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MM1 drop speed

Discussion in 'Fisher Engineering Discussion' started by DieselDriver, Jan 10, 2009.

  1. DieselDriver

    DieselDriver Junior Member
    from Ma
    Messages: 8

    Hey guys,
    Im wondering if there is anyway I can increase the drop speed of my blade? Mine seems to take 15 seconds or so to go all the way down. Its always been like this. Is there anything I can do?

  2. BigDave12768

    BigDave12768 PlowSite.com Addict
    Messages: 1,446

    Sounds like you have to much fluid in it. Drop it down so the piston its about an inch up from bottom. then check it. I bet yoiu will have fluid gushing out top. If thats not it you have a sticky valve.
  3. beatle78

    beatle78 Senior Member
    Messages: 175

    I'm not sure the term, but could it be that the packing nut on the lift piston is too tight?
  4. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    Why not turn the quill (drop speed adjustment screw) out? Thats what its there for. Didn't say which pump your MM1 has but....

    If it's a SEHP unit the quill is located on the top of the valve block. Should be a small screw that'll accept a straight blade screwdriver.

    If it's an Ista-Act unit the it'll be located just beside the pump motor on the left front of the valve block. Be sure to give it a good soaking of penetrating fluid before you attempt to turn it if it hasn't been turned for a while as they like to strip/break the slot out...making it impossible to then adjust any furtur.