Greetings .. I have a problem in a cat 416b only has strength to one side in the back .... strength left ... right without force .. bank valves damaged?
It could be packings in that piston allowing the fluid to blow by my neighbor had issues like that and replaced the whole controll bank then found out he had the same problem and it was the packing in the piston hope this helps
Search resolver network, it is small o rings in control valve.
thx. The problem was it was clogged and a small ring on the bench:notworthy