EP-HC-40002 Round Baler Gearbox – 85HP Heavy Duty
★ The Heaviest-Duty Gearbox in the HC Series — 85HP, 111kg, Three Reduction Ratios, Built for Round Baler Punishment
ال EP-40002 is not a general-purpose agricultural gearbox scaled up — it is a dedicated high-torque drive unit designed from the ground up for the cyclical shock loading, sustained compression, and extreme torque demands of large-format round baler operation. Three reduction ratios (3.2:1 / 3.77:1 / 4.17:1) and gear modules from M12 to M15 — the coarsest tooth pitch in the entire HC series — deliver the bending strength and surface durability that 85HP bale chamber drives require at every rotation. The 1 3/4″ Z6 spline input (a full step above the 1 3/8″ standard used on lighter units) and the Φ333mm circular flange housing at 111 كجم reflect the structural reality of this application: when a baler stalls in a heavy windrow, the drivetrain absorbs that energy somewhere — and it should be the overload clutch, not the gearbox. Supplied by Korea Ever-Power Agricultural Machinery Co., Ltd. to commercial baler manufacturers and large-scale farm operators across South Korea, Japan, and Southeast Asia.
What the EP-40002 Is — and the Problem It Solves
EP-40002 · 85HP · Ratios 3.2:1–4.17:1 · 111 kg · Φ333mm flange
Round balers operate under a load profile that no other agricultural implement replicates. Each bale cycle compresses a mass of crop from loose windrow material into a dense, tightly bound cylinder — and during that compression phase, the bale chamber resistance increases non-linearly. At peak chamber pressure, the drive system experiences torque spikes 3–5 times the average running load, delivered at unpredictable intervals depending on crop density, moisture content, and forward travel speed. A gearbox that performs adequately at average load will fail prematurely in this application because gearbox life is determined by peak loads, not mean loads.
The EP-40002 is built around this reality. The M12–M15 gear module range gives each tooth a face width and root fillet large enough to absorb repeated peak-load spikes without the progressive tooth-root cracking that develops in fine-pitch gearing under shock loading. The 111kg housing mass is not excess weight — it is the structural volume required to contain the large-module bevel gear set at the correct bearing span, maintain housing rigidity under the asymmetric forces generated during belt-wrap compression, and provide the oil sump capacity needed for sustained thermal management at 85HP.
ال 1 3/4″ Z6 spline input is the most visible departure from the standard HC mower and tiller range. This larger-diameter spline transmits the peak torque that 85HP at 540RPM represents — approximately 1,190 Nm at the input shaft — with the contact area and shear strength to do so across the cyclical load variation of baler operation without spline wear that would develop on the smaller 1 3/8″ interface used in lower-power units. Buyers replacing an existing round baler gearbox should confirm their tractor and machine PTO shaft standard before ordering: the 1 3/4″ Z6 is the correct specification for large-frame balers; it is physically incompatible with the 1 3/8″ shafts used on mowers and tillers in the same HP range.
Replacement Reference: The EP-40002 is engineered to match the specification of comparable Claas, Krone, New Holland, and John Deere OEM round baler drive gearboxes in the 85HP / high-reduction-ratio class. Korea Ever-Power is not affiliated with, sponsored by, or an authorised parts supplier for these OEM brands. Model references are provided solely to assist customers in identifying compatible replacement specifications. We manufacture and supply original products only — no counterfeit or imitation components.
Complete Technical Specifications — All Three Ratio Configurations
All parameters below are factory-verified from the official EP-40002 product datasheet. The module values listed alongside each ratio — M15, M13, M12 — represent the actual gear module for that tooth pair, not a nominal series designation. The module decrease as ratio decreases (from 4.17:1 to 3.2:1) follows the same progressive-module logic seen in the EP-75: lower ratios carry higher circumferential velocity at the tooth face, so a slightly smaller module (with higher tooth count) provides better tooth engagement smoothness while still meeting the bending strength requirement for 85HP. All three configurations share the same housing, input shaft, and output flange — only the internal gear set changes.
| المعلمة | Config A | Config B | Config C |
|---|---|---|---|
| نسبة السرعة | 3.2 : 1 | 3.77 : 1 | 4.17 : 1 |
| Teeth Count (input/output) | 15 / 48 | 13 / 49 | 12 / 50 |
| وحدة التروس | 15 / 48 | 13 / 49 | 12 / 50 |
| القدرة المقدرة | 85 HP | 85 HP | 85 HP |
| سرعة دوران الخرج (at 540 input) | ≈ 169 | ≈ 143 | ≈ 129 |
| عزم الخرج (calc. at rated HP) | ≈ 3,540 Nm | ≈ 4,170 Nm | ≈ 4,620 Nm |
| سرعة الإدخال المقدرة | 540 RPM — all configurations | ||
| عمود الإدخال | 1 3/4″ Z6 spline (larger than standard 1 3/8″ — verify before ordering) | ||
| Output / Mounting | Circular flange, Φ333mm OD · Φ296.8mm PCD · Φ235.6mm bore | ||
| مواد الإسكان | Nodular cast iron (GGG50) — heavy-section casting | ||
| الوزن الصافي | 111 kg — all configurations | ||
Φ333mm circular flange OD · housing height approx. 339.5mm
The engineering drawing confirms the EP-40002's circular flange mounting face: Φ333mm outer diameter, Φ296.8mm pitch circle diameter for the mounting bolt holes, Φ235.6mm bore — dimensions that align with the standard bolt-circle configurations used on large-format European round baler drive assemblies. The dual 1 3/4″ Z6 spline input sockets (one each side of the housing centreline, spaced at 1 3/4 Z20 as visible in the drawing detail) allow dual-side PTO input configurations used on certain baler designs where the drive shaft approaches from either side depending on the tractor-baler connection geometry.
The housing cross-section height of approximately 339.5mm reflects the physical space required by the large-module bevel gear pair. At M15 (Config A), the crown gear pitch diameter alone exceeds 720mm — this is not a standard mower-style gearbox that happens to have a large housing. The housing geometry is specifically designed around the gear set, with bearing spans and wall thicknesses calculated to maintain the correct gear mesh contact pattern under the asymmetric loads imposed by alternating compression and release cycles during bale formation.
Three Ratio Configurations — Matching Output Speed to Your Baler Design
Round baler rotor and bale chamber designs vary in their required input shaft speed depending on bale diameter, belt wrap system, and crop type. The EP-40002's three ratio options cover the speed range used across the main large-format baler designs in production today. All three are rated at the same 85HP — the ratio selection determines output speed and torque multiplication, not power capacity.
Quick selection guide: If you are replacing an existing OEM baler gearbox, match the original ratio as closely as possible. If you are specifying for a new baler build, calculate the required rotor shaft RPM from your bale chamber design and select the config whose output RPM at 540 input is closest to that requirement. Korea Ever-Power can provide ratio confirmation support — contact us with your baler make, model, and original gearbox part number for a direct match recommendation.
Understanding Output Torque — How to Calculate What Your Application Needs
Many gearbox buyers focus on the HP rating without calculating the actual output torque that their baler drive system will experience. For a علبة تروس مكبس البالات الدائرية, output torque is the number that determines whether a gearbox survives the bale-formation peak load cycle. Here is a straightforward calculation method:
Output Torque Formula
تout (Nm) = 9,550 × P (kW) ÷ nout (RPM)
Where P = rated power in kilowatts (85HP ÷ 1.341 = 63.4 kW) and نout = output shaft RPM at the selected ratio.
| نسبة | سرعة دوران الخرج | عزم الخرج | Typical baler chamber requirement |
|---|---|---|---|
| 3.2 : 1 | ≈ 169 RPM | ≈ 3,580 Nm | Light crop, dry conditions, higher rotor speed balers |
| 3.77 : 1 | ≈ 143 RPM | ≈ 4,230 Nm | Standard mixed crop, most commercial baler designs |
| 4.17 : 1 | ≈ 129 RPM | ≈ 4,690 Nm | Dense or wet crop, large bale diameter, maximum compression |
To use this table in practice: determine your baler's design bale chamber torque requirement from the machine manufacturer's service manual. The EP-40002 configuration whose output torque exceeds that requirement — with at least a 25% margin for peak load spikes — is the correct specification. If your calculated requirement falls between 3,500 and 4,700 Nm at 85HP, the EP-40002 covers it across the three configurations. If it exceeds 4,700 Nm at 85HP, contact Korea Ever-Power's technical team to discuss options.
Construction Quality — Why 111kg Is Structural Necessity, Not Excess
Large-Module Gear Mass
The bevel gear pair in Config A — 15-tooth pinion and 48-tooth crown at M15 — weighs significantly more than any gear set in the HC mower or tiller range. M15 tooth pitch means each tooth is 15mm in module, producing a gear face width and root cross-section that dominates the component weight. This gear mass cannot be reduced without reducing module — which directly reduces bending strength — so the 111kg is partly the unavoidable physical consequence of the gear specification.
Heavy-Section GGG50 Housing
At peak bale compression, the housing experiences the full reaction torque of the output shaft — approximately 4,200–4,700 Nm in Config B/C. The housing wall thickness and rib geometry are calculated to maintain housing torsional rigidity under this load without deflection that would change the gear mesh contact pattern. Thin-wall castings adequate for mower and tiller loads would deform measurably under baler peak loads, causing the contact stress concentration that leads to progressive tooth pitting.
محامل أسطوانية مخروطية كبيرة
The bevel gear set at this scale requires large-bore tapered roller bearings — not the deep-groove ball bearings used in smaller units — to manage the combined radial and axial loads at the gear mesh faces. Tapered roller bearings in agricultural heavy-duty sizes carry substantial mass in their own right; they also require precision-machined seats and pre-load settings that demand the housing wall dimensions present in the EP-40002.
High-Capacity Oil Sump
The housing volume supports a large oil charge — estimated 2.0–2.5 litres of SAE 90 gear oil based on housing dimensions. During sustained baling operation at peak output — 4+ hours of continuous heavy baling in dense crop conditions — the gear oil is the primary mechanism for removing heat from the gear mesh and bearing interfaces. The large sump volume provides the thermal buffer required to avoid oil degradation under these conditions, which would otherwise require frequent oil changes during the baling season.
Carburised & Quench-Hardened Gear Faces
All EP-40002 gear faces are carburised to 0.8–1.2mm case depth and quench-hardened to HRC 58–62, identical to the specification used across the HC series. At M12–M15 module, carburising penetrates a proportionally smaller fraction of the tooth height than at smaller modules — the heat treatment specification accounts for this by targeting the root fillet zone where bending stress is highest, not just the tooth face where contact stress occurs.
Full-Load Bench Test — Every Unit
Every EP-40002 is run at full rated load on a calibrated test bench before packaging. For a 111kg unit, this test is not trivial — it requires a test rig capable of absorbing 85HP at the output shaft while monitoring gear mesh noise, bearing temperature, oil seal integrity, and housing vibration. Units that pass this test have demonstrated their capacity under conditions that replicate baler operation, not just assembly quality.
EP-40002 vs. EP-BGB8 — Choosing Between Korea Ever-Power's Two Baler Gearboxes
Korea Ever-Power supplies two gearboxes for baling applications. The EP-BGB8 (30HP, dual-ratio, 18kg) covers the light-to-medium baler segment. The EP-40002 (85HP, three-ratio, 111kg) covers commercial-scale large baler operation. The choice is straightforward once the application is defined:
| Factor | EP-40002 | EP-BGB8 |
|---|---|---|
| القدرة المقدرة | 85 HP | 30 HP |
| عمود الإدخال | 1 3/4″ Z6 (large frame) | 1 3/8″ Z6 (standard) |
| خيارات النسبة | 3.2:1 / 3.77:1 / 4.17:1 | 1:1 / 1.67:1 |
| أقصى عزم دوران ناتج | ≈ 4,690 Nm | ≈ 590 Nm |
| الوزن الصافي | 111 kg | 18 كجم |
| Bale Format | Large commercial round baler (≥1.2m bale diameter) | Small-medium round baler, hobby/small farm use |
| Choose When | Commercial farm, contractor, OEM baler manufacturer | Small farm, hobby baler, light baling duty |
Do not attempt to use the EP-BGB8 (30HP, 18kg) on a machine designed for the EP-40002 (85HP, 111kg) class. The power rating difference is nearly 3:1 and the torque multiplication nearly 8:1 — a light-duty unit operated at heavy-duty loads will fail within one baling season, with potential for housing fracture and secondary machine damage.
Where the EP-40002 Is Used
🌾 Large Commercial Round Balers — Korean Hay & Straw Operations
South Korea's forage hay production concentrated in Gangwon and Gyeongbuk provinces — timothy, rye grass, and Italian ryegrass for the domestic dairy and beef cattle industry — uses large-format round balers producing 1.2–1.5m diameter bales at typical throughputs of 40–80 bales per hour during peak season. The 85HP tractors operating in these conditions demand a baler gearbox rated for sustained full-load operation, not occasional peak use. The EP-40002 at Config B (3.77:1) is the standard specification for Korean large-round-baler builds targeting this market segment, where bale density requirements are high and stoppages for gearbox failure represent significant revenue loss during the narrow baling window.
🏭 OEM Baler Manufacturing — Korea & Southeast Asia
Several Korean agricultural machinery manufacturers building large round balers for domestic sale and export to Southeast Asia and the Middle East specify the EP-40002 as their OEM baler gearbox. The circular flange mounting standard (Φ333mm OD) aligns with the drive housing dimensions used in European baler designs that have been the reference point for Korean OEM engineering teams. Korea Ever-Power supplies OEM customers with confirmed matching dimensional certification, dedicated stock allocation, and volume pricing — contact our technical sales team for OEM programme details including customisation options (housing colour, shaft specifications, marking).
🌿 Rice Straw Baling — Vietnam, Thailand & Philippines
Post-harvest rice straw baling is a growing application across the Mekong Delta in Vietnam, the Chao Phraya basin in Thailand, and Luzon's central plain in the Philippines, where rice straw is processed for mushroom cultivation media, animal feed, and industrial fibre rather than burned in field. Rice straw baling at commercial scale uses large-format round balers on 80–100HP tractors. The high moisture content of freshly harvested straw (30–45% moisture at the time of field baling) significantly increases bale chamber resistance compared to dry hay, making the higher-torque EP-40002 configurations (Config C, 4.17:1) the preferred specification for operations in the wet baling conditions common to these tropical and subtropical growing regions.
🌽 Corn Stover Baling — Contract Operations
Corn stover baling for biogas feedstock and cattle bedding — a growing contract service in Korea's Gyeonggi and Chungcheong provinces — involves some of the most demanding baler drive conditions in agricultural machinery. Corn stover at harvest moisture is dense, lignin-rich, and prone to bridging in the bale chamber, creating sharp torque spikes well above the mean drive load. The EP-40002 at Config C (4.17:1, ≈4,690 Nm output torque) is specified by Korea Ever-Power's commercial contractor customers for this application — the maximum torque multiplication provides the force to overcome chamber stalls without requiring the operator to reduce forward speed below profitable throughput rates.
Why Commercial Baler Operators Choose Korea Ever-Power
Heavy-section gear machining — dedicated production capacity for large-module bevel gears
Korea Ever-Power Agricultural Machinery Co., Ltd. manufactures the EP-40002 at a 3,800 m² production facility with CNC gear hobbing capability sized for the large-module gears required in this class. The M12–M15 bevel gear pairs in the EP-40002 are machined on the same hobbing equipment used for the full HC series, but the process parameters — feed rates, cutting speeds, and heat treatment protocols — are specifically set for heavy-section gear production. This is not a light-duty manufacturer scaling up; 19 years of agricultural gear production has included heavy-section units from the beginning of the company's production history.
For commercial baler operators and OEM manufacturers in South Korea and Japan, Korea Ever-Power's regional supply position provides access to a 111kg gearbox within 3–7 business days for stocked configurations — versus 6–10 weeks for equivalent European OEM replacement parts arriving by sea. The total landed cost including freight from our Asia-Pacific stock positions is typically 35–50% below the equivalent European OEM replacement part price, with no reduction in specification or test standard.
Related Products for Your Baling Operation
From the Field — EP-40002 Operator Reports
Frequently Asked Questions — EP-40002
معلومات إضافية
| محرر | سي إكس إم |
|---|
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