If i operate it say 15 times, it lifts about 2 inches, there is a point, about a quarter of the travel up where it lifts, i can’t hold it in that position, i only get it as it goes through that point. However now it is running at high revs, when i operate the Tower lift lever, i can feel it kick. It didn’t drive because i had the caps off the drives, now it is staying at high revs. Yesterday when things were working, i pushed forward the High engine, pump volume and wheel speed switches, nothing happened, then i operated the drive lever and the engine went to high revs This morning, i am back to where i was before, except that the engine is running at high revs. You have now got me thinking about voltage drop. Very important, if you have good 12 volt on the orange wire going to foot switch, when you step on the pedal, you should now have good 12 volt on the red wire going to terminal 37. Power splits off at circuit breaker, sends ignition power back to lower on blue wire terminal 33, and it sends power to the foot switch via orange wire. The power then goes through the E stop switch, then to the circuit breaker. If you get excessive voltage drop from bad wiring or bad connections, by the time you send a voltage signal back down the boom it's dropped off so much it's insufficient to power up solenoid valves.Īssuming it's still wired up using the original JLG colors, the main power should come to the platform on an 12 gauge orange wire at terminal 34. In your case, since all the functions work fine from the lower controls, but are problematic at the upper controls, the first thing you need to do is check voltage at the upper controls. Intermittent problems can be tough to troubleshoot. Good to hear you found the serial number, some times that's important for ordering parts. Just saying look the lower machine frame over real good for a stamped number.ĭrat, I forgot to ask, is this a Ford gas engine or a Deutz diesel? I can't recall for sure where they stamped it on the 45HA, and sometimes after a machine has had a few freshen up paint jobs it hides this stamped number. I take it swing, boom lift, tower lift, and drive are all proportional controls? If yes, are these controlled by PQ controllers?īTW, again, I can't verify on an Aussie version, but on JLG machines of that vintage, as far as the N America machines are concerned, JLG stamped the s/n in the lower frame. Swing, boom lift, tower lift, and drive does not work from upper controls, boom telescope and steer does work from upper controls. Aside from that, sounds like you've go some testing to do. As for serial number, the North American JLG boom lifts start with 03000, then the s/n, like 0300021445, maybe they do it different for the machine down under. I don't know what's up with the differences you see in your diagrams compared to the machine you have, perhaps something to do with an Australian version? I don't know if there's a difference with a North America and an Aussie version myself.
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