The clutch in a semi-truck is located near the accelerator pedal, and it is helpful to transfer the power from the engine to its transmission system. As a result, the transmission system transfers this power to the wheels for forward propulsion. Double clutching is the synchronization of engine and transmission speed for smooth driving.
How To Double Clutch a Semi-Truck? You can double-clutch a semi-truck by properly pressing the clutch pedal. Shift the transmission towards the neutral and release the clutch pedal so your truck moves forward. Press the accelerator slightly to gain speed, then press the clutch pedal again. Shift the transmission to the upper gear, including three or four, and release the clutch simultaneously.
Many commercial vehicle drivers use a double-clutching procedure when they stop at the traffic signals for a few minutes and have to move forward when the signals turn green. It allows the drivers to smoothly shift from neutral to the upper gears without stressing the transmission components.
How do you double clutch a semi-truck?
Double clutching is the synchronizer device, which helps match the engine’s speed with the transmission for gear shifting without stalling issues and sudden jerks.
It involves three components: the engine, clutch pedal, and transmission. It allows all the vehicle components to move simultaneously at the same speed for smooth driving conditions.
You have to press the clutch pedal twice to double-clutch the semi-trucks. Properly press and hold the clutch pedal for a few seconds to limit the output shaft speed.
It is also essential to shift the truck’s transmission towards the neutral. Engage the neutral gear and slowly release the clutch for forward wheel propulsion.
Press the accelerator pedal simultaneously to slightly increase the speed, and press the clutch pedal again.
Engage the desired gears, including the third and fourth, while pressing the clutch pedal and releasing it slowly to move forward and accelerate smoothly.
Why would you double clutch a semi-truck?
Double clutching is tricky, and many new drivers cannot do it smoothly. Expert semi-truck drivers have a better grip on it and can do this quickly. You have to perform this procedure in older models because of the presence of manual transmission and the absence of synchronizers.
It means you are increasing the rotations per minute so they can match the speed of the transmission shaft for smooth gear shifting.
You can experience a jerky movement while shifting from higher to lower gears and vice versa. A sudden jerk comes because of the speed difference in both shafts.
In addition, you can also face slight days while shifting from lower to higher gears because of the difference in engine and transmission shaft speed.
It means you have to press this component two times. You release the gear the first time and then engage the desired gear after increasing rotations per minute of the engine.
It provides smooth driving on the road while changing speed. These are also beneficial while downshifting, shifting the transmission from higher to lower gears.
You can smoothly downshift your commercial vehicles without delay or sudden jerks. Moreover, it is beneficial for drivers who prefer to downshift the transmission to slow down their trucks instead of using the brakes.
Reduce wear and tear on the gearbox
All commercial vehicles, including semi-trucks, have automatic and manual transmission systems. Automatic and manual transmission is also known as gearboxes.
You can use the transmission system to select different gears from lower to higher and vice versa to adjust speeds while moving on different roads.
Double clutching the trucks while driving is helpful to extend the life of gearboxes. Frequent gear shifting from higher to lower can affect the longevity of gearbox components.
Reduce the stress on its parts by smoothly downshifting the transmission. However, drivers need training to perform this method.
I also learned this technique from professional training programs and watching YouTube videos. Using this system for gear shifting helps reduce the severe damage to the vehicle’s components.
Reduce stalling issues
Many semi-truck drivers complained that they face stalling issues while shifting gears. You can face sudden loss of power while shifting the transmission from lower to upper gears because of loss of power.
The stalling issue irritates drivers because they have to wait a few seconds to restart their vehicle. In addition, it can also disturb the normal traffic flow when you stop in the lane for 20 to 30 seconds.
The stalling problem comes because of changes in engine speed. Double clutching is best to reduce the stalling issue and decrease wear and tear on the engine and transmission parts.
It is helpful to match the engine RMP with the transmission output shaft to quickly shift gears without losing power.
Failed clutch linkage
Clutch linkage failure is a common problem that interrupts smooth driving conditions. You feel difficulty in operating clutches because of the failure of linkage.
The most common issues due to failure linkages are stiffing and slipping of the clutch while changing gears.
Poor lubrication, hard pressing, and maintenance issues affect the longevity of the flywheels and their linkages.
Extend the life of synchronizers
Synchronizers are mechanical devices present in mostly new and older models of semi-trucks. These are costly equipment and hard to repair because of the complexity of their functionality.
Synchronizers help match the engine power with the transmission output shaft.
Many old truck drivers still prefer to use double clutching while gear shifting instead of synchronizers because, over time, usage increases the risk of premature wear and tear, which is costly to repair.
Better fuel economy
Double clutching for gear shifting is beneficial because it provides better fuel economy. It offers good fuel efficiency because of smooth gear shifting.
Fuel efficiency improves because of fewer chances of interrupting the power supply from the engine to the transmission.
There is no time lag between gear shifting, which can affect the engine power supply. In addition, you cannot face stalling and sudden jerks, which cause sudden loss of power and affect fuel efficiency.
It ensures the continuous energy supply to transmission parts without little or no power loss.
Reduce resistance and uneven noise
Resistance and uneven noises are significant problems in heavy-duty vehicles, including semi-trucks, while gear shifting. These are larger and are designed for hauling heavy weights.
Gear shifting and brake application in these larger vehicles is not as smooth as in cars and other small pickup trucks because of their lighter weight construction.
You can hear the grinding noise in the transmission components while shifting from lower to higher gears because of sudden speed and power supply changes.
It provides smooth shifting by matching the engine’s power with transmission parts for quick wheel spinning.
Do all semi-trucks need double clutching?
All semi-trucks do not need double clutching because some of their newer models are equipped with mechanical devices known as synchronizers.
Synchronizers are part of the transmission system; you do not have to press the clutch pedal twice for gear shifting.
These synchronizer devices match the speed of the desired gear with the clutch speed and then sync it with the transmission output shaft for smooth gear shifting.