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    My Komatsu PC50UU-1 Engine swap W/Pics

    Just did the same coupler r&r on my PC40. Not a bad job. At 6500 hours it looked like this. Rubber particles during stater replacement told me it was time for a new coupler.
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    My Komatsu PC50UU-1 Engine swap W/Pics

    Nice work and "can do" inguinuity. Install etc looks clean and oem.
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    Hydraulic Pump coupler R&R komatsu PC40-7

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    Hydraulic Pump coupler R&R komatsu PC40-7

    Well here is what I found. Glad I am changing it out. As you can see the rubber portion of the coupler has separated. Is this a oem coupler? Am replacing with oem. Also found this in my intake. I have always had a airfilter in place. Wondering if this had been there since I have owned it...
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    Hydraulic Pump coupler R&R komatsu PC40-7

    Thank you for the information LACHAU. I have the machine in my shop and am beginning the removal process. Going to remove pump only not entire pump/engine as noted in the provided attachment. Info does help. Will upload pictures once I have the coupler out. I am betting it's pretty worn...
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    Hydraulic Pump coupler R&R komatsu PC40-7

    Thank you for the schematic. I do have the factory parts manual showing the same info. Am looking for process steps to remove and replace. Not sure what to remove or correct steps. Am in need of a repair manual with some detailed step by step info. It's a bit busy as you can see and I'd rather...
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    Hydraulic Pump coupler R&R komatsu PC40-7

    Am looking for repair manual/ info regarding hydraulic coupler replacement. Installed new starter recently and noted buildup of powdery rubber on old stater housing internal to flywheel. Material looked similar to the pile of rubber under my washing machine when the coupler failed. With 6500 hrs...
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    Komatsu question

    Let me dig it up and see.
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    Komatsu pc50 control panel - can they be repaired?

    Any luck getting your panel issues resolved ?
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    Komatsu pc50 control panel - can they be repaired?

    See if your dealer is willing to print one out for you. Mine did for FREE! It helped me alot.
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    Komatsu pc50 control panel - can they be repaired?

    I agree about grounds doing strange things. You wouldn't lose much by cleaning all ground wires you can find and as mentioned running a separate ground for the cab to the machine frame. At least you could rule that out. Cab or open machine? Do you have a schematic of how the buzzer circuit...
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    Komatsu pc50 control panel - can they be repaired?

    The buzzer on the machine I mentioned was under the operators seat.
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    Komatsu pc50 control panel - can they be repaired?

    Could it possibly the ignition switch? I know they have several leads going to them. When starting the machine, the "warning" buzzer beeps, does this go on and off intermittently also? If your having a intermittent failure with the gauges maybe its somehow related to the ignition switch which...
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    Komatsu pc50 control panel - can they be repaired?

    Are you sure your instrument panel is bad ? Do quick check with a an ohm meter and see if your wiring harness is providing any input to the panel gauges. Fuses good and panel securely plugged in and connection is clean?
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    PC40-7 Wiring harness fried

    Seems as though this is great forum, but no one has been too willing to reply sooooooooooooooo. I want to share that I was able to get all my gauges working and and now have a perfectly functioning machine. I was able to verify that the harness did provide input to the gauges (after repairing...
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    Komatsu starter problem

    You need to get a service manual.......................in English.
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    Diagnostic procedure for fuel/ temp / and alarm buzzer on Komatsu PC40-7

    As posted earlier I had a short in my wiring harness that required me to remove and repair the harness. All functions now work correctly with the exception of my temp , fuel gauge and warning/start up buzzer. I have verified that each item is receiving power to from the harness yet they do not...
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    Komatsu question

    I have both the operators and parts manual in printed format. I'd be happy to provide any specific info your after. Don't have them at the moment, but beyond max lifting capacity what else are you interested in? What is your machine's S/N ???
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    PC40-7 Wiring harness fried

    180 views and no replies ? Well here is an update. I was able to repair the old harness. My dealer quoted me $1200 and approx 90 days for a replacement harness which was not exactly correct for my S/N Machine. I was able to remove the old harness (which was no fun) and replace the burnt...
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    PC40-7 Wiring harness fried

    I am a new member here that found this site while searching for some info on my excavator. This is my first post. I am hoping to learn more about repair and maint of my equipment, and now I have a little issue that I need to resolve. I have a 96 Komatsu PC40-7 excavator I use on my property. My...
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