What are the reasons for fifth gear disengagement?

1 Answers
Jessie
07/30/25 4:04am
The reasons for fifth gear disengagement are as follows: 1. Self-locking device damage: To prevent gear disengagement during driving, the transmission control mechanism is usually equipped with a self-locking device. If this device is damaged (e.g., broken self-locking spring, fractured self-locking ball head, etc.), it may cause transmission disengagement. 2. Severe synchronizer wear: When the synchronizer engagement sleeve lock ring or slider is severely worn, the synchronizer may overcome the locking force of the self-locking device during high-speed rotation, sliding out of the engagement gear ring and causing transmission disengagement. 3. Severe wear of the shift lever or fork: If the shift lever or fork is severely worn, the fork may fail to push the synchronizer to the engagement position, preventing perfect meshing with the engagement sleeve. During high-speed rotation, the synchronizer may then slide out of the engagement sleeve, leading to transmission disengagement.
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