When I first got my CK30 I couldn't get it in 4wd. Got under and did the WD40 thing, it all most worked but what I finaily did was take the apart on the trans side, clean off the excess paint from all contact points, grease the "stud" etc. put it all together and now it goes into 4wd with ease, of coarse, I still raise the front end of the tractor to disengage it which is alot easier then trying to force it out.