What Is the Application of Fifth Wheel?

The fifth wheel is the tool used for traction between the front of the car and the box, that is, the front of the car can be separated from the original box and tow other boxes, and the box can also be pulled from the original front and pulled by other fronts.

• What is the application of fifth wheel?

• Does the gap of the fifth wheel affect the use?

• How to connect the pneumatic connection of the fifth wheel?

What is the application of fifth wheel?

The fifth wheel can swing laterally and longitudinally, which can protect the frame of the heavy-duty transport tractor under different road conditions. Usually the double-axle traction seat is much higher than the single-axle type, and the lateral stability is not good during the high-speed turning process of the vehicle, so this type of fifth wheel is rarely used in ordinary road transportation.

Does the gap of the fifth wheel affect the use?

This effect is quite big. The weight of the semi-trailer is transmitted to the fifth wheel through the traction plate. If the two are not level, it will cause several problems (usually uneven left and right).

1. Because the traction plate and fifth wheel are in single-sided contact, the side of the vehicle in contact will be very worn during the situation, and the other side will not be stressed. After a long time, the saddle and traction plate may not be able to be used.

2. Because the fifth wheel is stressed on one side, the force applied to the wheel on the tractor is uneven, the wheel on one side of the vehicle will bear a larger load, while the other side will be subjected to a smaller force, and the wheels will wear unevenly. , and the axle will have the same problem.

Therefore, it must be adjusted. This situation is usually due to the manufacturing problem of the bottom frame of the semi-trailer, and the left and right sides are not on the same level after towing and installation.

How to connect the pneumatic connection of the fifth wheel?

A. Connect the two gas pipe joints (commonly known as handshake) on the tractor to the two gas pipe joints on the semi-trailer. At this time, the air supply line of the tractor is connected with the air supply line of the semi-trailer, and the control line of the tractor is connected with the control line of the semi-trailer (note the color of the connector: red is the air supply line, blue is the control line).

B. After the air joints are connected to each other, unscrew the semi-trailer air circuit connection disconnect switch on the tractor to make it in a ventilated state, otherwise it will not be able to supply air to the semi-trailer braking system, and the braking system will not work.

C. Start the engine, observe the air pressure gauge in the cab, and increase the pressure in the air storage tank of the tractor and semi-trailer to the specified pressure (usually 650-750kPa).

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