During planting, in the field, important challenge of two wheels that carry a certain load of the machine is to transfer the movement created by their turnings to seed and fertilizer shafts by means of chain and gear system. As for spring loaded coulter type of models, DEPTH SETTING WICK on these two wheels provides PLANTING DEPTH as well. For spring loaded coulter type of models, height difference between wheels and coulter ends is formed by means of turning setting wick right or left. More the wheels are lifted according to coulter ends, planting depth increases. This difference of height is reflected as depth to an extent varying by the soil structure. Therefore, you shouldn’t assume the difference you see on the concrete floor between the wheel and coulter ends as a certain depth of planting, and should control depth of seed on the field and make FINE ADJUSTMENT by setting wick.
As you see on the setting of seed and fertilizer planting, external diameter of the wheel has a direct influence on determination of planting quantity. Take this situation into consideration when you change the frazzled wheels. On the other hand, you should check tire pressures and tire surfaces frequently due to the fact that wheels cannot perform their duties, as requested, as the surfaces of frazzled wheels are worn out.