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MM1 insta act slower than MM2?

Discussion in 'Fisher Engineering Discussion' started by plowguy43, Oct 22, 2010.

  1. plowguy43

    plowguy43 PlowSite Fanatic
    Messages: 5,281

    Hey guys over the summer I bought a MM1 insta act 3 plug setup. Log story short, it seems slower than my old SEHP MM1 and definitely is slower than a MM2 I tried out last week (test drove a chevy crew cab at a dealer).

    I'm wondering if its normal because I don't thik it is. I'm going to change the fluid and screen this weekend (and sandblast and repaint) but is there aything else to check?
  2. 2COR517

    2COR517 PlowSite Fanatic
    Messages: 7,115

    Check the voltage at the pump while lifting the blade.

    Be careful......
  3. plowguy43

    plowguy43 PlowSite Fanatic
    Messages: 5,281

    I'll clean all the connections tomorrow. It doesn't sound weak or anything. I'm thinking maybe the fluid is real old/thin or the screen is gunked.
  4. TONY labounty

    TONY labounty Junior Member
    Messages: 11

    electric motor could be getting stuck in the brass bushing or the pump relief valve out of adjustment
  5. bullit340

    bullit340 Member
    from Mass
    Messages: 87

    I always thought my old mm1 instact was slower than my newer xblades. Today I tore down the mm1 motor/pump assy. I installed a new motor, new pump, new screen and cleaned all the selenoid connections etc... new atf and sure enough it is still slow. I am also looking for a reason why? Selenoids usually are working or not, thats the only thing left to change, but its a few hundred for complete selenoids and valves. Kinda a lot just to throw parts around. Any ideas?
  6. plowguy43

    plowguy43 PlowSite Fanatic
    Messages: 5,281

    Well I found that my positive side of my plow harness/cable was split open and may have been rubbing against the plow frame. Either way I repaired it and will see if it was the problem. I won't find out until at least a week or so since I'm in the middle of redoing it now.