Having some trouble with the powershift on the 2090. Specifically the engine is under load in the first range and will stall when it"s shifted to reverse. 2 and 3 seem to be fine. It sounds like one of the spools in the powershift control valve is sticking. We found the one that seems to be causing the problem, but there doesn"t appear to be anything wrong with the spool. So can someone please give me the proper procedure to clean these things out? What type of solvent do you clean these with, brake cleaner, carb cleaner, gas? We removed the spool with a 10-24 screw as recommended on this site. The spool itself looks clean and there isn"t any varnish on anything. But when you place the spool in the assembly it starts hanging up right away. Any help appreciated, thanks guys.