I have a jlg t350. Today while in the bucket, I pressed the "kill" button while I performed my work. When ready to move, I released the button but there was no power. No lights, no beeps, not a thing. I crawled down to the ground and place the selecter switch on the main panel to "main panel control" and still nothing.
I tried running the unit from the ground with the bucket control unit disconnected. I opened the battery quick disconnect and then cleaned all eight battery terminal connections. I checked batter voltage and have 27 volts. This happened earlier today and for no apparent reason, the unit started working again. This was before I cleaned the terminals.
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I am still waiting for an answer. Additional information: The second time the machine went "dead", I was unable to get it to turn on again. I let the unit sit overnight and went out this morning and turned the key on and the machine responded. I was able to return the boom and bucket to the "travel" position and raised the outriggers. I selected the boom contoller and it also responded. I cycled the outriggers two or three times during the day and each time the unit energized and operated. I am concerned about going up in the bucket again until I can understand what is causing this problem. Each time it happened, it was after pushing the mushroom button on the remote control panel, performing some tasks and then, when ready to move to another area, releasing the mushroom button resulted in "nothing". Like I said before, no beep, no warning light, no power or indication of any kind.
Hi it sounds as though the kill switch itself has a loose terminal on it if you take it out and look on the back there are rivets that hold the terminals on[see if one is loose] that would explain why after waiting [allowing it to cool ]contact is then remade I would replace kill switch the only other thing it could be is a sticking relay if it has one in that circuit but I don't think that lift has one
If it was the kill switch on the remote panel, wouldn't the unit work once the ground control panel was selected? Doesn't that selector switch by-pass all the boom panel controls?
it bypasses everything but the stop button with either button it will stay off safety reasonsspankyjr141052.8161552431
I don't think that is how the circuit works. I have operated the machine from the ground with the boom control stop switch in. Also, I disconnected the boom controller from the machine and still had no luck trying to run it from the ground panel. IF there is a problem in the boom panel, it must be causing some timer to activate that prevents operation for a period of time since removing that entire panel from the circuit does not immediately remedy the situation.
the ones I worked on both stop switches were wired so if either one was activated it would not function you removing panel from boom controls then you also disconnected the stop switch witch needs to be connected to work. I know there is not a timer it is possible that a relay is sticking
do you know how many wires are on the back off either stop switch?
I agree that both switches have to be unlocked for the boom unit to work. I can unplug the boom unit and use the ground controller, this is necessary when the bucket is replaced with a lifting hook to lift equipment/parts/etc. The selector switch on the ground unit selects ground panel or boom panel so it is designed to operate in that manner. That is why I disconnected the boom panel when things went dead to see if I could isolate the problem to that panel. Obviously, that didn't work.
This all started after having the unit on the charger overnight. Is there any possibility of an over voltage relay kicking in? The voltage I measured at the batteries was 27.1V.
There are two wires on the back of the switch in the boom control panel. The switch on the main panel, I am not sure. It is a Push/Pull switch while the one on the boom panel is a Push/Twist to Release type.
ok if it is only a two wire then they are not wired together on your unit. so you bypassing should have worked. there is a low voltage cut out were you can't operate under a certain voltage and for high voltage but 27.1v is good
after you cleaning and charging your batteries have you had any problems because when unit is getting incorrect voltage it will do all kinds of weird things I think you mite have fixed already by cleaning all battery connections and charging bats
After I cleaned the eight battery terminal contacts, there was still no power to the unit controller(s). After the unit sat overnight, I checked and everything was working again. I used the ground control panel to "home" the boom and raise the outriggers in preparation for a possible delivery to a repair shop somewhere. When I selected the boom panel, that too powered up and ready to go. As I was leery of getting back into the bucket again without knowing what was going on and potentially having to crawl out again, I chose to periodically turn the unit on and cycle the outriggers. Three or four times I did this but still have not gone "up" again. I hit the ground pretty hard the last time. (Not a agile as I thought I was!) Once again, there is some reason why a period of time had to pass before things reset, even after having the batteries disconnected while cleaning the terminals. I guess the only thing I can do now is figure out how to lower the boom with had pump unit and show my wife how to do that and then give it another try?
It sounds as if you had a overload on the circuit if that was the case it would shut down power to unit it is a breaker this breaker is like a timer were after conditions correct then it will turn back on it works off of heat not time but they are related after time it cools off and resets so it's kind of a timer don't forget you charged batteries low voltage causes high amps witch would cause the over load That being said when is the last time you checked individual battery voltage you can have a bad battery also there should be a emergency lowering valve on unit for this problem its on the bottom unit by ram were hoses attach
I worked on all types of equipment semis,forklifts,farm,ect.
The breaker reset makes sense. This problem didn't start until after I charged the batteries. I used the unit the day before with no problems. As battery level was down to 1 green bar, I charged the batteries overnight. It was after that this problem began so if there was a high current, it wasn't due to low voltage, at least not from battery voltage.
I appreciate your time with this. If nothing else, maybe we eliminated some causes. If you happen to think of something else later on, you have my email.
Thanks for your help.
I will click this for reply and then will hit the accept answer.
Rite now every thing is working so hard to diagnose I would check bats one at a time as one bad one can cause problems. next find lowering valve so it can be lowerd in emergency. and don't put yourself in a situation that could cause you to get hurt and keep a eye on things for a while so if it happens again we will have more info to work with
Will do. I printed out the manual from JLG website so have the emergency operating procedures in a binder. I know this isn't "technical procedure" but Keep you fingers crossed! LOL Have a good day.
you to thanks spanky