Reasons for Uneven Farmland Working by Rotary Tiller

Farmland undulates like waves, not only affecting the subsequent sowing and emergence rate, but also making the hands of agricultural machinery feel uneasy. In fact, uneven rotary tillage is mostly caused by three common problems: blunt blades, crooked legs, and rough hands, rather than machine failure. Don't rush to overhaul, follow the steps below to quickly regain the flatness.

I. Quickly identify the three core lesions:

The most direct reasons for uneven ground after rotary tiller operation are usually concentrated in the following three aspects. You can quickly self check by comparing the on-site situation:

(1) Abnormal blade group status: This is the most common reason. If certain blades are severely worn and shortened, or if a few blades are missing, a "cutting blind spot" will form during rotation, resulting in excessive soil accumulation in that area. In addition, inconsistent or disorderly installation angles of blades can also cause uneven depth of soil penetration.

(2) Suspension system horizontal imbalance: If the three-point suspension of the tractor is not leveled, the rotary tiller will tilt during operation. Left high and right low, or front high and back low, will inevitably result in one side of the cultivated land being deep and the other side being shallow, and the visible ground level is inclined or wavy.

(3)Unstable depth control: Many farmers overlook the stability of depth limiting wheels (if any) or hydraulic lifting. If the tractor's speed fluctuates rapidly, or if there is settlement in the hydraulic system, the depth of the rotary tiller entering the soil will fluctuate with the speed of the vehicle. When the vehicle is fast, it cuts shallowly, and when it is slow, it cuts deeper, resulting in naturally uneven terrain.

II. Three step practical investigation and adjustment

After finding the suspected cause, do not blindly guess. Adjust according to the following order, with clear verification criteria for each step:

Step 1: Stop the machine and check the blade assembly

Raise the rotary tiller, clean the soil, and carefully inspect all blades on the blade shaft. Criterion: The length difference of blades on the same blade shaft should be controlled within a reasonable range and there should be no missing parts. If it is found that a certain blade is significantly shorter than others by more than 5 centimeters or has broken teeth, it must be replaced with new blades of the same specification in groups. It is important to avoid replacing only one blade, which may result in uneven force distribution.

Step 2: Calibrate the three-point suspension level

Return to the flat ground and lower the rotary tiller to its normal operating depth. Criterion: Use a spirit level to measure the height on both sides of the rotary tiller frame, with a left-right error of less than 1 centimeter; Observe the position of the gearbox and keep it horizontal in front and behind. If tilting is found, correct it by adjusting the length of the lower pull rod of the three-point suspension of the tractor - the pull rod will be shortened if it is long, and extended if it is short, until the frame is absolutely horizontal.

Step 3: Stabilize the operating speed and hydraulic system

During formal operations, the driver should maintain a constant throttle to avoid frequent gear shifts or sudden changes in speed. Criterion: Drive in a straight line at a moderate speed and observe whether the smoothness transition is natural when turning on the ground. If it is a hydraulic lifting type, ensure that the lifting handle is not randomly moved during operation, and rely on its own weight and the ground wheel (if any) to passively eat soil, which can ensure depth consistency.

III. Guidelines for avoiding pitfalls and long-term maintenance

Many users think that adjusting once can manage the entire year, but in fact, small daily oversights can quickly damage the flatness. There are two key points that are easily overlooked here:

Firstly, it is strictly prohibited to forcefully dig deep in hard or rocky fields. When encountering hard soil blocks or dark stones, the resistance of the rotary tiller increases dramatically, causing local rebound and instantly damaging the already cultivated flat surface. When encountering such terrain, shallow tillage and fragmentation should be carried out first, followed by deep tillage.

Secondly, regularly check the tightness of bearings and chains. The rotary tiller vibrates greatly, and after long-term operation, the clearance between the blade shaft bearings increases or the universal joint chain becomes loose, which can cause asynchronous power transmission, resulting in a "one stop, one stop" farming feeling and causing surface ripples. It is recommended to add butter to the rotating parts and tighten the key connecting bolts every 50 hours of homework.

In general, it is enough to remember the phrase 'check if the blades are aligned first, then adjust the suspension to be even, and finally stabilize the speed of the vehicle'. Regular maintenance can reduce 80% of flatness problems.