Descripción
EP03 Agriculture Gearbox For Hay Tedder
SKU: EP03 | Category: Hay Tedder Gearbox | Agricultural Gearbox | PTO Drive Systems
Ratio 2.63:1 | Input 400 RPM | Output 363 N·m | 6 kW / 8.1 HP Input Power
1. Technical Specifications — EP03 Hay Tedder Gearbox
The following 20 parameters define the engineering baseline of the EP03 under standard operating conditions. Application-specific data and custom configuration specifications are available upon request from the technical team.
| # | Parameter | Value / Specification |
|---|---|---|
| 1 | Model Number | EP03 |
| 2 | Product Type | Agriculture Gearbox for Hay Tedder |
| 3 | Transmission Ratio | 2.63:1 |
| 4 | Rated Input Speed | 400 RPM |
| 5 | Maximum Input Power | 6 kW / 8.1 HP |
| 6 | Rated Output Torque | 363 N·m |
| 7 | Output Flange Type | B-Type — Ø112.5 (Ø115.5) |
| 8 | Material de vivienda | High-Strength Cast Iron HT250 |
| 9 | Gear & Shaft Material | Acero aleado 20CrMnTi |
| 10 | Gear Surface Treatment | Gas Carburizing + Quenching + CNC Profile Grinding |
| 11 | Dureza de la superficie del engranaje | 58 – 62 HRC |
| 12 | Tipo de rodamiento | Tapered Roller Bearing, ISO 355 |
| 13 | Lubrication System | Splash Lubrication — ISO VG 220 Gear Oil |
| 14 | Seal Type | Nitrile Rubber (NBR) Shaft Seals |
| 15 | Sealing / Protection Rating | IP54 |
| 16 | Operating Temperature Range | -15°C to +75°C |
| 17 | Noise Level (Full Load) | ≤ 70 dB(A) |
| 18 | Transmission Efficiency | ≥ 94% |
| 19 | Design Service Life (Main Parts) | ≥ 20,000 hours |
| 20 | Overall Dimensions (L × W × H) | 240 × 185 × 160 mm |
* Reference values under standard test conditions. Custom specifications available on enquiry.
2. Five Key Advantages of the EP03 Hay Tedder Gearbox
When evaluating Hay Tedder Gearbox options for implement procurement or OEM assembly, the EP03 stands apart in five specific areas that determine real-world performance and long-term ownership cost.
1. Purpose-Matched 2.63:1 Ratio for Hay Tedder Drum Dynamics
The transmission ratio of a Hay Tedder Gearbox is not a generic parameter — it must match the specific angular velocity requirements of the tedder rotor to produce the correct tine tip speed for effective crop lifting without excessive soil disturbance or crop damage. The EP03’s 2.63:1 ratio is calibrated for 400 RPM PTO input, producing an output shaft speed that gives single-rotor hay tedders the rotational range needed to achieve thorough, consistent windrow inversion across varying crop densities. This means cleaner, faster drying of cut forage rather than the uneven drying and crop quality losses that result from mismatched drive ratios — a detail that matters for Brazilian dairy and beef operators selling silage or hay bales at quality-differentiated prices.
2. High Output Torque — 363 N·m at Rated Operating Conditions
Output torque of 363 N·m ensures the EP03 maintains consistent drum rotation even during passage through dense, heavy windrows of thick-stemmed crops like Tifton 85 bermudagrass or multi-cut ryegrass — conditions that regularly appear in southern Brazil’s intensive hay production areas. Many lower-specification gearbox alternatives in this torque class struggle to maintain steady output under peak load, leading to speed variation at the rotor and uneven tedding passes. The EP03’s rated torque headroom, combined with its carburized and ground internal gear components, sustains stable power delivery throughout the rotor without the slip, vibration, or noise increase that indicates gear fatigue in lesser assemblies. For commercial haymakers running long daily operating shifts, this stability is directly reflected in consistent bale density and forage quality.
3. Compact, Field-Serviceable Housing Design
Agricultural gearboxes that require specialist workshop equipment for bearing and seal changes create real operational risk during haymaking season, when weather windows are narrow and delays are costly. The EP03 housing is designed with this reality in mind: standard metric fasteners throughout, clearly accessible drain and fill ports, and a housing geometry that allows bearing inspection and replacement with tools available in a typical farm workshop. The B-type output flange conforms to the Ø112.5 (Ø115.5) mounting pattern, which is compatible with the majority of commercial single-rotor hay tedder frames from European and South American manufacturers. This dimensional standardization means the EP03 functions as a direct hay tedder gearbox replacement across a wide range of existing machine frames without modification to the mounting structure.
4. Long Service Life Through Hardened Gear Components
Main gear and shaft components in the EP03 are manufactured from chromium-manganese-titanium case-hardening steel (20CrMnTi), processed through gas carburizing, quenching, and CNC profile grinding to achieve 58–62 HRC surface hardness on all active tooth faces. The sub-surface core is retained at a lower hardness (approximately 35–40 HRC) to absorb impact loads from sudden load changes during tedding without brittle fracture propagation. Under correctly maintained lubrication conditions, the primary structural components of the EP03 are rated for a service life exceeding 20,000 operating hours — a figure that substantially exceeds what seasonal agricultural use places on the gearbox across its working life. For buyers evaluating hay tedder gearbox quality, this longevity translates directly to a lower total cost per season of operation.
5. Custom OEM Manufacturing — Small Batches Accepted
For implement manufacturers developing new tedder models or rebuilding existing production lines around updated specifications, the EP03 platform supports full custom production against client-supplied engineering drawings or sample gearboxes. Modified input shaft diameters, alternative keyway dimensions, non-standard flange bolt circle patterns, and custom paint or coating specifications can all be accommodated. Minimum order quantities for standard units are competitive with established hay tedder gearbox manufacturers in the market, and the in-house tooling capability means that engineering changes can be prototyped and validated quickly — an important consideration for OEM customers managing product introduction timelines. Documentation in Portuguese is available on request for Brazilian import and CE declaration requirements.
3. Hay Tedder Gearbox Working Principle
Understanding the Hay Tedder Gearbox working principle begins at the tractor’s PTO output shaft. When the tractor PTO is engaged — at the standard agricultural speed of 540 RPM for most tractors, or in the case of the EP03 at the implement-specific input speed of 400 RPM — the PTO shaft delivers rotational power through a universal-jointed drive shaft to the gearbox input. The input shaft of the EP03 receives this rotation and transmits it to the internal gear set, which consists of precision-ground bevel and helical gears arranged to change the rotation axis orientation (from horizontal/longitudinal to transverse) and multiply the torque while reducing speed according to the 2.63:1 reduction ratio.
Inside the gearbox housing, the gear train operates in a continuous oil bath of ISO VG 220 gear lubricant, which provides hydrodynamic film separation between gear tooth surfaces during mesh and between bearing inner and outer races during rotation. This splash lubrication approach — where gear rotation continuously lifts oil from the sump and distributes it across the gear faces and bearing races — requires no external pump, no active oil circulation system, and no electrical components. It is inherently robust and maintenance-friendly, which is why it remains the standard approach for agricultural gearboxes operating in environments where maintaining complex auxiliary systems is impractical.
The output shaft exits the housing at the B-type flange mounting face and connects to the hay tedder’s rotor drive — driving the central drum shaft or the rotor arm carrier plate that spins the tine arms. As the rotor turns, the curved steel tines trace a cycloid path relative to the ground, gently lifting cut crop from below and projecting it in an arc to spread it across a wider area or invert the windrow. The quality of this motion — smooth, consistent, and at the right tip speed for the crop type — depends on the gearbox maintaining a steady output rotational speed under varying torque demand. The EP03’s robust gear geometry and bearing arrangement support exactly this kind of load-stable output.
This is the fundamental answer to the question what is Hay Tedder Gearbox function: it is the mechanical interface that makes the tractor’s PTO output useful for a specific implement task, translating raw rotational power into the precise speed and torque profile that efficient hay tedding requires. When the gearbox is correctly matched to the machine and properly maintained, the entire tedding process — and therefore the quality of the dried forage crop — proceeds as intended.
4. Material Composition
The EP03’s material selection reflects the straightforward but demanding requirements of an agricultural field gearbox: it must withstand sustained rotational loads, intermittent shock inputs, outdoor temperature cycling, and seasonal exposure to moisture and crop debris — all while remaining repairable with standard workshop tools and commercially available replacement parts. Every material choice in the EP03 traces back to these operational realities rather than cost reduction or nominal specification compliance.
The outer housing is cast from HT250 grey cast iron, a grade used extensively in agricultural gearbox manufacturing for its combination of high compressive strength, effective vibration damping, and excellent dimensional stability following controlled cooling from the casting process. The pearlitic matrix of HT250 also provides inherent lubricity at bearing bore surfaces, reducing the risk of fretting wear between the housing and outer bearing races during the vibration-rich operation typical of tine-carrying rotary implement drives. Precision bores for bearing seats are machined in a single setup to maintain concentricity and squareness, ensuring correct bearing geometry and minimizing shaft deflection under load.
Internal gears and shafts are produced from 20CrMnTi alloy steel — the standard case-hardening grade for Chinese and internationally exported agricultural machinery gearboxes, favored for its combination of deep hardenability, fine grain size, and resistance to impact fracture at sub-zero temperatures. Following rough turning and gear hobbing, components are loaded into controlled atmosphere furnaces for gas carburizing at temperatures around 930°C, building a carbon-enriched surface layer 0.8 to 1.2 mm deep. Quenching arrests the microstructure with surface hardness at 58–62 HRC and a retained tough core at approximately 35–40 HRC. Final gear tooth geometry is achieved by CNC profile grinding, which corrects any distortion from the heat treatment cycle and holds tooth form within ISO 6336 accuracy requirements. Tapered roller bearings throughout the assembly comply with ISO 355 dimensional standards, ensuring interchangeability with bearings available from distributors across Brazil and globally.
5. Application Scenarios
The EP03 Agricultural Hay Tedder Gearbox serves a range of haymaking and forage management applications where PTO-driven rotary equipment must deliver consistent power transmission across full-season field operations.
Single-Rotor Hay Tedders — Dairy & Beef Farm Haymaking
The EP03’s primary application is as the drive gearbox for single-rotor hay tedders on dairy and beef cattle farms in southern Brazil — particularly in Rio Grande do Sul, Santa Catarina, and Paraná, where cool-season grasses like ryegrass, oats, and azevém are cut and dried for silage bales or dry hay storage. The 2.63:1 ratio is well-matched to the drum speed requirements of standard single-rotor tedder frames in the 2.0 to 3.5-meter working width range. Reliable, vibration-free operation through the gearbox is essential for these operators, who often work narrow weather windows between rainfall events during the haymaking season.
Tifton 85 & Brachiaria Pasture Haymaking — Beef Feedlot Supply
Brazil’s expanding beef feedlot sector in the Cerrado and transition zones of Mato Grosso do Sul, Goiás, and Minas Gerais uses large volumes of high-quality hay — particularly Tifton 85 bermudagrass and Brachiaria hay — for dry-season supplemental feeding. Tedding these coarser, higher-density tropical grasses places greater continuous torque demands on the gearbox than cool-season grass tedding, and the EP03’s 363 N·m output torque rating provides adequate headroom for sustained operation through dense windrows without the overheating or premature bearing wear that occurs when underpowered hay tedder gearbox parts are used in high-density tropical pasture hay work.
Implement OEM Assembly — Hay Tedder Manufacturing
Agricultural implement manufacturers building hay tedder machines for domestic Brazilian sale or export to neighboring South American markets — Argentina, Uruguay, Paraguay — use the EP03 as an OEM component in their tedder drive assemblies. The B-type output flange (Ø112.5/Ø115.5) conforms to the mounting pattern used by the majority of single-rotor tedder arm carriers, simplifying integration without custom adapter plates. Support for custom engineering modifications and small production batch manufacturing makes the EP03 particularly practical for smaller OEM workshops producing regional implement variants designed for specific South American terrain and crop type combinations.
Hay Tedder Fleet Maintenance — Farm Workshop Replacement Parts
Farm machinery workshops servicing a fleet of hay tedders across a large property or for a contracting operation need a reliable source of hay tedder gearbox replacement units that fit standard frame dimensions without lengthy lead times or complex import procedures. The EP03’s dimensional compatibility with common tedder frame mounting configurations — combined with acceptance of small order quantities and inventory availability for prompt shipment — makes it well-suited to the farm workshop replacement parts market. Experienced workshop mechanics familiar with how to use Hay Tedder Gearbox assemblies during seasonal rebuilds will find the EP03 consistent with standard installation practices and tolerances.
Forage Cooperative & Agricultural Services Contractors
Agricultural service contractors in Brazil’s hay-producing regions operate tedders on a commercial hire basis, working across multiple properties during the brief weather windows available for haymaking. Their machines accumulate operating hours rapidly — sometimes reaching 300 to 500 hours in a single season — placing sustained mechanical demands on the gearbox that go well beyond what farm-owned equipment typically experiences. The EP03’s rated service life and robust internal construction support this high-utilization operational profile. The availability of a defined hay tedder gearbox kit of consumable parts — seals, bearings, oil — enables cooperative maintenance coordinators to carry a standardized service kit for all tedders in the fleet rather than managing diverse part numbers across multiple gearbox brands.
6. Regulatory & Compliance Framework by Region
Agricultural gearbox components and the hay tedder machines they power are governed by machinery safety, product liability, and environmental regulations in all major markets. Buyers, importers, and OEM manufacturers have compliance obligations that vary by destination country and should be factored into component procurement decisions.
Brazil — MAPA, ABNT & INMETRO
In Brazil, agricultural machinery — including hay tedders and their drive assemblies — falls under the regulatory scope of the Ministério da Agricultura, Pecuária e Abastecimento (MAPA) and is subject to technical standards from the Associação Brasileira de Normas Técnicas (ABNT). ABNT NBR ISO 11684 governs safety signs and hazard marking requirements on agricultural machinery; ABNT NBR 14990 covers general safety requirements for field equipment. Commercial imports of agricultural machinery sub-assemblies through registered importers may require INMETRO conformity documentation. All technical documentation, installation manuals, and safety information for machines sold commercially in Brazil must be available in Portuguese. Buyers sourcing a hay tedder gearbox for sale from overseas suppliers should request a Brazilian Portuguese technical manual and a conformity declaration covering ABNT standards as part of the standard delivery documentation.
European Union — CE Marking & Machinery Directive
Agricultural machinery and sub-assemblies placed on EU markets must comply with the Machinery Directive 2006/42/EC — and from January 2027, with EU Machinery Regulation 2023/1230 — which requires a risk assessment, Declaration of Incorporation for partly completed machinery, and a Technical File. ISO 11684 (safety signs), ISO 4254-1 (agricultural machinery general safety), and EN ISO 4413 (fluid power safety where hydraulic-assist systems are present) are among the harmonized standards applicable to hay tedder drive systems. CE-marked gearbox assemblies must be supplied with a Declaration of Conformity, and the technical file must be maintained for a minimum of ten years after the last unit is placed on market.
United States — ASABE Standards & OSHA
In the United States, the American Society of Agricultural and Biological Engineers (ASABE) publishes voluntary engineering standards that are widely referenced by equipment manufacturers and insurers, including ASABE S318 on agricultural machinery terminology and EP496 on safety for PTO-driven implements. OSHA 29 CFR 1910 regulations on power transmission equipment safety apply to commercial agricultural operations. Importers and distributors of hay tedder gearbox components in the US should confirm compliance with applicable ASABE standards and obtain appropriate product liability documentation from the manufacturer as part of their supply agreement.
Australia & New Zealand
Agricultural machinery in Australia operates under the AS 4024 Safeguarding of Machinery series and Safe Work Australia codes governing powered equipment used in primary production. In New Zealand, the Health and Safety at Work Act 2015 and associated WorkSafe New Zealand guidance apply. PTO-driven machinery safety requirements — including guarding specifications and power transmission safety standards — are particularly relevant for hay tedder operators in both markets. Gearbox components imported for machinery use in Australia should carry materials certification and dimensional data conforming to AS/NZS frameworks used by local OEM builders.
ISO International Standards
Globally, ISO 4254-7 (safety of self-propelled and non-self-propelled agricultural machinery — hay and forage equipment), ISO 6336 (gear load capacity calculations), ISO 9409-1 (mounting flanges), and ISO 11684 (safety signs) collectively establish the international design and documentation baseline for agricultural gearboxes. Products developed against these standards support multi-market regulatory compliance and facilitate technical communication between buyers and suppliers regardless of geographic location. The EP03 is designed to align with these international standards, making it suitable for both domestic Brazilian deployment and export to regulated markets.
7. About Our Manufacturing Capability
We are a specialized manufacturer of agricultural power transmission components with production capabilities spanning the full range of gearbox types used in field implement applications — including Hay Tedder Gearbox assemblies, bevel gearboxes, worm gearboxes, and PTO shaft accessories. Our production plant operates CNC turning and milling centers, gear hobbing machines, CNC profile grinding equipment, controlled-atmosphere heat treatment furnaces, and coordinate measuring machines that together ensure consistent dimensional accuracy and gear geometry quality across production batches of any size.
WorkShop
8. Related Products & One-Stop Agricultural Drive Supply
A complete, well-integrated agricultural drivetrain requires more than a correctly specified gearbox. PTO shafts, chains, and sprockets must all be dimensionally and dynamically compatible with the gearbox they connect to — and sourcing them from a single supplier with full-system knowledge eliminates the interface compatibility guesswork that arises when parts come from multiple uncoordinated vendors. We manufacture and supply a complete range of agricultural power transmission accessories fully compatible with the EP03 Hay Tedder Gearbox. Explore our full range at agricultural-gearbox.net.
PTO Shafts for Hay Tedder Drives
PTO shafts for agricultural machinery are subject to the combined stresses of torque transmission, angular misalignment, and telescopic length variation as the tractor and implement move over undulating ground. Our telescopic PTO shafts with safety guard tubes are manufactured to 1 3/8″ 6-spline and 1 3/8″ 21-spline profiles at both 540 and 1,000 RPM speed ratings, with universal joints rated to the torque levels required by the EP03 input. Compatible cross-kit sizes are available as separate service items, ensuring operators can replace worn universal joint crosses without replacing the full shaft.
Drive Chains & Sprockets for Secondary Transmission
Secondary chain drives from the EP03 output shaft to tine arm carriers or cam plates in hay tedder assemblies require matched roller chain and sprocket sets where pitch accuracy and tooth form are consistent between chain and sprocket manufacturer. Our agricultural drive chains in ANSI 40, 50, and 60 series pitches are manufactured from case-hardened alloy steel with corrosion-resistant surface treatments, and our precision-machined sprockets in corresponding pitches are held to ISO 606 dimensional tolerances. Using a matched chain and sprocket set from a single supply source eliminates the accelerated pitch-line wear that develops when chain elongation characteristics and sprocket tooth geometry are not designed to work together. Full system compatibility with the EP03 is confirmed for standard chain drive ratios used in single-rotor tedder designs.
Frequently Asked Questions
Editor: PXY
