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  1. #1
    Doug W is offline Hot Rolled
    Join Date
    Sep 2003
    Location
    Pacific NW
    Posts
    581

    Post

    I replaced the handle pivot pin on my jack. Didn't know that was all that kept the piston in. So the piston popped out while I was machining a new pin. I lost all or most of the hydraulic oil.

    I don't have the manual, but managed to refill the pump. Now it will raise with one pump but lowers on the up stroke. So I assume air is trapped in the system somewhere??

    Tried bleeding but not sure how to do it??
    It is a Dayton 4YX96.
    likehere

    Any help? Grainger doesn't have a online manual for it.

    thanks Doug

  2. #2
    bspooh's Avatar
    bspooh is offline Cast Iron
    Join Date
    Jun 2002
    Location
    Salt Lake City, Utah USA
    Posts
    313

    Post

    doug,

    Those pallet jack cylinders shouldn't need bleeding..The ones that i have worked on will bleed themselves..the resevoir is open to the atmosphere, so that doesn't seem to be your problem..

    It sounds like you might have some crap inside the system which is not allowing the steel ball to seat properly..

    the steel ball is designed to shut off a port on the down stroke of your handle..

    brent

  3. #3
    gmatov is online now Diamond
    Join Date
    Feb 2006
    Location
    SW PA
    Posts
    5,495

    Post

    I think you lost a steel ball valve, entirely. Maybe 2, but at least 1 or mebbe just a spring return.

    Most have 2, some have 3 ball valves. Intake, pressure, and some have a ball as the release valve, others use a needle valve.

    Here's an animation of how a jack works. It is the same as how yours works.

    http://www.hyjacks.net/animation.htm

    Cheers,

    George

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