Introduction of Semi Trailer Landing Gear
The main components of the semi trailer landing gear are two-speed gearbox, support sleeve, support rod, transmission screw (crank handle), and support plate. Its structure is simple, but it has very important functions. Only through a gear box and a crank handle, the left and right landing gears can be controlled to lift and lower at the same time. There are two gears: high and low. When using the semi trailer landing gear, it requires a relatively flat road surface. It is very easy to use and efficient to operate.
Precautions for Semi Trailer Landing Gear
Either fast gear or slow gear can be used when the semi trailer is empty, but it is strictly forbidden to use fast gear when it is under heavy load. During the driving process of the semi-trailer, the landing gear can be used in different ways according to different gears. When no goods are being transported, its gear speed is not limited, but when carrying goods, especially when carrying particularly heavy goods, a slow gear should be used.
When detaching from the tractor, pay attention to whether the ground is flat. If necessary, pads should be placed under the support plate to ensure that the support surface is basically level and consistent.
When the landing gear is retracted, the rocker must be returned to the original position to prevent the landing gear from being damaged by the "kick" phenomenon during walking.
Why Is there Noise Inside The Landing Gear?
The internal components of the semi trailer landing gear hydraulic pump are excessively worn, such as the wear and tear of the matching parts such as the cylinder block and the valve plate of the plunger pump, the plunger and the plunger hole, which can cause serious leakage in the hydraulic pump. Flow pulsation will be generated when the liquid is used causing high noise. At this time, the deflection angle of the variable mechanism of the pilot system can be appropriately increased to improve the influence of the internal leakage of the landing gear on the output flow of the pump. The hydraulic pump distribution plate is also one of the important components that easily cause noise.
The Cause of Noise Inside The Landing Gear
During use, the distribution plate of the landing gear will shorten the unloading groove and change the unloading position due to surface wear or sludge deposition at the opening of the unloading groove. This will result the phenomenon of trapped oil and then cause high noise. During the repairing process, the distributing plate repaired by flat grinding will also have the phenomenon that the unloading groove becomes shorter. The reasons and maintenance methods for landing gear noise are as follows:
1. Air is mixed into the oil of the landing gear and cavitation is formed in the front cavity of the pilot valve, which causes high-frequency noise. At this time, the air should be exhausted in time and the outside air should be prevented from re-entering.
2. During use, the needle valve is excessively worn due to frequent opening so that the needle valve cone surface of the landing gear cannot be closely fitted with the valve seat. This will result unstable pilot flow, pressure fluctuations, and noise. When this happens, the landing gear should be repaired or replaced in time. .
3. The pressure regulating function of the pilot valve is unstable due to the fatigue deformation of the spring, which makes the pressure fluctuate and causes noise. The spring should be replaced.
How to Choose The Right Semi Trailer Landing Gear
The semi-trailer landing gear is the main part of the semi-trailer. It is used for the support and lifting of the semi-trailer and other special trailers after laying. It adopts the structure of compact inner and outer square tube and reinforced mounting bracket.
Cold-drawn lead screw and forged gear are used and screw seat are designed with floating structure.The lifting nut is completely sealed in the grease cavity so that the lifting nut can receive new grease lubrication during the up and down movement of the support device, which is more labor-saving and bears high capacity.
When choosing landing gears, be sure to pay attention to a few things:
Shorting materials and poor design with small capacity marked high standard:
Some immoral manufacturers often take advantage of the national standard and confuse static load with dynamic load. The international common landing gear model marking method is to mark the dynamic load. The load is 24T, which should be marked as the model 12T semi-trailer landing gear, but the bad manufacturer will mark it as 24T semi-trailer landing gear. Its price should of course be very different from the actually 24T dynamic load landing gear. In fact, these are small semi-trailer landing gears only have dynamic load of 12T.
Cut corners and use shaddy products:
In some areas in China, the landing gears many manufacturers produce have the appearance that are not much different from the mainstream products, but the actual weight is 10KG to 20KG different. The materials used, the thickness of the steel plate, the screw, the nut , gears and other key parts are all tacky. They should not be used at all since there are many serious hazards.
Fraudualent practice to confuse the public:
Some small enterprises use trademarks and names similar to those of mainstream products, which causes misunderstandings to consumers who do not know the inside story and are often deceived.