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unimount moves/lifts slow. Heat appiled works just fine.

Discussion in 'Western Plows Discussion' started by dieselboy01, Dec 8, 2013.

  1. dieselboy01

    dieselboy01 Senior Member
    Messages: 771

    Hooked my unimount up today and it lifted and angled very slow. Fluid level was good. The plow worked fine last storm. I took a heat gun and warmed up the pump and everything worked just fine the rest of the day. This happened last year too, I changed the fluid and worked fine the rest of the season. I'm wondering why it works after I heat the pump up? Am I getting water in the fluid and its freezing? Is my pump or motor dying? Any help would be great. Thank you.

  2. kimber750

    kimber750 PlowSite Veteran
    Messages: 3,152

    Contaminated fluid, water in fluid or wrong fluid. These are the most likely culprits. When was the pump filter last cleaned?
  3. theguynextdoor

    theguynextdoor Senior Member
    Messages: 307

    I had a unimount that did the same thing. It was fine after it warmed up in he garage. The packing nut and seals in the lift cylinder were bad, allowing water to mix with the fluid. Check the chrome on the lift ram if you change the seals because a pitted ram will tear the new seals. Also disconnect the hoses from the pump and work the plow back and forth by hand to push all the fluid out of the angling cylinder. If you only drain the pump reservoir, you'll leave contaminated fluid in the hoses and cylinders.
  4. dieselboy01

    dieselboy01 Senior Member
    Messages: 771

    The fluid and filter were changed late last season. I run the S.A.M low temp blue fluid. The angle rams are pitted. I have new rams Ill be putting on tomorrow (later today) along with a new filter, and motor gasket. Ill drain all the fluid and hoses and go from there. Thanks for the advice!!
  5. dieselboy01

    dieselboy01 Senior Member
    Messages: 771

    Every thing seems just fine with the plow now. I'm hoping the new rams fix the water problem.

    Does anyone know if there is suppose to be a breather on a unimount? I don't see one anywhere.
  6. jasonv

    jasonv PlowSite.com Addict
    from kannada
    Messages: 1,114

    All hydraulic systems need to have some kind of breather. Usually on the fill cap for the hydraulic reservoir. If the problem isn't cured, add a little gas line antifreeze to the hydraulic fluid to deal with the ice problem.
  7. kimber750

    kimber750 PlowSite Veteran
    Messages: 3,152

    The isarmatic pumps do not have breathers.
  8. dieselss

    dieselss PlowSite Fanatic
    Messages: 10,739

    Unimounts do not have breathers. Completly sealed units. Same as the cable style.
  9. dieselboy01

    dieselboy01 Senior Member
    Messages: 771

    Ok thanks. I'm assuming they don't need one then.