The use and maintenance methods of hydraulic pumps
1. Oil supply method of hydraulic pump
There are two types of direct axis inclined disc piston pumps: pressure oil supply type and self suction type. Pressure oil supply hydraulic pumps mostly use oil tanks with air pressure, and some hydraulic pumps themselves have oil replenishment pumps to supply pressure oil to the hydraulic pump inlet. The self suction of the self suction hydraulic pump is very strong. The hydraulic oil tank for pneumatic oil supply should wait for the hydraulic tank to reach the required air pressure before adjusting the operation of the machinery. When there is a lack of air pressure in the hydraulic oil tank, it will act as a machine and cause a pulling phenomenon between the hydraulic pump and the slider, resulting in abnormal wear of the return plate and pressure plate inside the pump. Select a plunger pump with a supplementary oil pump for oil supply. After use, the operator needs to check the plunger pump 1-2 times a day to check if the hydraulic pump is operating normally. If it is found that the speed of the hydraulic cylinder has decreased or the car is stuck, the oil replenishment pump should be checked for collapse, and whether there is any phenomenon at the edge of the impeller and whether the clearance of the internal gear pump is too large.
The oil level in the hydraulic oil tank of the self-priming plunger pump must not be lower than the lower limit of the oil gauge, and the quantity of hydraulic oil must be consistently met. The higher the cleanliness of hydraulic oil, the longer the service life of hydraulic pumps.
2. Bearings for hydraulic pumps
The main component of a plunger pump is the bearing. Assuming that the bearing has clearance, it cannot provide normal clearance for the three pairs of friction pairs in the hydraulic pump, and it will also damage the thickness of the static hydraulic support oil film of each friction pair, reducing the service life of the plunger pump bearing. According to the information provided by the hydraulic pump manufacturer, the uniform service life of the bearing is 10000 hours.
The clearance of the disassembled bearing cannot be checked without an inspection instrument, and only visual inspection can be used. If scratches or discoloration are found on the roller surface.
Let me explain to you the 7 mistakes in hydraulic maintenance
It is difficult to avoid damage to hydraulic oil pumps during long-term operation, and the reasons and maintenance methods for each damage are different. If the hydraulic pump repair operator, Mr. Cheng, lacks rich and diverse work experience and professional skills, then secondary damage will occur. Wuhan Hydraulic Repair will explain to you the reasons for the damage of the 7th hydraulic oil pump and the appropriate maintenance methods.
1： Because the piston rod and cylinder liner are related to transitional cooperation, when installing the cylinder liner, the piston rod should be deformed by heat first. Therefore, some maintenance workers will immediately heat the piston rod on fire to exceed the actual effect of encountering heat. That approach is very incorrect because the thickness of the piston rod is uneven in all directions, resulting in different levels of thermal expansion and contraction. Heating with fire can cause uneven heating of the piston rod, which can easily cause deformation; The surface of the piston rod will also adhere carbon ash, reducing the service life of the piston rod.
2： In hydraulic maintenance, many positions of the anchor bolts have specific torque requirements, such as the gearbox, cylinder head, wheel rim, crankshaft, and front axle assembly. The tightening torque is often specified in the instructions and should not be changed arbitrarily. If incorrect anchor bolts or torque are applied, it may cause a component of the hydraulic oil pump to loosen, leading to damage.
3： When the hydraulic oil pump is overloaded during operation, or when the water flow in the storage tank is insufficient or the heat pipe is not well cooled, in order to quickly cool down after working for a long time, immediately add cold water to the storage tank. This behavior is incorrect and may lead to cylinder head and engine block explosions. People should add coolant to the hydraulic oil pump after cooling to ensure the actual heat dissipation effect of the heat pipe.
