2. Do not flush the fuel tank with compressed air. Before welding the gasoline tank, the gasoline in the tank must be washed. Some repair personnel use compressed air to flush the fuel tank. Because of the small size of the tank port, gasoline molecules may generate sparks due to strong collisions in the tank, which may cause explosions and personal injury or death. Use cleaners to clean the fuel tank.
3. Spring pads cannot be used instead of locking tabs. After the connecting bolts between the driven drum hub and the driven drum of the steering clutch of the Dongfanghong-75 tractor are fastened with bolts, they are locked with locking plates. For ease of removal, some robots use spring washers instead of locking tabs, and some add a flat washer. Because the washer is thicker than the locking piece, the top of the connecting bolt rubs against the left and right side walls of the rear axle housing after assembly, plus the pulling of the joystick during the operation of the tractor, the axial movement of the rear axle shaft occurs, and the corresponding position on both sides of the housing is ground. A deep annular groove causes the strength of the casing to be greatly reduced. Once the tractor is overloaded, the rear axle housing can easily break from the ring groove.
4 can not be free to configure oil drain plugs. The oil drain plug on the oil shell is made of magnetic material, which can effectively absorb the iron scraps in the oil and reduce machine wear. Can not be made of ordinary steel or other screw plugs instead.
5. Do not warm the piston with an open flame. Some maintenance personnel in the replacement of the piston, in order to successfully assemble the piston pin, go down to the point of the diesel piston, plug some rags, and then ignite the direct heating of the piston. The harm to do this: First, the piston heat uneven, easy to deform; Second, after the rag burning ash is not easy to remove, will accelerate the cylinder sleeve piston ring wear; Third, it takes a long time to clear the cloth dust, the piston temperature will drop, install the piston When the pin is still hammered by hand, it will cause further deformation of the piston. The right way: Put the piston into 120°C oil or 100°C water, then take out and install the piston pin immediately.
6. Dilute sulfuric acid cannot be added when the storage battery is depleted due to lack of stored electricity. When the battery is in use, the sulfuric acid in the electrolyte is not consumed, but it gradually shifts to the two plates as the discharge progresses, and the density of the electrolyte drops. As long as the battery is charged with a DC power supply, sulfuric acid will precipitate from the plate, and the electrolyte density will be restored as before. When the battery is not sufficiently charged, adding dilute sulfuric acid will not only increase the power but also damage the battery. The correct approach is to charge the lossy battery after it is unloaded.
7. It is not possible to bend the hydraulic pipe when disassembling and assembling it. The pressure loss caused by the bent hydraulic pipe will far exceed the normal value. The greater the pressure loss on the pipeline, the lower the effective pressure delivered to the parts that do the work. Moreover, after the pipe is bent, the flow rate and direction of the hydraulic oil at the bend suddenly change, and the resulting hydraulic shock has a great influence on the service life of the hydraulic pipe, and even causes the pipe to suddenly explode.
8. The length of diesel high-pressure tubing cannot be changed at will. Because the diesel injection process time is very short, the high-pressure fuel pipe delivers diesel fuel to the injector with a certain pressure and speed through the form of pressure wave. Because the high-pressure fuel pipe has a certain elastic deformation, its length and aperture directly affect the diesel injection process. If the length of the high-pressure fuel pipe increases, its volume also increases, which not only increases the time for transmission of the pressure wave, but also causes changes in the fuel injection law, leading to delay in the injection time and increase in the duration of the injection, which affects the normal operation of diesel combustion, resulting in diesel engines. The power drops and the heat loss increases.
9. Can not butter in the ring groove. In order to avoid misalignment of the piston ring during installation, some of the pilots put grease on the ring groove of the piston ring to stick the ring, which is very harmful. When the engine is working, the butter forms a jelly when it is hot, affecting the elasticity of the piston ring, reducing the sealing performance, and producing carbon deposition, which aggravates the wear of the machine parts. Http://Content/e426ad9d-39e7-413d-8032-01c8355c5cda?cType=2
Low Speed Centrifuge,Glass Centrifuge Tube,Auto Lock Rotor Centrifuge,Digital Hematocrit Centrifuge
Guangdong Widinlsa International Co.Ltd , https://www.gdwidinlsa.com