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Fisher Plow won't lift - Whining Noise From Motor

Discussion in 'Fisher Engineering Discussion' started by awjbos, Jan 7, 2013.

  1. awjbos

    awjbos Junior Member
    from CT
    Messages: 3


    I'm hoping you guys can help me out.

    I have what I believe is an SD series Fisher Minute Mount I Plow mounted on my Dodge Ram 1500. The plow is 26 inches high and 90 inches wide, I believe it is the SD series.

    After the recent snowstorm here in CT the plow suddenly refused to lift. When I hit lift on the controls, I hear a whining noise at the top of the motor.

    I cleaned all the terminals with a brush and connections with contact cleaner. The motor seems to have power, but for some reason is not lifting the plow.

    Any ideas? I have no way of taking this thing in for service, so I'm willing to try anything.

    I have uploaded a video showing the noise and problem here:


    Last edited: Jan 7, 2013
  2. LON

    LON Senior Member
    Messages: 749

    sounds like a broken gear in the pump. Gonna have to take it down and see.
  3. quigleysiding

    quigleysiding PlowSite.com Addict
    Messages: 1,129

    Did you check the fluid?
  4. awjbos

    awjbos Junior Member
    from CT
    Messages: 3

    I have left/right motion, just not up/down.

    What is the best way to check the fluid? There are no signs of leaking.

    Here is a video showing the problem and noise:
    Last edited: Jan 7, 2013

    FISHERBOY Senior Member
    Messages: 542

    check the pickup in the tank, u need to take the pump off, remove the reservoir tank, and its also a good idea to clean the tank, and check the filter. just don't use ATF fluid, fisher fluid, or SAM blue works as well
  6. awjbos

    awjbos Junior Member
    from CT
    Messages: 3

    This is the closest thing I could find to a service manual for this plow:

    Please tell me if I'm looking at the wrong manual.

    For the symptom "Snowplow won’t raise—motor runs." they describe several things to check:
    - Lift cylinder packing nut too tight
    - Clogged pump filter (all functions are affected).
    - Worn or damaged pump.
    - Poor connections on battery cables.
    - Solenoid valve coils not energizing properly.
    - Hydraulic system malfunction.
    - Defective control.

    Would you mind explaining what you meant by don't use fisher fluid? Are you talking about the type of hydraulic fluid that I should put back in? Would you mind giving me a little more info?
  7. 2006Sierra1500

    2006Sierra1500 PlowSite.com Addict
    Messages: 1,758

    If its doing that and the lift arm is up like that, the plow won't go up any higher. From your pictures it looks like its at the end of the ram stroke.

    EDIT: The video says otherwise.
  8. Why is the lift piston all the way up? Sounds like it has air in it to me.

    What he said was don't use ATF. Use the Fisher Blue.
  9. RepoMan207

    RepoMan207 PlowSite Fanatic
    from Maine
    Messages: 5,039

    Okay, a few things, and this is soley of assumption, but from my observation (and others)...If there was fluid present I would say your issue would be the ram assembly and seals...but it appears dry. After looking at the video and pictures, it looks like...and I could be wrong here, but it appears that you removed the chain from the A Frame??? That would mean...and it appears, that it's topped out. You state that you can't lower it as well? Assuming (I know...) that is what you did, because you in fact couldn't lower it, the S1 valve is not operating, The ram appears to be at full stroke, so it obviously won't go any higher.

    Remove the black cover on the back side of your pump to access your cartridge valves and solenoids. Inspect the wiring at each spade terminal, are they pinched on well enough for a good connection? If so, turn your ignition to the on position, power the controller, and hold the down button for a few seconds until it's in float mode. Now take a screwdriver and place it against the S1 coil, is there magnetic pull?

    Last edited: Jan 8, 2013
  10. jday53

    jday53 Junior Member
    Messages: 8

    corect me if im wrong?

    Is your chain undone on the a frame? your lift pistons all the way up and your plows in on the ground???? am i missing something?
  11. 2006Sierra1500

    2006Sierra1500 PlowSite.com Addict
    Messages: 1,758

    Looks disconnected or REALLY out of adjustment
  12. Snow Commandor

    Snow Commandor Senior Member
    from 07666
    Messages: 443

    Clearly based on the pictures and video, your lift ram is fully extended! You need to push the lift ram down to the fully collapsed possition, then re adjust your chain. With the lift ram fully collapsed, check your fluid level and top off if needed. Once you've completed these steps you hopefully should be back in bussiness.