Clutch pedal heavy cause analysis

As a professional truck driver, driving is a very laborious and heavy work. If the pedals of the clutch are a little tempered, the truck friends will feel physically and mentally exhausted. The clutch pedal is one of the devices that the driver uses more frequently. It will be used every time you change gears. If the clutch pedal is heavy, driving your car for a whole day will cause your left leg to be tortured.

1. Return spring has a large pulling force

In order to allow the clutch pedal toreturn to the standby position accurately and quickly when released, a returnspring is designed at the pedal. If the pedal is heavy, it occurs after the replacement of the new spring, that probably the clutch pedal return spring tension is too large.

This problem is easy to solve, just replace a spring with a small tension.

2.Cltuch Booster cylinder damage 

At present, almost all heavy-duty truck clutches use a power-assisted system. Under normal circumstances, the operation will be lighter. However, if the Cltuch Booster cylinder fails, it may cause insufficient power. The final performance is that the clutch pedal is very heavy.

If you have a heavy operation problem with your clutch, check if the power assist cylinder is working properly. In addition, the inferior booster cylinder is more prone to such problems. It is recommended that you choose a famous brand product.

3.Low compressed air pressure

I have already mentioned the heavy pedal caused by the damage of the Cltuch Booster, but sometimes it is not necessarily caused by the booster cylinder itself. Since most of the power to drive the clutch booster comes from the compressed air in the air reservoir, if the pressure of the compressed air to the booster is too low, it will cause insufficient assist.

In the eventof such a fault, the pressure of the compressed air to the clutch booster should be checked first.

 4.Insufficient lubrication

The clutch of the truck is separated by abooster cylinder (commonly known as a sub-pump) through a series of mechanical structures to drive the platen. There are several points in the structure that need lubrication. If the lubrication is insufficient and the friction is too large, the clutch pedal will be heavy.

For example, the clutch disengagement fork shaft of some models, since this lubrication point is inside the flywheel housing, it can only be connected to the gearbox flywheel housing via a hose. However, many times when we are adding grease, we will ignore the existence of this lubrication point, causing the friction of the fork shaft to be too heavy, causing the pedal to be heavy, and eventually causing too much fatigue fracture of the fork load.

5.Separation bearing too tight

The reason why the clutch can realize the clutch function is that the pressure plate is pressed and loosened by the pressure plate, and the pressing and loosening of the pressure plate is performed by driving the release bearing through the fork. The separation bearing sleeve slides back and forth on the cover guide sleeve of thetransmission input shaft to control the separation of the pressure plate. Theseparation bearing sleeve is placed on the cover guide sleeve of the input shaft of the transmission, and is slid back and forth to control the separation of the pressure plate. If the clearance between the separation bearing and the guide sleeve is too small, the friction will be too large. The driving force is wasted on the friction of the separation bearing and the guide sleeve, and the heavy pedal is inevitable.

These are some common faults cause the clutch pedal to be heavy and relatively, but in fact, the cause of the heavy is far more than these. The entire clutch system relies on all components to workperfectly together to work properly. Any problem in any part of the chain maycause a chain reaction. Therefore, if you encounter such problems, you must start from many aspects to prevent unnecessary damage caused by maintenance.