The hydraulic system of the mini excavator produces iron filings, which is a common phenomenon in some excavators, let's talk about it.
Iron filings were found in the hydraulic system of an ultra-small excavator. The oil tank and pipeline must be cleaned quickly, and a strong magnet must be placed in the hydraulic oil tank. There may be iron filings in places such as radiators. Even if the radiator is replaced, cleanliness cannot be guaranteed. How to deal with it? I want to install a magnet filter on the front of the big pump. I don't know if it works. "
Approximate measurement method of iron filings in hydraulic system of mini excavator:
The manufactured cylinder is shiny because it does not lose its luster at low speeds. Hair is caused by the passivation of pump or motor bearings rotating at high speed.
Judging the situation:
If it is relatively large scrap iron, which is easy to find in the fuel tank, then people think that the cylinder may be damaged.
If there is no major problem with the filter element of the hydraulic system, the valve and pump itself may not produce iron filings. But radiators and hard tubes are also possible. Of course, this situation only occurs when new cars or new parts are replaced.
The pressure on the return line is lower, so you can choose a filter with higher precision. If it's not in the fuel tank, it doesn't seem to be magnetic. Usually the flow of hydraulic oil in the pipeline is very large, and it is difficult for ordinary magnets to absorb it.
First of all, the engine water temperature is very high. After removing the thermostat, the small hole under the thermostat seat blocks the cork to prevent the hot water from being recycled.
Secondly, the gear pump separates the two sides to form a vacuum as the suction port. The volume on the squeezing side becomes smaller, and pressure is generated as a discharge port. The rear of the 3-shaped valve plate always faces the discharge port. Under the pressure of the pressure oil, the valve plate generates an axial force to squeeze the gear to enhance the seal. There is also the effect of automatic pressure compensation after wear.
Third, the smallest core in the driver's handle is mainly used for micro-operations.
Fourth, individual parts are often blocked, and it is necessary to check whether the connecting pipe is caused by internal skinning.
Fifth, the center of the oil splitter spring is thinner than the outer ring, and the outer ring should be the stroke buffer at the end of the stroke. The intermediate sleeve limits the stroke of the rod.
Sixth, the approximate judgment of iron filings: 1. Just being a cylinder will not lose its luster due to its slow speed. 2. Scrap iron is produced for pump or motor bearings because it rotates fast and has no luster.
Seventh, the second pilot pressure is normal, but the action is slow. Lathe hammer should consider whether there is dirt in the spool in the pilot handle to limit its stroke, so that the stroke is reduced (even if the operation is maximum), the pressure is sufficient, but the flow is insufficient. If the force acting on the valve stem is not enough, the valve stem opening is not enough, and the related actions will slow down.
Eighth, the joint action is slow or motionless. The relevant pilot secondary pressure is lower than 20KG.