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The JLG 40F Boom Lift Dilemma

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

  1. dbris

    dbris Active Member

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    Well, the lumps match and it has the coil (hidden in 35 years of muck) :eek: It seems to be wired to be on all the time so I need to do a little more research. Other than intermittent left steering, my one remaining problem is why there are 2 solenoids on the hi drive valve. I really appreciate the help that I'm getting from this forum, especially from OFF and ATCO you guys are great!
     
  2. willie59

    willie59 Super Moderator

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    Been years since I've looked at one of those things, but that high drive solenoid is a mystery to me. Not sure why it has two solenoid coils, it doesn't show two on the schematic. But looking at the pic, it looks like an inlet section with a solenoid valve, and a relief section with another solenoid valve. Don't know why they would rig it up like that, but I'd bet they both power up when you select hi-drive. Are you familiar with a valve rigged like that OFF?
     
  3. OFF

    OFF Senior Member

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    :beatsme

    One possible answer is the "two Speed" drive motor option. And I guess the way to tell would be to pull a cover off a drive motor and see what's there is for hoses.
    NOT counting the hose to the brake, with a normal single speed drive motor you should see 2 large hoses and 1 small hose (case drain). With the 2 speed motors you'll have 4 - 2 large hoses and 2 small hoses. Again, not counting the brake hose.

    I must admit however that I'm a little confused about whether we're talking solenoids or solenoid valves. :eek:
     
  4. willie59

    willie59 Super Moderator

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    I'm looking at the solenoid valve assy in the first pic of post #231. Thinking it's the hi drive solenoid valve, but it has 2 coils on it. I don't see anything like that on the electrical schematic. That's the valve I was asking if you've seen before.
     
  5. OFF

    OFF Senior Member

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    I've never seen that setup on a 40F either. I'm thinking it's a dump valve for the other bang-bangs and a high drive valve. Valves with an angled plug on them like that top one in the picture always contain a pressure relief cartridge and usually associated with a function that has a lock-out. There are no lockouts on a 40F.
    In post 225, the second picture shows a three section bang-bang valve bank with a dump. Three sections are not enough to run a 40F. Let's say they are Telescope, Steer, and basket rotate. Where's basket level? In the top picture of post 225 you can see the hoses leaving those 2 valves and heading
    behind the bulkhead the bang-bangs are bolted to. I think there could be another bang-bang back there......maybe.....which would explain the extra dump. :beatsme
     
  6. willie59

    willie59 Super Moderator

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    LoL, those machines are way back in the cobwebs of my head to remember what components they had on them. :tong

    I noticed that relief cartridge in the solenoid on top, very much like the dump valve section you typically see on the bang valve stack of the H models and such. Didn't they make some 40F's that had a manual basket rotate? And therefore wouldn't need a solenoid valve for that function? Can't remember for sure. :)
     
  7. dbris

    dbris Active Member

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    It's the single speed motor, 2 large hoses and 1 drain + brake, and I think we can safely say "solenoid valves".
     
  8. dbris

    dbris Active Member

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    Of the 3 hoses connected to the valve with the "angled" plug (hi drive), one is from the pump, one to the tank and one to the dump valve for the proportional stack. the 3 proportional valves are drive, lift and swing. The other 3 bang bangs are basket level, telescope and steer. One other note, I think that this machine is a little older than the schematic shows since it's missing some things like the ammeter, horn, clogged filter light and emergency stop.
     
  9. OFF

    OFF Senior Member

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    I've never seen a manual basket rotate, but you could be right. That would explain the missing valve.

    dbris - does your machine have basket rotate?
     
  10. dbris

    dbris Active Member

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    No, there is no basket rotate that I know of.
     
  11. mechanicalfreek

    mechanicalfreek Member

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    hello, i am new to this and i need wiring schematics for the jlg 40f also, did you get the wiring down,if so could you help me out of a bind, my lift ony goes up when you push the buttons on the controls,i was stuck in air a while,i got it runnen and couldn't waite to try it,took 20 min to get down,,same problem,someone played with wiring.thanks,,Adam..
     
  12. dbris

    dbris Active Member

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    Hi Adam, I'm certainly no expert but I'll send you the parts and service manual that OFF sent to me. There are some folks on this forum that have experience with the 40F and I'm sure that they'll be glad to help. Dave
     
  13. OFF

    OFF Senior Member

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    Welcome to the site :)

    Is it only the boom up/boom down function that's acting up? Does it work from the ground controls ok? When you get the book from dbris, look through and pick out what brand of controllers & valves you have and let us know. It really helps with nailing down a problem.
     
  14. mechanicalfreek

    mechanicalfreek Member

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    could you email all the wiring for the bertea valve and controls to the bang bang valves,,to adamberenty@yahoo.com thanks
     
  15. mechanicalfreek

    mechanicalfreek Member

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    i need diagrams of wiring please someone, for this jlg 40f lift,
     
  16. dbris

    dbris Active Member

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    Ok, you should have them now, good luck!

    Dave
     
  17. mechanicalfreek

    mechanicalfreek Member

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    can you help me find the jlg 40f lift wiring schematics? thank you...
     
  18. mechanicalfreek

    mechanicalfreek Member

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    thank you all for sending them,i got them,i'm still new to site and didn't check me mail,sorry,thanks again,,,,,,,,
     
  19. OFF

    OFF Senior Member

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    :confused:

    Both dbris & I sent you the 40F wiring schematics, and I sent you the service/parts manual set. You didn't get any of that stuff?
     
  20. ems automotive

    ems automotive Member

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    i finally registered after reading all 18 pages of this post, wow i learned more than i was asking for. i have a jlg 40f works pretty good, just finished building a new fuel tank that looks like the oem, the rust in the bottom the bottom of the tank was over a inch thick and this was after pouring a couple of gallons of hydrocloric acid to clean the tank. so we built a new tank.

    had the govenor on the wisconsin engine go bad and the engine free rev'd i wired the throttle in place so we could move it. simple part and a cheap fix also had a problem with water getting into the cylinders via open exhaust pipe, had the starter rebuilt used "southeastern starter and alt in baxley ga. they do good work.

    everything works on this unit except the back up emergency/safety controls. all will work when the engine is running, on the ground and in the bucket, but when using the smaller electric back up pump they stop working except for the boom extend in/out. i can not even get the boom to come down when in th eair which should not require much hydraulic pressure from the small pump, the manuel hand valve for bleeding off pressure does work.

    ther are 2 wires that have been disconnected, but everything seems to work when the engine is running
    i am totally confused

    advise