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"Three summers" approached. This period was a period of time when farm machinery operators were very busy. There were special circumstances in the operation of farm machinery that required special treatment. They could not be generalized. The following points are notes on the operation of agricultural machinery under special circumstances for reference. First, the operation of lodging crops should appropriately reduce the forward speed of the unit; correctly select the harvesting direction of the unit, and the direction of advancement of the unit should be opposite to the direction of lodging of the crop (referred to as undercut), or an angle of about 45 degrees with the lodging crop (called Side cut); appropriate adjustment of the reel forward and downward to ensure smooth cutting and normal cutting. Second, the operation of low crops should be adjusted and modified appropriately for the headers and reelers. The height of the headers should be kept at a height of 15 cm and the cutting knife should not eat soil. If the cutting is too low, the cutting knife will eat The soil will accelerate knife wear, chipping and damage, adjust the reel down and back properly for normal harvesting; increase the unit forward speed to ensure normal threshing feed; follow the direction of the sowing line for harvesting, It can reduce the strong vibration of the unit caused by the increase of the forward speed, and it can also reduce the harvesting loss. 3. Operation of over-dried and over-ripened crops. Add canvas strips on the wood-turning wheel pressure plate to increase the buffering effect of the reeling wheel in the reeling and reduce the loss of grain; reduce the height of the reeling wheel so that the reeling wheel will not hit. Hit the head of the crop to reduce grain loss; lower the reel speed to reduce the number of hits on the cutting crop. Fourth, the operation under windy conditions At this time, the unit should not run in the wind direction to prevent the unit from working properly; the air inlet on the side of the grain clearing organization should be adjusted smaller, and the air inlet on the leeward surface should be increased in size in order to reduce the loss of cleaning grain blowing. And improve the quality of food. 5. When the harvesting machine is operating at a low level in the wet field, the harvester driving device shall be converted into a crawler type or half-track type so that crops can be harvested in time. When the depth of mud feet is large, the width of the ground wheel of the unit is increased to enhance anti-skid ability. And expand the grounding area as much as possible to prevent the machine from sagging. Sixth, slope operation as far as possible to avoid cross-slope driving operations; long-hill uphill harvest, should be raised after the sieve, use a larger screen hole, the inlet opening should be reduced in order to reduce food losses; short distance uphill harvest In the case of a long distance cutting downhill, the back of the sieve should be lowered.