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!
  2. ALL NEW MEMBERS READ THIS FIRST!! Thank you for joining Heavy Equipment Forums! If you are new to forums we communicate with "Threads", please search our threads to see if your topic may have already been answered and if not then click "Post New Thread" in the appropriate forum. This will allow all of our members to see your question and give you the best chance to be answered. After you've made a number of posts you will graduate to Full Member status where you'll see a few more privileges. Following these guidelines will help make this the best resource for heavy equipment on the net. Thanks for joining us and I hope you enjoy your stay!!

The JLG 40F Boom Lift Dilemma

Discussion in 'Other Construction/Demolition Equipment' started by od1, Sep 12, 2009.

  1. TheBigDog

    TheBigDog Member

    Joined:
    Jun 2, 2021
    Messages:
    11
    Location:
    Ohio
    @OFF, I forgot to thank you for the info....it is working again!

    Also, is there a place to look up the serial number to verify the year it was made?

     
  2. OFF

    OFF Senior Member

    Joined:
    Sep 30, 2009
    Messages:
    922
    Occupation:
    HD Mechanic
    Location:
    Alberta, Canada
    You're very welcome, I'm always glad to help.

    The only way I know of to date an old JLG serial number is to contact JLG or have a friendly JLG dealer contact them for you.

    All my old contacts are dead by now I'm sure, and we went Genie in about 1990, so I haven't made any new JLG contacts. :)
     
  3. Jwells

    Jwells New Member

    Joined:
    Sep 27, 2021
    Messages:
    2
    Location:
    Ogdensburg, N.Y.
    I am new to this and not really much of a computer guy, but I bought a 40’ jlg lift a year or so ago. It’s a 1980 and now none of the functions are working at all. The local dealer only could tell me about this forum and couldn’t find what he needed for a wiring schematic. A lot of the wires and fuses are burnt up in the box behind the hr meter. Do I have scrap metal now or is there anything out there?
     
  4. OFF

    OFF Senior Member

    Joined:
    Sep 30, 2009
    Messages:
    922
    Occupation:
    HD Mechanic
    Location:
    Alberta, Canada
    Hello JWells. I can email you JLG 40F manuals and wiring diagrams as well as try and answer any questions you may have.

    I just need an email address to send the manuals to.

    Best way to do that is to click on my name, and in the little box that comes up, choose "start a conversation". That will send me a private message where you can put your email address without the whole world seeing it.
     
  5. OFF

    OFF Senior Member

    Joined:
    Sep 30, 2009
    Messages:
    922
    Occupation:
    HD Mechanic
    Location:
    Alberta, Canada
    On units made before 1980, the first two digits on the serial number seems to me to be the year. People have told me that's wrong, but I don't think so. I worked on a lot of JLG's made in the 70's and the age seemed to fit.
     
  6. Jwells

    Jwells New Member

    Joined:
    Sep 27, 2021
    Messages:
    2
    Location:
    Ogdensburg, N.Y.
    Ok thank you! Also is it possible to buy original parts for a machine this old, such as that hr meter box I mentioned? Or do I look for an old dinosaur burial ground to try and get those parts? The local dealer can’t seem to have any luck, and the bigger dealers towards the bigger cities don’t want to help because it’s over 20 yrs old.
     
  7. Missingsoldier

    Missingsoldier New Member

    Joined:
    Sep 2, 2020
    Messages:
    4
    Location:
    Arkansas
    I have a new problem with my 40f. My basket level cylinder was leaking so I rebuilt it and now it will not go in and out. I am getting fluid to it but it will only go out and not back in. Is there a specific way to install it to get the air out?
     
  8. OFF

    OFF Senior Member

    Joined:
    Sep 30, 2009
    Messages:
    922
    Occupation:
    HD Mechanic
    Location:
    Alberta, Canada
    Start by looking up the JLG part number of what you need in the parts manual. Google that part number, you might get lucky. Many places sell obsolete parts and "jobber" parts.
    Also give that part number to your JLG dealer so he can run it. Dealers can't look up a part that old, but they can still run the number in the JLG system. Those two methods are all you have to work with.

    That main control box is going to be a tough find. However, I did have a NOS 40F basket control box in my dead stock, (I gave it to the person who started this thread) so it's not impossible.
    Good luck
     
  9. OFF

    OFF Senior Member

    Joined:
    Sep 30, 2009
    Messages:
    922
    Occupation:
    HD Mechanic
    Location:
    Alberta, Canada
    Have a look in the service manual for a bleeding procedure for the basket leveling cylinder.
    Make sure your lock valve is installed correctly and your hoses are on right. Have you tried tilting the basket from the ground controls? If you get it to move, run it fully extended to fully retracted a couple times and all air should be gone.
     
  10. maple2

    maple2 Member

    Joined:
    Sep 10, 2014
    Messages:
    12
    Location:
    vermont
    Just popped hydraulic hose tonight on the basket up and down. Any tricks in changing this line? Anything to watch out for? Looks like a long hose!
     
  11. OFF

    OFF Senior Member

    Joined:
    Sep 30, 2009
    Messages:
    922
    Occupation:
    HD Mechanic
    Location:
    Alberta, Canada
    It is a long hose alright. What was the reason for the failure? Wear spot? How are the other hoses in the boom looking?

    not a nice job for sure. The method is to couple a new hose to one end of the old hose, and pull the new hose in while pulling the old hose out. Problem is that those hoses are often tangled and wrapped up around each other, and not as easy as it sounds.
    Somewhere in the archives I have hose lengths, I'll see what I can find.
     
  12. OFF

    OFF Senior Member

    Joined:
    Sep 30, 2009
    Messages:
    922
    Occupation:
    HD Mechanic
    Location:
    Alberta, Canada
    According to the JLG factory 40F build sheets.......you need 550 inches of 1/4" hydraulic hose (#4 hose) for the basket tilt function. The fittings are male 1/4" NPT.
     
  13. TheBigDog

    TheBigDog Member

    Joined:
    Jun 2, 2021
    Messages:
    11
    Location:
    Ohio
    @OFF , if you find the info on all the hose lengths, I could probably use them as I have several that are showing a lot of wear or are starting to crack.
     
  14. TheBigDog

    TheBigDog Member

    Joined:
    Jun 2, 2021
    Messages:
    11
    Location:
    Ohio
    So when driving the lift, the machine comes to an abrupt stop as soon as you return the joystick to center. Is this normal on this machine or should it be a more gentle deceleration? If it should be more gentle, what would I start looking for as the probable issue?
     
  15. OFF

    OFF Senior Member

    Joined:
    Sep 30, 2009
    Messages:
    922
    Occupation:
    HD Mechanic
    Location:
    Alberta, Canada
    On the "F" series JLG's there is no "ramp" feature to the controllers. If you're driving and you take your foot of the foot switch or let go of the controller, the brakes are on and the wheels are locked up at that moment. Sudden, abrupt, a little rude.

    The feathering or the ramp feature on controllers did start being used until the "H" series.
     
  16. OFF

    OFF Senior Member

    Joined:
    Sep 30, 2009
    Messages:
    922
    Occupation:
    HD Mechanic
    Location:
    Alberta, Canada
    You want lengths for all 4 boom hoses? It won't be today, but I'll get them listed in here. There are only 4 hoses in the boom, right? Basket tilt and basket swivel?
     
  17. TheBigDog

    TheBigDog Member

    Joined:
    Jun 2, 2021
    Messages:
    11
    Location:
    Ohio
    Yes, there are 4 hoses. I know that two are for basket tilt and figured the other two were for the telescope function.
     
    Last edited: Dec 8, 2021
  18. TheBigDog

    TheBigDog Member

    Joined:
    Jun 2, 2021
    Messages:
    11
    Location:
    Ohio
    Ok, I had someone check it out and they thought maybe there was an accumulator or something that might be bad and causing the brakes to suddenly lock vs a ramp down / smooth deceleration.
     
  19. Michael Huckenpoehler

    Michael Huckenpoehler New Member

    Joined:
    Apr 14, 2021
    Messages:
    4
    Location:
    Georgetown CA
    I am wanting to fix the leaking drive motors. Does any one have a part number for the seals? Went to one hydraulic shop and they couldn't/wouldn't help me. Trying another shop but if anyone has those numbers that would be a huge help. Thanks
     
  20. OFF

    OFF Senior Member

    Joined:
    Sep 30, 2009
    Messages:
    922
    Occupation:
    HD Mechanic
    Location:
    Alberta, Canada
    Seal kit for drive motors:

    JLG PART # 7000311 - SEAL KIT,