Double-row harrow with double spring on Grand Max Agro cultivators : operating modes and applications

Double-row harrow with double spring Grand Max Agro — precise adaptation to any operating conditions

Grand Max Agro cultivators are equipped with a double-row harrow featuring a rigid spring tine 10×400 mm, manufactured from heat-treated grade 70 steel. The harrow design is engineered to improve the quality of pre-sowing soil cultivation, level the field surface, and effectively remove plant residues.
The harrow operates in three working modes: smooth, rigid, and fixed, allowing precise adjustment of the implement to soil type, season, and specific agronomic tasks.

Harrow operating modes and application recommendations

Smooth mode

Operating principle:
The spring tine works at a small angle of attack (15–20°), creating a gentle and elastic impact on the soil.

Recommended for:

• light and medium soils;

• dry or moderately moist conditions;

• spring pre-sowing cultivation;

• final field leveling.

Effect:

• accurate surface leveling;

• removal of plant residues without damaging soil structure;

• minimal load on the frame and working components;

• formation of an even seedbed.

Rigid mode

Operating principle:
The spring operates at an increased angle of attack (25–30°), providing a more aggressive impact on the topsoil layer.

Recommended for:

• dense, heavy, and wet soils;

• fields with a high amount of crop residues;

• summer–autumn cultivation period;

• mechanical weed control.

Effect:

• intensive surface leveling;

• active cutting and removal of weeds;

• breakdown of clods and compacted areas;

• increased efficiency of full-width cultivation.

Fixed mode

Operating principle:
The spring tine is fixed at a constant angle of attack (approximately 20–22°) with an unchanged working depth.

Recommended for:

• precise pre-sowing preparation;

• uniform seedbed formation;

• operation on structurally uniform soils;

• situations where repeatable results are required.

Effect:

• stable working depth across the entire working width;

• uniform soil structure;

• precise control of agronomic parameters.

Advantages of the double spring

The use of a double spring in the harrow design provides several key advantages:

• even load distribution on the tine;

• increased resistance to deformation and wear;

• stable operation at high working speeds;

• reduced vibration and impact loads on the frame;

• improved performance on heterogeneous soils.

Thanks to the double spring, the harrow follows the field contour more accurately, does not clog with plant residues, and maintains the set working parameters even under difficult conditions.

Application on Grand Max Agro cultivators

The double-row harrow with double spring is used on:

• mounted cultivators: 2.6 m · 3.0 m · 3.5 m · 4.0 m

• trailed cultivators: 4.0 m · 5.0 m · 6.0 m

This standardization simplifies maintenance, increases reliability, and allows the same working components to be used across different models.

Seasonal operating recommendations

• Spring: smooth or fixed mode — for pre-sowing preparation and leveling.

• Summer: rigid mode — for full-width cultivation and weed control.

• Autumn: rigid or fixed mode — for leveling after primary tillage.

Grand Max Agro — an engineering approach to high-quality soil cultivation

Grand Max Agro is an agricultural machinery manufacturer that designs cultivators based on real operating conditions. Modular construction, wear-resistant materials, and well-engineered adjustment of working components ensure high productivity, long service life, and consistent field performance.