Working Principle and Key Points for Selecting and Using a Full-Feed Wheeled Grain Combine Harvester
The wheeled full-feed grain combine harvester is the most common "workhorse model" during wheat and rice harvest seasons, and the Dongfanghong 4LZ-2.5 is one of the representatives of this type. In the model designation, "4LZ" is the industry's general code for self-propelled grain combine harvesters, and the number after it usually represents the feed rate class; the larger the number, the more crop it can "swallow" per unit of time. For specific configuration parameters, please refer to the manufacturer's accompanying materials and official announcements.
What does full-feed mean
Combine harvesters are divided into two types by feeding method: full-feed and half-feed. In full-feed, the crop cut by the header is sent whole, stalks and ears together, into the threshing cylinder, and after threshing the stalks are crushed and discharged from the machine. Its advantages are a relatively simple structure, high working efficiency, low breakdown rate, good adaptability to lodged crops, and a price more affordable than half-feed models. The wheeled chassis travels fast on roads and makes it convenient to move between fields, making it suitable for flatland areas with contiguous fields and good road conditions; if you often work in wet, muddy paddy fields, you should consider a crawler-type model.
How a combine harvester works
The whole process can be simply summarised as follows: the header first lifts and cuts the crop, which is sent through the conveyor trough into the threshing cylinder; after the grains are threshed off the ears, they are separated through the concave sieve, and then the cleaning fan and sieves blow away the glumes and broken straw, while the clean grain is sent by the auger into the grain tank; the stalks are discharged from the machine to be laid in swaths or chopped and returned to the field. During operation, the stubble height, reel speed and threshing clearance should be adjusted promptly according to crop variety, moisture and maturity. First do a trial harvest on a small area, "adjust and test", and then start harvesting on a large scale, so that both grain loss and grain breakage are reduced.
Reminders for selection and use
When selecting, first check whether the feed rate matches the scale of your fields; for small fields there is no need to blindly pursue large models. Then ask clearly about local after-sales service outlets and the supply of wear parts; during the busy farming season time is tight, and a machine "down" for a day causes a big loss. Before purchasing, you can consult the local agricultural machinery authorities to learn about that year's agricultural machinery purchase subsidy policy; the subsidy scope and standards vary from place to place, and the officially published information shall prevail. During use, note the following: strictly follow the operating procedures, and always stop the machine and shut off the engine before clearing blockages in the cylinder or conveyor trough; after each day's work, clean dust from the radiator grille and sieve surface; before seasonal storage, drain the fuel and cooling water, lubricate the bearings at all points, and prop up the tyres to prevent ageing, so that the next year's harvest can get off to a flying start.