Electric forklifts often leak oil during use. I believe that many driving masters will encounter such problems. If there is an oil leak, stop and check immediately, find the cause, and hurry up to repair it to eliminate potential safety hazards. Let's let the electric pallet truck
introduce you to the common causes of vulnerabilities in electric forklifts and the corresponding elimination methods, and share with you how to prevent the vulnerabilities of electric forklifts. This is the source of the problem! 1. Several common causes of oil leakage in electric forklifts and the corresponding elimination methods: . Internal leakage: It is common to cause problems such as inability or inability to lift the hydraulic cylinder of the forklift, (electric forklift) forks to slide down, and the mast to tilt forward. . The reason for the internal leakage and the cleaning method: 1. The wear gap between the valve stem and the valve body is too large. The long-term use of the distribution valve or the unclean oil accelerates the wear of the valve stem and the valve body, destroys the mating sealing surface, and causes leakage. oil. 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 the valve bodies The sealing ring fails, resulting in internal leakage; the valve body is damaged or the O-ring is aging or damaged during installation, and internal leakage between the valve bodies is also prone to occur under the action of oil pressure. If the valve body is damaged, it is necessary to stop grinding, change the O-ring seal, and tighten the bolts according to the order and torque requirements. 3. Safety valve spring failure If the safety valve spring fails, the hydraulic oil can force the steel ball to separate the valve position and flow into the oil spillway at a pressure lower than the system's regular pressure, forming an internal leakage and causing the system to fail. It is necessary to change the spring during treatment, and then use the adjusting screw to adjust the spring pressure to the regular 14Mpa. During adjustment, load 7.5t cargo according to the demand at 600mm from the load center. When the cargo is locked with a lock nut, the pressure at this time is the pressure that needs to be adjusted. 4. The multi-way reversing valve stem cannot be reset. If the valve stem cannot be reset and the groove is connected to the oil passage, internal leakage will occur (Houjie electric forklift). 1) Because the valve stem return spring is deformed or damaged, the spring force is reduced and the valve stem cannot be returned to the original position. The spring must be changed when repairing; 2) The valve body and the valve stem are not clean, resulting in greater resistance. The valve stem is difficult to reset, and the inside of the multi-way reversing valve must be cleaned during repair to eliminate resistance. 5. The cone valve is worn out 1) The cone valve is used to avoid backflow of oil. If the poppet valve is worn and the oil passage is not tightly closed, the hydraulic oil will flow back and the system will fail. When repairing, it should be ground or replaced. Elimination of backflow 2) Leakage of the valve body The sealing of the valve stem and the valve body is accomplished by O-rings. If the sealing ring is aged or damaged, hydraulic oil will flow out along the valve stem under the action of system pressure, causing leakage of the valve body. oil. It is only necessary to change the O-ring to eliminate this problem. 2. Ways to prevent oil leakage of electric forklifts 1. Pay attention to the role of various gaskets. Various gaskets are installed between the parts of the forklift stationary parts (such as each joint end face, each end cover, shell, cover gasket, flat flange cover, etc.), which play a sealing effect. Although the cushion is small, the effect is great. If the material, production quality and installation do not meet the technical specifications, it will not be able to seal and prevent leakage, or even cause an accident. Such as oil pan or valve cover, because of the large touch area, it is not easy to compact and cause oil leakage. Oil leaks at the rear oil seal of the crankshaft, and the oil will seep into the clutch, which wastes oil and causes the clutch disc to be stained, slipped and burned. 2. All fastening nuts need to be tightened according to the repair standard torque. It should not be too loose or too tight. If the packing is too loose or not tight, the gasket will leak oil; if it is too tight, the metal around the screw hole will bulge or the thread will slip and cause oil leakage. In addition, if the oil drain plug of the oil pan is not tightened or loosened, it is easy to cause oil loss, and it is more likely to cause damage to the machine caused by 'burning bushes and holding shafts'. 3. Replace the failed oil seal in time. Many moving parts on the forklift have oil seals, O-rings, etc. Improper installation of the oil seals, inconsistencies between the journal and the oil seal cutting edge, will deflection and throw off the oil; some oil seals will lose elasticity due to rubber aging after long-term use. If the sealing lip is damaged or cracked or the self-tightening spring fails, the oil sealing effect will be lost, and the qualified parts should be corrected or replaced according to the standard.
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