Rolling bearings in the process of use due to its own quality and external conditions, its bearing capacity, rotational accuracy and friction reduction performance will change, when the performance index of the bearing is lower than the use of the requirements and can not work properly, there will be machinery and equipment to stop running, the function of damage and other abnormal phenomena. If effective maintenance procedures are taken in bearing mounting and dismounting, lubrication, pollution prevention and personnel training, online inspection and timely troubleshooting, the above failures can be avoided. Bearing mounting and dismounting should pay attention to the use of appropriate tools and methods Bearing mounting is a strict maintenance work, the good or bad mounting, directly affect the accuracy, life and performance of the bearing.

　　Therefore, special bearing tools must be used for mounting and dismounting to simplify the mounting process and avoid damage to the bearings and associated shafts, housings and seals. Bearing mounting tools must be suitable for all bearing sizes and types. For example, mechanical tools such as cushion rings are usually used, and small bearings can be mounted using padded steel plates, baking ovens or induction furnace heating. The heating makes the inner ring of the bearing expand and set on the shaft, and as the bearing cools, the inner ring shrinks, achieving a solid fit between the bearing and the shaft.

　　Can also be used in the form of press fit, that is, the use of a cylinder sleeve, the top to the collar, in the interference fit on the collar to apply assembly force. For tapered bore bearing mounting is generally used to lock nut mounting or heating mounting method for thrust bearing mounting, generally is the case of shaft rotation, the inner ring and shaft for interference fit, outer ring and bearing seat for clearance fit. Therefore, the center ring of the two-way thrust bearing should be fixed to the shaft to prevent rotation relative to the shaft. In addition, the bearing puller and other disassembly tools can effectively prevent damage to the parts near the bearing. When mounting and dismounting, the bearing rings should not be struck directly with a hammer.

　　Proper lubrication prolongs bearing life. Keeping bearings lubricated with the proper amount and grade of clean oil or grease is also the most important maintenance procedure. The performance of lubricants includes the degree of erection, the ability to form oil film and the consistency of grease. The criteria for lubricant selection include the operating temperature range of the equipment, speed, environment and other operating conditions. Bearings used at normal speeds and temperatures are usually suitable for grease. For higher speeds or where heat must be dissipated from the bearing, a circulating system with a continuous supply of clean lubricant is used. Grease has a good adhesion and prevents contamination and moisture.

　　The replacement interval of lubricants and greases depends on the operating temperature and other environmental factors. Contamination prevention measures contaminants such as water or chemicals can corrode bearing surfaces or damage the lubricant, seals can effectively prevent contaminants from entering the bearing and extend the life of the bearing. Frictional contact and frictionless gap or labyrinth seals are two basic forms, and if one form of seal is not effective, a combination of the two can often enhance the seal. Cleanliness is a key in the use of bearings, which must be kept free of contaminants, dust, cutting dust and other hard and abrasive particles, as well as soft particles such as fibre, paper and plastic, are all harmful. Solid particles can cause dents in the raceway surface, disrupting lubrication conditions and accelerating wear. To prevent bearing failure, the most important thing is to have a good quality workforce. In the enterprise, the training of in-service employees should be focused on improving practical skills.

　　At the same time, bearing tools, monitoring instruments and maintenance techniques are constantly being innovated and developed, and their technical content and complexity are increasing, all of which require focused training. On-line monitoring and timely troubleshooting with vibration meters, digital temperature meters, stethoscopes and other simple instruments can help maintenance personnel detect faulty bearings. The use of multiple types of fault monitors for online monitoring of multiple parameters is very effective in accurately detecting hidden faults in a timely manner.

　　Engineers must continue to make adjustments if they hear bearing noise or test the bearings for heat.

　　The principle of choosing lubricants for vehicles

　　How to choose internal combustion engine oil
　　(1) According to the characteristics of internal combustion engine and vehicle, i.e. load and speed, choose oil. High load and low speed, such as some large bulldozers, cranes and drilling rigs, etc., generally choose viscosity lubricants, such as SF40, CD50, etc., light load and high speed, such as small cars, jeeps, small power equipment generally choose viscosity smaller lubricants, such as SG15W/40, SF30, etc.
　　(2) According to the harsh degree of internal combustion engine work. For example, if the temperature of the first ring area of diesel engine is higher than 230--250℃, and the reinforcement factor is greater than 5, the diesel engine oil for boosting should be chosen above CD, such as CD40, SG/CD40, etc. For gasoline engine, the oil is selected according to the compression ratio and whether there is crankcase positive pressure gas exchange, exhaust gas recirculation and catalytic converter, etc. The larger the compression ratio, the higher the oil grade is selected.
　　(3) Oil capacity and power ratio is also a factor for choosing oil. Oil capacity and power ratio are also factors for choosing engine oil. Oil capacity is not demanding on the quality of oil, oil capacity is small on the quality of oil requirements. General European production of small engine size, high power, requiring the use of high quality oil, such as SHSJ.
　　(4) According to the region, season, temperature oil selection. Winter cold areas, should use small viscosity, low pour point oil or multi-stage oil, such as China's northeast, can choose SF10W/30, SH5W/30, etc.; year-round high temperature areas, such as Hainan Province, the two Guangdong areas, can use higher viscosity oil, such as SF40, CD50, etc.
　　(5) According to the engine wear situation oil selection. The new engine should use the oil with less viscosity (consider energy saving), while the engine with larger wear, cylinder wall and piston clearance should use the larger viscosity (consider sealing).
　　2、How to choose gear oil
　　(1) automobile rear axle double curve gear must use GL-4, GL-5 grade oil, GL-3 oil and old grade 18 #, 24 # double curve gear oil can not be used.
　　(2) According to the ambient temperature, use different viscosity gear oil. For example, 75W/90 is especially suitable for extra cold winter; 80w/90, 85w/140 oil is common in East China, Central China and North China in winter and summer, and used in South China and Southwest China in winter; 90, 140 oil is common throughout the country in summer and available in South China in winter.
　　(3) Select the performance level according to the vehicle load condition. GL-4 is applicable to medium and low load vehicles, GL-5 is applicable to heavy load vehicles.
　　(4) If the car manual transmission requires the use of gear oil, generally choose 80W/90 or 85W/90 oil, and it is best to use GL-4 and GL-5 grade oil.

　　(Run the world big country Dragon Dragon out of the East Tengda world Dragon three types of spherical roller bearings Liu Xingbang CA CC E MB MA)

　　Equipment use maintenance and repair rules

　　1. The use of equipment requirements.

　　(1) employees in the independent operation of the equipment before, should participate in the equipment safety operating procedures, maintenance knowledge training, obtain the operating certificate before the machine operation.

　　(2) The operator should do "three good", "four will".

　　"three good" that is, good management of equipment, good equipment, good maintenance equipment.

　　"Four will" that is, will use the equipment, will maintain the equipment, will check the equipment, will troubleshoot the general.

　　(3) the equipment operator "five disciplines":.

　　A. The implementation of the fixed person fixed machine operation, with the operator's license to use equipment, and strictly comply with the safety operating procedures.

　　B. often keep the equipment tidy, according to the provisions of the oil, to ensure reasonable lubrication.

　　C. Comply with daily inspection and shift changeover system.

　　D. Take care of tools and accessories and do not lose them.

　　E. Find abnormalities, stop and check immediately, and if you can't handle the problem, you should report and cooperate with maintenance personnel to eliminate it.

　　4. Equipment maintenance "four requirements": (1) neatness

　　(1) neat: tools, workpieces, accessories placed neatly, equipment parts and safety guards are complete, the line, pipeline integrity.

　　(2) clean: clean inside and outside the equipment, the sliding surface, screw, rack, etc., no oil, no bruises, no oil leaks, no gas leaks, no electricity leaks in all parts, cutting garbage, corners, etc. clean.

　　(3) lubrication: timely refueling, oil change, oil quality meets the requirements, oil pot, oil gun, oil cup, oil nozzle complete, bright oil markers, smooth oil path.

　　(4) safety: implement the fixed person and machine and handover system, familiar with the structure of the equipment, comply with the operation and maintenance procedures, reasonable use, careful maintenance, monitoring of abnormalities, and no accidents.