What s the reason for the vibration of the truck when it clicks in neutral?

Neutral usually refers to the state in which the gear lever of a motor vehicle is not put into any forward or reverse gear, and the transmission is completely separated from the drive wheels. The neutral DAO of the manual transmission is in the middle position, while the neutral of the automatic transmission is"n"Signs.

Neutral coasting has always been widely considered to be a more fuel-efficient operation, especially the vast majority of truck drivers, who often use the ignition off and neutral coasting to save fuel. However, for the current EFI engine car, the neutral coasting operation must be used cautiously, and the ignition and neutral coasting cannot be used.

The ultimate goal of coasting in neutral gear is nothing more than to save fuel, and of course it is certain that the engine is generally more fuel-efficient when running at idle than at medium and high speeds. However, the control system of most EFI engines has the function of deceleration or oil cut-off, for these EFI engines, it will no longer be necessary to use neutral coasting to carry out fuel-saving operations.

In fact, the main reason why we have always advocated that we should not coast in neutral gear is for driving safety. Once the gear lever is placed in neutral to coast, the drive wheels lose driving force, and at the same time, the power connection between the engine and the drive wheels is lost, and the car slides forward by its own inertia. Then, if there is an emergency and braking is required, all the braking force will only be provided by the brake, which requires the brake to provide a large braking force in a very short time, but the braking force provided by the braking system is also limited.

Therefore, this will inevitably affect the braking effect, or at least the braking distance will be extended.

Abnormal transmission noise refers to the abnormal sound emitted by the transmission when it is working.

Reason 1) The gear is too worn, the gear is too worn and thinned, the gap is too large, and there is an impact in operation; Poor tooth surface meshing, e.g. no replacement of gears in pairs during repairs. The new and old gears are matched, and the gears cannot be meshed correctly; The tooth surface has metal fatigue peeling or individual teeth are damaged and broken; The spline on the gear and the shaft is loosely mated, or the axial clearance of the gear is too large; The shaft is bent or the bearing is loose, which causes the gear meshing clearance to change, and the bearing rings are seriously worn; The inner (outer) bearing bearing is loosened with the journal (bore); The bearing balls are broken or have ablative pitting3 other reasons such as lack of oil in the transmission, lubricating oil is too thin, too thick or the quality is deteriorated; Foreign objects falling into the transmission; Some fastening bolts are loose; Fault diagnosis and elimination of odometer flexible shaft or odometer gear ringing The transmission emits a dry metal friction sound, which means that there is a lack of oil and the quality of the oil is not good. The quality of oil should be refueled and checked, and if necessary, it should be replaced When driving, if the sound is obvious, it is the gear tooth wear of the gear; If the periodic sound occurs, it is the sound of individual tooth damage when neutral, and the sound disappears after stepping on the clutch pedal, generally the front and rear bearings of a shaft or the sound of the gear meshing; If you change into any gear, most of the two-shaft rear bearing rings Sudden impact sound occurs when the transmission is working, mostly for the broken wheel teeth, the transmission cover should be removed in time to check, in case the parts are damaged When driving, the transmission only rings when changing into a certain gear, under the premise of the above-mentioned intact, the meshing gear should be checked whether it is not properly matched, and a pair of new gears should be reassembled if necessary.

In addition, it may also be that the synchronizer gear is worn or damaged, and should be repaired or replaced as the case may be, and the gear collides and rings when shifting, it may be that the clutch cannot be separated or the clutch pedal stroke is incorrect, the synchronizer is damaged, the idle speed is too large, the gear lever is improperly adjusted or the guide bushing is tight, etc. In this case, first check whether the clutch can be disengaged, and then adjust the idle or shift lever position respectively, and check the tightness of the fit between the guide bushing and the release bearing.

1. The reason may be that the car is a little long, the shift mechanism is loose, and the gear shift ball joint 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.

2. When shifting gears, the clutch should be stepped on to the end, which is the 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.

3. If the clutch is not stepped on to the end, there will be sliding friction between the engine and the shift gear group, and the abnormal sound you hear is the tooth beating4. During the gear entry process, if the clutch is not stepped on, the shift gear set and the drive train gear set will have a large speed difference, and the gear group will not be smoothly meshed, and there will be a sound of toothing. If it is serious, it will knock out the teeth and cause damage to the gearbox.

There is a clicking sound in the gear, which is similar to the abnormal sound caused by gear friction, which is obviously related to the operation of the three-gear control mechanism, and the key component of the shift operation is the "synchronizer".

You can try the following methods for gear clicking:

1. Check whether the gearbox oil is sufficient, too much oil can be added according to the situation, and the deteriorated oil should be replaced in time.

2. For the clicking sound caused by incomplete clutch separation, please step on the clutch low every time you engage the gear, if the phenomenon is not significantly improved, please check the clutch clearance, free stroke and other parameters.

3. The gears and synchronizers in the gearbox are seriously worn, resulting in too large clearance, and the gears and synchronizers are damaged by replacement.

4. If the gap between the bearing and the spline on the shaft is too large, replace the new bearing and thrust washer.

5. The shift fork shaft is seriously worn, and the shift fork shaft or fork should be replaced.

6. The shaft is bent and deformed, and the bearing is loose and causes abnormal noise, and the shaft and bearing are replaced.

Among them, the synchronous ring in the synchronizer is easy to be ablated, and the gear to be meshed will have an impact between the teeth, which will form a "click" noise and make it difficult for the gear to mesh! After disassembly, it was found that the synchronizer ring had been ablated to blue, and only the copper synchronizer ring needed to be updated to solve this abnormal noise.

1. The clutch and transmission gear synchronizer and synchronizer gear ring are abnormally worn, and there will be a snapping sound in this case.

2. If the clutch is not completely separated, there will be a jamming sound when the gear is attached, if you are sure that the clutch is stepped on to the end, there will still be a jamming sound in the gear. It's just that there is a problem with the clutch.

How to put the car in gear:

The regular car starts with a little clutch first, and then slowly refuels, and the two can be said to be synchronized.

The general habit of starting is: lift the clutch first, when it feels fast to the linkage point (when the car shakes the most), and then give oil, at this time, the clutch can not be loosened too fast, to pause for more than a second, until the car shakes to decrease, when the car moves forward smoothly, you can gradually release the clutch.

The reason why the car is loud is that the clutch separation is not complete when the gear is suspended, it may be um, there is no lack of lubrication, well, go to the four S shop to check it.

1. There will be more abnormal noises in the engine compartment, and most people also judge the abnormal noise of the engine compartment by the sound, usually a metal screeching sound or a howling sound;

2. If there is a "rustle" sound inside the gearbox during driving, and there is no more after stepping on the clutch or accelerator, there will be a sound similar to whistling when changing gears;

3. When driving and stepping on the accelerator or brake, there are always some abnormal noises in a certain part of the body, the sound is not loud, and it does not affect the driving of the Zhengsheng Hall, but it always makes people worry that there is a failure.

Extended content: What is the reason why the truck can't be clicked when the gear is hooked up?

This phenomenon is that the gearbox has an abnormal sound, in this case, it is not the internal parts that are damaged, but the debris inside, especially the dirty posture of the valve body has formed a blockage, so there is such a problem, which needs to be cleaned up in time, and the temperature of the gearbox can be effectively controlled to solve the problem.

Why does the gear have a friction sound?

First of all, see whether the clutch is stepped on to the end, and then look at the degree of wear and tear of the clutch plate, whether there are traces of damage to the pressure plate, you must step on the clutch in place, and at the same time, you must also master the correct method of the gear, and the method of hanging the gear is also very important.

First, the reason why there is a sound in the car 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.

Second, the solution of the sound of the car gear:

1. The clutch must be stepped on in place;

2. Check the linkage mechanism and tighten it;

3. Replace the damaged clutch plate;

4. Master the correct method of tagging, and the tag must be in place. ‍

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 really had problems. 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 emit a variety of sounds, but the sound does not mean that the car is faulty, in order to seep into Chang to avoid unnecessary disassembly, first of all, we must 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 damage to 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 human interference.

Summary. Hello, there are two common reasons why the car has a clicking sound when changing gears, one is that the clutch plates are slipping, which cannot completely interrupt the power transmitted by the engine, resulting in gear shifting. The second is that the internal synchronizer of the gearbox is damaged, resulting in the gear not being in place when the gear is meshed.

Hope mine can help you!

Hello, I have seen your question and am sorting out the answer, please wait for a while Hello, there are two common reasons why the car has a clicking sound when changing gears, one is that the clutch plate is slipping, which cannot completely interrupt the power transmitted by the engine, resulting in a lack of wheels in the gear shifting teeth. The second is that the internal synchronizer of the gearbox is damaged, and the conduction pants cause the gear to be not in place when meshing. Hope mine can help you!

First, the reason why there is a sound in the car 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.

Second, the solution of the sound of the car gear:

1. The clutch must be stepped on in place;

2. Check the linkage mechanism and tighten it;

3. Replace the damaged clutch plate;

4. Master the correct method of tagging, and the tag must be in place. ‍

1 Phenomenon: Clutch abnormal noise.

An abnormal rattle when the clutch disengages or engages.

2 Causes. 1) Lack of lubricant in the release bearing, resulting in dry grinding or bearing damage.

2) There is no clearance between the release bearing and the inner end of the release lever.

3) The oil stain and dust between the separation bearing sleeve and the conduit are serious or the separation bearing return spring and pedal return spring are fatigued, broken and falling off, so that the separation bearing return is not good.

4) The spline hole of the driven disc is loose with its spline shaft.

5) Driven disc damping spring annealing, fatigue or breakage.

6) The rivet of the friction plate of the driven disc is loose or the rivet head is exposed.

7) The pin holes of the double-plate clutch transmission pin, the intermediate pressure plate and the pressure plate are worn loosely.

Diagnosis and exclusion.

1) Press the clutch pedal slightly, so that the release bearing is in contact with the release lever, if there is a "rustling" sound, it is the release bearing sound; If it still rings after refueling, it means that the bearing is excessively worn, loose or damaged and should be replaced.

2) Press and lift the clutch pedal, if there is an intermittent collision sound, it means that there is a series of movements before and after the release bearing, and the return spring of the release bearing should be replaced.

3) Even when the pedal is pressed, if there is a sound when the clutch is just engaged or just separated, it means that the driven disc rivet is loose or exposed, and the driven disc should be replaced.

Summary: The abnormal clutch noise can mainly be considered from the aspects of excessive wear, looseness, tightness, and scraping in motion.