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Lull Telehandler brake booster problem

Discussion in 'Forklifts/Telehandlers' started by bill klein, Jul 30, 2020.

  1. bill klein

    bill klein New Member

    Joined:
    Jul 18, 2020
    Messages:
    3
    Location:
    pa
    My Lull brake booster often sticks so that the only brake fluid that returns from the 8 wheel cylinders is the volume of the master cylinder- not the booster cylinder. The result is that not all the wheel cylinders release therefore a brake hangs up. I have removed the extension from the booster and worked the rod by hand (sometimes I find it stuck out and a gentle bump makes it jump back in) and the brakes work well for a few dozen times then it goes back to sticking. Any ideas onwhat could be causing this? Bill Klein
     
  2. Tenwheeler

    Tenwheeler Senior Member

    Joined:
    Dec 16, 2016
    Messages:
    599
    Location:
    Georgia
    Think I would be looking at the piston in the booster master cylinder. If the bore is not to bad maybe able to put a kit in it. Possibly just buy the cup seals from Napa. Parts maybe available from a local truck parts supplier or a reman from Bepco.
    I have had great service from JLG but parts are high.
    Look on line for a service manual. Some models have free PDF parts and service manuals.
     
  3. bill klein

    bill klein New Member

    Joined:
    Jul 18, 2020
    Messages:
    3
    Location:
    pa
    Thank you for the reply Tenwheeler. The booster cylinder was my 1st thought also but when I removed it from the front of the chamber the rod was still stuck out. I had to give the rod a bump before it retracted with a jump. Is there a shuttle spool or the like in the base that the cylinder extension screws in to? Bill Klein
     
  4. tool_king

    tool_king Senior Member

    Joined:
    Mar 29, 2010
    Messages:
    1,605
    Occupation:
    road mechanic owner
    Location:
    new jersey
    What model Lull do you have ? I can send you the manuals in pdf form .
     
  5. bill klein

    bill klein New Member

    Joined:
    Jul 18, 2020
    Messages:
    3
    Location:
    pa
    It is a TT644 Telehandler. Thank you.
     
  6. tool_king

    tool_king Senior Member

    Joined:
    Mar 29, 2010
    Messages:
    1,605
    Occupation:
    road mechanic owner
    Location:
    new jersey
    Do you have a picture of the machine with serial number you can email me at tool_king@hotmail.com .
     
    Last edited: Aug 2, 2020