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Plow won't stay up

Discussion in 'Truck & Equipment Repair' started by Sabre124, Nov 2, 2014.

  1. Sabre124

    Sabre124 Junior Member
    Messages: 7

    Hi, I have a unimount electric control (not cable operated) the plow turns ok and lifts fine..plenty of power to lift but as soon as you let go of the control it falls...removed the valve the controls the lowering and cleaned and checked for debris ..looks ok...not sure where to go from here..thank you
     
  2. dieselss

    dieselss PlowSite Fanatic
    Messages: 10,973

    Last edited: Nov 2, 2014
  3. Sabre124

    Sabre124 Junior Member
    Messages: 7

    Ok did that and nothing changed..... This is where my thoughts went also..I removed the valve and cleaned the valve and verified it moves..it seems to move fine...is there something internally that could be letting fluid by? Thankyou for the help
     
  4. kimber750

    kimber750 PlowSite Veteran
    Messages: 3,669

    Try closing the quill all the way. If it stays up then replace S1 valve. If it doesn't you got something internal wrong.
     
  5. dieselss

    dieselss PlowSite Fanatic
    Messages: 10,973

    Another test would be to test light that s1 coil and make sure your not giving it power when your in raise
     
  6. Sabre124

    Sabre124 Junior Member
    Messages: 7

    When I get home from work today I will try closing the quill ..good call!! And I pulled the wires off of s1 to make sure nothing was giving it power..thanks again...I'll report back
     
  7. dieselss

    dieselss PlowSite Fanatic
    Messages: 10,973

    Was this happening all of a sudden, or did something lead up to it?
     
    Last edited: Nov 3, 2014
  8. Sabre124

    Sabre124 Junior Member
    Messages: 7

    i had the plow stored for the summer and when i went out to my property to pick it up this is what started happening to me...im seriously wondering if the s1 valve is somehow messed up...i did pull the valve apart and made sure it was clear and moving freely but whoknows maybe i missed something...i will try closing the quill all the way and see if it holds it up....looking at a hydraulic schematic online it looks as tho if i close it i wont be able to lift it while its closed...is this correct or am i missing something?

    thanks
     
  9. 1997chevy

    1997chevy Member
    Messages: 99

    Make sure the o rings are good on the valve too.
     
  10. dieselss

    dieselss PlowSite Fanatic
    Messages: 10,973

    The quill adjusts drop speed. So if you close it all the way, it may not drop.
    The valves are not serviceable tho, just o-rings and seals.
     
  11. Sabre124

    Sabre124 Junior Member
    Messages: 7

    ok i raised it upand ran the quill all the wary in and it still dropped but very slowly...so im guessing the s1 valve is bad
     
  12. dieselss

    dieselss PlowSite Fanatic
    Messages: 10,973

    You removed it before and looked at it correct? I thought you said you did.
    Replacing the s1 would be a good place to start
     
  13. Sabre124

    Sabre124 Junior Member
    Messages: 7

    yes i removed it, unscrewed the valve from the body and removed the plunger and springs cleaned and reassembled and re installed with all the same results....i thought it was moving freely..unless its worn inside and getting hung up...i can get one locally for 40 bucks... ill throw her in tomorrow and see what happens
     
  14. dieselss

    dieselss PlowSite Fanatic
    Messages: 10,973

    Only other thing would be to put it in the coil, and supply 12v to the coil and see if the valve moves properly. But that's not always that accurate. It'll at least give you an idea if the valve is moving
     
  15. kimber750

    kimber750 PlowSite Veteran
    Messages: 3,669

    S1 has an internal check ball. If this is not seating properly the plow will never stay up. Replace the valve.
     
  16. Sabre124

    Sabre124 Junior Member
    Messages: 7

    alright guys....i replaced the valve and bingo shes working great...thanks guys for all the help