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Vickers solenoid dump valve repair (JLG component)

Discussion in 'General Industry Questions' started by colson04, Jul 9, 2021.

  1. colson04

    colson04 Senior Member

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    Anybody ever rebuild one of these valve bodies?
    20210709_151356.jpg 20210709_151359.jpg 20210709_151405.jpg

    The vickers dump valve has blown the big o-ring that seals to the valve body. First local hydraulic shop gave me 2 different o-rings and neither was correct. Machine leaked with first one I put in, swapped it for 2nd and it no longer leaked. Then while trimming a fence row last week, it started gushing oil out every time anything was cycled. Parked machine, went on vacation. Back to repairs today. A different hydraulic shop said its a #16 fitting. Handed me an o-ring and sent me out the door. I'm putting it back together and taking it out to the machine, but is there anything else I should be looking into before I put it back. Machine cycles, functions as it should so I don't believe anything else is mis-behaving.

    I just have a lot of work lined up for this machine this month and I am getting really tired of the down time. I already had to rent a towable last month due to a broken final drive, not looking to keep renting.
     
  2. Vetech63

    Vetech63 Senior Member

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    You just need the right oring is all. In your last pic from the side view, that one looks a bit thick. On average the outer part of the oring will be slightly bigger than the outer thread diameter.
     
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  3. JLarson

    JLarson Senior Member

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    When you say you went to a hydraulic shop you mean you went to like a hose shop for valve block
    parts?
     
  4. willie59

    willie59 Super Moderator

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    All of the fittings/valves in that manifold are SAE o-ring boss where they screw into the manifold. SAE o-ring boss requires 900 series o-rings, any other series, 100, 200, 300 series, etc, will fail, you have to use 900 series o-rings. If it's a SAE -16 (dash 16) size, the o-ring would be 568-916. If a fitting is a SAE -8 size, the o-ring would be 568-908. You have to use 900 series o-rings. If that's your machine and you plan on keeping it I'd suggest obtaining an o-ring boss o-ring kit, you're going to need it as time goes by. As for the narrow cross section o-rings on the cartridge valves in that manifold, you'll find them in the US Industrial o-ring kit as those o-rings are the ought series, like 568-011.
     
    Last edited: Jul 10, 2021
  5. colson04

    colson04 Senior Member

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    Solid info guys.

    I went a hydraulics shop that repairs motors, pumps, etc. They sent me out with what he called a number 16 size o-ring. Later, I went through my parts manual for the machine and found that JLG has a seal kit for the dump cartridge that has the 2 viton o-rings and the plastic backing ring. I was able to get one ordered and its on the way already.
     
  6. JLarson

    JLarson Senior Member

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    Should see if you have a dedicated seal supplier nearby.
     
  7. colson04

    colson04 Senior Member

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    @willie59 Does the durometer or material they're made from matter? I quick searched Amazon and found several boss o-ring kits (900 series) with different durometer listed, and different materials listed. The parts and service manuals I have do not list anything for those specs and just list seal kits for the various valves and cartridges. That said, the kits are not readily available for this 27 year old machine, and they aren't cheap either. It cost me $32 after shipping for 2 o-rings and the plastic backing ring. For $40, I can buy a 275 piece boss o-ring kit. So, one off here and there, the seal kits work, but if I have to do a lot of them, it doesn't make much sense.

    As they aren't horribly expensive, I would like to pick up a couple different kits to cover my basic needs. Aside from a boss o-ring kit for the JLG for the valve bodies, what other kits should I pick up? I'm covering 3 different machines: the JLG lift, a bobcat 753, and an old Deere 310A.

    I had no idea there were so many different types of o-rings until a few minutes ago.
     
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  8. Nige

    Nige Senior Member

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    I bet you’re sorry you asked now aren’t you.?
     
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  9. colson04

    colson04 Senior Member

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    No, I appreciate the knowledge. I think it'll save me a lot of headaches in the long run servicing my old equipment.
     
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  10. willie59

    willie59 Super Moderator

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    900 series o-rings are typically 90 duro. However, they are also available in 70 duro. I've used both and haven't ran across an application of either that produce a noticeable difference that would sway me one way or another. For the machines you have, the Boss o-ring kit and the US Industrial kit will supply you with most of the o-rings that you need, except for large o-rings like lids for hydraulic return filters or suction flanges, stuff like that, but those two kits will take care of the bulk of fittings and valves you'll be dealing with. And yes, cartridge valves typically use the ought size o-rings and typically have a back up ring, either a split ring teflon or one piece urethane. I had my local seal supplier put together a kit for me of one piece urethane back up rings for my ought size o-rings like the 568-011, 568-014 etc. In most cases you can re-use your old back up rings on those valves, but sometimes pressure erosion from a faulty o-ring will distort them and it's best to replace them.
     
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  11. colson04

    colson04 Senior Member

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    Thank you for sharing Willie59, I appreciate the information.
     
  12. partsandservice

    partsandservice Senior Member

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    What was the condition of the o rings that were leaking? Did they appear to be eroded? That appears to be an aluminum block and I have found many to be cracked in the bevel seat for the o ring esp. if the o ring is eroded.
     
  13. colson04

    colson04 Senior Member

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    O-ring was blown out and separated. I still have it, I'll take a pic to share. I did look at the valve block but did not see any wear or erosion where the o-ring goes.
     
  14. willie59

    willie59 Super Moderator

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    Something that's pretty common on those manifolds is failure from dissimilar metals, steel cartridge valve, aluminum manifold, those two metals expand and contract at different amounts and causes the steel cartridge valve to get just the slightest bit loose. Add that to an aged o-ring which has become hard from heat over time and lost its elasticity and boom, pressure will find a gap and cause rapid erosion failure of the o-ring. When I find one that has done that I replace all the o-rings on that particular manifold. I just recently did that on a Genie GTH-1056, all the o-rings on the main control valve as well as the solenoid valve manifolds, a bunch of damn o-rings. But it had become a leaky beast and prone to sudden o-ring failure on a job site, it was time remedy that problem.
     
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  15. willie59

    willie59 Super Moderator

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    And we haven't even brought up BSPP or German DIN. :D
     
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  16. willie59

    willie59 Super Moderator

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    Colson, not really sure about that Deere 310A, that's an older machine and I can't recall for sure, but Deere is fond of hose fittings that are o-ring face seal (ORFS). If that's the case on your machine you might want to score an ORFS o-ring kit. The JLG and Bobcat are pretty much JIC fittings, those fittings don't require an o-ring where the hose connects to a fitting. The only exception to that general rule is sometimes Bobcat used Parker JIC Triple-Lok fittings on some of the high pressure fittings, like drive hose fittings. It's the same fitting as a JIC but has an added o-ring on the fitting. Don't worry much about them. Just my personal opinion from experience, I just don't see the added benefit of adding an o-ring to a JIC fitting. If a JIC is fitted proper it's a fairly reliable seal, no need for a second redundant seal. I'm sure there's an application where the Triple-Lok is beneficial, just don't see, rather, have never seen it being a problem on a Bobcat. JMHO
     
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  17. JLarson

    JLarson Senior Member

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    We usually have 90 ORB, ORFS, a general parker like 200 series kit for low pressure stuff, flange kit and a cat flange kit. Covers the majority of oh no's in the field.
     
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  18. partsandservice

    partsandservice Senior Member

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    If the block is cracked it may be difficult to see. It will not look like a scratch, it will have a zig zag pattern. A magnifing glass helps .
     
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  19. colson04

    colson04 Senior Member

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    Guess what?! Life just keeps getting better.
    20210715_112313.jpg
    Screenshot_20210715-112335_Gallery.jpg


    @Vetech63 I absolutely loathe parts guys right now. I have the parts manual for this machine. Found JLG has a seal kit for this dump cartridge (p/n 7010560). Local JLG dealer said price is cheaper if I order that seal kit direct off JLG's website. $31 after shipping and they have 1 in stock in Georgia. I received package, removed valve block from machine, opened UPS package and found this:
    20210715_112842.jpg

    Package clearly states correct part number and and item description, but the only thing in the bag is a M'F'in sticker!!!!
     
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  20. JLarson

    JLarson Senior Member

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    Hahaha