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Recent content by Jlap530

  1. J

    JCB 1550 weak backhoe : relief valve?

    PROBLEM SOLVED! Well, I pulled the bottom of the relief valve off, everything checked out... Took a nice bath in fluid... Any tricks to not taking a shower Everytime I pull something apart? While I was under there I looked over the rest of the system. My machine has a Wain Roy rotajaw bucket...
  2. J

    JCB 1550 weak backhoe : relief valve?

    Yeah sorry I had the underside apart once, cleaned it. Checked the tiny hole in the poppet, then put it back together. I've had the top side apart a few times since. Is there something in the bottom i need to revisit? I'll try playing with the adjustments a bit more.
  3. J

    1987 JCB 1400B / tech advice /Operators Manual & Parts Book

    I would still swap them under the machine at the control valves, but if you have a handy spot outside the machine it should work. You might need to buy longer hoses or something. I would not get under the machine without the tires on. It's obnoxious and messy and frustrating under there, but...
  4. J

    Khoering excavator has engine bogging down....

    My limited experience with the old diesels says they don't need much to work right. Here's what I'd do, someone probably has a better plan out there... I'd start with the air filter. Then changing fuel filters. There is probably a fine mesh screen in addition to a filter somewhere in the...
  5. J

    1987 JCB 1400B / tech advice /Operators Manual & Parts Book

    Not an expert here, but I believe all the controls for the backhoe have their own relief valves. They are all set to the same pressures. All the hoses coming off should be the same size. The cores are all identical. Simply swapping the hoses to the lever you want should be the whole job. Just...
  6. J

    87 1400B centremount kingpost #14BN2037/325454/7

    No real help to offer, definitely interested in the advice you get though. I'd like to do this to mine (once I get some other problems sorted)
  7. J

    JCB 1550 weak backhoe : relief valve?

    Sorry to disappear for a while there. I ended up wrecking a spring in the MRV with all my messing around and had to order a new one from the UK (through the local JCB dealer). Got the spring today and reassembled the MRV. O-rings all appeared good (I had replaced them previously). I did nick a...
  8. J

    JCB 1550 weak backhoe : relief valve?

    Thanks for the reply. Yes I have the small step pipe to steel block. The o rings that the block slips over looked ok, maybe a little stiff, so I replaced them with some out of my metric kit. There was no change in the pressures before or after the change. I am setting the pressures as I...
  9. J

    JCB 1550 weak backhoe : relief valve?

    Just thought to add some more info. I've changed filters and fluid, and cleaned suction screen. Also fixed a couple leaking cylinders. I recleaned/polished up the relief valve. I'm trying to figure out how the backhoe can have a lower PSI than the loader. They share a 2 stage relief. They...
  10. J

    New Holland 555E Hydraulic System

    I used a can or 2 of brake clean on my JCB suction strainer. A toothbrush can help with the fine mesh too. It's definitely worth the couple minutes to pull it off if the hydraulic fluid is already drained. If that gets plugged it's pretty much lights out for the pump.
  11. J

    JCB 1550 weak backhoe : relief valve?

    Hi guys, I've been a lurker for a while and you've helped me on a bunch of projects, but I've come across a problem I can't solve with the search function. On the bright side, it got me to finally sign up! So here's what I've got, I'm hoping it's actually a common issue to you hydraulic...
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