Combine harvesters will inevitably encounter some mechanical failures, but as long as the operators grasp the skills to troubleshoot, some can resume harvesting in a short period of time. Straw squash for many reasons: wheat is too mature, coupled with straw is too dry; threshing parts watts open large screen. Exclusion skills: 1 reduce the gap between the threshing tile screen, the screen opening to maintain no more than 2/3, under the screen opening is generally not less than 1/3. 2 The plane was quickly raised to the ground and the header was quickly raised. The large throttle sent the remaining wheat from the trough. The reason why the head of the ear is not removed is due to the fact that there are many heads of wheat in the ear; the threshing gap between the stalk and the concave of the threshing part is too large and the rotation speed is low. Exclusion techniques: 1 Control the width of the cut width of the plot, control it within 2/3; 2 Adjust the threshing machine threshing gap, reduce the drum speed, increase the concave gap. Worn out parts should be replaced promptly. 3 Tighten the power machine to interlock the threshing components. The main reasons why the reel hits the grain are: the reel speed is too high, the reel position is too high to hit the head, or the reel position is too far ahead, increasing the number of hits in the ears. Exclusion tips: Reduce the reel speed or height appropriately, and move the reel wheel after appropriate. Difficulties in automatic feeding: The reel position is too far from the feeder to feed the auger, the distance between the agitator blade and the bottom plate in the middle section is too large, the feed chain does not match the telescoping tip, and the crop is lodging or wet. Exclusion tips: 1 In the premise that the spring teeth do not touch the cutter, the reel should be moved as far as possible. 2 Repair the header to feed the dragon blades so that the height of the blades from the floor is not more than 10mm. 3 Keep the feed chain at a distance of 10-15 cm from the telescopic tip. 4 The spring length of the auger's safety clutch to be fed to the header is to be suitable. When the feed resistance is too large, it can be separated in time. Cutting knife plug causes: too much weeds in the field, cutting lice is too low. Exclusion Tips: 1 Increase the cut amount appropriately to eliminate it. 2 If it is embedded in hard objects such as stones or steel wires, stop and extinguish the engine and remove the contents. 3 Adjust the clearance between the moving blade and the fixed blade to 1-1.5 mm, and find that the bolt and the tool bar are deformed and straightened or replaced. The reason for the blockage of the trough is that the tension of the conveyor belt is not enough or there is a phenomenon of side running; the debris of the trough is more; the stem of the grain is wet. Excluding skills: 1 clean up the blockage, tighten the belt; 2 when the belt is worn to ensure that the transmission of power is not enough, it should be promptly replaced; 3 such as wheat straw damp, reduce the breadth of width or until the wheat straw dry after harvest. Threshing roller jamming causes: the belt is too loose or unevenly fed; crop stems are wet. Exclusion techniques: 1 Tighten the conveyor belt and control the feed amount of the header. 2 Select mature dry crops or increase cuttings. 3 When the job starts, it is forbidden to bang the throttle to control the speed.