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ex120-2

  1. J

    EX120-2 system base pressure too low

    Hey everyone, I am looking for some more brain power with this problem. Machine is a 120-2 with what I believe to be a 120-3 main control valve (mcv). This means it does not have the adjustable pressure regulator on top of the unloading valve like the -2. Its on the bottom instead. According...
    • Jason Klassen
    • Thread
    • cracked control valve dp sensor ex120-2 ex120-3 hitachi internal crack main control vavle pilot pressure pressure unloading valve
    • Replies: 122
    • Forum: Excavators
  2. J

    EX120-2 Stalling when Control Lever Down and Warmed up

    I have a EX120-2 with a stalling issue when the control lever is down. Been working on bringing this machine back to life after neglect from previous owners. The machine used to constantly stall. I have replaced the pvc, solenoids, angle sensor, pressure sensor, and dp sensor and all wiring...
  3. J

    Issue trying to connect to EX120-2 Computer with USB Cable and DR Zx

    I have a EX120-2 and I am trying to connect with a DR ZX version thru a usb cable. Using windows xp and emulator. I worked thru the issues with the com port on the computer, but still can not connect to machine. The lights are flashing red on the pvc and ec (about once every two or three...
  4. Syleng1

    Hitachi PVC question

    Quick question: Hitachi EX120-2 My hydraulics are getting slow after warm up - previously I asked questions about swing only but now tracks are slowing and eventually the arm and boom movements are getting choppy after run time. 0-20mins all is well 20-30 mins of time loose swing speed 30-35mins...
    • Syleng1
    • Thread
    • ex120-2 slow hydraulics solenoid
    • Replies: 3
    • Forum: Excavators
  5. Syleng1

    Hitachi EX swing issue

    Hitachi EX120-2 Excavator 1995 4,500hrs. I'm having issues with the swing motor. At first it would act lazy after 2-3 hrs. of use and now it barely swings after 10 mins from cold to warm. Meaning it moves left or right but at about a foot per 5 seconds with the bucket and arm curled in. Forget...
    • Syleng1
    • Thread
    • ex120-2 hydraulic pressure problem
    • Replies: 8
    • Forum: Excavators
  6. T

    EX120-2 Hydraulics

    Does anyone actually use the hydraulic tank heater? The manual said, if the tank is below 86F select the tank heater until the light goes out. I’m going to install a seal kit for the main pump, any recommendations who I should order the kit from? Prefer ordering inside USA. Can someone post a...
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