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Belt driven Fisher

Discussion in 'Truck & Equipment Repair' started by tomtom, Feb 4, 2006.

  1. tomtom

    tomtom Junior Member
    Messages: 5

    Hi guys,
    I have a 1993 GMC Sierra 2500 with a Fisher belt driven 7.5' plow. When I raise the plow and let it sit, within 20 minutes the plow will have lowered an inch or so. (the other day I put it up all of the way and within a couple of hours it eventually lowered all the way to the ground) The same happens if I am driving around with the plow up every 15-20 minutes it will lower a little bit. Does that mean that I have a leak somewhere in the system? I checked the fluid in the pump and it is still full. I always park it in the same spot in the driveway and it doesn't leak anything. Any idea's ??? Thanks.:salute:

  2. RJ snow

    RJ snow Member
    Messages: 41

  3. Kentuckydiesel

    Kentuckydiesel Senior Member
    Messages: 151

    Sounds like your problem is that your valve is leaking past inside. I would tear it down and see if there are o-rings to replace. -Phillip