1. When internal leakage occurs in the multi-way reversing valve, the working oil passage is connected to the oil return passage or the oil overflow passage, and the hydraulic oil flows directly back to the oil tank. The operation cannot be completed, causing the lifting hydraulic cylinder to be weak or unable to electric pallet lift truck
. , The fork falls by itself and the mast tilts forward by itself. The reasons for the internal leakage and the elimination methods are: (1) The wear gap between the valve stem and the valve body is too large. There are three grooves on the lifting and tilting valve stems of the directional valve. The grooves and oil passages can be connected. Or cut off the oil circuit and change the working mode. The gap between the valve stem and the valve body of a good distribution valve is very small, and there is very little oil leakage, so the hydraulic cylinder drops or tilts very little, and does not affect the work. However, when the wear gap is too large, the hydraulic oil under the pressure generated by the working pump will cause the oil in the working oil passage to communicate with the oil return passage or the oil spill passage and automatically return to the oil tank. The main reason is that the long-term use of the distribution valve or the unclean oil has accelerated the wear of the valve stem and the valve body, damaged the mating sealing surface, and caused oil leakage. If the valve stem is lightly worn during repair, the valve stem can be chrome-plated and polished; if the valve stem is severely worn, it needs to be replaced. (2) Oil leakage between valve bodies. Since the working oil passage, oil return passage and oil spill passage run through the three single-piece valve bodies, the tightness requirements between the valve bodies are very high. After installing the O-ring seal between the valve body, connect the valve body with bolts to achieve the purpose of sealing. If the tightening torque of the bolts is different, it may cause the valve body to warp. If the sealing ring fails, internal leakage occurs; if the valve body is damaged or the O-ring is aging or damaged during installation, internal leakage between the valve bodies is also likely to occur under the action of oil pressure. When repairing, if the valve body is damaged, it is necessary to grind, replace the O-ring seal, and tighten the bolts according to the sequence and torque requirements.
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