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  1. N

    LED Screen Question for Kobelco SK200 LC Mark IV

    Update; OK, I am an idiot. The three screw on connectors contain light bulbs (traditional light bulbs not LED). One was out and all three had a blue condoms on them - probably to disburse the light and not make a bright spot. I found the 24V bulbs at Auto Zone and removed the condoms...
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    LED Screen Question for Kobelco SK200 LC Mark IV

    Serial number YQU4681 My led screens on the screen monitor are very dim and hard to read. I did a search and on later models, there was a screw that can be adjusted to brighten the screen. I took the monitor apart and cannot find the screw adjustment for this older monitor. The back (see...
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    Kobelco SK200 LC

    Thanks Kyle! I will try switching the items above and see what happens. In requards to the "Kobelco Special Wire Harness" needed to do Adjustment A - if I knew it was just two wires and a momentary switch, I would have saved the $250 and made my own. The back light is dim on the monitor...
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    Kobelco SK200 LC

    Working on it tonight. Mechanic (#4) is very knowledgeable as he works for a large equipment company doing repairs. He thinks it is servo / valve related. The valves we have taken out so far, had sat for along time, were sticking and had a small amount of surface rust. We are taken them...
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    Kobelco SK200 LC

    Update; The rebuilt pump was put on today. The valve body located between the pump and the hydraulic tank had two valves stuck. They were cleaned and put back. Now the swivel, boom lifting, boom extension and right side track work at normal speed. The left track and the bucket remain slow.
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    Kobelco SK200 LC

    No, which may be the problem. Putting the hyd pump back on this morning. Then, I will take the linkage off (per the instructions and try again. Thanks.
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    I wish I would have checked before buying

    So, I picked up the hydraulic rebuilt pump today (for the Kobelco Excavator) and mentioned to the older gentleman that I was looking to buy a bulldozer. I told him that I hope I don't see him again as that would mean I purchased another "project" with potentially a bad pump. I was ten...
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    Kobelco SK200 LC

    Push button. The instructions are detailed from the service manual. When you replace the governor motor, it will cycle and gives you an error. My understanding is that you follow Program A, and when you get a fail, you start again. Replacing the hydraulic pump tomorrow.
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    Kobelco SK200 LC

    The first time it failed - symbol flashed a couple of times and stopped. Afterwards it will not start the process. The special plug has three connectors. I only used the two connectors that connected to the one wire coming out of the cpu. (disconnect the plug, plug the special wire harness...
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    I wish I would have checked before buying

    I am (hopefully) in the process of fixing a Kobelco Excavator, then plan on purchasing a dozer. I am leaning towards a Cat or Deere - D4 size. Looking to spend about $40K and will need LGP. Are there any words of wisdom that you would tell, or nightmare stories of buying a used dozer? I...
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    Kobelco SK200 LC

    Bigwrench - thank you that explains a lot. I did replace the governor motor and did not have any luck with the "Program A" to get the CPU to talk to the gov motor. I am able to increase the RPMs using the dial in the cab. Can I push the "release:" lever to bypass the cpu? Even if I have the...
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    Kobelco SK200 LC

    All functions are slow (boom, bucket, travel and swing). Travels about 1/2 mile an hour if this gives you and idea. The system is a dual main valve system (?). A mechanic (mechanic #3) pulled the valves and stated that he did not see anything obviously screwed up. His plan is to put the...
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    Kobelco SK200 LC

    Yes, the pilot pressure was at 800 PSI, so I think we are good there. My plan is to put the rebuilt pump back in and then try to do pressure readings leaving the pump to try to see where the pressure drops. Not sure if this is the best way to track it down, but I am running out of options...
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    Kobelco SK200 LC

    Update: Brought the pump to get rebuilt (company specializes rebuilding pumps and has been doing it for 50 years). They called and stated the pump has normal wear (swash plate and piston edges) and can use a rebuild. However, based on what they saw, the pump is not the cause for the slow...
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    Kobelco SK200 LC

    One last one
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    Kobelco SK200 LC

    Another pic
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    Kobelco SK200 LC

    Here are pictures of side of the pump
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    Kobelco SK200 LC

    Yes, you are correct. Disconnected one valve (high pressure valve?) and that was it. I am going to have to figure out (myself) how to test the high pressure side of the pump and how to adjust the pressure plate.
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    Kobelco SK200 LC

    OOPS, my screw up - I think he was questioning how many splines on the shaft. I took my phone and jammed it into the pump area and took pictures. I did find a stamp (not a plate) with what appears to be K3v112 with some letters underneath. The problem I am running into - is that people...
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    Kobelco SK200 LC

    Update; I had a very skilled heavy equipment mechanic look at the machine. He stated that it appeared to be the pump based on how the machine was working and that ALL of the hydraulic functions were slow. He recommended a rebuilt pump. So I was speaking with a company that supplies...
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