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snoway plow dp question plz help

Discussion in 'Introduce Yourself to the Community' started by GTCPW, Feb 19, 2011.

  1. GTCPW

    GTCPW Junior Member
    Messages: 14

    hey, i'm new to this so plz excuse my ignorance, i recently bought a snoway blade
    25D105636 off a friend, dp used to work but now it won't, everything else works fine
    i checked the 4 way valve powers up and moves (magnetic) and the motor runs, but the plow lifts when dp is turned on, and down is pressed...i don't know how to test the pressure switch, the control box wiring is right as i have poured over all the manuals known to man, anybody else ever encounter thios problem?
     
  2. GTCPW

    GTCPW Junior Member
    Messages: 14

    anyone got any ideas??
     
  3. Schnabel Plowin

    Schnabel Plowin Senior Member
    Messages: 139

    When I had that problem with my 25, it was a corroded and loose wire coming out of the dp valve. It may need a new coil in it.
     
  4. Dlongerman

    Dlongerman Senior Member
    from IL
    Messages: 299

    post this in the Snow-Way forum you will get a better response! welcome to plowsite!
     
  5. basher

    basher PlowSite Fanatic
    from 19707
    Messages: 8,992

  6. Schnabel Plowin

    Schnabel Plowin Senior Member
    Messages: 139

    There isn't one.
     
  7. winged1dur

    winged1dur Senior Member
    Messages: 124

    :laughing:
     
  8. GTCPW

    GTCPW Junior Member
    Messages: 14

    i assume by snow way forum you men join the group snoway owners
     
  9. GTCPW

    GTCPW Junior Member
    Messages: 14

    wires all semm good, dp valve is working, the moving peice goes up when magnet is powered and drops down when no power....confused, how does the dp pressure switch work???
     
  10. Schnabel Plowin

    Schnabel Plowin Senior Member
    Messages: 139

    The red light on the controller is lighting up, right?
     
  11. basher

    basher PlowSite Fanatic
    from 19707
    Messages: 8,992

    Do you have a jack switch? are you sure the down pressure coil is getting 12 volts when you turn the down pressure on?
     
  12. GTCPW

    GTCPW Junior Member
    Messages: 14

    jack switch? must be for a jack leg i assume, dont have a jack leg. yup coil getting 12 volts and valve moving freely and light is turning on when dp turned on and down is pressed
     
  13. basher

    basher PlowSite Fanatic
    from 19707
    Messages: 8,992

    are you testing the valve with the coil or by hand? could be a bad coil, but it has to be the 4way valve that is the issue. Are you sure the coil is good? the valve could be stuck partly shifted and is not closing properly. Does it lower with out the DP on?

    I sent you the Gravity owners manual here is the Dp manual

    http://www.snoway.com/service/Owner Manuals/97100200E.pdf

    These are available on the Snoway site.
     
  14. GTCPW

    GTCPW Junior Member
    Messages: 14

    tried the dp valve with the coil and by hand, not sticking that i can tell, even took it an laid in on my heater vent fo 1/2 hour to see if there may be ice in it, but no change, seems perfect, without dp on it lowers fine, and everything else works fine.......can't figure it out. how does the dp pressure switch work? i know it makes the blade adjust to the surface being plowed, but how?
     
    Last edited: Feb 21, 2011
  15. basher

    basher PlowSite Fanatic
    from 19707
    Messages: 8,992

    From the owner's manual


    Down Pressure (DP) System
    The Down Pressure (DP) System consists of two
    separate but interactive electrical circuits, both controlled
    by the DP Toggle Switch.
    • 4-Way Valve - Controls fluid flow to and from the Raise
    Cylinder and establishes either a float or DP
    condition.
    • DP Pressure Switch - a pressure sensitive ON switch
    that controls the pressure available to the DP
    system by limiting the Motor run time in the DP
    mode.
    Electrical current is provided to the DP Toggle Switch
    center terminals (common) through the 14 Pnk wires from
    the Raise/Lower Switch "lower" terminals. The
    Raise/Lower Switch must be in the Lower position for the
    DP to be activated. The Raise/Lower Switch receives
    power through the 9 RED/BLK wire, any time the vehicle
    key switch is in the ACC or RUN position.
    Positioning the DP Toggle Switch to ON supplies power to
    the Indicator Light, and allows current to flow, through 11
    Blue wire, to the Four-way Valve. Current also flows from
    the DP Toggle Switch, through 12 Yellow wire, and
    supplies power to the Pressure Switch.
    • The 4-Way Valve, when energized, directs fluid flow to
    the rod end of the Raise Cylinder creating pressure
    in the Raise Cylinder and forcing the plow down.
    When the 4-Way Valve is de-energized (Down
    Pressure Toggle Switch in the OFF position) a
    spring returns the 4-Way valve to a open port
    position that opens all ports in the Raise Cylinder
    allowing the blade to float and follow the contour of
    the ground.
    • The DP Pressure Switch senses hydraulic pressure in
    the rod end circuit of the Raise Cylinder. When
    pressure falls below the Pressure Switch preset, the
    Pressure Switch closes and current is supplied,
    through 14 Tan wire, to activate the Motor Solenoid
    allowing the 12VDC Motor and Hydraulic Pump to
    create hydraulic pressure which is supplied to the
    rod end of the Raise Cylinder. When pressure
    increases the pressure switch opens and stops
    current flow to the Motor Solenoid which disrupts
    power to the 12VDC Motor.
    The down pressure system is protected by the DP Relief
    Valve. If, while in the DP mode, a obstacle is encountered
    forcing the blade up excess pressure will be created in the
    rod end of the Raise Cylinder. This excess pressure is
    relived to the sump by the DP Relief Valve. Once the
    obstacle is cleared the plow will lower back to the surface
    being plowed, lowering Raise Cylinder pressure, and the
    Pressure Switch will then close re-establishing correct DP
    system pressure.
    The down pressure system will be over ridden when the
    toggle switch is placed in raise, but will resume when
    placed back into float position.
     
  16. GTCPW

    GTCPW Junior Member
    Messages: 14

    ok so basically the dp pressure switch CANNOT cause the problem i'm having, but the valve and coil seem ok...how much should the valve move, put power to it and moves *about* 1/4 inch up inside, take power and instantly comes back down....valvebody dirty?, or is there a check valve or something sticky? think i will try flushing the system again
     
  17. basher

    basher PlowSite Fanatic
    from 19707
    Messages: 8,992

    Correct, why I never mentioned the hydraulic DP switch. The jack control switch or the control box switch COULD cause the issue but you stated the coil was receiving proper power at the proper time.

    Your issue is caused by a LACK of response from the DP valve not allowing the fluid to divert to the down side of the two way ram. Clean and flush all you want but the issue is the valve.

    If you use the owners manual and check the 12 volt path to make sure all the coils are being properly energized at the proper time then there is nothing left but the valve as it just diverts the raise function to a lower function
     
  18. GTCPW

    GTCPW Junior Member
    Messages: 14

    ok, sorry if i sounded stubborn but the valve is moving so i assumed it was moving enough, i'll have to go and buy a new one i guess, 3hr drive for parts i didn't want to go there and buy the wrong parts, is the valve sold seperate from the coil normally or package deal? doesnt really matter, just as well to have both i guess either could be problematic
     
  19. basher

    basher PlowSite Fanatic
    from 19707
    Messages: 8,992

    I understand and there could be something I'm not "seeing" remote diagnostics is difficult but the cause of your problem is the lift system is not diverting and if you have exhausted all the electric possibilities that leaves only the valve
     
  20. GTCPW

    GTCPW Junior Member
    Messages: 14

    yeah you're right, i mostly didn't understand how the dp pressure switch worked, i was thinking that somehow it was connected to making the actual downpressure, i read manual but it didn't click until you posted it....jeez i feel dumb...LOL