The abnormal sound of the transmission, Lianmei Mei, Zhanghaifeng, Agricultural Machinery Supervision Institute, Zhaodong City, Heilongjiang Province, Zhengzhou, Heilongjiang Province, Zhengdong City, the abnormal sound of the transmission, mainly due to the bearing wear and looseness and the abnormal interference between the gears, This kind of noise can be roughly divided into two kinds of neutral sounds. The engine is idling, the transmission is in an abnormal position when there is a neutral position, and the sound is lost when the clutch pedal is depressed.
Cause of failure 1 When the transmission and engine are installed, the crankshaft is not concentric with the centerline of the transmission shaft. 2 The first shaft front bearing wears dirt and fluffs. 3 The permanent meshing gear wears and emits a uniform sound. When the respective gear teeth are broken, a regular gap impact sound is emitted. 4 The constant meshing gears are not replaced in pairs during repair, and the meshing is poor. 5 The first shaft bearing is damaged. 6 Old gears were replaced with new bearings, resulting in uneven wear on the tooth surface. After switching to a new bearing, the tooth surface meshing position changes. 7 The first shaft or bearing pressure is not uniform.
After the gear is blocked, the sound phenomenon is caused by the fact that the transmission is slammed into the gear and is caused by the interlocking gears, which are caused by the impact and the resonance of the transmission cavity during operation. 2 When the tractor travels faster than 301, an abnormal sound is emitted, and the higher the speed, the louder the sound. When the speed is low or slow, the sound is reduced or disappears.
Cause of failure 1 The gear is not properly replaced, and the normal engagement of the gear is destroyed after the shaft or bearing is replaced. 2 The keyway of the gear is worn loose. 3 The matching clearance of the main driven gear is too large.
Diagnosis of the fault 1 The tractor has a dry friction of metal during driving. If the hand is touched by the transmission case, it has a hot feeling. If there is a lack of lubricating oil or the oil is degraded, the oil quantity and oil quality should be checked and replaced if necessary. 2 When the neutral gear is heard, the abnormal sound is heard. After the clutch pedal is pressed, the sound disappears. Generally, the front and rear bearings of the shaft wear loosely or frequently mesh the gear. If you switch to any gear, it will ring. Seriously loose bearings should be replaced. 3 When the tractor starts or drives, when the throttle is changed to change the speed of the vehicle, the internal gear surface of the transmission is heard to have a mutual impact sound, and the sound disappears when the vehicle speed is stable. Then the gap of the main driven gear is too large. If the speed of the car is louder and the load is too strong, the gap is too small. In severe cases, the maintenance should be removed. 4 When the tractor is driving at low speed, there is no rhythm sound, and when the speed increases, it becomes a messy tooth impact sound, and sometimes the neutral sound is also loud. Mostly, the gears in the transmission are not properly meshed, especially after the overhaul, the newly assembled gears are not suitable for the sounds that are easy to occur. 5 When the engine is running at an idle speed, it makes a rhythmic sound. After the throttle is increased, the sound is more serious and the transmission is vibrated. It is usually caused by the flaking of the tooth surface or the broken tooth of the gear.
Brake pedal reserve stroke and inspection of Ma Yuanjiang Mengxianwen tractor farm vehicle and the brake pedal free travel and working schedule of Mudanjiang Agricultural Machinery Station in Heilongjiang Province are often checked and adjusted, but for the brake pedal reserve stroke inspection, many maintenance workers I feel very strange, because it is rarely mentioned in the previous materials, even in the relevant textbooks. However, the brake pedal's reserve stroke is consciously and unconsciously inspected and adjusted in practice, some of which are The importance of the reserve stroke check adjustment is verified by the cost of life. What is the reserve stroke? We think that the brake pedal is stepped on to the end, and the vehicle preparation stroke, that is, the remaining pedal height after braking. The reserve journey must meet the requirements of the original model, otherwise it will lead to a major safety accident.
The wear of the hinges of the connecting rods in the brake system, especially the increase in the clearance of the brake shoe hub, will increase the brake pedal stroke. As the brake pedal stroke is increased, it is necessary to have enough space for the pedal to go forward and achieve the purpose of braking the vehicle. In the Heilongjiang Province agricultural machinery safety technical inspection project and technical requirements, the reserve stroke requirements for wheeled tractors and wheeled agricultural transport vehicles must be after the pedal full stroke of the vehicle is braked, at this time the distance from the pedal to the floor or the dash panel Storage
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