1. Thank you for visiting HeavyEquipmentForums.com! Our objective is to provide industry professionals a place to gather to exchange questions, answers and ideas. We welcome you to register using the "Register" icon at the top of the page. We'd appreciate any help you can offer in spreading the word of our new site. The more members that join, the bigger resource for all to enjoy. Thank you!

Lull joystick

Discussion in 'Forklifts/Telehandlers' started by tractormech, Feb 8, 2020.

  1. tractormech

    tractormech Well-Known Member

    Joined:
    Feb 19, 2015
    Messages:
    68
    Location:
    florida
    Does anybody know where a replacement joystick can be had for a 644b-42
    lull? I believe it's a parker.
     
  2. icestationzebra

    icestationzebra Senior Member

    Joined:
    Jun 21, 2009
    Messages:
    320
    Location:
    WI
    Did you try JLG?

    FYI - Some of the pilot operated joysticks have different metering and spring options, so you might end up with a different feel even if it is the same brand.
     
  3. tractormech

    tractormech Well-Known Member

    Joined:
    Feb 19, 2015
    Messages:
    68
    Location:
    florida
    Yes I did. My dealer said it's no longer available from JLG.
     
  4. mikebramel

    mikebramel Senior Member

    Joined:
    Jul 16, 2012
    Messages:
    1,539
    Location:
    milwaukee
    Whats wrong with it
     
  5. tractormech

    tractormech Well-Known Member

    Joined:
    Feb 19, 2015
    Messages:
    68
    Location:
    florida
    It will boom up and extend on it's own when you rev it. You can wiggle the joystick and it will stop when it gets just right but next function operation it gives trouble again.
     
  6. mikebramel

    mikebramel Senior Member

    Joined:
    Jul 16, 2012
    Messages:
    1,539
    Location:
    milwaukee
    The springs are weak or there isnt enough end play
     
  7. tractormech

    tractormech Well-Known Member

    Joined:
    Feb 19, 2015
    Messages:
    68
    Location:
    florida
    JLG doesn't offer anything to service the valve anymore. Since Lull went out of production support is going away quickly. I may have found a source for a joystick.
     
  8. mikebramel

    mikebramel Senior Member

    Joined:
    Jul 16, 2012
    Messages:
    1,539
    Location:
    milwaukee
    Yeah, you can probably fix the one you have
     
  9. willie59

    willie59 Super Moderator

    Joined:
    Dec 21, 2008
    Messages:
    12,354
    Occupation:
    Service Manager
    Location:
    Knoxville TN
    Has it always been this way or did it just recently start doing this?
     
  10. tractormech

    tractormech Well-Known Member

    Joined:
    Feb 19, 2015
    Messages:
    68
    Location:
    florida
    It's been acting up for a while. It stays on the beach usually and the rubber boot is gone and the salt air and blowing sand wreak havoc on these things. And it's 23 years old to boot. are you familiar with Lulls?
     
  11. willie59

    willie59 Super Moderator

    Joined:
    Dec 21, 2008
    Messages:
    12,354
    Occupation:
    Service Manager
    Location:
    Knoxville TN
    Beach, salt, yeah, I can see all sorts of problems coming from that environment, like sticking spools of the joystick valve from salty environment. With the machine not running, how does the joystick feel? Does it feel "held in center", or does it have slack side to side or fore and aft before you feel contact with a spool of the joystick valve?
     
  12. tractormech

    tractormech Well-Known Member

    Joined:
    Feb 19, 2015
    Messages:
    68
    Location:
    florida
    As I remember it does feel centered but I'm not 100% certain at the moment. I'm chasing a pilot pressure problem too. You hear the hydraulics kick in and the joysticks will work. When it "kicks out" they quit. It cycles in and out.I may need to check the accumulator pressure but I've not seen an accumulator cause this issue.
     
  13. willie59

    willie59 Super Moderator

    Joined:
    Dec 21, 2008
    Messages:
    12,354
    Occupation:
    Service Manager
    Location:
    Knoxville TN
    Me either. Lull machines typically make sound changes in engine when charging the accumulator, comes and goes at a pretty regular time rate, that's normal. But Ive never seen a Lull lose hyd functions one way or the other related to the accumulator charging.
     
  14. tractormech

    tractormech Well-Known Member

    Joined:
    Feb 19, 2015
    Messages:
    68
    Location:
    florida
    Right-I've seen them pulse from internal leakage or bad accumulator but not stop and start altogether. There's a valve on the pump that can go bad that's very expensive. I'm still troubleshooting it. Wish I had a known good valve to stick on it and check it.