Under a certain pressure, the small concrete mixer has the function of pressure, will produce a certain power and start its operation, so that the concrete above can be mixed more fully. On the premise of insufficient pressure, it may affect the efficiency of the mixer. So how to solve the problem of insufficient pressure?
1. Check whether the hydraulic pump of small concrete mixer truck can output hydraulic oil. If it is a new hydraulic pump and there is no hydraulic oil output, it may be that the pump body has casting defects (shrinkage cavity, sand hole, etc.), which connects the oil suction chamber with the oil pressure chamber and loses the oil pressure capacity. It should be replaced by the manufacturer in time. If it is not a new hydraulic pump and there is no hydraulic oil output, it may be that the direction of the pump is wrong, If the parts are seriously worn or damaged, replace them in time.
2. If the hydraulic pump of small concrete mixer truck has oil output, check whether the overflow valve works normally. If it is abnormal, it may be that a valve in the pressure oil circuit is stuck due to dirt or other reasons and is in the oil return position, resulting in a short circuit between the pressure oil circuit and the overflow circuit, or the pipe joint is loose, or some valves in the pressure oil circuit leak seriously, or the seals of the hydraulic cylinder and hydraulic motor are damaged and leak seriously. The troubleshooting method is to disassemble the relevant valves for cleaning, check the size of sealing clearance and various sealing devices, and replace the damaged sealing devices.
3. If the output flow of the hydraulic pump of the small cement concrete mixer decreases significantly with the increase of the pressure, and the pressure does not reach the specified value, it is due to the increase of the clearance after the hydraulic pump is worn. The elimination method is to measure the volumetric efficiency of the hydraulic pump to determine whether the pump can continue to be used. The severely worn parts should be repaired or replaced.
4. The hydraulic system of small concrete mixer can establish normal pressure, but there is no pressure in some pipelines or hydraulic cylinders, which may be due to the blockage of pipelines, small holes, throttle valves, directional valves and other parts. At this time, check the pressure and oil passage section by section, find out the cause and eliminate it.
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