I have a 1999 JLG 1932 scissor lift model E serial 0200051309 that steers way too quick when you drive it. It steers reasonably slow when you are not driving and just press the left or right steer button in the static mode. However, when you are driving and then also press the steer button at the same time, the steering whips left or right at a very high speed. It steers proportional to the speed you are driving. Thus, if you are moving forward at full speed and then try to steer right or left, the steering turns at an amazingly fast speed. It only turns slower if you are driving slower and the turning angular speed seems proportional to the linear drive speed. Thus, driving it a full speed becomes impossible. My guys don't like using it and refer to this lift as "crazy horse". Not sure of what is wrong.
Here is what I did so far:
1) I put on the JLG analyzer read out to see the "personality" settings of this lift. There are factory settings recommended for the series E2 and series E3 lifts, but not for the series E lift, which this one is. The analyzer was really made for the newer lifts I think. The E series manual does not even give "personality" settings like the E2 or E3 manuals do.
2) I found that the steer drive comp setting on this lift was set to 29% whereas factory setting specifies 15% on the E2. I then reprogrammed to 15% and tried the lift again. No difference.
3) I then reprogrammed the steer drive comp all the way down to 1% and tried. Still no difference. I think that the E series must not be programmable for this feature as it did not change the performance.
4) I tried reprogramming any of the other settings that I could to override the max drive speed, etc and was able to slow the max drive speed down to 50% and thus the wild steering to 50%, but this is still too quick and now the lift drives only at half speed.
5) The service manual shows nothing about this and the wiring diagram just shows a "black box" multiplexer for this control system.
I only have one of these E series lifts so I do not know if maybe all of such E series had this problem or is there something wrong with my particular lift? I can't believe that this is the way they would have sold them as it is just plain dangerous to use. If you have the lift elevated and drive and try to turn, the sudden turning feels like the lift might tip over.
Any suggestions as to what to do here? As I said , in the static turning (turning when not moving), it turns fine. Factory set at 30%. I can in fact reprogram this static turn rate down even slower and it does indeed take the setting. Just doesn't take the reprogramming setting for the steering when driving parameter and I would have to say this seems to be set at 100% based on its performance.
I have no good solutions other than scrap the thing. It is in good shape other than this steering issue. I bought it at an auction a few years ago and did not know it had the "crazy" steering problem.
Other options I have is to make a separate control system using an arduino computer that I would interface with the control valve to the steering. If the unit was driving, I would have an A/D converter on the signal to the drive solenoid valve and then use it to control the signal to the steer valve. I think I could do this, but it would take some work and I would have the problem of powering the 5V arduino and protecting it from shock and dirt. Maybe I could also just make a simple logic circuit to effectively cut the steering voltage down when it was driving but then it would turn too slow when you were going at a creep speed. No easy solution here. Maybe I could put a flow restrictor in the line and then set the static turning setting higher to compensate for steering when not driving? Just throwing out possible routes.
I did call JLG service but got no answer being that I am not a JLG service dealer. I called two of the listed local JLG service dealers but they were going to do the same thing (run the JLG analyzer and reprogram the personality). No one really knew about the wild steering as the lift is pretty old.
There must be some answer to this other than having to basically redesign a new piggy back control system here. Any feedback from anyone else who has an E series JLG scissor lift?
Here is what I did so far:
1) I put on the JLG analyzer read out to see the "personality" settings of this lift. There are factory settings recommended for the series E2 and series E3 lifts, but not for the series E lift, which this one is. The analyzer was really made for the newer lifts I think. The E series manual does not even give "personality" settings like the E2 or E3 manuals do.
2) I found that the steer drive comp setting on this lift was set to 29% whereas factory setting specifies 15% on the E2. I then reprogrammed to 15% and tried the lift again. No difference.
3) I then reprogrammed the steer drive comp all the way down to 1% and tried. Still no difference. I think that the E series must not be programmable for this feature as it did not change the performance.
4) I tried reprogramming any of the other settings that I could to override the max drive speed, etc and was able to slow the max drive speed down to 50% and thus the wild steering to 50%, but this is still too quick and now the lift drives only at half speed.
5) The service manual shows nothing about this and the wiring diagram just shows a "black box" multiplexer for this control system.
I only have one of these E series lifts so I do not know if maybe all of such E series had this problem or is there something wrong with my particular lift? I can't believe that this is the way they would have sold them as it is just plain dangerous to use. If you have the lift elevated and drive and try to turn, the sudden turning feels like the lift might tip over.
Any suggestions as to what to do here? As I said , in the static turning (turning when not moving), it turns fine. Factory set at 30%. I can in fact reprogram this static turn rate down even slower and it does indeed take the setting. Just doesn't take the reprogramming setting for the steering when driving parameter and I would have to say this seems to be set at 100% based on its performance.
I have no good solutions other than scrap the thing. It is in good shape other than this steering issue. I bought it at an auction a few years ago and did not know it had the "crazy" steering problem.
Other options I have is to make a separate control system using an arduino computer that I would interface with the control valve to the steering. If the unit was driving, I would have an A/D converter on the signal to the drive solenoid valve and then use it to control the signal to the steer valve. I think I could do this, but it would take some work and I would have the problem of powering the 5V arduino and protecting it from shock and dirt. Maybe I could also just make a simple logic circuit to effectively cut the steering voltage down when it was driving but then it would turn too slow when you were going at a creep speed. No easy solution here. Maybe I could put a flow restrictor in the line and then set the static turning setting higher to compensate for steering when not driving? Just throwing out possible routes.
I did call JLG service but got no answer being that I am not a JLG service dealer. I called two of the listed local JLG service dealers but they were going to do the same thing (run the JLG analyzer and reprogram the personality). No one really knew about the wild steering as the lift is pretty old.
There must be some answer to this other than having to basically redesign a new piggy back control system here. Any feedback from anyone else who has an E series JLG scissor lift?
JLG 1932E steers way too quick
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