Dump semi-trailers are suitable for transporting bulk goods such as coal, ore, and building materials. Dump semi-trailers can be divided into two categories according to their uses: One type is heavy-duty and super-heavy dump trailers for off-road transportation, which are mainly responsible for transportation tasks such as large-scale mines and projects, and are usually used in conjunction with excavators. The other type of light, medium and large ordinary dump trailers used for road transportation are mainly responsible for the transportation of loose goods such as sand, soil, coal and so on, and are usually used in conjunction with loaders.
Let’s take a look at the common problems and solutions for rear-turning container dump semi-trailers:
1. Why does the cabin go down when the lift switch on the instrument panel is pressed, and why does the cabin lift when the down switch on the dashboard is pressed? Answer: This is caused by the solenoid valve controlling the lifting and lowering being connected reversely. There are three ways to eliminate it: ① Swap the wires of the lift and lower switches on the instrument panel; ② Swap the wires of the solenoid valve that controls lift and lowering; ③ Swap the two air pipes of the distribution valve.
2. The dump truck does not lift? Answer: If the dump truck does not lift, the following components should be checked. Check the power take-off: First check whether the transmission shaft connected to the oil pump rotates. If it does not rotate, it means there is a problem with this part of the power take-off (there is a problem with the solenoid valve of the power take-off or the power take-off itself); if it rotates, it means there is a problem with the power take-off. If there is no problem with the device, further investigation should be carried out.
Check the oil pump: ① Whether the rotation direction of the oil pump is correct. Stretch out your left hand, with your thumb facing the splines of the oil pump. If the thumb is in the same direction as the other fingers, it is a left-hand pump, and vice versa. ② Whether the oil pump is damaged. If the oil pump wears, the high and low pressure chambers of the oil pump will be connected, making it impossible to pump oil.
Check the distribution valve: ① Whether there is air in the air pipe on the distribution valve. Press the lifting and lowering switches to check whether there is air in the two air pipes on the distribution valve. If there is no air, it means that the solenoid valve that controls lifting and lowering is faulty and the solenoid valve should be replaced. ② Whether the distribution valve is damaged.
3. Is the lifting speed of the carriage adjustable? Is it a fault if it automatically descends quickly? Answer: The lifting speed is not adjustable. Falling too fast is a malfunction.
4. What are the important hydraulic components of the hydraulic lifting system and what are their functions? Answer: Oil pump - supply oil; check valve - control the flow of oil; distribution valve (rotary valve) - control the lifting and lowering of the carriage; oil cylinder - generate thrust.
5. How to solve the climbing problem during lifting? Answer: Sometimes during the lifting process of the car, a climbing phenomenon will occur. This phenomenon is mostly caused by the air intake in the hydraulic system and the cylinder being filled with an oil-air mixture.
6. Why does the gear pump have "beating teeth"? How to exclude? Answer: Sometimes when the power take-off takes power, the gear pump makes a rapid "click, click..." sound. This is mostly caused by insufficient oil intake from the oil pump. If this phenomenon occurs in a new car, it may be caused by the oil pump inlet pipe being too thin or the oil inlet pipe being sucked flat. The oil inlet pipe should be thickened and an oil inlet pipe with high strength and hardness (with steel wire in the oil pipe) should be used; a dump truck that has been used for a period of time will It may be that the oil inlet pipe is aged and deflated, or the filter at the oil outlet of the oil storage tank is blocked, causing the oil inlet to be blocked. If all possibilities have been ruled out, the only problem is that the oil pump is damaged and the oil pump should be replaced in time.
