[winston]

Loaders have a relief valve that should relieve before killing the engine and although not positive I believe the actuator on the power steering should have a relief valve also. I would go on to say you should try to avoid going to the end of the actuator stroke and holding it there. Much like older cars might make the belt slip when doing that.

 

[winston]

Not meaning to say it can't happen, just don't think relief valve should be set high enough to kill engine if engine is at proper idle speed.

 

[winston]

May not be of help but here is a add on power steering unit manual by Yanmar for smaller units. I suspect yours is probably very similar. I believe your relief valve would be in the actuator. Under specifications it states relief valve factory set at 1200# + or - 100#. Might or might not be right for your unit.