Judgment and Elimination of Gearing of Dongfanghong-75 Tractor Gear

Dongfanghong-75 Tractor's timing gear chamber gear sometimes appears gear failure, at the same time will cause camshaft and valve lifter bending deformation, so that the valve rocker arm and rocker shaft breakage damage, in serious cases caused by burning tile shaft accident . This phenomenon often occurs in older vehicles and often uses old hydraulic vehicles. First, determine the fault of teeth 1. Teething phenomenon After the timing gears hit the teeth, there are often chaotic timings, irregular fuel and air supply, and unstable oil pump operation. The valve chamber emits abnormal noise, the engine power drops, and even the engine automatically shuts off. The exhaust pipe emits black smoke, and when it is seriously mixed with white smoke, the engine oil pressure suddenly rises and falls, causing the burning tile to hold the shaft. 2. The judgment method of gear teeth will cause the engine to stall. If the clearance between the intake and exhaust valves is basically within the standard range, it means that the camshaft gear is not causing the fault. If the gap between the intake and exhaust valves changes greatly, it indicates that the valve lifter has been deformed. , Or rocker deformation, break, you can conclude that gear teeth have occurred. You can also remove the valve lifter and rocker to see if it deforms. At the same time, observe whether the oil pressure has obvious fluctuations, and determine whether the oil pump gear or the intermediate wheel hits the teeth. Second, cause the cause of tooth failure 1. The cam uranium neck gap is too large. When the camshaft wear between the journal and the bush is more than 0.50 mm, especially when the front bearing clearance becomes larger, the gear is shifted to the opposite side of the driving direction during operation, destroying the original correctness. The meshing position makes the tooth surface wear more severe, and the tooth tip is forced to increase the surface tooth. 2. Excessive Shaft Excursion Between Camshafts Camshaft gears use helical gears for smooth transmission. Uranium forces are generated in the transmission. When the bearing bush shoulders and bores are worn out, the thrust adjustment screws are not adjusted in time to maintain the normal shaft. To the gap (0.25 mm), there is a large axial turbulence and oscillation, which causes the intermediate wheel and the oil pump drive gear to swing and change its position. 3. Improper maintenance When repairing and installing the camshaft bushing, the bushing oil hole is not aligned with the oil hole on the upper part of the body, the oil cannot fully lubricate the bearing, wear is accelerated, the bearing clearance increases rapidly, and it is easy to lose the correct position in the gear meshing. During teething or repairs, inspections and repairs of timing gear chambers are neglected, or teeth that do not meet the technical specifications in the repair and allow gaps to exceed the limit in the early stage. 4. Improper use of a tractor long-term use of the hydraulic system, due to the impact of the hydraulic pump load so that the impact of the oil pump drive gear caused by the bearing wear increased, the gap becomes larger, the gear working environment deteriorated and hit the teeth. 2 The gear is used for too long, the wear becomes thin, and the strength is reduced and the teeth are hit. Third, troubleshooting methods 1. Inspection and replacement of defective gears All gears in the timing gear chamber were inspected and it was found that gears with flank flaking, erosion, fracture, and significant thinning had to be replaced with new ones. 2. Check the crankshaft camshaft of the main parts of the valve mechanism shall not exceed 0.1-0.2 mm, the straightness of the tappet shall not be greater than 0.1-0.2 mm, if the deformation of the two is too bad, can be straightened by the cold pressure method. The corrected swing is not greater than 0.025 mm or a new one is replaced. Rocker and rocker shafts must not be deformed or cracked, otherwise they must be replaced with new ones. 3. Check the clearance between each shaft and the bush The clearance of the bearings of each part of the timing gear chamber should be within the technical specifications, and the overhaul must be repaired. If the bearing clearance of the camshaft exceeds 0.25 mm and the axial clearance exceeds 0.25 mm, the neck clearance of the front and rear bearings of the oil pump driving gear is greater than 0.2 mm, and the gap between the transmission intermediate gear and the bushing is greater than 0.2 mm, and both are to be repaired. 4. Reasonable operation of the hydraulic mechanism in order to prevent the occurrence of gear failure, when operating the hydraulic mechanism, to avoid the impact, the equipment should be slowly joined when lifting, in particular, can not overload the lifting equipment, while minimizing the use of hydraulic mechanism, while reducing the load of the oil pump, Reduce gear teething or damage. 5. Strengthen the inspection and maintenance should change the technical maintenance of the despising timing gear room, especially the old locomotives that often use the hydraulic mechanism. In the size repair of tractors, the timing state of the components of the timing gear chamber must be carefully repaired to achieve the standard coordination.

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