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Busted angle rams? Any relief??

Discussion in 'Truck & Equipment Repair' started by mtnbktrek, Nov 28, 2013.

  1. mtnbktrek

    mtnbktrek Senior Member
    from NEPA
    Messages: 144

    I have had a few angle rams break (bent ram cracked case)from hitting stuff. Is there a relief valve that can open to relieve pressure from a solid hit? Not hitting stuff is NOT an option!
    The truck is a Intl4900 w central hyd plow is Meyer 10'
     
  2. dieselss

    dieselss PlowSite Fanatic
    Messages: 11,001

    It should have relief valve in it. How are you breaking the rams? Are they fully angled open or closed and you hitting curbs?
     
  3. jasonv

    jasonv PlowSite.com Addict
    from kannada
    Messages: 1,114

    Most plow setups should have an integrated crossover relief valve somewhere in them. These are always ADJUSTABLE, and should be set to release at a specific pressure indicated in the service manual for the plow you're using. However, since you're using the truck's hydraulics instead of a dedicated plow pump, it sounds like you are just running lines straight from the angle cylinders to valves.

    After confirming that you don't already have a crossover relief valve that is just adjusted incorrectly, get yourself a couple of tee's, couple of hoses, and a crossover relief valve.

    http://www.northerntool.com/shop/tools/product_200381955_200381955

    Basically, you tee into the two lines running to the angle cylinders, and run lines from each to the crossover relief valve. Adjust the valve according to Meyer's specifications for your application. Generally, if its set at too low of a pressure, the plow will be unable to adequately hold an angle. If its set too high, you'll bend your cylinders as you've been experiencing. Its better to have it set too low than too high.
     
  4. mtnbktrek

    mtnbktrek Senior Member
    from NEPA
    Messages: 144

    Yes they are full angle and yes the guys are hitting curbs - I did this last one.
     
  5. mtnbktrek

    mtnbktrek Senior Member
    from NEPA
    Messages: 144

    Thanks for info and the link! I will be checking to see if the truck has one. If it does not where should I instal one closer to the valve or closer to the rams? I believe it doesn't have one unless it in the valve control box in the cab.
     
  6. LON

    LON Senior Member
    Messages: 749

    Mount a 1800# psi cross over relief valve on the plow itself. Anywhere else will lengthen the reaction time.
     
  7. kimber750

    kimber750 PlowSite Veteran
    Messages: 3,698

    What pump? Meyer uses a crossover valve. It is under the large acorn nut. It is adjust by the smaller bolt in the center. It is surprising that you haven't damaged the C valve thou. If the crossover is set to tight normally the C valve is next inline to be damaged.

    Unless you have rebuilt a few crossovers or have the one piece design it can be a bit complicated to put back together. Download the manual from Meyer's site.
     
  8. dieselss

    dieselss PlowSite Fanatic
    Messages: 11,001

    Hey kimber. He's got a central hydro unit. No pump and motor
     
  9. kimber750

    kimber750 PlowSite Veteran
    Messages: 3,698

    Well now, everything I said then is useless. :eek:
     
  10. dieselss

    dieselss PlowSite Fanatic
    Messages: 11,001

    Lol that's ok you tried
     
  11. jasonv

    jasonv PlowSite.com Addict
    from kannada
    Messages: 1,114

    Yeah OP, like ^^ said, the closer to the cylinders, the better.
    However, putting it right out on the plow does make it a bit more vulnerable.

    Your choices regarding mounting it basically come down to the following;
    On the plow, where it will be more vulnerable,
    or
    Up at the valve block, where it will be less responsive.

    One thing that you can do to improve responsiveness of the crossover, is to oversize your hydraulic lines running from the angle cylinders to the crossover valve. The bigger those lines are, the less restrictive they will be, and the more responsive the crossover.

    Also, selecting a crossover valve that is larger than the lines will allow it to dump fluid through much faster.

    However, no matter where the crossover valve is located, and no matter what size the lines are, having one will be infinitely better than not having one.
     
  12. mtnbktrek

    mtnbktrek Senior Member
    from NEPA
    Messages: 144

    Ok thanks for all the replies! Great info on here