores empty as fast as the rest of it. The coolant that was in it was pretty crudy. It took several flushes to get clear water out...
  5. fireman9731

    Section for komatsu d20,21 and similar grey market dozers

    No luck on the over heating issue. It will stay at the top of the green just sitting but as soon as its under load its hot. If it let it sit and run at about 1/3 to 1/2 throttle it will slowly cool down. I guess a water pump is the next thing to change. Its circulating coolant but I guess not...
  6. fireman9731

    Section for komatsu d20,21 and similar grey market dozers

    Just got my service manual emailed from Tool King. You are correct, they call it a damper case and it should contain 1.5 liters of oil. I'll try to pickup a temp gun and go from there.
  7. fireman9731

    Section for komatsu d20,21 and similar grey market dozers

    This is the torque converter right? Should it be empty? By looking at it, I would guess there is some oil in there. There’s seepage around the lower bolt holes. No way for trans oil to get in there but I’m sure engine oil could end up in it. Would that contribute to overheating?
  8. fireman9731

    Section for komatsu d20,21 and similar grey market dozers

    The hydraulic cooler looks good. This machine really is in good shape for its age. Doesn’t look abused at all. The hydraulic cooler does seem to warm up pretty quick just sitting there. Is that normal? Fluid is right at top of full mark. I think I’m going to check the trans screen next to see if...
  9. fireman9731

    Section for komatsu d20,21 and similar grey market dozers

    I'm running straight water right now, still flushing it out some. The belt is tight, It was a little loose before but its tight now with no improvement. Fan blows outward. Radiator is clean on the outside. Seems clean enough on the inside, when I drain it, the cores drain too, no visible crud...
  10. fireman9731

    Section for komatsu d20,21 and similar grey market dozers

    Anybody have any advice for the overheating problem?
  11. fireman9731

    Section for komatsu d20,21 and similar grey market dozers

    New member here, and I finally finished reading the whole thread. What a great resource! I recently purchased a D21p-5. Its in pretty good shape for its age. Working hour meter shows 608. I'm sure its not original but the machine seems to be very lightly used. Undercarriage shows very little...
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