EP-HC-RC31 Rotary Cutter Gearbox – 30–40HP Multi-Ratio Series
★ One Platform, Three Ratio Options — The 30–40HP Rotary Cutter Gearbox Built for Real Field Conditions
这 EP-RC31 is Korea Ever-Power’s most versatile rotary cutter gearbox series in the 30–40HP class. Three variants cover ratios from 1:1.47 to 1:2.3, with a fixed-ratio model for standard replacement jobs and a four-speed model for mixed-terrain mowing where output speed flexibility matters. All share the same 1 3/8″ Z6 PTO input, nodular cast iron housing, quenched bevel gears, and cone-base spline shaft output — fitting the widest range of rotary mower and brush cutter decks sold across South Korea, Japan, Vietnam, and the broader Asia-Pacific region. Net weight from 21.5 to 24.5 kg, 100% load-tested before shipping.
EP-RC31 Rotary Cutter Gearbox Series — Overview
EP-RC31 · 30–40HP · Ratios 1:1.47–1:2.3 · from 21.5 kg
这 EP-RC31 rotary cutter gearbox series covers the 30–40HP bracket that accounts for the largest share of PTO-driven mower installations across South Korea and Japan. Compact tractors in this power range — Daedong CX series, LS XR, TYM T series, Kubota M, Yanmar YT — are the backbone of Korean and Japanese small-farm operations, and the EP-RC31 is sized precisely for them.
Three model variants are available within this series, each sharing the same housing footprint, mounting bolt pattern, and 1 3/8″ Z6 PTO input standard, but differing in gear ratio and output speed. This means a workshop can stock one mounting template and one PTO shaft configuration, then select the appropriate ratio variant based on the deck type and vegetation conditions. The fixed-ratio models (EP-RC31-193 at 1:1.93 and EP-RC31-147 at 1:1.47) are the common replacement choices for mowers with a specified blade speed requirement. The multi-ratio variant adds 1:1.46 and 1:2.3 as additional options, making it suitable for machines that operate across varying grass densities and terrain types.
The housing is cast from nodular cast iron (GGG50 ductile iron), the same material grade as the EP-55, providing the toughness to absorb blade-strike shock loads without housing fracture. All bevel gears are carburised and quench-hardened to HRC 58–62. Each unit undergoes full-load bench testing prior to dispatch. Korea Ever-Power supplies the EP-RC31 series to agricultural equipment dealers, OEM mower manufacturers, and replacement-parts workshops throughout the Asia-Pacific region.
Replacement Reference: The EP-RC31 series is engineered to match the specification of comparable Comer Industries, Bondioli & Pavesi, and Omni Gear 旋转切割机齿轮箱 models in the 30–40HP / 1:1.47–1:1.93 ratio class. Korea Ever-Power is not affiliated with or an authorised distributor of these brands. Model references are provided solely to assist customers in identifying compatible specifications and do not imply any counterfeit or infringing relationship.
Which EP-RC31 Variant Do You Need? — Series Comparison
All three variants share the same housing dimensions and PTO input. The difference lies in gear ratio, tooth module, and output shaft type. Use the table and notes below to select the right model for your application before ordering.
Quick selection tip: If you are replacing an existing gearbox, match the ratio of the original unit — use EP-RC31-193 for 1:1.93 replacements and EP-RC31-147 for 1:1.47 replacements. If you are specifying a new installation or need flexibility across multiple machine types, the 4-speed multi-ratio variant eliminates the need to stock three separate part numbers. All three share the same mounting bolt pattern, so swapping variants requires only gearbox replacement — no deck modification.
Full Technical Specifications — All EP-RC31 Variants
The table below consolidates factory-verified parameters for all three EP-RC31 variants. All data is drawn directly from the official product datasheet. The higher module value (5.08) in the 147 and 4-speed variants reflects a coarser tooth pitch engineered to handle the higher bending loads at increased power input — a deliberate choice that distinguishes this 旋转切割机齿轮箱 from lighter-duty alternatives using M3–M4 gearing throughout their range. 
| 范围 | EP-RC31-193 | EP-RC31-147 | EP-RC31 (4-Speed) |
|---|---|---|---|
| Speed Ratio(s) | 1 : 1.93 | 1 : 1.47 | 1:1.46 / 1:1.69 / 1:1.93 / 1:2.3 |
| Teeth Count | 15 / 29 | 15 / 22 | 22/15 · 22/13 · 29/15 · 28/12 |
| 齿轮模块 | 4.0 | 5.08 | 5.08 / 5.0 / 4.0 / 4.0 |
| 额定功率 | 30 HP | 40马力 | 30 HP |
| 额定输入速度 | 540 转/分 | 540 转/分 | 540 转/分 |
| 输入轴 | 1 3/8″ Z6 | 1 3/8″ Z6 | 3/8 Z6 (optic axis opt.) |
| 输出轴 | Cone-base spline | Cone-base spline | Optic axis / Taper spline |
| 房屋材料 | Nodular cast iron (GGG50) — all variants | ||
| 净重 | 24.5公斤 | 24.5公斤 | 21.5 kg |
Bevel gear and bearing arrangement — common across all EP-RC31 variants
The gear module difference between the 193 and 147 variants deserves a practical explanation. Module 4.0 on the EP-RC31-193 means smaller tooth cross-section — adequate for the 30HP load but not for 40HP. The jump to module 5.08 on the 147 variant increases tooth bending strength by approximately 60%, allowing the higher power rating while maintaining the same housing and bearing arrangement. This is not a cost-saving measure; it is a deliberate design choice made to avoid using the same gearing at different load levels — an approach that leads to premature tooth wear at the higher end of the power band.
The 4-speed variant uses mixed modules (5.08 for the lower ratios, 4.0 for the higher ratios) because at ratio 1:2.3 the reduced output speed means lower circumferential velocity at the tooth face, reducing the dynamic load component and allowing the M4.0 tooth to operate safely at 30HP. This is the same engineering logic used in multi-speed automotive transmissions, applied here to a field-service agricultural gearbox.
Gear Ratio Selection Guide — What the Numbers Mean in the Field
The ratio number printed on a 旋转切割机齿轮箱 directly determines blade tip speed. Getting this right affects both cut quality and safety. Here is what each EP-RC31 ratio delivers at 540 RPM PTO input, assuming a standard 500 mm blade radius:
| 比率 | 输出转速 | Blade Tip Speed (500mm radius) | Best Vegetation / Condition |
|---|---|---|---|
| 1 : 1.46 | ≈ 788 RPM | ≈ 41 m/s | Thick brush, high-density grass, heavy-stemmed cover crops |
| 1 : 1.47 | ≈ 794 RPM | ≈ 42 m/s | Standard pasture mowing, roadside maintenance, orchard floors |
| 1 : 1.69 | ≈ 913 RPM | ≈ 48 m/s | Mixed-height grass, sports ground renovation, light brush |
| 1 : 1.93 | ≈ 1,042 RPM | ≈ 55 m/s | Fine turf finish, manicured pasture, golf course rough |
| 1 : 2.3 | ≈ 1,242 RPM | ≈ 65 m/s | Very fine-cut finish on managed turf, low-height trimming |
Safety note: Higher ratios produce higher blade tip speeds. At 1:2.3 with a 500 mm blade, tip speed approaches 65 m/s — well above the point where blade fragment hazard increases significantly. Always verify that the mower deck and blade assembly are rated for the blade speed produced by the selected ratio before operating. Korea Ever-Power recommends confirming this with your mower manufacturer's specifications.
Construction & Material Quality
Nodular Cast Iron Housing
GGG50 ductile iron throughout. The nodular graphite microstructure gives the housing 3–4× the impact toughness of grey iron — essential for a 旋转切割机齿轮箱 that regularly encounters stone strikes and root impacts at full blade speed.
Carburised & Hardened Gears
Both bevel gears are carburised to a case depth of 0.8–1.2 mm and quench-hardened to HRC 58–62 surface hardness. This treatment resists pitting, micro-spalling, and abrasive wear under the repetitive load cycles typical of daily mowing operations.
Double-Lip NBR Oil Seals
High-quality NBR seals on all shaft exits. The secondary lip wipes dust and grit away from the bearing race on every shaft rotation, preventing the ingress-caused bearing wear that is the most common premature failure mode in field-operated gearboxes.
100% Pre-Dispatch Load Test
Every EP-RC31 unit — all three variants — is run on a calibrated test bench at full rated load before packaging. Assembly errors, bearing pre-load issues, and gear mesh problems are caught at the factory, not in the field.
Application Scenarios Across Korea, Japan & Southeast Asia
🌿 Small-Farm Pasture Management — Korea & Japan
The 30HP EP-RC31-193 matches the PTO output of compact Korean and Japanese tractors (Daedong CK, LS XR, Kubota B/M series) used on 0.5–3 ha paddy-adjacent dry fields. At a 1:1.93 ratio, output blade speed provides a clean finish on established pasture grass without the power draw that overloads smaller engines during extended mowing runs.
🚧 Roadside Verge Maintenance — Municipal Contracts
Municipal road departments in Korea's Gyeonggi, North Chungcheong, and South Gyeongsang provinces run PTO mowers on compact tractors for bi-annual roadside clearance programmes. The EP-RC31-147 (40HP, 1:1.47) is the standard specification here — sufficient torque for mixed vegetation including young woody growth, while the lower ratio provides more blade-drive torque at the cost of tip speed, ideal for the mixed-condition work typical of road verges.
🍊 Orchard & Vineyard Floor Control — Vietnam & Thailand
In Vietnam's Central Highlands coffee and pepper plantations and Thailand's durian and longan orchards, the humid subtropical climate drives rapid grass and weed growth between planting rows. The EP-RC31-193 on a 25–30HP compact tractor handles these conditions within the tight inter-row spacing typical of Southeast Asian plantation layouts, where a wider heavy-duty unit would not fit.
🏟️ Sports Turf & School Grounds — Korea
Korean education authorities and local government sports facilities use the 1:1.93 variant for high-frequency mowing of natural grass pitches (soccer, baseball, general athletics) where a clean, consistent cut at 60–80 mm height is required. The 30HP power ceiling is sufficient for the load, and the 24.5 kg weight does not add excessive compaction to natural turf surfaces.
🔧 OEM Mower Manufacturing — Multi-Ratio Builds
Several Korean and Japanese mower OEMs building machines for export specify the EP-RC31 4-speed variant as the gearbox platform for models sold into multiple markets, where local regulations or customer preferences vary blade speed requirements. One housing design, one mounting template, four ratio configurations — a significant simplification in assembly line management and spare parts inventory.
EP-RC31 vs. EP-55 — Knowing When to Step Up
The EP-RC31 and EP-55 share the same platform philosophy and material specification. The decision between them is straightforward and based on tractor power and deck width. There is no quality gap — only a size and capacity difference.
| Criterion | EP-RC31 Series | EP-55 |
|---|---|---|
| Power Range | 30–40 HP | 50 HP |
| Typical Tractor Class | 25–40HP compact tractors | 40–55HP utility tractors |
| Deck Width Match | 1.2 – 1.8 m | 1.8 – 2.2 m |
| 比例期权 | 1:1.47 / 1:1.93 / 1:1.46–1:2.3 | Fixed 1:1.6 |
| 净重 | 21.5 – 24.5 kg | 28.7 kg |
| Choose This When | Compact tractor, smaller deck, multi-ratio flexibility needed | Larger tractor, wider deck, single-ratio fixed installation |
If your tractor is in the 40–45HP range, the EP-RC31-147 (40HP rated) is typically sufficient. For 45HP and above, or decks wider than 1.8 m, the EP-55 agricultural gearbox is the more appropriate choice.
Why Agricultural Machinery Buyers Choose Korea Ever-Power
3,800 m² manufacturing floor — CNC gear machining and assembly
Korea Ever-Power Agricultural Machinery Co., Ltd. is the Asia-Pacific supply partner for precision 农业变速箱 manufactured at a facility with 19 continuous years of gear production history. Our factory operates 3,800 m² of dedicated CNC gear machining floor, employs 90 engineers and production staff, and holds annual output capacity exceeding RMB 40 million. Over 95% of production is exported — to Europe, North America, Australia, and across Asia-Pacific.
For buyers in South Korea, Japan, and Southeast Asia, Korea Ever-Power provides shorter lead times and more direct technical support than sourcing equivalent products through European distributors. We hold regional stock of the EP-RC31 series for fast dispatch, and we can provide complete export documentation — commercial invoice, packing list, Certificate of Origin, and inspection test reports — for smooth customs clearance in all major Asia-Pacific import markets.
Accessories & Compatible Drive Components
The EP-RC31 gearbox is one element in a complete rotary mower drive system. The following components are regularly ordered alongside it by Korea Ever-Power customers.
What Customers Say About the EP-RC31 Series
Frequently Asked Questions — EP-RC31 Series
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