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Hitachi ex150 problems

Discussion in 'Excavators' started by ex150, Oct 2, 2017.

  1. ex150

    ex150 Member

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    Location:
    Blue canyon
    Hi guys, I just bought a 1990 ex150 with some issues and i have questions. So when im tracking I noticed that the right side track has barely any power compared to the left side which feels normal, cold or hot. Next problem is my swing motor oil leaks into the swing bearing area, does anyone know which seal needs replacing and if i can change it myself without any special tools? The pump whines even when its full of oil, it doesnt affect the performance of the machine, its just annoying to listen to it all day. Is there a hydraulic filter that might be plugged up? And last question is the 3 green lights on the dash, what do they mean? Thanks guys much appreciate any help.
     
  2. ex150

    ex150 Member

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    Ive noticed the hitahi ex machines have dash 1 2 3 etc. How do i know which one mine is? The plate on the cab just says ex150.
     
  3. GregsHD

    GregsHD Senior Member

    Joined:
    Sep 26, 2014
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    Occupation:
    Self Employed HD Mechanic
    Location:
    Mahood Falls, BC
    Howdy!

    1990 should be a dash 1 machine.
    Are you referring to the 3 green LEDs below the hour meter? Left is auto-idle on, centre is turtle travel speed, right is rabbit travel speed.

    Does the machine mistrack on level ground? Could be anything from track tension too tight, siezed rollers, binding final drive, propel brake not releasing fully, worn propel motor or leaking counter balance valves, leaking rotary manifold, pilot issues etc. Need more info to even guess

    I've never worked on a 150, Does this machine only have one pump like a 120?

    As far as the pump whine, is your oil foaming? Check for suction leaks, there is a mesh suction screen inside the tank, you can access it through the tank fill cover, I recommend draining the tank before removing the screen as any debris down there will go directly into the suction piping. Have you changed the return filter? If not or you have the old one, cut it open and look for brass, it could be from your pump or the lazy travel motor. I'm guessing your pump is just getting long in the tooth.

    Is it gear oil leaking from the swing bearing or hyd oil? If gear oil it's the swing drive pinion seal, no special tools required, the seal slips over the pinion gear. On my 790D same as dash 1 EX220 the snap ring on the pinion gear broke and took out the seal, If the pinion bearing is loose and causing the seal to leak it will require a 50ton press to re&re the bearing.

    Hope some of this helps!

    Greg
     
    92U 3406 likes this.
  4. ex150

    ex150 Member

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    Location:
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    Thanks Greg! I'll be working on it this weekend. I bought a rotary manifold seal kit and the big seal for the swing device gear that I'll be changing. I'll update after the weekend
     
  5. ex150

    ex150 Member

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    Changed the swing device seal over the weekend.
    I thought it would be a big job but it was actually quite simple. The seal on the bottom is held by a ring and bolts that comes right off and wholla. I used a harbor freight 1" air impact to unscrew the main bolts holding the swing device. Used my buddy's old school wrecker to pull the unit out. Powers washed it and changed the seal. Putting it back in was a little tricky but not too bad. I'd do this job over any transmission or clutch job any day.
     
  6. Ronsii

    Ronsii Senior Member

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    Occupation:
    s/e Heavy equipment operator
    Location:
    Western Washington
    3 green lights... the ones that come on when you depress the button below them... oil, coolant, hydraulic levels, green means ok.
     
  7. ex150

    ex150 Member

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  8. ex150

    ex150 Member

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  9. ex150

    ex150 Member

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    Now my next problem is figure out why one side track is slower than the other. And my hydraulic oil is milky. Is there a way to get rid of the water or do I have to replace all 55 gallons of hydraulic oil?
     
  10. ex150

    ex150 Member

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    There are 3 solenoids where the battery is located. What are these for does anyone know? Can it be a lazy solenoid causing one drive motor to be slower?
     
  11. Ronsii

    Ronsii Senior Member

    Joined:
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    Occupation:
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    You could try switching the lines(at the rotary manifold) to the drive motors and see if the problem follows the control swap... if not then probably an issue with the actual drive motor.

    Also did you pull all the oil/goop out of the base before replacing the swing motor gearbox?