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Hiniker 9850 power unit

Discussion in 'Truck & Equipment Repair' started by JJ White, Feb 22, 2015.

  1. JJ White

    JJ White Junior Member
    Messages: 1

    Hello, I'm operating a Hiniker 9850 V plow with S203T 5051 power unit. The power unit pump now runs continuously (never stops unless I pull 2 conductor power cable), all functions of the plow Up/down/V/Sc work as per normal however the damn pump wont shut off, causing extreme voltage drop. Does this sound like a solenoid, a relief valve, or possibly a blown O ring somewhere? The fluid is good, and a cursary check of the wires didn't reveal any loose connectors or worn/exposed wires. Any ideas, or possible starting points before I start ripping parts off? Thanks


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  2. Camden

    Camden PlowSite Fanatic
    Messages: 6,604

    I can't speak specifically for Hiniker plows but when my Western MVP ran continuously it was due to a faulty solenoid. I stuck a new one on and haven't had any trouble since.
  3. SnoFarmer

    SnoFarmer PlowSite Fanatic
    from N,E. MN
    Messages: 9,883

    Well that was helpful as its not a western...

    I actually have a Hiniker

    Another thing you could take a look at is the solenoid under the hood.
    Last edited: Feb 22, 2015
  4. dieselss

    dieselss PlowSite Fanatic
    Messages: 11,392

    The solenoid sounds like it's the culprit
  5. CamS

    CamS Junior Member
    Messages: 8

    My plow did the same thing just replace the solenoid under the hood and you will be good.
  6. maxwellp

    maxwellp PlowSite.com Addict
    Messages: 1,123

    Most likely it is the solenoid. You could take the control wires off the solenoid and then plug it back in. If the pump still runs the solenoid is bad. If it does not run you have a control problem.