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Unimount jerks or chatters angling left

Discussion in 'Western Plows Discussion' started by jimmyjam, Dec 19, 2010.

  1. jimmyjam

    jimmyjam Junior Member
    Messages: 25

    Having a recent problem with a unimount that is jerky when angling left. Will do this about 85 percent of the time and only when the plow is raised. If I drop it and angle it, doesn't seem to be a problem. Smooth angle right, and up and down. Seemed to have started this after changing fluid. thought it was just air so undid hoses, purged fluid and redid it. No luck. any thoughts? Thanks in advance
     
  2. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    Broken/collapsed spring or sticky spool in the poppet check valve assembly. The poppet and it's spring are behind the plug in the top of the valve block. And the spool and it's spring are behind the plug in the front of the block. Need to remove both and check them for smooth movement and inspect their respective springs.
     
  3. twinman326

    twinman326 PlowSite.com Addict
    Messages: 1,683

    Here are some diagrams

    Here were the poppet valve is
    poppy valve.jpg

    Here is the cushion valve
    cushvalve.jpg

    And just in-case you don't understand how they function
    poppycushvalves.jpg

    poppy valve.jpg

    cushvalve.jpg

    poppycushvalves.jpg
     
  4. jimmyjam

    jimmyjam Junior Member
    Messages: 25

    Thanks very much guys. Checked it out and was definitely a sticky spool. Had to pull quite hard just to get it out. I do have a follow up question though. Never had the spool apart before so don't know for sure what it should look like and can't find a real good exploded diagram. In the middle of the spool is a black O -ring gasket and what looks like a white spacer. On the one I removed that white spacer is split. Looks like it might be damaged but then again looks like it is manufactured that way in order to get it around the spool - anyone know what it should be like? Thanks again for the assistance - no more chatter!!!
     
  5. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    The spacer is supposed to be split as it's just the backup for the o-ring. Good to hear it's working.
     
  6. jimmyjam

    jimmyjam Junior Member
    Messages: 25

    Ok, great. Thanks again for your help - it was frustrating the heck out of me. Merry Christmas to you!
     
  7. twinman326

    twinman326 PlowSite.com Addict
    Messages: 1,683

    Happy holidays and safe plowing
     
  8. jimmyjam

    jimmyjam Junior Member
    Messages: 25

    Same to you and thanks for the diagrams - printed them out and they were perfect.
     
  9. B&B

    B&B PlowSite Fanatic
    Messages: 12,777

    If you're willing to trade a little printer ink for some good knowledge on your Uni I'd recommend printing off the entire mechanics manual here as you'll use it in the future I assure you.

    Just a little Christmas gift to carry you for seasons to come. :salute:
     
  10. jimmyjam

    jimmyjam Junior Member
    Messages: 25

    Yes, will do. Thanks again very much