Hi we have a Komatsu D41E-6 dozer , .The blade control lever feels like it hits something when push forward for lowering blade. like the Float function is straight off the hold position its a real clunk. i have attached a video, any ideas on what it could be? I disconnected linkage at the valve body and lever action was smooth so problem is in the body. have also attached a pic of parts assembly of valve body, assuming something is broken in here, going off that diagram if top cap is unbolted will the assembly pull out complete? just a bit worried of bits falling everywhere