What are the causes and detection methods of transmission shift failure?

Cause of failure: It is caused by loose wear and damage of the relevant parts of the transmission, or improper adjustment of the matching clearance.

Detection method: Push the gear lever into this gear, then remove the transmission cover to check the gear mesh. If the gear mesh is good, the fault lies in the gear shift mechanism.

Push the shift fork of the jump gear by hand to test its positioning device. If the positioning is not good, the shift fork shaft needs to be removed and the set ball and spring should be inspected. If the gear is not completely engaged, push the gear or gear sleeve that has been shifted by hand to mesh correctly, and check whether the shift fork is bent or sharp, whether the shift fork fixing screw is loose, and whether the gap between the fork end and the gear groove is too large.

If the gear shift is good and the gear or gear sleeve can be fully meshed, check whether the gear is ground into a tapered shape, whether the bearing is loose, and whether the transmission shaft moves back and forth.

The main reasons for the failure of the transmission shift are as follows: The groove of the transmission fork shaft is loose due to the wear of the set ball, and the positioning spring becomes soft or broken; The gears are not properly engaged due to bent shifters, excessive wear or loose set screws; The gear or gear sleeve is worn too much, and it is ground into a conical shape along the direction of the tooth length; The variable speed shaft and bearing are seriously worn or the axial clearance is too large, and the gear moves up and down or moves when it is transmitted; The non-parallelism of the main shaft and the countershaft of the transmission exceeds the specified standard; Loosening of the front fixing nut of the transmission countershaft; Spline teeth for spindles and splined grooves for sliding gears.

There are two common scenarios for transmission shifts. One is to lift the accelerator pedal slightly while driving, and the gear will jump back to the neutral position; The other is that when the uphill load increases, the gear immediately jumps back to the neutral position, in this case, if the re-hanging gear is not hooked, it is easy to form a slippery slope and a serious accident occurs.

The reasons for this are as follows:

1) The elastic force of the fork spring is weakened or broken, so that the self-locking position fails; Hu Mao.

2) The fork locking screw is loose, the fork shaft positioning groove or the steel ball of the self-locking device is worn, and the gear lever cannot be reliably positioned;

3) The effective stroke of the fork is small or the fork is bent and deformed, resulting in the gear meshing is not in place, and it is easy to get out of gear after being stressed;

4) The end face of the fork is seriously worn, the gap between the end face of the fork and the sliding gear ring groove is too large, and the sliding gear is easy to shift forward and backward and automatically disarm;

5) The gear working surface is worn into a conical shape, so that the gear meshing gap is too large, and the axial thrust is easy to be generated, resulting in the sliding gear disengaging and meshing;

6) The spline between the gear and the shaft is worn, and the keyway clearance is too large, so that the gear swings in the transmission, and the sliding gear is easy to get out of the meshing position.

1) The phenomenon of transmission tripping and stopping: when the car is moving, the gear lever automatically jumps back to the neutral position (generally occurs when the load is abrupt at medium and high speeds or the car vibrates violently). (2) The reason for the transmission tripping and shutdown is that the transmission gear or gear sleeve is excessively worn and ground into a conical shape along the direction of the tooth length. The grooves and positioning balls of the fork shaft are worn, and the positioning spring is too soft or broken, resulting in the failure of the self-locking device.

The shaft and bearing of the transmission are worn loose or the axial clearance is too large, so that the gear mesh is not sufficient when the shaft rotates, resulting in runout and shaft noise and block movement. The deformation and loosening of the manipulation erection mechanism lead to insufficient gear meshing at the position of the tooth length. (3) Fault diagnosis of transmission tripping and shutdownWhen a certain gear is found to be tripping and stopping, still hang the gear lever in that gear, and then remove the transmission cover to check the gear meshing.

If the gears mesh well, check the shift mechanism. Push the gear lever with your hands. If there is no resistance or the resistance is small, the self-locking device is ineffective.

Check whether the grooves on the self-locking steel ball and fork shaft are too worn, and whether the self-locking steel ball spring is too soft or broken. If there is, it should be replaced. If the gears are not fully engaged, check the fork for wear or deformation, and correct if bent.

If the shift mechanism is in good condition, check whether the gear is ground into a cone and whether the bearing is loose, and remove it for repair or replacement if necessary.

Fault phenomenon] transmission gear jumping refers to the automatic jump back to the neutral position of the gear lever in the car while driving, this phenomenon mostly occurs in medium and high speeds, when the load changes suddenly or the car is subjected to severe vibration, and most of them are in high-speed gear jumping. So, what is the reason for transmission jumping? And how to eliminate this kind of failure?

Troubleshooting] 1. Cause of failure: Excessive wear of variable speed gears, gear sleeves or synchronizer cone disc teeth, forming a rudimentary shape along the tooth length direction, and generating an axial thrust when meshing, and being affected by the inertia of vibration and speed change in the work, forcing the meshing gear to disengage along the axial direction.

Troubleshooting: When you find that the transmission is out of gear, you should change the gear lever to the gear, and then remove the transmission cover to see the gear meshing, if the meshing is good, check the transmission fork shaft locking mechanism.

2. Cause of failure: the transmission is not firmly fixed.

Troubleshooting: Check the transmission fixing bolts and tighten them if they are loose.

3. Cause of failure: the locking pin of the synchronizer is loose, the synchronizer is loose or the length of the joint tooth has been seriously worn.

Troubleshooting: Check the working condition of the synchronizer, if there is a fault, it should be repaired or replaced.

4. Cause of failure: variable speed bending deformation, excessive wear, loose fixing screws or deformation of the gear lever, etc., so that the gear can not mesh normally.

Troubleshooting: Check the meshing of the gears, if the gears are not fully engaged, push the gear or gear sleeve of the jump gear by hand to make them mesh correctly, and then check whether the gear fork is bent or worn excessively, and whether the gear fork fixing screw is loose, whether the fork end and the gear slot gap is too large, such as the gear fork bending should be corrected, the lower end of the shift fork is worn or the sliding gear groove is too loose should be removed for repair.

5. Cause of failure: excessive wear of the spline teeth of the shaft and the spline groove of the sliding gear.

Troubleshooting: Check the wear of the bearing and shaft, if the shaft is seriously worn, the bearing is loose or the variable speed shaft is moving along the axial direction, it should be removed for repair or replacement.

6. Cause of failure: the self-locking device is worn loosely, and the spring elasticity is insufficient or broken, resulting in insufficient locking force, so that the variable speed fork shaft can not be reliably positioned.

Troubleshooting: Push the gear fork to check the positioning device by hand, if the positioning is poor, remove the shift fork shaft to check the position ball and spring, if the spring is too soft or broken, it should be replaced, if the change fork shaft groove is worn excessively, it should be repaired or replaced.

<> "How to Eliminate & Vehicle Transmission Skip Faults.

Transmission skipping refers to the automatic jump back to the neutral position of the gear lever in the car while driving, which mostly occurs in medium and high-speed driving, when the load changes suddenly or the car is subjected to severe vibration, and most of them are in high-speed gear jumping. So, what is the reason for transmission jumping? And how to eliminate this kind of failure?

Causes of transmission skip failures:

l. Variable speed gears, gear sleeves or synchronizer cone disc teeth are excessively worn, forming a rudimentary shape along the tooth length direction, and an axial thrust is generated when meshing, and it is affected by the inertia of vibration and speed change in the work, forcing the meshing gear to disengage along the axial direction.

2. Variable speed bending deformation, excessive wear, loose fixing screws or deformation of the gear lever, etc., so that the gear can not mesh normally.

3. The self-locking device is worn and loose, and the spring elasticity is insufficient or broken, resulting in insufficient locking force, so that the variable speed fork shaft can not be reliably positioned.

4. The shaft and bearing are seriously worn, and the axial clearance is too large.

1. The two shafts are not parallel to the intermediate shaft, so that the gears can not mesh normally and swing up and down.

5. The spline teeth of the shaft and the spline groove of the sliding gear are worn excessively.

6. The spline of the second shaft is twisted and deformed or the key teeth are worn excessively, and the lock nut is loose, causing the shaft or gear to move back and forth.

7. The locking pin of the synchronizer is loose, and the synchronizer is falling apart or the length of the joint tooth has been seriously worn.

8. The transmission is not firmly fixed.

Blind judgment and elimination of transmission jump faults:

l. When the transmission is found to be jumping, the gear lever should be replaced by the gear, and then the transmission cover should be removed to see the gear meshing, if the meshing is good, check the transmission fork shaft locking mechanism.

2. Push the gear fork to check the positioning device by hand, if the positioning is poor, remove the gear fork shaft to check the positioning ball and spring, if the spring is too soft or broken, it should be replaced, and if the groove of the shift fork shaft is worn excessively, it should be repaired or replaced.

3. Check the meshing of the gears, if the gears are not completely meshed, push the gear or gear sleeve of the jump gear by hand to make them mesh correctly, and then check whether the gear fork is bent or worn excessively, and whether the gear fork fixing screw is loose, whether the gap between the fork end and the gear slot is too large, such as the bending of the gear fork should be corrected, and the lower end of the shift fork should be dismantled and repaired when the sliding gear groove is too loose.

4. If the transmission mechanism is good, and the gear or gear sleeve can be meshed correctly, the gear should be checked to see if it is worn into a tapered shape, and if the wear is serious, it should be replaced.

5. Check the wear and tear of the bearing and shaft, if the shaft is seriously worn, the bearing is loose or the variable speed shaft moves along the axial direction, it should be removed for repair or replacement.

6. Check the working condition of the synchronizer, and repair or replace it if there is a fault.

7. Check the transmission fixing bolts, if loose, tighten them.

Troubleshooting methods for transmission jump shutdown include: Replace the set ball spring. Replace the shift shaft. Replace the spline. Fork. Replace the connecting pins. Replace gears or bearings.

Transmission jumping fault phenomenon: When the car is moving, the gear lever automatically jumps back to the empty position. This phenomenon mostly occurs at medium and high speeds, and when the load changes suddenly or the car is subjected to severe vibration, it mostly jumps at high speed.

Judgment and elimination of transmission jumping faults

1.When you notice that the gear is jumping, shift the gear lever to this gear, and then remove the spike speed changer cover to check the gear mesh. If the meshing is good, check the locking mechanism of the transmission fork shaft;

2.Push the shift fork by hand to test the positioning device shift. If the positioning is poor, remove the fork shaft and check the set-piece and spring carefully. If the spring is too soft or broken, replace it. If the grooves of the transmission fork shaft are excessively worn, they should be repaired or replaced;

3.Check the meshing of the gears. If the gears are not fully engaged, the runout gears or gear sleeves can be properly meshed by pushing them by hand.

Check whether the shift fork is bent or worn too much, whether the set screw of the shift fork is loose, and whether the gap between the fork end and the gear groove is too large. If you guess that the cherry celery shift fork is bent, it should be corrected; If the lower end of the fork is worn and the sliding gear groove is too loose, it should be removed for repair;

4.If the transmission mechanism is in good condition, and the gear or gear sleeve can be meshed correctly, check whether the gear is worn into a conical shape, and the gear should be replaced if the wear is serious;

5.Check the bearings and shafts for wear. If the shaft is badly worn, the bearing is loose or the variable speed shaft moves in the axial direction, it should be removed for repair or replacement.

6.Check the working condition of the synchronizer, and repair or replace it if there is a fault;

7.Check the transmission retaining bolts and tighten them if they are loose.

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The main reasons for transmission tripping: 1. The gear gear, gear sleeve or synchronizer bevel disc teeth are excessively worn, forming a rudimentary shape along the tooth length direction, and an axial thrust is generated when meshing, and it is affected by the inertia of vibration and speed change in the work, forcing the meshing gear to disengage along the axial direction; Variable speed bending deformation, excessive wear, loose fixing screws or deformation of the gear lever, etc., so that the gears can not mesh normally; 2. The self-locking device is worn loosely, and the spring elasticity is insufficient or broken, resulting in insufficient locking force, so that the variable speed fork shaft can not be reliably positioned; Severe wear of shafts and bearings, excessive axial clearance, or first.

1. The two shafts are not parallel to the intermediate shaft, so that the gears can not mesh normally and swing up and down. 3. The spline teeth of the shaft and the spline groove of the sliding gear are worn excessively; The second shaft spline is twisted and deformed or the key teeth are worn excessively, and the lock nut is loose, causing the shaft or gear to move back and forth; 4. The locking pin of the synchronizer is loose, and the synchronizer is loose or the length of the joint tooth has been seriously worn; The transmission is not firmly fixed.