How to identify the quality of agricultural machinery spare parts
Visual identification method
Visual appraisals can identify wear and tear on the surface of the part, as well as material deterioration on the surface of the part. Such as cylinder block, cylinder head cracks, gear and flow bearing surface fatigue off, fuel injector, exhaust valve serious burn after annealing blue or pitting, clutch and brake friction material wear and burn, gear pair of rodents, between the piston and cylinder sleeve leakage degree.
Auditory identification method
Auditory identification can be used to gently knock the metal parts of the tractor, harvester inspection parts, from the sound to determine whether there is a crack in the interior, whether the connection is close, generally close and intact parts between the hair crisp, defective hair turbidity dumb. With this method, the crack of crankshaft and side bar can be identified, the combination of bearing alloy and the body, whether the rivet connection is firm, etc. In addition, the same sound from the running gear group can also be roughly judged the meshing situation.
Tactile identification method
Tactile identification can be used to shake the hand, according to the feeling to judge the size of the gap, do not need to use a measuring tool measurement. Such as tractor, harvesters, implements, valve rod and valve conduit clearance, radial and axial clearance of flow bearing, etc.
What problems should we pay attention to when replacing agricultural machinery accessories
Pay attention to the quality of the parts when purchasing agricultural machinery accessories, identify fake and inferior products; Carefully check whether the parts have rust spots, cracks, deformation and other defects, and whether the surface size meets the requirements. The antirust coating on the surface of the new parts of agricultural machinery should be clean before assembly, especially the precision parts should be paid more attention to so as not to cause accidents. Deformed products are not universal, some diesel engine plants produce the same model of deformed products, its parts are not universal.
Replacement of farm machinery parts need to be replaced in pairs. For example, when replacing the gear, do not only replace one of the more serious wear; When replacing the double row sleeve roller chain in the transmission box, the main and driven sprocket should also be replaced in pairs; When replacing the cylinder liner, replace the piston and piston ring at the same time. Standard and large parts of the same model are not common. Manufacturers will produce large size parts for users to choose when repairing, therefore, you must decide whether to buy the parts are standard parts or large parts. If the standard parts, the journal can only be matched with the standard crankshaft tile, otherwise, the processing amount of scraping bearing is very large, it is a waste of time, and can not ensure the repair quality, but also greatly reduce the service life.
When replacing a new part, make the new part exactly the same model as the old one. When some operators replace the new nozzle, they do not pay attention to the original nozzle specifications and models, and often buy the wrong needle valve couple parts. If it is light, it is difficult to start, and if it is heavy, the nozzle is stuck. Note the orientation during installation. Some parts are directional. If you do not pay attention to them, they will cause startup difficulties after installation and even damage the parts.
