I. Core Faults of Agricultural Equipment Bearings

Agricultural machinery operates under the most demanding conditions in the global industrial sector. Disc harrows, planters, tillers, balers, and grain conveyors are constantly exposed to soil, debris, fertilizers, pesticides, and moisture. In severely polluted environments, lubricating grease alone cannot provide sufficient protection for the bearings. 

Common failure modes: 

Soil and soil pollution – The bearings of the farming machinery operate in the damp and muddy soil conditions, exposed to soil, sludge and water. Long-term use causes soil to accumulate on the seals, allowing pollutants to invade and accelerating the wear of abrasive particles, eventually causing the bearings to become stuck. 

Water intrusion and corrosion – One of the most common causes of failure for agricultural equipment bearings is water intrusion. The equipment is idle for up to nine months each year. The residual water inside forms "water pit corrosion" oxidation areas, weakening the surface and eventually leading to peeling or flaking. 

Chemical corrosion caused by fertilizers and pesticides – Agricultural chemicals corrode ordinary steel bearings. The corroded shafts and raceways lose their accuracy, accelerate wear and lead to premature failure. 

Lubrication failure - Lack of proper lubrication is the most common cause of bearing failure, accounting for over 40% of the faults. Agricultural bearings are often difficult to access for regular grease injection. Excessive lubrication leads to overheating and seal failure; insufficient lubrication causes rapid wear. 

High-pressure cleaning damage - Agricultural equipment is frequently washed with high-pressure water jets, forcing water to pass through standard seals and enter the bearing chambers. 

Improper installation – One-third of bearing failures are due to fatigue spalling, one-third are caused by poor lubrication, and one-third are due to incorrect installation or the entry of contaminants. 

II. All-Stainless Steel Structure + Factory Pre-Sealed Unit - Maintenance-Free Solution

✅ All-Stainless Steel Bearing Unit - The NMT sealed bearing unit uses stainless steel sleeve bearings, with both the inner and outer rings as well as the rolling elements being corrosion-resistant stainless steel. Carbon steel bearings start to rust within one farming season, while NMT stainless steel bearings remain intact across multiple farming seasons. The native passivation film prevents erosion by fertilizers, pesticides and moisture - no surface coating required. 

✅ Factory pre-lubrication, lifetime sealing – Each NMT Agri-Hub unit is filled with long-life lubricating grease and sealed upon leaving the factory. No field re-lubrication required – Eliminates the risk of contamination from improper lubrication and the cost of manual lubrication. 

✅ Carburized and hardened steel structure - For high-load areas such as the disc harrow blade assembly and the plow handle of the cultivator, NMT uses carburized and hardened steel (equivalent to SAE 52100), achieving the optimal balance between a tough and impact-resistant core and a hard and wear-resistant surface. 

✅ Corrosion-resistant options – For equipment such as fertilization machines and pesticide sprayers that come into contact with chemicals, NMT offers fully stainless steel units and special alloy options, providing stronger corrosion protection. 

✅ Automatic centering capability – The NMT bearing unit with housing can compensate for shaft deflection and installation deviations, reducing premature failure due to misalignment. 

III. Equipment Bearing Solution - Suitable for Every Type of Agricultural Machinery

▸ Sealed Bearing Unit (Agri-Hub) 

The NMT Agri-Hub bearing unit is a fully integrated, sealed, and pre-lubricated component specifically designed for harsh field conditions. It is applied in disc harrows, vertical tillers, cultivators, and planters. The double-row angular contact ball bearings provide high load capacity in a compact size. The factory pre-fills long-life lubricating grease seals - no maintenance is required throughout the season. 

Sleeved bearing (UC series) 

The NMT UC series bearing with housing features a wide inner ring and is equipped with locking screws or eccentric locking sleeves, ensuring reliable shaft installation. It is suitable for scenarios such as grain screw conveyors, conveyors, baling machines, and harvesters that require quick installation and replacement. Two options are available: stainless steel and standard steel. 

Disc耙 bearing 

The disc harrow assembly requires high axial load-bearing capacity and heavy-duty seals. The NMT disc harrow bearings feature a conical roller configuration, specifically designed for the high impact loads during farming operations. Multiple lip seals prevent soil, stones, and debris from entering the bearing chamber. 

Sowing machine bearing 

Each seeding machine uses over 100 bearings - on-site re-lubrication is impractical. NMT offers lifetime sealed deep groove ball bearings, equipped with three layers of lip seals, to prevent the entry of seed coating agents and fine soil particles. Factory pre-lubrication ensures consistent seeding accuracy over thousands of acres of operations. 

Bearing for baler and hay harvester 

The picking up device and feeding mechanism bearings of the baler are subjected to crop residue, baling ropes and heavy impact loads. NMT provides heavy-duty sealed bearings with a full-roller design, achieving maximum load capacity within a limited space. The reinforced cage is designed to withstand the repeated impacts of the baling cycle. 

Grain conveyor and screw conveyor bearings 

Grain dust is highly abrasive. The bearings of the NMT conveyor adopt labyrinth seals. The centrifugal force is utilized to dislodge the dust particles, and the stainless steel housing is used to resist corrosion caused by the moisture in stored grains. 

IV. Three sealing configurations - for different field conditions

▷ Standard dust-proof type (2RS): Double-sided contact rubber seal 

Blocks dry dust, soil and crop residues. Suitable for planters, strip planters and dry field conveyors. 

▷ Heavy-duty anti-silt type (3L three-layer lip seal): Three-layer sealing lip + labyrinth baffle 

The "3L" three-layer lip seal provides excellent protection against dust, dirt and moisture. The three-layer sealed lip forms multiple barriers to prevent harmful particles and liquids from entering. It is specially designed for disc plows, cultivators and wet soil farming equipment. 

▷ Super heavy-duty sealing type (five-layer lip seal + metal shield) 

The most robust seal is available - a five-layer lip design combined with metal plate flanges provides additional strength. Suitable for捆扎机， hay harvesters, and equipment operating in soil， stones， and heavy debris. Factory-sealed， pre-lubricated， maintenance-free throughout the season. 

V. Special Lubrication - Factory Lifetime Sealing

The NMT sealed bearing units are pre-filled with high-quality long-life lubricating grease in the factory, completely eliminating the need for field lubrication. 

Standard lubricating grease: NLGI 2-grade composite lithium-based grease, with an effective temperature range of up to 107°C (225°F). 

High-temperature option: Polyurea grease, suitable for heavy-duty applications with high rotational speed and high temperature. 

Low-temperature option: Lithium-based low-temperature lubricating grease (drop point ≥ 180°C), suitable for operations in cold weather below -20°C. 

Chemical-resistant option: Special anti-corrosion lubricating grease, suitable for fertilizing machines and spraying machines. 

The factory pre-sealed lubrication eliminates the primary cause of bearing failure - improper lubrication - and also eliminates the contamination risks associated with field grease injection. 

VI. Spot reserves + Non-standard customization - Emergency guarantee during the busy farming season

Common agricultural bearing units (UC series, Agri-Hub, disc harrow bearings) have regular inventory - covering more than 80% of the replacement needs for farming, sowing and harvesting equipment. Emergency repairs are dispatched on the same day - minimizing field downtime during critical sowing and harvesting periods. 

Customizable project - Special inner diameter (metric and imperial), customized shaft locking mechanism, stainless steel housing, special sealing material (chemical-resistant FKM/Viton), customized grease filling. 

Quick prototyping with old bearings or drawings – rapid delivery for small-batch urgent orders. Affordable replacement for imported high-end brands (SKF, NTN, TIMKEN, FAG), significantly reducing procurement costs. 

VII. Factory Simulation Test - Field Performance Verified

All products undergo four specialized tests before leaving the factory: 

Soil and soil pollution intrusion test - Simulating wet farming conditions to verify sealing effectiveness 

Humidity and chemical corrosion test - Verify the resistance of stainless steel and seals to the erosion caused by fertilizers, pesticides and moisture 

High-pressure cleaning test - Simulates equipment cleaning to confirm the integrity of the seal under the spray pressure. 

Dimension accuracy and rotational torque detection - Comprehensive inspection of inner diameter, outer diameter, width and starting torque to ensure consistency 

All non-conforming products shall be scrapped. For the same batch with consistent performance, the spare parts management for large farms and agricultural machinery cooperatives will be more convenient. 

VIII. Lifecycle Cost Optimization - Guarding Key Agricultural Window Periods

A one-day equipment downtime during the sowing or harvesting season incurs losses far greater than the purchase price of a set of high-quality bearings. Low-quality bearings fail prematurely due to contamination and corrosion, and multiple replacements are required throughout a farming season. 

The hidden costs of low-priced ordinary bearings: 

Replacement is required every 500 to 1000 hours - much shorter than the equipment's designed lifespan. 

The labor costs for applying grease in the fields and the pollution risks caused by improper lubrication 

The failure of sealing led to the intrusion of moisture - pitting and crevice corrosion damaged the raceways. 

A bearing getting stuck can cause damage to the shaft, the housing and the reducer - resulting in a doubling of the repair cost. 

The NMT sealed agricultural bearing unit can be used stably on field equipment for 2 to 3 farming seasons without requiring field maintenance: 

Maintenance-free design eliminates field grease injection – saves labor costs and eliminates lubrication-related malfunctions. 

The factory sealing unit prevents contamination from entering – no dust, dirt or moisture can enter the bearing chamber – and the lubricating grease remains clean. 

Stainless steel is resistant to corrosion from fertilizers and pesticides – bearings maintain accuracy across multiple farming seasons. 

Vibration reduction protection for supporting components - extends the service life of shafts, housings and transmission system parts. 

Predictable replacement plan – The consistency of performance enables planned maintenance to be scheduled during off-seasons, rather than emergency repairs during peak seasons. 

For large farms, agricultural machinery cooperatives and cross-regional operation harvesting teams, the comprehensive holding cost of the NMT sealed bearing unit is significantly lower - what is saved is not the difference in bearing prices, but the operational certainty of continuous operation during critical farming periods without downtime.