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    Komatsu PC90 Overheating Issue

    Sorry for my confusion, but does that mean that my PC90-1 doesn't have a machine control computer?
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    Komatsu PC90 Overheating Issue

    That last photo is of the bottom Sorry for the typo, it should have read "nothing has improved it". We have cleaned the oil cooler as well, and running a 50/50 mix of coolant. Unfortunately I cant get the temps for you today, but I will try as soon as I can. Thanks!
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    Komatsu PC90 Overheating Issue

    Pump from underneith:
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    Komatsu PC90 Overheating Issue

    I forgot to mention that we did replace the water pump, but have not checked the gauge or sending unit. I am not quite sure how to check those.
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    Komatsu PC90 Overheating Issue

    Thanks for the reply, I did look at the fan and it appears to be installed correctly. I appreciate the brainstorming here! Please keep the ideas coming! I would love to get this thing fixed so that I can be confident taking it out on jobs again.
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    Komatsu PC90 Overheating Issue

    Thanks for the response John, all of my documentation indicates that this is a 1993 model PC90-1 with the 4D95L engine. I will try to get a photo of the hydraulic pump tomorrow in the daylight. If the speed sensor was burnt out, would I know it by any indication or operating behavior? It...
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    Komatsu PC90 Overheating Issue

    Regarding the specs: It is a 1993 model with 11,500 hours on it. Komatsu PC90 Serial #1715 Engine: 4D95L-1, Serial #154310 Track machine A mechanic came out to look at it a couple of years ago. He measures the coolant temperature at upper and lower radiator hoses and he said that both the...
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    Komatsu PC90 Overheating Issue

    Hello everyone, I have a Komatsu PC90 that overheats after about an hour of use. I have changed all cooling related parts such as new radiator, thermostat, cleaned between radiator and oil cooler, inspected fan and foam seals around fan. Nothing has not improved it. I can run without issues if...
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