Novices open the eighth gear, and there will be a squeaky sound when the high speed gear area is add

Hello Faste gearbox is a double-shaft gearbox, generally speaking, there will be a sound when starting gear, use the clutch when increasing and decreasing gears, and step on the clutch to pick up the gear when reducing the gear, release the clutch pedal and add air oil, and then step on the clutch gear, which is a coherent action.

How to shift gears in a dynamic car.

According to the engine structure and driving experience, the engine speed should be kept at about 3000 rpm when driving in urban areas. In this way, it is possible to make the most of the driving mode with good power and economical fuel consumption.

The corresponding speed at 3000 rpm is as follows.

15 km/h in 1st gear - 2000 rpm.

30 km/h in 2nd gear.

60 km/h in 3rd gear.

80 km/h in 4th gear.

110 km/h in 5th gear.

According to the sound and feeling of the engine in the above gears and speeds, we can reasonably grasp the timing and shift gears in time.

Basic principles of adding and subtracting gears:

Gear speed and gear are appropriate: from the lowest gear speed to the highest gear speed is the adaptation range of this gear, as far as possible to avoid using the lowest or highest gear for a long time;

Gear shift (plus or minus gear): In principle, as long as the gear speed range is reached, you can change gears, and the trade-off of gears should consider the speed, power and economy;

Drag gear: lower than the lowest gear speed is generally called drag gear, drag gear will make the vehicle weak, front and back, serious will cause the engine to stall;

Upshift: When the speed reaches the speed of one higher gear, it should be implemented upshift, and the general high-speed car is the engine speed of 3500-4500 rpm when the gear is upgraded;

Downshifting: When the speed is close to the lowest speed of the gear, it should be downshifted, and the timing of high-speed vehicle backshift should be mastered in the range of the speed of this gear - medium to low, and the latest can not be lower than the minimum speed of this gear; The timing of downshifts should be selected according to the road surface and power demand;

The use of gears under different road conditions:

Speed up and shift: Before entering the normal driving speed, the speed of the vehicle should be increased as much as possible in this gear (the speed corresponding to the high engine speed), so that the vehicle has enough power after the gear; This is especially important when implementing uphill upshifts;

Maintain gear dynamics: When driving uphill and adjusting the speed on the general road surface, the gear speed should be maintained at medium speed (the engine is running at medium speed), so that the vehicle has enough momentum and speed adjustability when driving;

Normal driving: When driving normally, the speed does not need to be adjusted too much, and the gear speed is selected to be low to be conducive to driving economy;

Downhill gearing: general non-dangerous downhill, the gear can be appropriately hung high, the downhill resistance is small, the acceleration performance is good, the gear operation can be carried out in advance, and the high-grade can save fuel;

Downhill gearing: When going down a long slope, in order to avoid using the brake for a long time and causing brake efficiency reduction and failure, the corresponding low gear should be hung and the engine should be used to control the speed; The principle of gear matching is mastered by the degree that there is no need to use the brakes for a long time to slow down.

It's a problem with the gearbox's third-speed synchronizer.

The reason why there is an abnormal sound in the car gear:

1. The clutch is not clear.

2. The gear lever is loose (the connecting rubber sleeve is loose).

3. The internal failure of the gearbox (synchronizer failure) will cause abnormal sound of gear, and sometimes abnormal noise is normal, such as stepping on the clutch not to the end or the car does not stop and hanging the reverse gear.

When the car is in gear, it is necessary to judge where the abnormal noise is coming from from the sound when the car is in gear.

If the sound is low when the gear is in gear, it is the sound of the gear mechanism coming from near the gear lever.

If the gear is clicking, it is caused by a transmission gear shock failure.

The reasons for the noise in the gear are improper operation, clutch failure, sprocket wear, and chain looseness.

On the issue of abnormal noise of automobiles, it is difficult for ordinary car owners to distinguish which ones are abnormal noises and which ones are reasonable abnormal noises. Only nearly 20% of the vehicles that went to the repair shop to detect abnormal noises were really faulty. In the case of a turbocharged engine, there is a must be a difference between the sound and the sound of a naturally aspirated engine; Models with engine guards may also make noises due to friction; After some car owners come into contact with different cars, it is likely that they lack their own understanding of mechanical knowledge, so they can distinguish the abnormal noise of the car and avoid wasting time and energy.

Second, the identification method of car noise:

In practice, due to the limitations of working conditions, it is difficult to measure the sound of the car with special instruments, and the sound of the car can only be described and compared with the judgment of the sound in daily life. For example, the "rattle" sound caused by the dry friction of the bearing, and the "click" sound similar to the small hammer hitting the cement floor caused by the excessive valve clearance.

1. Correctly distinguish between normal and abnormal sounds.

The vibration of each mechanism in the work of the car will make a variety of sounds, but the sound does not mean that the car is faulty, in order to avoid unnecessary disassembly, we must first distinguish between normal sound and abnormal sound. The normal vibration sound of each cluster system component (such as the noise on the engine surface), the impact sound of the gear when shifting, the air intake sound and exhaust sound of using gas as the working source, and the gear meshing noise are all normal sounds. Abnormal noise (abnormal noise) can be divided into slight noise, general noise and malignant noise according to the impact on the performance of the car.

Slight noise, such as the flashover sound of high-voltage electric leakage, the slight loose sound of rolling bearings, etc., the general volume is small, the degree of loss of the grinding belt of the machine is not large, and there is no significant change for a long time, and this kind of fault can still maintain the normal driving of the car without repair.

3. When diagnosing abnormal noise, attention should be paid to creating good auscultation conditions and trying to eliminate the interference of other noises, so as not to affect the accuracy of judgment.

It is best to consciously amplify or reduce the sound, that is, use a screw or other metal rod as a stestological instrument to contact the sound part to amplify the sound, or use a single cylinder fire cut-off to reduce the sound to meet the diagnostic needs. The auscultation site should be kept quiet to minimize interference from human factors.

Maybe by taking it apart from the bottom of the gear knob and applying butter to the friction of the plastic parts will eliminate the squeak and squeak, and the gear changes will be smoother. The landlord can consult your moderator again.

Summary. Dear, I'm glad to answer for you the reason why there is an abnormal sound in the first gear, the second gear, and the third gear: 1. The clutch is not stepped on to the end; 2. The linkage mechanism is loose; 3. The clutch plate is seriously worn and the pressure plate is damaged; 4. The gear is not in place.

Dear, I'm glad to answer for you that the reason why there is an abnormal sound in the first and second gears and the third gear is that the studio beat 1 and the clutch is not stepped on to the end; 2. The linkage mechanism is loose; 3. The clutch plate is seriously worn and the pressure plate is damaged; 4. The gear is not in place.

Second, the solution to the sound of the car gear: 1. The clutch must be stepped on in place; 2. Check the mechanism of the jujube bucket and tighten it; 3. Replace the damaged clutch plate; 4. Master the correct method of hanging gear, and the hanging tassel grinding file must be in place.

The specific performance is 1The cause may be a faulty drivetrain, such as wear or crack damage to the driveshaft components, bearings or gears, resulting in abnormal noises. 2.

It may be a transmission problem, such as a worn transmission gear or a low buried fluid in the transmission bridge. 3.Vehicle chassis components can also be the cause of squeaky noises, such as broken suspension guards, loose shock absorbers, engine chassis brake problems, etc.

4.If there is a problem with the tires, it can also cause the vehicle to make abnormal noises, such as punctures, tire wear, etc. 5.

It may also be the sound of the wheels and wheels crushing, the noise of the wear of brake parts, etc., which may cause the vehicle to make abnormal noises. Either reason, it needs to be investigated and repaired in time, otherwise it may lead to vehicle driving safety problems, and even lead to vehicle failure in serious cases.

The reason for the abnormal sound when the manual transmission car shifts may be that the hand transmission car is a little long, whether the shift mechanism is loose, check whether the shift ball head and gear locking mechanism are loose and abnormal. When it's cold, there are times when the car makes a screeching noise after changing gears.

When shifting gears, the clutch should be stepped on to the end, which is a process of completely disengaging the engine from the transmission gear, changing the gear set through the gear lever, and then re-engaging. Due to the different gear sets before and after shifting, there is a speed difference between the gear sets to be engaged after shifting, which is synchronized by a synchronizer.

If the clutch is not stepped on the end and the gear is removed, there will be sliding friction between the engine and the gear shifter, and the abnormal sound you hear is the sound of slapping teeth, if the clutch is too shallow and even the gear set can not be disengaged, that is, it cannot be taken off the gear.

In the process of gearing, if the clutch is not stepped on, there will be a large speed difference between the shift gear set and the drive train gear set, and the meshing will not be smoothly engaged, and there will be a sound of toothing. If it is serious, it will knock out the teeth and cause damage to the gearbox.

First, the phenomenon of loud sounds. The sound of the transmission after the gear is geared is caused by the impact of the meshing gears and the resonance effect of the transmission housing cavity during operation. The stool argues.

2. Cause of sound (1) The transmission housing is damaged, and the transmission housing stove and bearing seat hole are worn and deformed for a long time.

The sound of this training is the largest when it is engaged in the low speed gear, and the sound decreases gradually as it is engaged in the high speed gear, and the direct gear is the smallest.

2) Impact during meshing due to the fragmentation of individual gear surfaces. When this gear is engaged, there is a strong shock and vibration that resonates with the transmission housing.

3) The transmission is not properly assembled, the gears or needle roller bearings and bushings of a certain gear of the transmission are not properly replaced, and the assembly clearance is abnormal, resulting in poor gear meshing and abnormal noise during transmission.

The reasons for this are as follows:1. Clutch problem: When shifting, if the clutch is adjusted improperly or worn too much, it will cause the muck truck to make abnormal noise. In this case, the clutch needs to be repaired or replaced.

2. Gear problem: If the gear of the muck truck is worn or damaged, it will also make a sound when the gear is added. This type of gear needs to be overhauled and its worn parts replaced.

3. Transmission problem: If the internal structure of the transmission of the muck truck fails, it will cause a sound when the gear is added. This situation requires a comprehensive inspection and maintenance of the transmission.

Summary. The reason for the gear wear in the gearbox is also due to the failure of the transmission system of the car.

The reason for the gear wear in the gearbox is also due to the failure of the transmission system of the car, and the smoothness of the car shift is largely affected by the clutch and synchronizer, but some models do not use the synchronizer in the first gear and reverse gear, which makes the rotation speed between the engine power output shaft and the output shaft of the gearbox power not synchronized when shifting, so there will be abnormal noise. In addition, the clutch is seriously worn and will also produce abnormal noise, the free stroke of the clutch pedal is too small and will also lead to abnormal noise, the clutch can not completely cut off the power connection between the engine and the gearbox in the process of working, and there will be a very large speed difference in the process of shifting, and there will be difficulty in meshing between the two gears, and the sound of gnashing teeth will appear in the gear shift. In the process of shifting gears, if the clutch pedal is not pressed all the way down, it will also cause a gnashing sound, mainly due to the speed of rotation of the engine PTO wheel gears out of sync.