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unimount mvp. won't go down.

Discussion in 'Western Plows Discussion' started by Freshwater, Mar 2, 2015.

  1. Freshwater

    Freshwater Senior Member
    Messages: 883

    It's stuck up in vee. Activates up, left, right. No down, wing, scoop, or vee functions. They don't activate the solenoid or anything. Just installed and was working perfect. Been driving all day and now having issue.
  2. mishnick

    mishnick 2000 Club Member
    Messages: 2,243

    Your uni V needs two valves to open for the blade to drop, S! and S3. They are both under the top valve cover, the rear and middle cartridges.
    Since this is an analog control system (one wire for every valve) I would suspect an electrical problem. The first thing I would do is try a different controller or just put jumper wires on the S1 and S3 to bypass the harnesses and controls. Since the valve coils are common + all you have to do is jump them both to ground.

    Another way to test it is by checking for magnetism. If you hold the down button for a few seconds the green float light should come on so it holds both valves open even after you release the button. Then take a ferrous metal object and hold it to the end of the S! and S3 to see if there is any magnetism present. If both valves are magnetized then you need to pull those two valves and see which one is stuck. If one is not magnetized then follow the wire for that coil and see if you can find a break or a bad pin at the grill connection. Another good place to look is at the black cannon plug where the controller plugs in. Ensure all the wires are fully seated and undamaged.

    Here is a link to the mechanic's guide. http://library.westernplows.com/westernplows/pdffiles/21857_061503_web.pdf
  3. Freshwater

    Freshwater Senior Member
    Messages: 883

    Brought it inside and after 10 min it started working fine. So we flushed all fluid and haven't had a problem since. We did move the wiring under the dash. So we might have had a bad connection in the controller connector. Controller is brand new. Well see going forward. Thank you for the schematic.