Hi , my 2005 Jinma 504 shifter wont go on first gear and second gear , something seems stuck into the gearbox or shifter , first I thought its due to extreme cold wheather here in Quebec Canada but after running on other gears for an hour for snow blowing , it’s always the same .
I would assume you will have to open up the trans for that, when you say other gears you are meaning 3 and4 not forward and reverse thru a shuttle shift.
no shuttle shift option , but the forward reverse hi low shifter works good , transmission works on third gear ( too fast for snowblowing )
, when I try to get firs and second gear tractor stops after clutch released , I will remove the top of transmission this week end to see what is wrong with it