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Air in hydraulic system?

Discussion in 'Fisher Engineering Discussion' started by FordFisherman, Dec 5, 2007.

  1. FordFisherman

    FordFisherman PlowSite.com Addict
    from 06611
    Messages: 1,613

    I just did the annual fluid change on my 8' MM2; when I removed the drain plug the fluid shot out like it was under pressure? Never happened before...Any ideas?
  2. ashsupply

    ashsupply Junior Member
    from nh
    Messages: 26

    Try removing the fill plus first or you can take the vent off first.
  3. BJH Snow

    BJH Snow Senior Member
    Messages: 142

    I had that happen to me last winter and found that I had air in my hydrolic lines. After an evening of plowing, I brought the truck home and refilled the SEHP pump they way Fisher instructs you to do it in their manual. I jacked up my truck off the ground and lowered the blade as far as it would go down, (with the fill plug out) and angeled the blade back and fourth, up and down. Them I filled the pump back up, replaced the filler bolt and had no problems the rest of last year nor the start of this year.
  4. Grn Mtn

    Grn Mtn PlowSite.com Addict
    Messages: 1,644

    fill plug or vent cap?
  5. crossboneracing

    crossboneracing Senior Member
    Messages: 137

    Im having the same problem too. So you went up down and side to side with the fill plug out? I just cant seem to get the air out either! I have the older style pump its not an insta act. Let me know what you guys think this is real annoying!