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  1. M

    Hitachi ex120-2 slow/week hydraulics

    Brought my excavator to a good Machanic and he can’t figure it out ether. He’s talking about trying the conversion kit to bypass the computers. Has anyone tried one and had success?
  2. M

    Hitachi ex120-2 Repair manual

    Does any buddy know where I can find an actual shop repair manual for a hitachi ex120-2 or John Deere 490e. I have a technical manual but it doesn’t have step by step removal and installation procedures. Thanks
  3. M

    Proportional solenoid valve

    Hey guys, on my hitachi ex120-2 still has slow/weak hydraulics. Got a new solenoid valve but might have ordered the wrong one because the new one doesn’t have the adjusting bolt. And it requires a smaller pin (which didn’t come with it) and the hole is much smaller. Question can I use this valve...
  4. M

    Hitachi conversion kit

    Does anybody know if the conversion kit for an hitachi ex120-2 actually works? You’re eliminating all solenoid valves, pressure sensors, angle sensor. So you simply install this and disconnect the computers? Would love any input from someone who’s tried it.
  5. M

    Hitachi A sensor adjustment

    I’m trying to adjust the A-sensor On my Hitachi EX 120-2 The manual says to be sure the punch mark on the shaft faces towards the label on the sensor casing. But I’ve read About other guys saying the punch mark should Face away from the harness. Does anybody know which is correct? Thanks for any...
  6. M

    Mysterious Hydraulic leak

    Hay guys, I mentioned this before now I’m just getting back to it. On my Hitachi Ex120-2 I have a bad “hydraulic fluid” leak. Not gear oil. Fluid is coming out between the swing bearing. When I got under the machine it was dry. I saw a small what I would call an inspection plate with 2 bolts...
  7. M

    Fuse blowing

    on my hitachi ex120-2 The fuse for the ec motor blows as soon as I turn the ignition key on. I traced the wires from that fuse to the ec relay. They all seem ok. I tried the wiper relay in place of the ec relay but still blew fuse. next to the wire at the fuse is a thick red wire which looks...
  8. M

    Hydraulic oil leak

    Hay guys, On my hitachi ex120-2 it’s leaking hydraulic fluid from between the swing brg. Is there an oring at the bottom of the swing motor that could be leaking hydraulic fluid?
  9. M

    as

    Hey guys, I’ve been running aw46 in my hitachi ex120-2 as I been working on various problems. As a substitute only with zinc. Now I noticed the aw46 says “not recommended for wet brakes” on the bucket. What hydraulic fluid should I be running.
  10. M

    Solenoid valve

    On my hitachi ex120-2 swings slow. I’m trying to check the swing solenoid valve. Got the solenoid off but can someone tell me how to pull the valve out of the valve body. Nothing to grab onto.
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