2003 New Holland TC30 tractor will not go into 4wd. Lever pops out of 4wd as soon as you start to move. Banging noise heard when forcing the lever to stay engaged.
Unhook the linkage and be sure it is getting full travel when it is put in gear. If it is going in all the way, the problem is going to be internal to the transmission. Lets hope its the linkage and can be adjusted. Thanks