Purging air from Fisher insta-act

Discussion in 'Fisher Engineering Discussion' started by rwgagnon, Jan 31, 2011.

  1. rwgagnon

    rwgagnon Junior Member
    Messages: 1

    Replaced the leaking reservoir on my 4 year old Fisher Minute Mount 2 hydraulic unit a couple of weeks ago. I lost about a 1 and 1/2 quarts of fluid in the process, and did find a small amount of sludge on the drain plug, which I cleaned. Filter and pickup tube looked good. Put it back together and topped off the fluid. I tried to purge the air by just running it up and down and side to side, holding at the end of the travel a few times. However, now the response to the joystick control is sluggish and jerky, where it used to be quick and tight before. I think there probably is still air in the system, but cannot find the procedure to purge it out. I have read Fishers flushing instructions, but it is too damn cold to do that whole process right now. Any advise would be appreciated.
  2. snowman123

    snowman123 Senior Member
    Messages: 205

    If it chatters when it moves right or left you are more than likely low on fluid.
  3. 2COR517

    2COR517 PlowSite Fanatic
    Messages: 7,112

    Just use it, it will eventually bleed. Some guys position the truck so they can get the blade pointed down. Like with the tires on parking stops, or on a sidewalk. That will help bleed the angle rams more effectively, quickly.
  4. MrPLow2011

    MrPLow2011 Senior Member
    from Boston
    Messages: 276

    Has a vent on tank. It should bleed out
  5. smelb1

    smelb1 Junior Member
    Messages: 8

    yeah i am having the same problem with my plow. The guy that had it before me put ATF in it so i changed it to the right fluid. I drained the lines completely and now i can grab on the plow when it is up and move the angle rams in about 2 inches or so.
  6. Arc Burn

    Arc Burn PlowSite.com Addict
    Messages: 1,141

    You need to let it sit for a while before you running it again,you can run it,you won't hurt it it will just take longer to bleed,let it sit for a bit,if you take the fill plug off and look inside you'll see thousands of air bubbles at the top of the resivoir,they need to settle or nothing is going to happen,I've installed brand new plows that have taken upwards of an hour to get right and then i've seen others take 2 minutes,be patient,you'll get it
    The Snow Punishers likes this.
  7. smelb1

    smelb1 Junior Member
    Messages: 8

    thanks for the reply. hopefully that will fix one of my problems. my other problem is with lifting. goes up half way and then struggles the rest of the way. could it be the solenoid?
  8. Arc Burn

    Arc Burn PlowSite.com Addict
    Messages: 1,141

    Not the solenoid,if it worked before this then it's still air in the system or your still low on fluid