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  1. J

    The JLG 40F Boom Lift Dilemma

    I think I am making headway... New Gaped Plugs, Adjusted valve lash, replaced Carburetor, messed with throttle, and governor adjustments. Checked mechanical advance, to be sure it wasn't frozen, very little change... tweeked the timing counter clockwise, made it a little worse, tweeked the...
  2. J

    The JLG 40F Boom Lift Dilemma

    Will do, thank you :-)
  3. J

    1981 JLG 40G

    Hello, Im looking for the same, were you able to find anything?
  4. J

    Jlg 40g

    I am also looking for a wiring diagram for a 40G, were you able to find one?
  5. J

    The JLG 40F Boom Lift Dilemma

    Flushed the oil twice, then filled with 30W rotilla, this made a big difference, but now I cant engage drive to test it......... Pulled the entire control panel apart, sand blasted and painted the housing, nex ti will clean or remake every connection so I will know they are good. Also testing...
  6. J

    The JLG 40F Boom Lift Dilemma

    Will do, Thank you! I hope to have an update after the weekend
  7. J

    The JLG 40F Boom Lift Dilemma

    Hi Folks, I have just purchased a JLG 40G (date looks like 82) that has been sitting outside for a long time (about 7yrs) without the engine cover on, in the Vermont weather. The engine runs good until it is under load, then slows to about idle or less, moving it was a challenge :) I noticed...
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