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2025
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Analysis of the causes of heavy clutch pedals The five most common factors are the most common
For car drivers, short drives are a pleasure. However, as a professional driver, driving is a physically demanding job. For professional truck drivers, the body is huge, the driving time is too long, and the intensity of work is self-evident. If the clutch pedal has a little temper at this time, it will make the cardholder feel physically and mentally exhausted.
The clutch pedal is one of the most frequently used devices by drivers, and it is used every time you change gears, and if the clutch pedal is heavy, it will make your left leg suffer after a long day of driving. In fact, the clutch has been designed with the driver's operating intensity in mind, and it will not be too laborious to operate under the normal condition of the system, but if it goes wrong, it may become very heavy. Today I will give you an analysis of several common reasons for the clutch pedal to be heavy.
● The reason for the heavy pedal is that the return spring has a large pulling force
In order to allow the clutch pedal to return to the standby position accurately and quickly when released, a return spring is designed at the pedal. If the phenomenon of pedal heaviness occurs after replacing the new spring, it is likely to be caused by too much tension of the clutch pedal return spring, which is relatively easy to solve, and it is enough to replace a spring with a smaller tension.
● The reason for the heavy pedal is that the clutch booster cylinder is damaged
At present, almost all heavy-duty truck clutches use a power assist system, which will be relatively light to operate under normal circumstances, but if the clutch power assist cylinder fails, it may cause insufficient power assistance. The final performance is that it is very heavy when stepping on the clutch pedal, if your clutch has a heavy operation problem, you may wish to check whether the booster cylinder is working properly, in addition, the inferior booster cylinder is more prone to such problems, it is recommended that you choose famous brand products.
● The reason for the heavy pedal is the low compressed air pressure
I have already talked about the heavy pedal caused by the damage of the clutch booster cylinder, but sometimes it is not necessarily caused by the booster cylinder itself. Because most of the power to drive the clutch booster comes from the compressed air in the air reservoir, if the compressed air pressure to the booster is too low, it will cause the phenomenon of insufficient power assist, so the compressed air pressure to the clutch booster should be checked first after such a failure.
● Insufficient lubrication due to heavy pedals
The clutch of the truck is separated by a booster cylinder (commonly known as a sub-pump) through a series of mechanical structures that drive the pressure plate, and there are several points in this structure that need to be lubricated. If the lubrication is insufficient and the friction is too high, it will cause the clutch pedal to be heavy.
For example, in some models, the clutch release fork shaft can only be connected to the transmission flywheel housing by a hose because this lubrication point is inside the flywheel housing. However, many times we will ignore the existence of this lubrication point when filling grease, resulting in excessive friction of the fork shaft causing heavy pedals, and even eventually causing the fork to be overloaded and fatigued and broken.
● The reason for the heavy pedal is that the release bearing is too tight
The reason why the clutch can realize the clutch function is completed by pressing and relaxing the clutch plate on the pressure plate, and the compression and relaxation of the pressure plate is completed by the fork drive release bearing. The separation bearing sleeve slides back and forth on the cover plate guide sleeve of the gearbox input shaft to control the separation of the pressure plate, if the matching clearance of the separation bearing and the guide sleeve is too small, it will cause excessive friction, and the driving force is wasted on the friction of the separation bearing and the guide sleeve, and the pedal is unavoidable.
● Afterword
The above failures are relatively common for clutch pedals to be heavy, but in fact, there are far more causes of heaviness. The whole clutch system relies on all components to work perfectly, and any link problem may cause a chain reaction, so if you encounter such problems, you must check from many aspects to prevent unnecessary maintenance losses.
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