How to Repair Gear Slippage in a Tiller?

[Richardson]

Gears only partially engage in width, the locking steel ball does not snap into the locking groove of the shift rail, or the shift lever end is severely worn. When the axial force on the gear exceeds the locking force generated by the locking spring, the sliding gear is pushed away, resulting in automatic gear disengagement. If the shift fork is deformed or severely worn, and the centerline of the sliding gear intersects at an angle with the shaft centerline, the sliding gear may move axially and disengage. Severe wear of the steel ball or positioning groove can also make it difficult to position the sliding gear during transmission, leading to gear disengagement. Bearing wear increases the clearance, causing a skewed thrust during gear engagement, which results in gear disengagement.