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    JLG wiring diagrams: meaning of solid black triangles

    I acquired a JLG 40H that previous owner seems to have done significant rewiring on, and have started puzzling through the schematics to try and make sense of it all. Possibly a dumb question, but what do the black triangles signify? The blurry text doesn't help with the interpretation, but my...
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    Ford LRG423 - Zenith Model 33 carb rebuild advice

    1997 JLG 40H with Ford LRG423 dual fuel. A lot of difficulty starting, spark ok, so suspecting a carburetion issue, I picked up a rebuild kit for the Zenith Model 33 carb. It turns out I don't understand the idle circuit on this carb. There is an idle port and screw at the base and two plugs...
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    JLG 40H no proportional controls

    Baby's first lift, a JLG 40H 1997 with Ford engine and 3 PQ Controls at the platform. s/n 047753030030541 All the ground controls and platform switch controls work as expected but none of the proportional controls does anything. PO says they worked intermittently and in certain positions before...
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    JLG 40H w Ford & Zenith carb: choke electric characteristics?

    Got a Zenith 15080, Ford part # F8JL-TA, with an electric choke. Removing the carb for cleaning, the choke terminal thumbscrew was seized and trying to force it loose I felt something snap inside the choke. Opening it I found fragments of a plastic stop for the terminal bolt head and two very...
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    JLG 40H 1997 platform controls troubleshooting: PWM or not?

    Hi, I just bought a 1997 JLG 40H that operates normally from ground controls, but the engine dies when switched to platform controls. It has spent a lot of time sitting outdoors in extreme weather so I am bracing myself for finding a variety of issues in the controls and boom wiring. The machine...
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