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Recent content by blanchb

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    D4C hydraulic oil cooler failed 5th time

    The cat dealer thinks it’s because of trapped dirt also. But with a round fan and a rectangular radiator, it does collect more dirt in the corners due to the fan air not really blowing hard in the corners. Most of my jobs are in areas that don’t have running water and all of my other machines...
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    D4C hydraulic oil cooler failed 5th time

    Wow! That was quick and good information. Thanks. Where did you find an aftermarket one?
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    D4C hydraulic oil cooler failed 5th time

    I’m going to take off the cooler this weekend. I’ll get pictures and part numbers after I get it off. Serial number is 4ls00410. The last 4 were rusted and had pin holes in the tubes. I only put about 200 hours a year on my dozer. I mostly spread clay and topsoil for residential house pads and...
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    D4C hydraulic oil cooler failed 5th time

    I have a 2001 Caterpillar D4C hystat LGP. I am in the process of replacing the hydraulic oil cooler for the 5th time since I bought it in 2008. All of the coolers have failed in the same area. (bottom right corner). The parts department at my local caterpillar dealership is telling me that’s the...
    • blanchb
    • Thread
    • cooler d4c hydraulic hydraulic cooler
    • Replies: 9
    • Forum: Dozers
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    PC120-6 Display monitor power

    Thanks John. I’ll double check the grounds. I may take the grounds off and clean them up and reinstall. I was curious that since I’m showing 24volts at one of the pins on the pin connector plugs that something may be wrong with the new monitor. I got it off EBay so it’s probably refurbished. I...
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    PC120-6 Display monitor power

    The display monitor on my Komatsu PC120-6 quit working. I bought a new monitor and it doesn’t work either. I traced the power wire from the fuse box to the monitor and it has about 24 volts. The machine cranks up and runs the throttle response but the engine won’t rev to full rpm. Like it’s in a...
    • blanchb
    • Thread
    • display monitor komastsu pc120-6
    • Replies: 3
    • Forum: Excavators
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    PC120-6 weak hydraulics

    The main relief valve finally came in and I installed it. I cranked up the machine at low idle and it put out 4500psi. I was a little worried about over pressurizing the system and causing the relief valve to open so I backed down on the TVC adjustment. It really didn’t make a difference on the...
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    PC120-6 weak hydraulics

    Lachau. Thank you soo much!! I’ve been straining my brain trying to figure out how this relief worked. Now, after reading this and comparing what I’m reading to the pictures numerous times I think I finally got it. there is a very small flow going through both relief orifices even during normal...
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    PC120-6 weak hydraulics

    I worked all night last night and didn’t get home until 5:00am this morning, so I didn’t get much sleep. Maybe that’s why I’m so confused about this.
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    PC120-6 weak hydraulics

    Lachau. I definitely didn’t mean to misquote you. I do remember that you posted the document with the different max pressures for each function. It was the same document just like the last document that you posted. That’s why I’m confused about the main relief pressure settings? I must be...
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    PC120-6 weak hydraulics

    Thanks Lachau. I’ll look into replacing the monitor display panel. Since we are on the topic of “Chinese Magicians”. I attached a screenshot of part of the conversation I had with the place I bought the main relief valve from. I had asked them if the relief valve was already set and ready to...
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    PC120-6 weak hydraulics

    I will unplug I will disconnect any plug that I can find associated with the monitor and reconnect them. I let you know if it works.
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    PC120-6 weak hydraulics

    Fastline. All of the buttons and the lights associated with the buttons work. The digital read out portion of the display doesn’t work. Lachau. I will double check the cooling system. I’m thinking that the only things that I could check is the cleanliness and air flow through the cooler and...
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    PC120-6 weak hydraulics

    I can monitor engine temperature and oil pressure. And also monitor hydraulic oil pressure. The hydraulic temperature I have to measure manually.
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    PC120-6 weak hydraulics

    Are we thinking that the main relief is bad and causing the loss of pressure and the excessive heat in the hydraulic system? Or are we thinking that there’s something wrong with the cooling system and the loss of pressure is because of the breakdown of the viscosity of the hydraulic oil at high...
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