What are the reasons for the inability to shift into third gear in the transmission?
1 Answers
The reasons for the inability to shift into third gear in the transmission are as follows: Whether the half-shaft is broken: If the car does not move when a gear is engaged, it is a functional comprehensive fault involving the clutch, transmission, and drive axle. During diagnosis, the fault location should be determined first, and the condition of both wheels can be checked initially. The diagnostic sequence generally starts from the drive wheels, moving forward through the rear axle to the drive shaft, then to the transmission, and finally to the clutch. If the drive shaft rotates but the car does not move forward, the fault lies in the rear axle. Lift the rear axle and rotate one rear wheel. If the other rear wheel rotates in the opposite direction but the drive shaft does not follow, it indicates that all rivets of the differential bevel gear are sheared. If the other rear wheel does not rotate, the half-shaft should be disassembled and inspected for breakage. Engaging a gear to start, but the drive shaft does not rotate: If the car is started in a certain gear but the drive shaft does not rotate, the fault lies in the transmission. Remove the transmission cover and inspect whether the transmission shift fork is broken or if the guide block fixing screws are loose. If the above checks are normal, proceed with a gear engagement test. If the second shaft does not rotate in a certain gear, it means the half-round key of that gear is sheared. If the second shaft rotates in direct drive but does not rotate in other gears, it indicates that the support bearings at both ends of the intermediate shaft have collapsed, causing the intermediate shaft to drop. The drive shaft does not rotate in any gear of the transmission: If the drive shaft does not rotate in any gear of the transmission, the fault lies in the clutch. Check whether the clutch is severely slipping, whether all the spline teeth of the driven plate hub are sheared or the steel plate is broken.
