The problem started with no lift for the loader. Replaced the control cable and loader control valve [AW27446]. Loader works okay, but no steering unless holing the loader control is in the raise position. Removed loader valve and installed the old valve. loader works great, but no steering. there is a small flat disk [R95493] that goes in the side of the valve near the spring and plunger. What is the function of that disk and is that disk needed for the three point valve, loader lift valve and bucket valve??? I can not figure what I am doing wrong. Your help is deeply appreciated. Tim