Descrição
1. Brazilian Mato Grosso Agricultural Gearbox Technical Specifications
| Parameter | Value |
|---|---|
| Max. output torque | 94.5 daNm |
| Contains oil | No |
| Max. oil capacity | 1.1 l |
| Max. oil change interval | 500 h |
| Oil SAE viscosity grade | 80W-90 |
| Housing material | Cast iron GG25 |
| Peso | 19 kg |
| Gear arrangement Reducing | 3 – 4 |
| Input shaft Reducing | Z |
| Input power KW / HP Reducing | 18.4 / 25 kW/HP |
| Ratio Increasing | 1:3 |
| Ratio Reducing | 3 : 1 |
| Shaft X | 150 (A) |
| Shaft Z | 1 3/8″ (6) (B) |

2. Why the EP-Post Hole Diggers Gearboxes – Replacement of Comer Code T-304C is Your Reliable Partner in the Field?
When it comes to ensuring consistent performance in the field, the EP-Post Hole Diggers Gearbox – Replacement of Comer Code T-304C stands as a reliable, durable, and highly efficient solution for your agricultural equipment. Here’s why it should be your go-to choice:
-
Unmatched Durability:
Built to withstand the harshest agricultural environments, the EP gearbox features top-tier materials and construction. Whether it’s dry, muddy, or rocky terrain, this gearbox delivers long-lasting performance, reducing downtime and maintenance costs. -
High Performance and Efficiency:
Designed with precision, the EP-Post Hole Digger Gearbox optimizes the power transfer from your equipment, making post-hole digging faster and more efficient. Expect smoother operations with less fuel consumption and reduced strain on your equipment. -
Easy Replacement with Comer Code T-304C:
The EP gearbox is a direct replacement for the Comer Code T-304C, making it a perfect fit for various post-hole digger models. Its compatibility ensures a hassle-free installation without the need for additional modifications, allowing you to get back to work quickly. -
Cost-Effective Solution:
Investing in the EP gearbox provides you with a high-performance, long-lasting solution that enhances your equipment’s overall lifespan. Its durability and efficiency will pay off in the long term, minimizing the need for costly repairs and replacements. -
Maintenance Made Easy:
With its straightforward design, the EP gearbox simplifies maintenance. Regular upkeep is quick and easy, ensuring that your post-hole digger remains operational with minimal effort. -
Ideal for a Wide Range of Applications:
Whether you’re planting trees, setting up fences, or preparing for construction, the EP-Post Hole Digger Gearbox is versatile enough to handle a variety of tasks, making it a valuable tool for any agricultural operation.
3. Engineering Excellence: Redefining the Comer T-304C Replacement
The agricultural landscape demands machinery that can withstand rigorous operational cycles, particularly when tasked with earth-drilling operations in compacted soil structures. The EP-Post Hole Diggers Gearbox, meticulously engineered as a direct dimensional and functional replacement for the Comer Code T-304C, represents the pinnacle of power transmission technology. Unlike generic aftermarket components, this gearbox is constructed with a profound understanding of torque management and load distribution. The core housing is cast from high-grade ductile iron, specifically chosen to absorb the high-frequency vibrations generated when the auger bit encounters subterranean obstructions like rocks or tree roots. Internally, the gear set features precision-forged alloy steel, subjected to advanced carburizing and quenching heat treatments. This process creates a hardened wear-resistant surface layer while maintaining a ductile core, effectively preventing gear tooth fracture under sudden shock loads. This level of metallurgical sophistication is essential for ensuring longevity, reducing the total cost of ownership for farmers and contractors who rely on consistent equipment performance. By adhering to strict ISO manufacturing tolerances, we ensure that every unit delivers seamless integration with existing implements, requiring no modifications for installation. This gearbox is not merely a spare part; it is a comprehensive upgrade designed to enhance the reliability of post hole diggers in the most demanding environments.
Furthermore, the design philosophy behind this replacement unit prioritizes thermal efficiency and lubrication dynamics. Agricultural gearboxes often operate in continuous cycles, leading to significant heat buildup that can degrade oil viscosity and lead to premature bearing failure. Our EP-T304C replacement model incorporates an optimized internal oil flow channel design that ensures critical components, such as the tapered roller bearings and the gear mesh points, receive constant lubrication even at steep operating angles. This is particularly crucial for post hole diggers, which frequently operate on uneven terrain or slopes. The seal system has also been upgraded to a multi-lip design, providing a hermetic barrier against the ingress of fine dust, moisture, and slurry. This “seal-for-life” approach significantly extends maintenance intervals, allowing operators to focus on their tasks rather than daily equipment servicing. Whether used for erecting miles of fencing in a cattle ranch or planting saplings in a forestry operation, this gearbox delivers consistent power transfer from the PTO shaft to the auger, ensuring clean, precise holes every time. The synthesis of robust materials, thermal management, and superior sealing makes this unit the definitive choice for professionals seeking a replacement for the Comer T-304C.
4. Optimized for Brazilian Agriculture & Regulatory Compliance (NR-12)
Brazil’s agricultural sector is characterized by its vast diversity of soil types, ranging from the distinct “Terra Roxa” in the south to the acidic, compacted soils of the Cerrado region in states like Mato Grosso and Goiás. These specific geological conditions present unique challenges for earth-drilling equipment. The EP-Post Hole Digger Gearbox has been stress-tested to perform exceptionally well in Brazil’s heavy clay and latosol soils, which require higher torque output to penetrate effectively without stalling the tractor. The high-torque capabilities of our 3:1 ratio gearbox ensure that even in the dry season, when the soil surface hardens significantly, the auger maintains steady rotational force. This makes it an ideal component for the expansion of coffee plantations in Minas Gerais or the maintenance of vast eucalyptus forestry projects where precision and speed are paramount. Additionally, the gearbox’s exterior coating utilizes a high-grade, corrosion-resistant paint capable of withstanding the high humidity and tropical rains typical of the Amazonian and Atlantic Forest regions, preventing rust and degradation of the housing integrity over years of exposure.
From a regulatory standpoint, safety and compliance are non-negotiable in the modern Brazilian market. Our products are designed with strict adherence to Norma Regulamentadora No. 12 (NR-12), which establishes safety standards for machinery and equipment to ensure the protection of workers. The input shaft of our EP-T304C replacement gearbox is designed to seamlessly interface with safety-guarded PTO shafts, featuring the necessary groove and dimensions to secure protective plastic shielding (proteção de TDF). This compliance is critical for machinery manufacturers (OEMs) and distributors in Brazil to avoid heavy fines and ensure the safety of rural operators. Furthermore, we align with international standards such as ISO 4254-1 (Agricultural machinery – Safety), ensuring that our gearboxes meet global export criteria. In neighboring regions like Argentina and Uruguay, similar safety protocols are observed, making this gearbox a universally compliant solution for the South American Mercosur market. We also provide documentation and support to assist importers in navigating the specific bureaucratic requirements of ANVISA or MAPA where applicable for machinery parts imports, ensuring a smooth supply chain flow.
5. Working Principle, Material Metallurgy
Operational Mechanics
The fundamental working principle of the EP-Post Hole Digger Gearbox involves the transmission and conversion of rotational energy from a horizontal plane to a vertical plane. Connected to the tractor’s Power Take-Off (PTO) via a drive shaft, the gearbox receives input energy at a standard speed (typically 540 RPM). Inside the housing, a bevel gear set reduces this speed while simultaneously multiplying the torque output by a ratio of roughly 3:1. This torque multiplication is critical; it converts the high-speed, low-torque input into a low-speed, high-torque output capable of driving a large diameter auger bit through resistant earth. The output shaft, positioned vertically, transfers this force directly to the digging screw.
Advanced Material Composition
Housing: Manufactured from HT250 Grey Cast Iron, offering superior vibration damping and thermal conductivity.
Gears: Precision-cut 20CrMnTi Alloy Steel, carburized to HRC 58-62 hardness for extreme wear resistance.
Shafts: 40Cr Steel, induction hardened to withstand torsional stress and shear forces.
Seals: NBR (Nitrile Butadiene Rubber) double-lip seals resistant to oil, heat, and abrasive soil particles.
6. Application Scenarios
1. Tree Planting
Application: When planting trees or saplings, a post hole digger powered by the EP gearbox can create precise holes for planting. The gearbox ensures efficient operation, allowing for faster and deeper digging, which is essential for young trees to establish their roots properly.
Benefit: Increases planting speed and accuracy, helping cover large areas efficiently.
2. Fence Installation
Application: Installing fences, particularly in large agricultural fields or rural properties, requires digging numerous post holes. The EP-Post Hole Digger gearbox, with its robust performance, makes the task quicker and more manageable by powering the post hole digger to create uniform and precise holes for fence posts.
Benefit: Saves time and energy when digging deep holes for fence posts, even in tough soil conditions.
3. Construction and Landscaping
Application: In construction sites, landscaping projects, or creating garden beds, the gearbox can be used to dig holes for structural support, posts, or other installations that require consistent hole depth and diameter.
Benefit: Improves productivity by ensuring consistent hole creation, vital for structural integrity in both landscaping and building tasks.
4. Agricultural Irrigation Systems
Application: Installing irrigation systems requires digging holes for pipes or stakes to secure irrigation lines. The EP gearbox helps achieve uniform hole depth, ensuring proper installation of irrigation infrastructure.
Benefit: Ensures accurate hole depths for installing irrigation systems, enhancing water distribution efficiency.
5. Ground-Source Heat Pump Systems
Application: Ground-source heat pumps require deep, narrow holes for installing heat exchange systems. The EP-Post Hole Digger gearbox, with its reliable performance, facilitates the accurate drilling of holes for these installations.
Benefit: Reduces installation time for geothermal systems, providing consistent results with reduced effort.
6. Farm Infrastructure Projects
Application: When building agricultural structures such as barns, greenhouses, or livestock enclosures, the EP-Post Hole Digger gearbox helps dig the necessary holes for foundation posts, poles, and supports.
Benefit: Facilitates construction of farm infrastructure by quickly creating holes for foundations and supports, saving labor and time.
7. Land Clearing and Preparation
Application: For land clearing, especially when preparing large plots for new crops, orchards, or construction projects, the gearbox aids in digging holes for various purposes, from planting to fencing or marking boundaries.
Benefit: Speeds up the process of land preparation, making it easier to plant trees, set boundaries, or mark specific areas.
8. Post Hole Digging for Power and Communication Poles
Application: The gearbox is also ideal for digging deep, narrow holes for utility poles or communication towers in rural or remote areas. The gear system ensures that even tough ground conditions don’t hinder the digging process.
Benefit: Ideal for installing power or communication poles efficiently in different terrains.
9. Surveying and Mapping
Application: When surveying land for future construction or agricultural projects, precision is crucial. The gearbox-driven post hole digger ensures uniform holes for marking and mapping, helping surveyors establish accurate boundary points.
Benefit: Provides precision and speed for land surveying applications, improving productivity.
10. Public Works and Roadside Maintenance
Application: Public works projects that require digging holes for road signs, light posts, or markers benefit from the EP-Post Hole Digger gearbox. Its reliable performance ensures the installation of these posts is quick and accurate.
Benefit: Helps install infrastructure like traffic signs or light posts efficiently, even in busy or hard-to-reach areas.

7. Interchangeability & Brand Compatibility
| Brand / Manufacturer | Original Model Code | EP Replacement Model | Compatibility Notes |
|---|---|---|---|
| Comer Industries | Code T-304C | EP-T304C | 100% Direct Replacement |
| Omni Gear | PHD-26 Series | EP-T304C | Verify Output Shaft Dia. (2″ vs 1.25″) |
| Bush Hog | Standard PHD Gearbox | EP-T304C | Universal Mounting Pattern Matches |
| Land Pride | PD10 / PD15 Series | EP-T304C | Check specific Ratio requirements |
* Note: All brand names are for reference purposes only. Colombia Ever-power pto shaft Co., Ltd. is an independent manufacturer providing compatible solutions.
8. Market trends
The agricultural gearbox market is undergoing a significant transformation, driven by the dual needs of precision agriculture and equipment durability. In 2024 and moving into 2025, we are observing a distinct trend towards Modular Durability. Farmers in Brazil and globally are moving away from disposable, low-quality components and investing in gearboxes that offer serviceability and higher torque densities. The demand for replacement parts like the EP-T304C is rising not just due to wear and tear, but because operators are retrofitting older implements with higher-capacity gearboxes to handle tougher soil conditions brought on by climate variability.
Another emerging trend is the integration of Enhanced Sealing Technologies. As environmental regulations regarding soil contamination become stricter (such as those monitored by IBAMA in Brazil), gearboxes that prevent oil leaks are becoming a standard requirement. Our latest iterations focus on triple-lip seal protection to ensure zero leakage, protecting both the mechanical integrity of the gearbox and the environmental integrity of the farmland. Furthermore, the market is seeing a shift towards “Universal Fit” designs that simplify inventory for dealers, allowing a single robust gearbox model to service multiple brands of implements, reducing supply chain complexity in the B2B sector.
9. Why Choose Us?
-
Comprehensive Solutions: Entendemos a importância de ter componentes confiáveis e compatíveis em suas máquinas. Ao oferecer tanto caixas de engrenagens agrícolas quanto eixos de tomada de força (TDP), garantimos que cada peça funcione em perfeita harmonia, melhorando a eficiência e reduzindo o tempo de inatividade.
-
Built for DurabilityNossos eixos de TDF são construídos com materiais de alta qualidade para suportar as condições de trabalho mais difíceis. Se você está impulsionando equipamentos pesados ou mantendo maquinário agrícola de pequena escala, nossos eixos de TDF fornecem a resistência e a confiabilidade de que você precisa.
-
Seamless Integration: Projetados para complementar perfeitamente nossas caixas de engrenagens agrícolas, nossos eixos de TDF garantem uma transmissão de potência suave, aprimorando o desempenho geral de seu equipamento. Essa integração perfeita permite maximizar a produtividade e reduzir falhas mecânicas.
-
Customizable Options: We offer a wide range of PTO shaft options, from standard configurations to custom solutions, ensuring that your specific needs are met. Whether you’re working in agriculture, construction, or any related field, we’ve got the perfect PTO shaft for you.
-
Cost-EffectiveAo adquirir caixas de transmissão agrícolas e eixos de tomada de força de um único fornecedor, você economiza custos e otimiza seu processo de aquisição. Nossos produtos são projetados para oferecer valor duradouro, reduzindo a necessidade de substituições frequentes.
-
Reliable Service and SupportNossa equipe de especialistas está sempre à disposição para auxiliar na seleção de produtos, instalação e conselhos de manutenção. Estamos comprometidos em garantir que seus maquinários funcionem de forma suave e eficiente, para que você possa focar em seu trabalho sem interrupções.
10. Related Products-PTO Shaft
At EVER-POWER, we not only focus on producing high-quality agricultural gearboxes, but also on manufacturing a critical component that powers various agricultural and industrial applications – the power take-off shaft (PTO shaft). Our PTO shafts are designed to meet the demanding requirements of modern agricultural equipment, providing durability and efficiency for a wide range of operations.Compatible with local Brazilian industries.
Our PTO Shaft product types include: PTO Shaft for Discbines, PTO Shaft for Feed Mixers, PTO Shaft for Flail Shredders, PTO Shaft for Round Balers, and PTO Shaft for Square Balers.

Frequently Asked Questions (FAQ)
Q1. How much does it cost to ship a bulk order of EP-T304C replacement gearboxes to the Port of Santos, Brazil?
A1. The shipping cost to the Port of Santos varies depending on the current international freight rates and the total volume of your order. We offer competitive FOB and CIF pricing models specifically for our Brazilian B2B clients. To get an accurate quote that includes insurance and freight, please contact our sales team directly with your estimated quantity.
Q2. Is this agricultural gearbox fully compatible with Massey Ferguson or Valtra tractors commonly used in Brazil?
A2. Yes, absolutely. The EP-T304C is designed with a standard 1 3/8″ Z6 spline input shaft, which is the universal standard for PTO connections. It connects seamlessly to the PTO drive shafts used on Massey Ferguson, Valtra, and John Deere tractors that are prevalent in the Brazilian agricultural market.
Q3. What type of gear oil should I use for this post hole digger gearbox in tropical climates like Mato Grosso?
A3. For tropical climates typical of Mato Grosso or Goiás, we recommend using a high-quality SAE 90 or SAE 85W-140 gear oil. The higher viscosity helps maintain a protective film on the gears under high operating temperatures. Please note the gearbox is shipped dry and must be filled to the level plug before operation.
Q4. Does the EP-T304C gearbox comply with Brazilian NR-12 safety regulations for rotating machinery?
A4. Yes, compliance is a priority. Our gearbox housing features specific mounting points to accommodate standard safety shields (proteção de cardan). When properly installed with the PTO shaft guard and auger shield, the setup meets the safety requirements of NR-12, helping to prevent operator entanglement accidents.
Q5. Where can I find a supplier that offers spare parts like output seals and bearings for this gearbox?
A5. We provide a complete range of spare parts, including double-lip output seals, tapered roller bearings, and gasket kits. As the direct manufacturer, we ensure that you have long-term access to maintenance components, so you don’t need to search for third-party suppliers for critical spares.
Q6. Which post hole digger brands can I repair using this Comer Code T-304C replacement gearbox?
A6. This unit serves as a universal replacement for many brands including Bush Hog, Land Pride, Rhino, and many Brazilian OEM implement manufacturers that utilize the Comer T-304 mounting pattern. It is the ideal solution for repairing aging diggers without buying a whole new machine.
Q7. How do I prevent the output shaft from breaking when drilling in rocky Brazilian soil?
A7. Our EP-T304C is equipped with a high-strength 2-inch alloy steel output shaft designed for durability. However, to prevent breakage in rocky soil, it is essential to use a PTO shaft equipped with a shear bolt or slip clutch. This safety mechanism disengages power if the auger hits an immovable rock, protecting the gearbox internals.
Q8. What is the lead time for manufacturing a container load of gearboxes for export to South America?
A8. Standard lead times for container-load manufacturing are typically 30 to 45 days. Shipping to South American ports like Rio Grande or Paranaguá usually adds another 30 to 40 days. We recommend planning your inventory needs 3 months ahead of the planting season.
Q9. Can this gearbox handle 18-inch or 24-inch auger bits for tree planting applications?
A9. While the gearbox has a robust 3:1 ratio, using augers larger than 12-14 inches depends heavily on soil density and tractor horsepower. For 18-24 inch bits in heavy clay, we recommend checking your tractor’s HP rating; usually, a minimum of 45-50 HP is suggested to prevent stalling.
Q10. Do you provide technical drawings or 3D models to verify the mounting dimensions before I buy?
A10. Yes, as a professional gearbox manufacturer, we provide full technical support. Upon request, we can send detailed dimensional drawings (PDF) or 3D models to help you verify that the mounting ears and shaft lengths match your existing equipment perfectly before you finalize your purchase.
Editor: PXY



