Why Does the Gear Slip Out?

[Marley]

The reasons for gear slipping are: 1. The positioning pin of the gearshift lever is worn, loose, broken, or missing, causing it to lose control and swing arbitrarily; 2. The interlock device of the shift fork shaft is worn out and fails, and the ball head of the gearshift lever is excessively worn and loose; 3. The gears, gear rings, or gear sleeves are worn into a conical shape along the tooth length direction, causing them to disengage under the axial force generated during operation; 4. The sliding grooves of the shift fork shaft, locking pins, and other components are excessively worn, the shift fork is bent or deformed, or the working surface and the gear ring groove are worn out; 5. The rear end fixing nut of the second shaft is loose, causing axial movement of the second shaft; 6. The locking pins of the synchronizer are loose or the conical working surface fails.