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Plow won't stay straight

Discussion in 'Meyer / Diamond Products Discussion' started by Kenyou, Dec 21, 2007.

  1. Kenyou

    Kenyou Senior Member
    Messages: 375

    I know have read about this some place but I can't remember everything it said and I can't find it in search yet.
    My problem with our old 10 ft Meyers on our old County Truck is that it won't stay in the straight position. If I push a little bit more with the right side of the plow, it will collapse to the right. It doesn't do that to the left. I think I remember someone saying on Plow Site that it was a coupler problem but I'm not sure. I would appreciate any help you guys can give me.
     
  2. fernalddude

    fernalddude PlowSite.com Addict
    Messages: 1,105

  3. lawnmedic

    lawnmedic Senior Member
    Messages: 703

    Is this an under hood system or a standard pump(E-47, E-60,etc.) set up.
     
  4. Kenyou

    Kenyou Senior Member
    Messages: 375

    Hi Lawnmedic

    Acutally, this is powered by the commercial dump truck's hydraulic system that also controls the dump box and belly plow. It's nothing like my E-60 system except it has two hoses with disconnect couplers on it. It stays put if you are plowing to the left but if you push too much to the right it goes all the way to the right. I hope this helps.
     
  5. fernalddude

    fernalddude PlowSite.com Addict
    Messages: 1,105

    OK you need to give us more info before we can help. I was just showing you that it might be the crossover valve and used the example of the e-60 not knowing what type equipment you have. The more info you give the better the responce.
     
  6. lawnmedic

    lawnmedic Senior Member
    Messages: 703

    I would check the O rings in the angle control valve assembly. Sounds like an O ring is damaged and not sealing correctly. These control valves usually take standard size O rings and it is not uncommon for older units to do this.
     
  7. Kenyou

    Kenyou Senior Member
    Messages: 375

    Thank you Lawnmedic and Fernalddude.

    I take it that you mean the angle cylinder? We rebuilt the left one and the O rings were bad. In fact they looked like they were crushed a little. Of course with my luck, the problem was still there. I guess the right cylinder will be next. Not to mention that we rebuilt them both last year also. I noticed that some guys rebuild everything before the ask for help. I'm trying not to do this. This truck has a very big pump coming out of the front of the truck and runs directly off the engine and has two large 2 in hoses that go to and from the 50 gal Hydraulic tank. Then of course the system has two regular hoses that goes to the angle cylinders and one that goes to the up and down cylinder. Inside the truck are 4 levers and a diverter valve. Like I said before, this is an old county plow truck but the plow did not come with it. Unfortunately it was bought later and cobbled up to work. It is a 30 year old Meyers called a M-10. This is before my time.

    I really appreciate you guys trying to figure this out. Thank you so much.
     
  8. lawnmedic

    lawnmedic Senior Member
    Messages: 703

    The diverter valve is where i suspect you will find the bad o-rings. Sorry if I didn't describe it clear before....
     
  9. Kenyou

    Kenyou Senior Member
    Messages: 375

    Ok, so that is the culprit. I thank you very much. That will most likely be much more expensive and take a lot more time to do it. Oh well, I got to do what I got to do.

    Thank you guys for all your help. Now sit back and have a Merry Christmas.
     
  10. fernalddude

    fernalddude PlowSite.com Addict
    Messages: 1,105

    Kenyou, It seams you are confused on what we are talking about we are talking about the hydro system not the moldboard. So Iam just using this pic to explain how the hydro system works. Its a problem with the valves that hold the pressures on the cylinders the valve that keeps it from reliving pressures to the right is failing not the seals on the angle cylinder. I have not found any books on the equipment, you need to find the type hydro unit it has and do a search on it not the plow. Hope that helps

    flow chart (Medium).jpg
     
  11. Kenyou

    Kenyou Senior Member
    Messages: 375

    Thank you Fernalddude. I will try to save that Angle Flow Chart in case I have trouble with my personal E-60 plow, but the one I am having trouble with is the Ford Dump truck at the Sportsmans Club that I use. There is nothing on it that resembles a regular plow except the mold board and the angle cylinders. There is no A, B, and C valves to my knowledge. At one time this was used by the County to plow streets. I'm not claiming to be a mechanic, so I will take some pictures of it as soon as possible. In fact I just ordered a camera and will pick it up tomorrow. I'm hoping I can put the pictures on P.S. without too much problem. What ever the outcome, I really appreciate your trying to help. I was trying to help our club fix it as money is tite right now.
     
  12. wild bill

    wild bill PlowSite.com Addict
    Messages: 1,239

    holding straight

    i know the type of hydraulic's you are talking about ,check to see if you have a square or rectangular valve near the front of the truck were the angle hoses are tied in it should have a valve adjustment this is a cushion valve if the plow was added after the other hydraulic's ,it may be broke allowing the blade to not hold .if it was put together using one common valve block you will have to figure which valve section is for the angle function ,the cushion valve may be built in or the valve may be over shifting .
     
  13. Kenyou

    Kenyou Senior Member
    Messages: 375

    Thanks Wild Bill, I'll put an eye ball on it and see what I come up with. It does hold to the left but not to the right. When I push with the left half of the blade it works fine but when I push with the right side of the blade, it collapses. As soon as I figure out how to use my new camera I will go take some pictures of it.