yes richard, this is true, the sensors only interact to tell the position of the steering wheel. I realized after i made that post something else may be causing the issue. I remember once i dealt with a unit that had gone past it's stop point because the stop had broken and it wound up the hydraulic hoses around the steer unit and broke some fittings so it appeared to be turning around too far and was uncontrollable until i repaired the hoses, the stop and the sensors that had gotten damaged. Once i got that sorted out it did operate ok then.
Thanks for that reminder though :o)

Yes always should check the proxy sensors to ensure they are working and have correct spacing etc. But note that the proxy's are only used when the truck is transitioning from frontal mode to side modes and vise vera. Once this transition is completed they are not in use (Except the carousel ones, but that is a seperate conversation) They have no impact on the steering wheel itself.

Look forward to hearing what the fix was.
Again if you need technical support
Link is https://warranty.combilift.net/technical-support-form/
Combilift Technical Support is free to use.

as mr irwin suggests those components are a possibility but i would only check those as a last resort because the orbital valve does not commonly give problems. But as BLey suggested the wheel sensors can also cause the wheels to act up if they are not adjusted correctly or are bad and not working. And i wouldn't trust the indicator light on them either, i have had the light work and the sensor still not work properly so doing a physical check with an ohm meter on the circuit would be the best course of action imo.
I've dealt with this before myself and would be my first action to check.
If these position sensors are not adjusted correctly or are bad they can cause the wheels to not lock in and can make them cycle incorrectly when changing steering modes on their own seemingly. When you change steering modes also make sure they are turning completely from lock to lock, a bad steering mode cylinder can allow the wheel(s) to drift out of position coming off the sensor and keep them from operating properly.

It also depends if this is happening during a mode change (from fwd mode to side mode or reverse) as the steer system gets fed pressure from the manual valve chest. Is this happening during normal operation in one mode? Or when trying to switch modes?

If its happening during mode change and there is a high pitch squealing (steer system going into hydraulic pressure relief) I would inspect the steering prox sensors for proper operation first before anything else as this is the most common failure. (Clean, set air gaps and make sure they are lighting up when in front of metal) I also forgot to mention to check the wheel stop bolts for proper adjustment as this would prevent the wheel from stopping in the correct position physically.

Hi ,
CB6000 lbs. truck. You didn't mention CBE so we will assume it has an engine either GM/PSI or Toyota. 2 potential causes.
1. Posible dirt particles caught in the steering orbital. We would not typically recomed that this can be flushed out and due to safety reasons, we would recommend it is replaced.
2. Priority valve on the steering orbital is sticking. You could try to flush it to se if it will free itself, but most likley require replacement
Part no "CPS00020" is the steering orbital and priority bvalve in a single unit.
Alternatively you can submit a technical query via the combilift web site. Go to the bottom of the web site and select "Technical Support"
Link is https://warranty.combilift.net/technical-support-form/
Combilift Technical Support is free to use.

Thanks Richard