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Speed of plow, Fisher MMI

Discussion in 'Truck & Equipment Repair' started by Deere444H, Nov 30, 2008.

  1. Deere444H

    Deere444H Junior Member
    Messages: 27

    Hi guys,
    So i have a 8 foot, MM1 on a 2000 f-350 superduty, it has an Insta-act Pump on it, and it seems to move slow, Up, Down, Left, and Right, I have changed the fluid, it has ATF-3 in it, and cleaned the screen/filter in the tank, It sounds like the motor is turning at a good clip. Checked the wires for resistance there is less than 5 ohms in the wires, and also performed a voltage drop on the motor circuit, there is only a small loss of about .28 volts in the circuit, so im not finding any wiring problems on the high current side. anyone have any ideas?? i mean it works, just slower than some of the new ones, or is this one being a little older supposed to move slower? also there is a screw. flat blade onthe top of the insta-act, left side, dose that have anyting to do with down speed? or by-pass pressure?
    thanks for any help..
  2. rbergevine

    rbergevine Member
    Messages: 62

    Yes, it is called the Quill. Turning it will change the speed. You can find detailed info on the Fisher website.

    Good luck
  3. Crash935

    Crash935 2000 Club Member
    Messages: 2,377

    Thats wrong, the quill only adjusts the rate of drop for the blade.

    I would check the pump pressure. Older plow just getting a little tired.
  4. Deere444H

    Deere444H Junior Member
    Messages: 27

    Hmm... i thought that was the quill. I looked in an older manual, and Kinda asumed, but that didnt seem to help drop speed, i turned it out once, any one have any ideas how much it normally needs to move?
  5. Flipper

    Flipper PlowSite.com Addict
    from CT
    Messages: 1,180

    You are both right and wrong, sort of.

    The quill does determine drop speed but the insta-acts also have a pressure relief adjustment which should be at teh right setting to give maximum pump performance. You really need a pressure guage to check it correctly. I would check the pressure anyway because you may need to replace the gear pump which is relatively easy to do.

    Having said that I have many SEHP packs still running original pumps. Powerpacks are disassembled eavery year, resevoir cleaned, screen filter cleaned, pumps seperated and cleaned, coil block cleaned and all lines flushed out. So you may just have to do a bit more service.
  6. Deere444H

    Deere444H Junior Member
    Messages: 27

    ok pump pressure should be easy with a hyd pressure gauge, is that in the manual on fishers site?? I may just take it apart and clean... But right now, im going to go look at fishers site.