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MVP Plus creeps down need help!

Discussion in 'Western Plows Discussion' started by jjmcnace, Jan 20, 2014.

  1. jjmcnace

    jjmcnace Member
    from Iowa
    Messages: 64

    I have a MVP Plus Ultramount plow and it creeps down while I drive. My lift ram did appear to have a leak on the jam nut end of the cylinder so I replaced it thinking it would fix the problem. After replacing the lift ram the plow still creeps down the same as it did before. I then replaced the S3 cartridge valve after looking at the manual in the troubleshooting section. After replacing this valve plow still creeps down as it originally did. Could the seal be going out between the motor and the valve body? It doesn't seem to leak much oil, but it does appear to leak a little. Would this seal allow the plow to creep down by bleeding off pressure? Plow creeps with the plow turned off and truck off.

    Thanks for any help.
    Jeramy
     
  2. Nestech

    Nestech Senior Member
    Messages: 105

    Check the O-rings really closely on the S-3 valve, even a slight nick will allow it to leak down.
     
  3. mishnick

    mishnick 2000 Club Member
    Messages: 2,243

    On the MVP plus there r two valves that hold the blade up. S2 and S3. U can eliminate the S3 by turning the quill valve all the way closed. If it stops leaking down replace the S3 is the problem if it still drops it's the S2.
     
  4. jjmcnace

    jjmcnace Member
    from Iowa
    Messages: 64

    I did replace the S3 but I will check out he S2 valve.
     
  5. banonea

    banonea PlowSite Fanatic
    Messages: 5,101

    Is this the same concept with the wing rams? both my rams seam to loose pressure in any position.
     
  6. mishnick

    mishnick 2000 Club Member
    Messages: 2,243

    There r other valves involved with the wings like the crossover relief valves etc. it's not nearly so simple. U need to look at the hydraulic schematic in the mechanics guide. And then the system is different depending on exactly which v plow u have.