Question about Caterpillar E70B Excavator

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I have hydraulic oil in my radiator, e70b

I have flushed it repeatedly. But it keeps reaccuring.

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  • Arlon Fowler
    Arlon Fowler Mar 25, 2014

    I doesn't use engine oil. It's loosing hyd. oil tho.

  • Floyd Fowler
    Floyd Fowler Feb 07, 2015

    It was the engine oil water exchange cooler mounted on the right side ov the motor. easy to take off and has 2- O - rings inside. Replaced them and all is well.



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I am not familiar with that particular machine, but I believe it would more likely be diesel or motor oil, unless of course there is a water exchange hydraulic cooler. If there is, check that for a leak to the coolant. If not, I would check compression on each cylinder, and/or look for signs of a blown head gasket. Other possibilities are probably more serious than even that. I hope this is helpful.

Posted on Mar 25, 2014

  • 1 more comment 
  • Arlon Fowler
    Arlon Fowler Mar 27, 2014

    I took a sample of the sludge and boiled the water out of it. It turned out to be motor oil. Why don't I have water in the crank case?

  • downhille Mar 27, 2014

    Perhaps it is because the oil pressure is greater than the water pressure. If you have the service manual, look to see where in the head or block the oil passages are near the water passages, and especially where there might be a gasket between them. I believe you will find a head gasket blown, or perhaps a blown gasket elsewhere.... or worse, a cracked block. I'd consult the manual, get your best idea of what could cause this, then proceed. I believe at the very least you will need to pull the head, but look (at the manual) for other possibilities. Again, I am not familiar with this machine, but I hope I can give you some ideas of where to start looking. May God bless you on your search, and in your life.

  • T Davis
    T Davis Apr 15, 2014

    This unit has a 4D32 engine - it has an oil cooler on the side of the engine. normally when you get oil in the water and not in the block/pan, this is the probelm. Check that...



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  • remove the one end of the hose that is from the rod end of the clylinder.
  • two ways you can go here. either: detach the one end of the hose that is attached to directional control valve and leads to the cap end of the cylinder and place the end in a pale then retract the cylinder by physically forcing the rod back in and all the oil will drain out of the cap end into the pale and the rod end will fill with air.
  • or u could hold the directional valve in the position to let the oil flow back to tank while physically forcing the rod back in. the oil in the cap end will drain to tank and rod end will fill with air.
  • drain the tank of oil.
  • if you wanted to be extra thurough remove the remaining lines and drain the oil out of them.
  • reattach all lines.
  • replace oil filters/strainers. should be one on the return line going to tank. and one on the suction line before the pump. But there may not be a second filter.
  • fill tank with new oil.
  • extend the cylinder using the pump. allowing the air to bleed off the rod side. may chatter at bit while extending. if excessive chatter remove line end to allow the air in the rod side to bleed to atmosphere and continue till fully extended.
  • reattach line. probably a good idea to run a couple cycles.
  • and repeat the entire process for a thurogh flushing.
  • ! note: dont be dissconnecting lines with pressure in them or while the system is running.
  • ! note: be sure to have enough oil in the tank so the pump is not sucking air. this will eventually cause unrepairable damage to pump if sucking air for too long.
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