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  1. J

    Komatsu PC78 hydraulic thumb question

    Just finished installing a hydraulic thumb but I can only get it to move one way. I can't find anything in my op manual about selecting single or two way functions. I just find a bypass selector valve which routes oil through a secondary filter for single way breaker operations. I have this...
  2. J

    Checking aux hrdaulic pressure relief

    I got a service manual for my machine and was looking through it. I am going to be installing a hydrualic thumb and will want to make sure the pressure relief is set right. I didnt see anything about it in the manual. Has anyone done this before? Machine is a 2004 komatsu pc78mr-6
  3. J

    komatsu pc78mr-6 leaking final drive...

    Looks like one of my final drives leaks when parked in a certain spot. It looks like its seeping on the outside between the cap and the housing. It has three plugs in it, one of which has to be aligned with a part of the housing to fit. It looks like there is a snap ring holding the cap on...
  4. J

    Komatsu PC78MR-6 throttle question.

    I just unloaded my 2004 PC78 and it will not throttle up. The guy who sold it to me said it just started doing that when he went to load it. He had used it a couple days earlier and it worked fine. He has been a standup guy and I do not doubt him. He said it blew the fuse for the motor...
  5. J

    Pin on vs weld on hydraulic thumb...

    Is there really a big difference in using them? The excavator I bought is plumbed but does not have a thumb... I will be putting one on asap. The pin on thumbs are quite a bit more expensive... around $3700 for a Werk Brau one, the excavator has a 30" WB bucket on it. And I see Usa...
  6. J

    Komatsu PC128uu... any good?

    I am looking for an excavator for farm use. Mostly tiling and small clean up jobs. I have found a few in good shape. Are they any good? I think this model is a grey market one, but I was told i would have no problems getting parts or service. It is a 1996 model and the only problem the...
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