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  1. R

    Komatsu pc78mr tracks

    Looking for a used set of 450x81Nx76 tracks for my machine. Don’t use enough for new tracks. Anyone know anybody out there that has a 50% set. On the east coast.
    • RTCPC78
    • Thread
    • rubber tracks steel tracks
    • Replies: 0
    • Forum: Excavators
  2. R

    Where’s the fuse box

    I suspect you have already found this. Mine is behind the left arm rest, just below the arm rest. You almost need to stand on your head to see anything.
  3. R

    Grease for ring gear and bearing?

    Thanks Nige, I come from the paper mill background and we had a mobil product SHC PM 460 that repelled water wonderfully. We put this in all our wetend bearings. The XHP may be better for xtreme high pressures seen in the sear of the gears. I will have to look into the XHP222. Thanks.
  4. R

    Grease for ring gear and bearing?

    skyking, What brand/name grease did you use?
  5. R

    Grease for ring gear and bearing?

    What grease are most using for ring gear and bearing? I found this on my excavator. Drained water and removed as much grease as I could. Manual says NLGI 2 grease. I plan on repacking with 1.5 gal of grease. Just wondering what most are using? Everything seems pretty sealed up, how could the...
    • RTCPC78
    • Thread
    • grease lube ring and pinion ring gear
    • Replies: 8
    • Forum: Excavators
  6. R

    Equivalent Komatsu TO 30 final drive oil

    I would like to get the torqforce 30, but where to buy?
  7. R

    Equivalent Komatsu TO 30 final drive oil

    What is an available oil that is comparable to the TO 30 Komatsu oil. I have heard that some are adding SAE 30 wt oil and my concern is that it doesn't have the proper additives for the shear loads of the planetary gears in the final drive. I have also heard 90 wt gear oil as well. Any advice...
  8. R

    Komatsu PC78MR-6 boom/cab lighting-no power

    I have been looking in my manual and discovered it shows you where all the connectors are on the machine. See attached. You reference the connector number on schematic and then it shows you where it is in the drawings I sent. Very helpful when trouble shooting. In this example you would be...
  9. R

    Komatsu PC78MR-6 boom/cab lighting-no power

    I have this schematic in my manual. Any help in locating the location of the connectors in the run for the lights? I guess it's going to have to be a treasure hunt. I verified that 24V is at the switch and is lighting the computer display, just no voltage to the lights from what I can tell.
  10. R

    Komatsu PC78MR-6 boom/cab lighting-no power

    I am actually trying to add LED flood lights to it. I have checked the wiring to the lights and see no voltage.
  11. R

    Komatsu PC78MR-6 boom/cab lighting-no power

    I am trying to repair the lighting on my PC78MR-6 and have tracked the power to the switch and all is good, power is coming to switch, switch works, display screen lights up, but I have no power coming to any lights on the cab or the boom. Any help in tracking down where the wiring runs for...
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