Hello everyone. This is my first post and I hope not to be ot here. I have a problem with the TC 241C. When I insert the 4 drive wheels, the truck moves 1 meter and then locks. Reverse gear is also locked. I have to remove the 4 drive wheels, turn off the engine and the system unlocks. When the truck stop, I don't accelerate because I'm afraid of causing damage. Perhaps it is useful to know that, a couple of months ago, I had to open the front differential to change a worn washer (I had lost oil from the differential). I repaired and everything worked properly. The TC outside is covered with mud and oil and I think it has lost all the oil. Can lack of oil cause a blockage? Perhaps the internal forks are worn out? I remember forks have some plastic insert. Tomorrow I will check oil level and, eventually, refill oil. Someone had same problem? Thanks in advance to everyone answer!