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Painful Fisher

Discussion in 'Fisher Engineering Discussion' started by Tomas090, Dec 22, 2008.

  1. Tomas090

    Tomas090 Member
    from Maine
    Messages: 63

    Help! Fisher slow and groaning


    First big storm (14") and this plow is driving me nuts

    Not only is it slower than death, but as you use it more and it gets "hotter" it gets slower.

    It also has developed a pronounced "groan" when angling left and goes even slower than its normal slow no matter how you rev engine When you angle left it sounds almost like metal being bent

    Fluid is full but looks a bit "foamy" and when I tried to take filler cap off with pump running there was too much pressure to remove cap by hand

    Control stick seems very sloppy, maybe just break in (Was a new joystick and cables)

    Any thoughts would be most appreciated, I didn't get to finish my own driveway and am buried
    1995 Full Size 2 door Blazer
    350 Auto
    1980 something 7.5 Speedcaster
  2. mc1

    mc1 Senior Member
    Messages: 171

    i would start by changing fluid first take the bottom of the pump off and look at the filter replace if looks bad then if those do not seem to help i would take the magnet valve thing on the back apart and check nothing plugging orifice and that the magnets are moving back and forth as they should
  3. Tomas090

    Tomas090 Member
    from Maine
    Messages: 63

    I'm not familiar with the magnets valve, is this on a belt driven pump?
  4. mc1

    mc1 Senior Member
    Messages: 171

    no mm1 mm2 pumps i didnt know you had a belt drive sorry!!!
  5. daninline

    daninline Senior Member
    Messages: 430

    change the fluid 1st for sure, but I had one where the valve body was shot it would go up slow and creep down when driving. Also check that you set the cables up right maybe your not opening the valve body all the way.
    Also if it's has a filter it could be clogged I have seen then on the hose and right on the valve body.
    Check the belt make sure it's real good and tight.
    Last thing the pump is shot or dirty. I was told by a Fisher Dealer to take it off and wash it with gas and then drain it out and put it back on the truck.

  6. Tomas090

    Tomas090 Member
    from Maine
    Messages: 63

    Haven't had chance to do much yet, BUT the plow works "normal" (Still slower than death but no moaning etc) when it is cold? Fluid breaking down or pump dying?

    Will change fluid per instructions in another thread then give a go

    I have an older Fisher belt-drive pump, too.

    Annual flushes are the recommended procedure for removing old fluid.

    If I were you, here's what I would do.

    1) Suction as much old fluid out of your pump as you can (not absolutely necessary but helpful)

    2) change filter (or install one if you don't have it--Fisher sells kit) on low-pressure return line

    3) unthread hoses from angle rams, manually angle plow back and forth, collapsing each cylinder in turn, to push out old fluid from cylinders (disassemble, clean, and replace packings of cylinders if you want to be thorough, but not necessary unless you have leaking)

    4) fill reservoir with fresh ATF

    5) hook up one angle ram hose to its coupling on the headgear (to the end of one of the hoses running from the valve body, in other words), insert the other end into an empty gallon container

    6) fire up the motor, move your control lever to the side (as if you were going to angle the blade), and flush out about a pint of fluid, or until you see fresh clean fluid coming out; then do the same with the other hose (top off the fluid first!); finally, unthread the lift ram hose from the swivel fitting at the bottom of the lift ram, insert the hose into your gallon container, and flush that out.

    7) You should now have nothing but clean fluid in your system. Mount the blade, hook up all the hoses and bleed the system of air (to do this, I just lift the blade up, attach the carrying chain, lower the blade so that it's off the ground but the lift cylinder is fully collapsed, and then angle all the way to one side, top off fluid, angle all the way to the other side, top off fluid, and then angle back and forth a few times. Check fluid one last time when you're done.

    8) Make sure there are no leaks anywhere.

    It goes without saying that you replace any worn hoses, check your drive belt and replace if worn, adjust it properly, etc.