Hello Guys I hope this messages finds you all in good health. I bought a Volvo EC290 Excavator couple of weeks ago. It is a 2006 Year model. I started experience a hydraulic overheat, which is slowing the machines movement, specially when it operates using the Jackhammer. The dealer inspected it, and found the hydraulic pump (Fitted with Hyundai pump) working ok. They checked the hydraulic valve, it was ok. So they said that the problem is from the Hydraulic cooler. The guy i bought who i bought the excavator from is insisting the problem is from the pump itself. i want to know if any of you had the overheat problem before, and what can i do to zero in on the exact problem. NOTE: The machine is performing great when the bucket is fitted. hope to be hearing your feedbacks really soon. Best regards Akram
Good day akram Strange you have a Hyundia pump are you sure this is of the negative regulation type which Volvo use. The pump is of Kawaski make these all look very similar however there are differing regulation systems. Can you confirm the pump and regulation system and i we are talking EC290B. Kind regards Uffex
Hello Uffex Well, i have to come back to you concerning the regulation. And yes it is EC290B. Thanks a lot for your reply
Had a similar problem with a Komatsu after letting two crazy guys washing the machine with the pressure washer, the foam or isolating material between water and oil cooler where missing, so the fan could only push the air from the water cooler. I another machine that I had the same problem was the pressure relief valve setting to low letting the hydraulic oil going back to the tank making the hydraulic pump working much more, changed the relief valve and the problem with overheating was gone. 1º Check the isolation foam between radiators 2º clean booth radiators with a big air compressor, I use to like air pressure more that the water pressure washer. 3º check pressures on your hydraulic system
Might want to get one of those laser pointer thermometers and make sure it realy is overheating and not a bad sensor just telling the computer you are to hot.
Good day Akram I have assumed we are talking hydraulic overheat and not that of engine cooling. First check that the air can flow freely past both engine and Oil cooler - next the question revolves around the cooler by-pass valve if this remains open the fluid will go the easy way back to the tank avoiding the cooling matrix. If you need an exploded view go to excatech.com Kind regards Uffex
Hydraulic hammers will cause a lot of heat in the hydraulic system just by the nature of their design.It is hard to diagnose without knowing how it is plumbed in.How much flow does it require,?Does the return from the hammer go through the cooler or straight back to the tank?Do you have flow combiners off both pumps or are you just using the auxiliary function ?What is the dash size of the return hose from the hammer (is it a hose or steel tube-steel lines will shed heat faster than hose) ? How much back pressure does the return have ? Is the hammer the proper size for the machine ? If it working fine with the bucket on then you may have to replumb the hammer hydraulics.Any restriction to flow will create pressure which in turn creates heat. A low or improperly set relief will create a lot of heat as will poor air flow through the cooler. A laser thermometer in a very useful tool for finding overheating problems. How hot is it in Qatar ?
Good day Akram The standard Volvo hammer setup use's a by-pass sytem for retun fluid this results in hammer return oil going direct to tank. It may be that the hammer creats fluid heat that returns un-cooled. You may try changing the system to shear control providing the hammer can stand some return pressure, the fluid will then be forced to go via the cooler. We can provide more information at excatech.esy.es Kind regards Uffex