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Tham khảo tài liệu 'lubricants and hydraulic fluids episode 2 episode 6', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | EM 1110-2-1424 28 Feb 99 c. Maintenance. For all of the bearing types that use oil the most common type of oil found is RO turbine oil. For the greased bearings a lithium-based grease designated NLGI 2 is the most common. Maintenance problems with these machines center around oil changes and grease changes. 1 Oil changes sometimes do little good if the oil is cold and particulate matter has been allowed to settle out. This problem is resolved by changing the oil after the pump has been running at normal operating temperature. Running the pump helps mix particles into the oil before it is drained. Another method that may work is to drain the oil then flush the oil reservoir with warmed oil discard the oil then fill the bearing. This can help to dislodge foreign matter that has settled to the bottom. 2 Another problem is condensation caused by thermal cycling of the motor as it starts and stops. A desiccant air breather on the bearing equalizing air intake will prevent extra moisture from being taken into the reservoir. Proper flushing of the oil reservoir can help carry out water that has collected in the low spots. 3 Having adequate grease in rolling element bearings is important but too much grease can cause overheating and bearing failure. Maintenance procedures must be followed to avoid over greasing. 4 Bearing housings need to be disassembled and all the old grease cleaned out and replaced at intervals. 11-4. Gears Gear Drives and Speed Reducers a. General. Lubrication requirements for gear sets are prescribed by the equipment manufacturers based on the operating characteristics and ambient conditions under which the equipment will operate. Often the nameplate data on the equipment will indicate the type of lubricant required. If no lubricant is specified on the nameplate recommendations should be obtained from the equipment manufacturer. If the manufacturer is unknown or no longer in business a lubricant supplier should be consulted for recommendations. b. .