Hello all. First post. I have a Massey 231 and the PTO lever broke. After I took off the side cover, I see that the ground speed pto gear is just floating on the shaft. I’m not understanding how it stays put. I can put it back in place but it is a loose fit. The engine pto at the bottom moves freely on the splines. Does the upper pto gear need a retainer? I felt around in the oil and don’t find anything. Thanks!