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Transmission Faults and Repair of Main Parts
1. Unable to hang on the block Common causes The transmission fork is loose or deformed; the positioning groove and the positioning pin on the shift shaft are worn, the surface has irregular steps, and it gets stuck during the shifting; the gearbox is deformed; the pinning linkage bar is loose or loose Improper adjustment; lock the shaft to limit the looseness of the screw and so on. Of course, when the clutch is not completely separated and the small brake malfunctions, it can also cause a failure. 2. The common cause of automatic shifting is the excessive wear of the face gear gear, which causes the gear meshing surface to be too short, and the gear body wears a conical shape to generate axial force, resulting in a disengagement; the positioning pin breaks and the positioning ball fails due to vibration. Disengagement; shift fork and gear fork groove wear, fork loose fork, causing the sliding gear to produce axial turbulence resulting in unblocking. 3. Common causes of misalignment Positioning pins, positioning steel ball spring failure or break; gear head and its excessive wear with shift shaft; excessive wear of positioning guides. 4. In the use of noise in gearbox replacement or repair of the gear side clearance is too small, or gear wear in long-term work to make the side clearance is too large, will be due to poor meshing noise. In addition, the wear of rolling bearings or spacers and the lack of lubricant in the gearbox can cause abnormal noise in the gearbox during operation. Transmission Gear Repair 1. The commutation gear is worn on one side, and when the structure is allowed, it can be changed or turned over 180 degrees. For example, the Dongfang Hong-75 tractor's final drive size reduction gear has a symmetrical left and right structure. Once the gear is worn on one side, it can be used as a right-to-back pair. 2. Inlay ring gear tower gear is a combination of several gears, the degree of wear of each gear is not the same. If only the gear teeth of the individual gears wear out of tolerance, the method of repairing the gear rings is repaired. The method is to first anneal the specially repaired gears, remove all the gear teeth from the car, and make a circle press-fitted to the gear teeth of the car. To prevent the new gear ring from loosening, weld the gears circumferentially along the ring gear and gear joints. Welding, or drilling along the circumference after the distribution and stability to be fixed. 3. The inserting method can be used for partial repair of gears with small loads and low rotational speed after being individually knocked out. The method is to etch or mill the dovetail groove on the machine tool root, press the new tooth embryo with the same groove type into a certain amount of interference, and weld it to work. 4. Overlay welding method When the gear wheel's individual teeth collapse, or tooth surface, tooth wear exceeds the limit, according to the degree of damage, carry out welding repair. Before welding, use grease or hot alkaline water to clean grease stains, rust, and rust on the surface of gears to reveal metallic luster. The welding electrode used for welding should be the same or similar to the gear material. After the surfacing is repaired and machined to restore the tooth profile, the repaired gear must be tempered to eliminate internal stresses. Transmission Case Repairs 1. Repair of the housing bore When the bore of the housing is excessively worn, it can be repaired using a boring insert. Insert material can choose HT20-40 gray cast iron. When inserting, first set the outer diameter size of the sleeve, press into the bearing seat hole, then set the inner diameter of the standard size. After boring, the cylindricity deviation of each shaft hole should not exceed 0.03mm; the common axis of the coaxial two holes and the verticality deviation of the processed surface should not be greater than 0.05mm in the length of 100mm; the holes in the different shafts The misalignment of the axis parallelism should be no more than 0.06mm over the entire length. 2. Repair of cracks and perforations in the gearbox housing Cracks and perforations in the housing can be repaired by patching, welding or gluing. When repairing the patch, several holes with a diameter of 4.9mm can be drilled around the crack or perforation, tapping the thread of M6, finding a piece of iron about 3mm thick, and drilling a hole with a diameter of 6.5mm in the corresponding position of the iron plate. After inserting the asbestos pad between the iron plate and the side wall, tighten the iron plate and the shell with the M61.0 screw. When welding, a hole with a diameter of 3.5 mm must be drilled at both ends of the crack. After the V-shaped groove is opened along the crack, cold welding is performed using a copper-iron electrode or a cast iron electrode. When repairing, it must also stop the hole, open the V-shaped groove, and then fill with epoxy resin.