Why is it difficult to shift gears in a manual transmission?

[McClara]

When a vehicle's transmission exhibits difficulty in gear shifting, common fault points include: 1. Possible wear of internal gears in the transmission. 2. Potential damage to the synchronizer inside the transmission. 3. Possible damage to the 1st gear within the shift lever assembly. 4. Possible malfunction in the manual transmission's shift mechanism. 5. Potential failure in the clutch system's three components, such as worn release bearing, clutch disc worn to its limit, or damaged pressure plate. Relevant information about the transmission is as follows: 1. Introduction: A device that changes speed ratio and direction of motion, used to alter torque, speed, and direction transmitted from the driving shaft to the driven shaft under different working conditions. A gear-driven transmission typically consists of a housing and several gear pairs. 2. Function: During vehicle operation, to adapt to various working conditions, the driving force and speed need to vary within a certain range. Since the existing engine's torque and speed variation range cannot meet this requirement, a transmission is installed.