The newly purchased small corn harvester, or the small corn harvester after maintenance, the mating surface of each moving part is not flat and smooth, the contact area between the moving surfaces is small, and the unit area load is large. The operation will cause severe wear of the parts, and even the surface of the parts will be scratched and strained, and the working ability will be lost. In addition, most of the power transmission during the harvester's work is completed by the belt. If it is not put into operation after trial operation, that is, when it is put into operation, the corresponding resistance of the power transmission will increase, and it will be easier to cause the belt to elongate and slip and damage the working surface. Cause failure. Therefore, new harvesters or after harvesting must be run in trial run. Let me share with you the running-in method of the small corn harvester's test phase summarized by me:
The running-in sequence of the corn harvester should be the engine part → walking part → cutting part → threshing, separation, cleaning part → unloading part.
During the engine test run, the cold and hot running break-in should be determined according to the maintenance content. If the bearing bush, piston and piston ring are replaced, they should be cold ground first and then hot ground. When running in the test run, you should always pay attention to whether the oil pressure gauge, oil temperature gauge and water temperature gauge are kept within the specified values; listen to the engine for abnormal noise. If it is found that the oil pressure is low, oil leakage, water seepage and abnormal sound, it should be eliminated in time, and it should not be forced to test run with illness. Its trial running-in time: cold grinding 6h; hot grinding, low speed (600-800r / min) 15min, medium speed (1100-1200r / min) 10min (no medium speed when the water temperature does not reach 40 ℃), high speed (rated speed) 5min (No full speed is allowed when the water temperature does not reach 50 ℃).
After the engine is running normally, you can perform the test run in the order of 1st gear to 2nd gear to 3rd gear and then reverse gear. During the trial run of the corn combine, you should turn left and right, check the steering mechanism, Whether the brake is sensitive and reliable, pay attention to the operation of the engine gearbox and power transmission, check whether the clutch is stable and reliable, whether it is completely separated, whether the shift is light, whether the interlocking mechanism is reliable, and whether the instrument is normal. If any problem is found during the trial operation, stop the machine immediately and remove it. The running-in time for trial operation is 1st gear 30min, 2nd gear 30min, 3rd gear 20min, and reverse gear 10min.
After the running-in of the engine and the running test run is normal, the running-in of the working mechanism such as cutting, threshing, separation, and grain unloading can be performed. At this time, the work handle can be connected, and the running speed can be divided into small throttle, middle throttle, and large throttle for trial operation. Partial trial operation is performed before full trial operation. During the trial operation, pay attention to whether the operation of each running and moving part is normal, and listen for noise. Test the working conditions of the hydraulic components and observe whether they are sensitive, reliable, and freely moving, and whether there are oil leakage and oil leakage. Check the reliability and sensitivity of the monitoring instrument. If a problem is found, test run in after running out. The test run-in time is 3h for small throttle, 2h for medium throttle, and 1h for large throttle.
Immediately after the test run, check whether the fasteners are loose, whether the bearings and bushes are hot, and that the belts and chains are tight and worn. Discharge the lubricating oil in the engine oil pan, gearbox, reduction gearbox and hydraulic oil in the hydraulic tank while it is hot, and completely remove the filter. Before the corn harvester is officially operated, a representative field must be selected for trial cutting and running. The trial cutting and running are required to be carried out first, and after a period of trial cutting and running, a full trial cutting and running is required.