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Plow whines and moves but times out

Discussion in 'Fisher Engineering Discussion' started by DJs Lawncare, Nov 15, 2007.

  1. DJs Lawncare

    DJs Lawncare Member
    Messages: 90

    I have a 2000 Ford F-250 with a 7'5" minute mount 1 plow. I went to put the plow on this year and the motor/pump whines when I try to lift the blade. The fluid looks to be alright. The blade moves up a little but to get it up about 6" you have to hold the up button until it "times" out and do it again 2 more times. Also last year a few times when we were running the plow the voltage would drop down to 8 volts sometimes killing the battery. I replaced the battery since then. Any ideas as to what it could be or what to check?
  2. streetsurfin'

    streetsurfin' Senior Member
    Messages: 770

    I would pull the motor and check the bushings. Sounds like the armature may be shorting causing the excessive draw. I remember it being more of a growl though, but maybe it did whine at the start of mine going bad.
  3. DeereGuy

    DeereGuy Senior Member
    Messages: 346

    The last time that happened to me it was on a fairly new Fisher. Short chained it and brought it to the dealer in the middle of a snowstorm. Turns out the fill tube fell into the resiviourf(sp). You know what I mean. Starved for fluid it made that whining noise with no hydro working. For what it's worth
  4. mcwlandscaping

    mcwlandscaping 2000 Club Member
    Messages: 2,557

    is this an insta-act or an hvlp system?
  5. DJs Lawncare

    DJs Lawncare Member
    Messages: 90

    Its an inst act hydraulics
  6. Brian Simmons

    Brian Simmons PlowSite.com - Sponsor
    Messages: 196

    Couls be pickup tube or low pump pressure. On the passenger side of the block will be two relief valves. Screw the one on the bottom closest to the reservoir all the in and backout 2 1/2 turns. This resets it to factory settings.
  7. chaseatg

    chaseatg Member
    Messages: 94

    You might also have a early insta act hyd pack. Pull the motor off and locate the boss plug located under the motor, check to see if there is a spring and ball under the boss plug, if so remove them.
  8. DJs Lawncare

    DJs Lawncare Member
    Messages: 90

    Well I pulled the filter and cleaned some debris off of it. I changed the fluid in the spring but I don't know if it got crap in it over the summer, It goes up now. But if you hit left it goes up and right does nothing.
  9. streetsurfin'

    streetsurfin' Senior Member
    Messages: 770

    I guess you can ignore my earlier suggestion about motor bushings then. I was thinking it was the SEHP. Now what you describe sounds like a problem in whatever is regulating oil flow...the spool valves or what controlls them. Itg sounds like within the valve body but I am not familiar with insta-act. Spool valves that get a piece of debris in them or have a nicked seal or o-ring can hang in between their proper positions and send oil in the wrong or multiple directions.
  10. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    Your S2 valve isn't functioning..
    It'll go up instead of left and it will not angle right if the S2 doesn't open..
    Check the coil for magnetism with the control held in the angle right position.

    If it has magnetism, pull the valve and check the spool with a small screw driver to see if it will move..

    If it doesn't have magnetism, first check for power and ground at the coil. If no power, then check it at the grill connector pin.
    The S2 is the one in the middle of the three valve's. (Lt. green wire)

    For some reason, it seems that when you have a valve problem with an Insta-act pump, it's always the S2 valve...
    Last edited: Nov 17, 2007
  11. Sounds like he's got the classic wiring harness problem. They all do that when the wiring harness fails. I've seen it at least 15 times in 3 years. Unless it's under warranty Fisher won't help you.
  12. DJs Lawncare

    DJs Lawncare Member
    Messages: 90

    Yup finally brought it to the shop yesterday. The main harness from the truck (3 pin) was bad. They had to replace the end. It is working fine now. Thanks for everybody's help.