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MM2 Pump Motor R&R

Discussion in 'Fisher Engineering Discussion' started by jshocik, Dec 17, 2013.

  1. jshocik

    jshocik Member
    Messages: 52

    Hi, I think I need a new pump motor on my MM2 straight X Blade plow. When I hooked it up a few days ago to make sure everything worked, the plow wouldn't move, just click. After tapping on the motor with a hammer, it worked, but it makes a lot more noise than before, & is a little hesitant moving the plow at first. I tried looking at past threads here to see if anyone else had the same problem, & I see some guys did, with the most common repair replacing the motor as the hammer repair method will only work so long.

    After viewing a schematic of the plow pump & motor, it appears there are only 2 long bolts holding the motor to the pump. My question is changing the motor this easy? I'm hoping to hear from someone who has changed a pump motor. Thanks in advance. :help:
  2. dieselss

    dieselss PlowSite Fanatic
    Messages: 11,390

    IF the bolts come out then yes its that easy. 2 wires and the 2 bolts.
  3. jshocik

    jshocik Member
    Messages: 52

    What do you mean "IF" the bolts come out? Will they break? Should I get replacement bolts while getting a replacement motor?
  4. dieselss

    dieselss PlowSite Fanatic
    Messages: 11,390

    Yea they might break. Steel bolts, aluminum housing. Add water salt and put electricity through it. Rust corrosion is a lumming fact
  5. TJS

    TJS PlowSite.com Addict
    Messages: 1,440

    Yes. Hopefully the bolts will come out without breaking. Getting new bolts is not the issue. The issue is getting the broken bolts out of the manifold/block without ruining it. I have done about 4 or 5 (removing the broken bolts that is) for other people. Also get yourself a new shaft seal when replacing the motor. They are cheap. the seal resides in the manifold.

    This is one of the main reasons I made a cover for my pump. I posted it somewhere on here. Although not a Fisher pump. It is a Fenner pump but mounted the same way.