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The JLG 40F Boom Lift Dilemma

Discussion in 'Other Construction/Demolition Equipment' started by od1, Sep 13, 2009.

  1. bail

    bail New Member

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    hi I see this is an old thread but I happen to be looking for some manuals for the 40f as well
     
  2. OFF

    OFF Senior Member

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    Hello Bail, welcome to the Heavy Equipment forum! I'll do my best to hook you up with those manuals.
     
  3. bail

    bail New Member

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    thanks I would appreciate it a lot, I have a machine that worked great until today when it decided to steer in one direction only.
    I'm not sure how to differentiate between the different types of valves< bertea and racine? thanks again
     
  4. OFF

    OFF Senior Member

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    Well, all the steer valves in 40F's were Racine, referred to in this thread as "bang-bang" valves. Most common problem would be a bad ground or broken wires at the valve coils. Usually located in a stack of 3 valves on the same side of the machine where the hydraulic tank is located. manuals sent
     
    tickman likes this.
  5. OFF

    OFF Senior Member

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    @bail Check the steer toggle switch first.
     
  6. bail

    bail New Member

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    IMG_2244.JPG IMG_2246.JPG IMG_2246.JPG hey Im not sure what you mean by steering toggle, I do have a steering select toggle below the main control panel but I only have one steering axle. the drive axle is fixed in place by factory as far as I can tell. I will take some more photos of the control panel and ground control panel later to show you what a mess it is. I enclosed some photos of the steering/drive joystick. I don't recognize these from any of the options in the manual, I'm assume multiple people have worked on machine over the years. do you recognize this joystick? one of the little springs was just laying in the bottom so I put it back in thinking that would fix it...haha wishful thinking.
     
  7. OFF

    OFF Senior Member

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    wow, that's really old! One of the first JLG's, they made their own controllers for a while.
    Good news is, that controller is made up of 4 very common micro switches, and most likely one of them failed. Check the power into and out of the micro switch that moves - when you steer the direction that no longer works. That will tell you whether your problem is a control, or further down the line.

    Later JLG's used a spring loaded (return to center) toggle switch for steering. It would be quote easy to convert your machine to a toggle on the dash for steering. All you'd need is an unused hole.
     
  8. SteelLady

    SteelLady New Member

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    I happen to be looking for some manuals for the 40f as well if any one would mind sending them to me. I am looking for safety stickers(decals) also.
     
  9. OFF

    OFF Senior Member

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    Hello, and welcome to the Heavy Equipment Forum. I have the manuals you need, and I still have some of factory function & safety decal/plates for these machines. Let me know which ones you're looking for.
     
  10. landon baker

    landon baker Member

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    new owner of a 40f and don't know much about them. i'd also really appreciate the wiring diagrams if you don't mind sharing. I bought mine needing a head gasket which turned into needing a motor. I put a 30hp diesel in it. got it running but as soon as I start it the boom starts to go up. and that's about all the movement I get out of it. it did swing left one time from the ground box. the bucket controls aren't doing anything. my email is landonbaker71@yahoo.com if you could send me any info id really appreciate it.
     
  11. OFF

    OFF Senior Member

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    @landon baker I'm on it. I'll send them tonight when I get home from work.
     
  12. dbris

    dbris Active Member

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    Does anyone know what the tire pressure should be on the 40f? The stickers that should have the pressure on them are gone and the manuals don't seem to say. Also what diameter are the valve stems? they're bigger than automotive so I'm guessing .625"?
    Other than tires, the old lady is still limping along!
     
  13. OFF

    OFF Senior Member

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    I'd go a minimum pressure of 50 PSI, maximum 65 PSI.

    There are two sized of common valve stems, .453 and .625, any tire shop should have lots of them.
     
  14. dbris

    dbris Active Member

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    Thanks Off, I guess it's the bigger one then, the tire shop said they didn't carry them. And of course I now have one leaking around the base!
     
  15. Gus71

    Gus71 New Member

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    My 40F has 72psi posted by each wheel. These appear to be stenciled on and not decals so I don't know if it's right or not.
     
  16. OFF

    OFF Senior Member

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    that tire shop must do nothing but passenger car tires. Try another one. They aren't uncommon at all. Try a NAPA store, they sell them too.
    These are good ones.
    https://www.napaonline.com/en/p/NTH90438
     
    Last edited: May 16, 2019
  17. OFF

    OFF Senior Member

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    depending on how many ply the tires were, it could be correct. I was playing it safe. :D

    If you've ever had a tire "zipper" on you while filling it up.......you learn to respect the rubber.
     
    Last edited: May 16, 2019
  18. dbris

    dbris Active Member

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    It's great to see that folks are still watching this thread! It's been my number one place for 40F info for almost 10 years. Thanks guy, especially off!
     
    OFF likes this.
  19. dbris

    dbris Active Member

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    Message removed
     
  20. Gus71

    Gus71 New Member

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    Anyone know where I might find rubber boots for the Racine style joysticks?