（1） Poor driving habits

Improper gear shifting operation: If the driver is eager to shift gears without fully pressing the clutch pedal, or if the shifting process is too rough and rapid, it will cause the synchronizer to bear huge impact force. Shifting gears without fully stepping on the clutch, the power between the input and output shafts of the transmission is not completely cut off. At this time, the synchronizer needs to forcefully coordinate gears of different speeds, which greatly increases the wear of the synchronizer. Over time, this can easily lead to synchronizer damage.

Frequent gear shifting: Performing unnecessary gear shifting operations frequently can significantly increase the operating frequency of the synchronizer, thereby accelerating its wear and tear. In congested urban road conditions, some drivers frequently switch between low-speed gears, which keeps the synchronizer almost always in working condition without sufficient rest. The internal friction elements and mechanical structures will gradually be damaged due to excessive friction and fatigue.

（2） Transmission oil issue

Poor oil quality: Transmission oil is like the "blood" of the gearbox, playing a crucial role in the normal operation of the synchronizer. If the quality of the transmission oil used does not meet the requirements, or if the oil deteriorates or contaminates due to long-term use, its lubrication and heat dissipation performance will be greatly reduced. Poor quality transmission oil cannot form a good lubricating film between the various components of the synchronizer, leading to increased friction between the components and accelerating wear. Impurities in the oil may also block the oil circuit of the synchronizer, affecting its normal operation.

Low oil level: Low transmission oil level can cause insufficient lubrication of some components of the synchronizer, leading to dry friction. Dry friction can cause a sharp increase in surface temperature of components, leading to increased wear, deformation, and even burning. In daily use, if the transmission oil level is not regularly checked, or if there is a transmission oil leak in the vehicle, it may cause the oil level to be too low and damage the synchronizer.

（3） Synchronizer quality defect

In the automotive parts market, there are some synchronizers with poor quality. These synchronizers may have quality defects during the manufacturing process due to improper material selection, substandard processing techniques, or insufficient assembly accuracy. Using synchronizers with quality issues makes them more prone to wear, damage, and other malfunctions during normal use. Some small manufacturers may choose low-quality metal materials for synchronizers in order to reduce costs. These materials have insufficient strength and wear resistance to withstand high loads during transmission operation, thereby shortening the service life of synchronizers.

（4） Excessive vehicle load

When the vehicle is driven under heavy load for a long time, the transmission needs to transmit greater torque, which significantly increases the pressure on the synchronizer. When starting with heavy loads or climbing hills, synchronizers need to overcome greater resistance to achieve synchronous meshing of gears, which undoubtedly increases the working intensity of synchronizers. Long term operation under such high load conditions will accelerate the wear rate of synchronizers and make them more prone to malfunctions. If you frequently drive a truck loaded with goods and the driving conditions are complex, such as frequent climbing and frequent starting and stopping, then the synchronizer of the vehicle faces a greater risk of damage.