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MVP filler cap

Discussion in 'Western Plows Discussion' started by Dailylc, Nov 16, 2014.

  1. Dailylc

    Dailylc Senior Member
    Messages: 226

    Hooked the plow up, raised it turned it both directions and drove it home. When I let the plow down and turned the truck off, the filler cap blew off and spewed oil all over truck and plow. What is causing this?
  2. mishnick

    mishnick 2000 Club Member
    Messages: 2,353

    Was it topped up with fluid recently? If its a Vplow you have to put it down all the way and move both blades all the way back to get as much fluid in the reservoir as possible. For a straight blade just drop it all the way. Then pull the plug on the back and fill it from the front or the top (depending on generation) until fluid comes out the back. If fluid comes out the vent plug (grey plastic cap) then it is way overfull. Put it in down / V and pull out the max level plug on the back and let it drain until it just drips then put the plug back in and good to go.

    In some cases it is possible that air is getting in the fluid and making it foam up raising the level. If this is the case it's a whole other situation but keep that in mind.

    Also not that if you are using blue plow fluid in an older model it may have a metal vent plug. When using plow fluid you MUST use the grey plastic vent / filler cap because it has a 5 lb psr relief valve in it. This stops the reservoir from breathing in and out preventing moisture from being absorbed by the fluid. In stead of breathing it keeps and air pocket in the top of the reservoir that expands and contracts like a bladder. The blue oil is a descant (absorbs water) whereas the older plows had a sticker that said fill with trans fluid which is not sensitive to water but gets thick when it's very cold.