11-19-2018 07:33 PM - edited 11-19-2018 07:40 PM
the following indications are only if the rear wheels are working but goes out of alignment while driving
Rear steering hydraulic cylinder is most likely leaking or is bypassing internally.
Visually check for leaks (cylinder, hose, fittings, etc).
You can test your rear steer cylinder for internal leakage by turning the rear wheels all the way to the max on the left direction.
Once the wheels reached the max, stop the engine.
On the steer cylinder, disconnect and plug the left hose (return line).
Leave the cylinder fitting uncapped.
Have an assistant to firstly turn the steering wheel to the left, then secondly start the engine.
Since the wheels are already turned all the way to the left, there will be no oil coming out from the cylinder while the engine is running and you assistant keeps turning the steering wheel.
If there is a small but continous flow of oil coming out from the cylinder unplugged fitting, this means the steer cylinder is leaking internally and need to be repaired.
09-13-2013 03:10 PM
It could be a few different things. The steering postion sensors may need to be adjusted. There is a procedure how to adjust them properly in the service manual. The rear steering cylinder could be leaking internally or externally. The steering metering pump could have an internal or external leak. If none of these items are your problem, you may need to hook up CAT ET. I didn't completely research it, but the steering system might have a calibration sequence that may need to be completed. I'm not sure if this machine has that capability through CAT ET, but it may. That would be something your local CAT dealer would have to do unless you have CAT ET. Also, there may be a different electrical issue, like the steering selector relays not functioning properly, but it doesn't sound like it. Last but not least, a different hydraulic system issue. In that case, it would be time to break out the gages and start taking pressures. Start with the simplest and work your way down the list....GOOD LUCK.
09-07-2013 06:11 PM
Rear steering on this lift will drift or slowly turn while traveling . PS doesn't matter if the dash switch is enguaged for rear steering / crabbing it will do it either way. I have cleaned the rear solenoind valve assy that bolts to the steering sector. The problem went away for 1/2 hour then came right back. Purchased new solenoind valve assy for rear steering and still have same problem. Need further direction thanks S/E .