I have an hitachi ex100-2. It starts and runs fine but when you move the hydrolics it wants to die, so i changed all the fuel system filters, and the oil tank filter, i notice when you move both tracks at once it moves fine but when i move just one track it wants to die, you can move the hydrolics very slow but not fast or it will die, the ex 100 has been sitting for six months. Any ideas neal
Not sure about the Hitachi's, can't remember, but some of the Japanese engines have a tiny strainer screen in the center of the banjo bolt where the fuel line from the tank attaches to the transfer pump. Unscrew the bolt and check to see if there's a strainer screen in the center, usually can be removed with a screwdriver for gently blowing out. If the fuel line isn't spurting fuel out, blow back through it gently with an air hose, repeat gently. Might want to loosen the fuel cap for this, should be vented but you never know. :my2c
thanks I have taken that screen out and put in a in line filter, I wounder it has anything to do with the two selenoids.
Does the engine rev back up quickly when you remove the load or struggle to regain revs? If it comes back slow, sounds like fuel or turbo. If fast, sounds like a hydraulic control problem. Keep in mind that turning takes more power than going straight. For what it's worth, I've got a 120-2 with gremlins. I'm trying to do it the hard way, but sometimes you need to get a Deere/Hitachi tech with experience and machine-specific diagnostic tools.
agree with lantraxco. first check the fuel strainer inside the banjo bolt. clogged stainer will cause engine stalling. good luck
What does the fuel itself look like, are your filters being plugged as fast as your putting them on. My 100 had two of those screen filters in banjo bolts, check them all for screens, blow out all the lines and make sure nobody put anything in the fuel tank and cut the filters open to look inside those as well. It sounds like its starved for fuel, or at least that's what mine does when it does as you describe. Lift a track off the ground and roll one and see what the engine does as you do that, it shouldn't even notice or loose power doing that simple thing, if it does, you have major fuel problems would be my guess.
On fuel issues, the first place you should really start is with the drain valve on the bottom of the fuel tank. It's in a pocket that collects water and rust. There should be an allen head screw in the center. Remove that, open the petcock and drain until you see clean fuel. It's something you should do regularly on a machine like that.