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  1. J

    2004 Case 60XT loader jerking downward

    Today I pulled out the "Lower Counterbalance Valve". I found a smushed o-ring on the outside and when I pulled it apart there was only half a backup ring left on the check valve. From what I understand this valve controls the oil flow coming back from the lift cylinders and helps lower the...
  2. J

    2004 Case 60XT loader jerking downward

    Hi Everyone, I'm looking for some wisdom with the Case skid steers. I have a 2004 60XT with the bi-directional self leveling option. I recently bought the machine and did some maintenance along with a paint job and new decals to freshen it up. The problem happens when I go to lower the loader...
  3. J

    EX120-2 system base pressure too low

    So... just wanted to let you guys know that I have a youtube channel now. I sent a message to the moderators asking if I could announce it hear but did not get a reply so hopefully its ok. If you are interested you can go to youtube and search " EducatedGuessing Excavator Crane ". There are two...
  4. J

    Dr. ZX communication problem with John Deere 490e (Hitachi 120 equivalent)

    Hey Joel, unfortunately I am in the same situation as you, although mine did work for a while. When I first got it, it would not connect with the plugged clicked in correctly. So I flipped it over and plugged it in (without de-pinning the connector like you did) and it connected. I went through...
  5. J

    Boom down randomly becomes weak when warmed up - John Deere 490e excavator

    Sorry mg2361, a small correction if I may... 24 deg is the max pump angle. At idle with the control levers in neutral the pump angle should be 3-5 deg.
  6. J

    EX120-2 system base pressure too low

    I replaced the entire main control valve (distributor). The control valve actually splits into 2 pieces after removing the 4 big allen headed bolts. One side has bucket, boom, arm and auxiliary spools and the other has the main relief/unloading valve, swing and both travel spools. I think I...
  7. J

    EX120-2 system base pressure too low

    Yes, I put air pressure into the control valve (distributor) through the oil inlet to check for leaks. With the control levers in neutral the oil flow is blocked by the main spools and the unloading valve. The unloading valve is supposed to bypass oil when 284 psi is reached. Mine was only...
  8. J

    Boom down randomly becomes weak when warmed up - John Deere 490e excavator

    Yours would be equivalent to a -2 Hitachi. John Deere has a split at 25000. 24999 and down is -2, 25000 and up is -3. I would try clearing the codes and running the machine again until the problem appears. Then force it to do the problem a few times so that it will store a code. Any of those...
  9. J

    Hitachi EX100-2

    Sounds like it could be a problem with the load sensing shuttle valves. Since your machine has the manual conversion it is unlikely to be the proportional solenoids that control the variable pressure compensated valves. The computer controls these for combined operation of functions. The...
  10. J

    EX120-2 system base pressure too low

    We have success! I can now reach 5000 psi with every function in P mode and the hydraulic oil up to temperature (50C). I unplugged the pump control solenoids and let it fall to maximum angle (24 deg). I then back probed the electrical connector for the angle sensor (one probe on signal and...
  11. J

    EX120-2 system base pressure too low

    I set the angle sensor according to the instructions in the manual. It says to set the angle sensor to read 4.40V +- 0.03V when the pump is at 24 deg. - Is there a different voltage that you have found to work better? I tried a quick test today. I unplugged the pump angle control solenoids and...
  12. J

    EX120-2 system base pressure too low

  13. J

    EX120-2 system base pressure too low

    Yes, I believe the unloading valve is working fine. Interesting solution Lachau! I am willing to try it but I have some questions first. - If I were to add a shim to the spring on the unloading valve would that raise the pressure? - The DP sensor in the control valve is the non-adjustable...
  14. J

    EX120-2 system base pressure too low

    Alright, I tried increasing the system surge relief (B) valve first. I turned it in (tighter) a full 5 turns and it made no difference. I then tried adjusting the overload relief valve (C) for the thumb circuit. It was around 4000 psi and I wanted it lower, around 2400 psi. I backed it out in...
  15. J

    EX120-2 system base pressure too low

    Thanks Lachau, I understand that system pressure regulator sits on top of the unloading valve and that they work together to control the system pressure. I am unsure of what you would like me to check, or what I might not be understanding? This is the procedure I have been using to check the...
  16. J

    EX120-2 system base pressure too low

    Ok, I first gave the surge relief a 1/4 turn and then 1 full turn in. Both made no difference, still 4200-4400 psi. I started with a 1/4 turn because after doing the conversion 28.5 kgf/cm2 is equal to 405 psi. The system pressure regulator on top feels like it is at the end or just about the...
  17. J

    EX120-2 system base pressure too low

    Hey mg2361, I'm happy your still checking up on me! My old control valve with the internal cracks was from a ex100-3, it had the plug on top and a surge relief that acted as the system relief on the bottom. The "new" control valve is correct for my machine, it being an ex120-2. There is a...
  18. J

    EX120-2 system base pressure too low

    Well, looks like we are not exactly out of the woods yet! In the previous post I mentioned getting 4800 psi, but that was with 20C hydraulic oil temp. Today it was 25C ambient and I was able to get the oil up to 50C like the manual wants without any trouble. Then I ran the machine up to full...
  19. J

    Hitachi EX100-2

    Hey bc timber and TheMethod, check out my thread: https://www.heavyequipmentforums.com/threads/ex120-2-system-base-pressure-too-low.94910/ I ended up having to replace my entire main control valve with a good used one from a wrecker. There were internal cracks in the casting casusing oil to...
  20. J

    EX120-2 system base pressure too low

    Thanks Gary, I have received quite a built of help from the forum members and I hope all this info can be helpful to somebody else. Small update: Since the the base system pressure seems to be good now that the new main control valve is installed, I wanted to test the upper end and see if the...
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