Hi, this is my first post on here. I have various IH tractors in differing stages of disrepair, including the above 4230 which will no longer come out of 4wd. I don't have a workshop manual for this tractor, so was wondering if anyone could give me any pointers on fixing it. So far, I've established that the solenoid is receiving power, and has a resistance of about 10.5 ohms - so I assume that is ok. Thanks for any replies.