How to Adjust and Maintain the John Deere 2625 Disc Harrow

The disc harrow is an "old friend" among tillage machines, mainly used for breaking up and leveling soil after plowing, and can also be used for stubble clearing and shallow cultivation to control weeds. The John Deere 2625 disc harrow is a medium-to-large trailed disc harrow, commonly seen in areas with larger fields such as the Northeast and Northwest, working with high-horsepower tractors for high tillage efficiency, and many large growers and agricultural machinery cooperatives use it. Below, we discuss the principles, use and maintenance of this type of disc harrow based on the issues operators care about.

How the disc harrow works

The working parts of a disc harrow are spherical discs with cutting edges. During operation, the discs cut into the soil at an angle, and the rotating edges cut and break up the soil, while also chopping, turning and mixing the soil furrows, making the surface soil fine and level. Compared with the moldboard plow, the disc harrow has weaker soil-turning and covering ability, but it breaks soil well and has strong passability, making it especially suitable for shallow harrowing and stubble clearing after straw and residue are returned to the field, as well as for loosening soil and preserving moisture before sowing. Offset disc harrows like the 2625 have two sets of discs arranged in a staggered front-and-rear pattern, leaving no missed harrow strips on the surface after harrowing, for better levelness.

Several key adjustment points during use

First, harrow depth adjustment is generally controlled by changing the disc gang angle and adding or reducing counterweight: when the soil is dry and hard, the angle can be appropriately increased and counterweight added; when the soil is wet and soft, the angle should be reduced to prevent clay from sticking and clogging the harrow. Second, operating speed: too fast results in poor soil breaking and unstable harrow depth, while too slow means low efficiency; simply drive at a constant speed in the tractor's normal working gear. Third, connection and leveling adjustment: the height of the hitch point must be set properly to ensure the harrow frame is level left to right and consistent front to back, otherwise one side will harrow deeper and the other shallower. Fourth, slow down and lift the disc gangs when turning at the headland; sharp turns during operation are strictly prohibited to avoid damaging the discs and bearings.

Maintenance and purchasing tips

After each shift, clean mud and tangled grass from the discs and scraper plates, check the tightness of bolts at all points and the temperature rise of the bearings, and regularly add grease. After the working season ends, the disc edges should be coated with oil to prevent rust, and the whole machine should preferably be stored indoors to avoid sun and rain. Worn and dull discs will significantly affect soil-breaking quality and should be repaired or replaced in time. When purchasing this type of medium-to-large disc harrow, the scope and amount of agricultural machinery purchase subsidies vary by region; the specific details are subject to the subsidy catalog and standards published by the local agricultural machinery authorities. It is also recommended to choose a dealership channel with proper after-sales service, as parts supply and warranty service are better guaranteed.

Overall, whether a disc harrow works well depends thirty percent on the machine and seventy percent on adjustment and maintenance. For a model like the John Deere 2625, as long as it is operated according to specifications and maintained diligently, both tillage quality and working efficiency can be satisfactory.