EP-GS4RC & EP-X30 Series Rotary Cutter Gearbox – Taper Spline and Optic Axis Output Variants

★ The Output-Interface Specialists — EP-GS4RC for 30HP Taper Spline, EP-X30 Series for the Intermediate 1:1.69 Ratio and Dual Output at 30–35HP

その EP-GS4RC (30HP · 1:1.47 / 1:1.93 · M5.08/M5.0 · Z6 input · taper spline output · 19kg) fills the gap in the EP 30HP range by providing the taper spline output interface — the same hub standard used on the 60–80HP EP-RC61 そして EP-RC81 — on a compact 30HP unit. The EP-X30 series (three models: EP-01-609 at 1:1.47/35HP · EP-01-723 at 1:1.69/35HP · EP-01-611 at 1:1.93/30HP · optic axis + cone base spline output · 26.5kg) introduces the 1:1.69 intermediate ratio not available in any other 30HP EP gearbox, on the heaviest housing in the 30HP class for demanding cutting applications. Korea Ever-Power supplies both models to rotary cutter manufacturers, OEM implement builders, and agricultural machinery workshops across South Korea, Japan, and Southeast Asia.

カテゴリー: Lawn Mower Gearboxes

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Where EP-GS4RC & EP-X30 Fit — Filling the Gaps in the 30HP Rotary Cutter Range

EP-GS4RC EP-X30 series rotary cutter gearbox 30HP 35HP taper spline dual output Korea Ever-Power

EP-GS4RC (19kg) · EP-X30 series (26.5kg)

Korea Ever-Power's EP-RC31 rotary cutter gearbox covers the 30HP rotary cutter class with four ratio options and cone base aequilate spline output — the most complete single model in the 30HP tier. But two specific needs in the 30HP–35HP market are not served by the EP-RC31:

Need 1 — Taper spline output at 30HP: The EP-RC31 uses cone base aequilate spline. Rotary cutter decks that use a blade carrier hub for taper spline — the same standard as the heavier EP-RC61 and EP-RC81 — cannot mount directly to the EP-RC31 output. The EP-GS4RC solves this with a 30HP unit whose output is a clean taper spline, matching the blade carrier hub standard of the larger cutter gearboxes and enabling 30HP machines to use the same blade carrier hardware as 60–80HP machines.

Need 2 — The 1:1.69 intermediate ratio: The EP-RC31's four ratios jump from 1:1.47 to 1:1.93 with no option between them. For rotary cutter designs where the optimal blade speed sits between these two values — approximately 320RPM blade shaft at 540RPM input rather than 370RPM (1:1.47) or 280RPM (1:1.93) — neither EP-RC31 configuration is precise. The EP-X30 series provides this 1:1.69 intermediate ratio (EP-01-723, 35HP), bridging the gap with a blade shaft speed of approximately 320RPM, alongside the proven 1:1.47 and 1:1.93 configurations in 35HP and 30HP versions respectively.

Replacement reference: The EP-GS4RC and EP-X30 series are engineered to match specifications of comparable Comer Industries, Bondioli & Pavesi, and Brevini rotary cutter gearboxes in the 30–35HP / 540RPM class. Korea Ever-Power is not affiliated with these brands. References are for specification matching only.

Technical Specifications — EP-GS4RC & All Three EP-X30 Models

EP-GS4RC & EP-X30 Series Rotary Cutter Gearbox Dimension

パラメータ	EP-GS4RC	EP-01-609	EP-01-723	EP-01-611
	30HP · taper spline	35HP · 1:1.47	35HP · 1:1.69 ← unique	30HP · 1:1.93
速度比	1:1.47 / 1:1.93	1 : 1.47	1 : 1.69	1 : 1.93
Teeth Count	22/15 · 23/12	15 / 22	13 / 22	15 / 29
ギアモジュール	5.08 · 5.0	5.08	5.0	4.0
定格出力	30 HP	35 HP	35 HP	30 HP
定格入力	540 RPM — all models
Blade Shaft RPM	≈ 367 / ≈ 280	≈ 367 RPM	≈ 320 RPM	≈ 280 RPM
入力シャフト	1 3/8″ Z6 spline (ISO 500) — all models
出力インターフェース	テーパースプライン	Optic axis + cone base aequilate spline
正味重量	19 kg	26.5 kg (shared housing)
ハウジング	164 × 81mm · H 165mm	98×110.75×94mm · H 163.5+84.4+135.2mm

EP-GS4RC taper spline output and EP-X30 series dual output interface engineering detail

EP-GS4RC taper spline (left) · EP-X30 optic+cone spline (right)

The EP-X30 series housing dimensions reveal a multi-section design: the drawing shows three stacked dimension values (163.5mm + 84.4mm + 135.2mm) corresponding to the gearbox housing body, the output shaft extension section, and the blade carrier mounting area respectively. The Φ50.05mm output shaft stub is notably larger in diameter than the EP-RC31's output, consistent with the 26.5kg housing's higher structural mass and the dual-interface (optic axis and cone base aequilate spline) output arrangement. At 98×110.75×94mm the EP-X30 housing cross-section is also wider in the 110.75mm dimension than the EP-RC31 (108.5mm) — a modest difference reflecting the additional material needed for the dual-output housing geometry.

The EP-GS4RC's 164×81mm footprint is strikingly asymmetric — 164mm across the housing face but only 81mm deep. This narrow-depth geometry places the input and output shafts in a more compact arrangement along the depth axis, reducing the overhang distance from the cutter deck mounting face to the blade carrier hub. For compact rotary cutter decks where housing depth is a constraint, the EP-GS4RC's 81mm depth is an advantage over wider housings in the same power class.

The EP-01-723's 1:1.69 Ratio — Filling the Gap Between 1:1.47 and 1:1.93

In the 30HP rotary cutter range, all other EP models offer 1:1.47 and 1:1.93 as standard ratio options. The step between them — from approximately 367RPM blade shaft to approximately 280RPM — is a significant jump of 87RPM in blade speed. For most applications this is fine: either higher blade speed for normal cutting or lower blade speed with more torque for heavy material. But certain rotary cutter designs are optimised for a blade speed precisely between these values:

At 1:1.47 — 367RPM blade shaft

Higher tip speed. Good for clean, fast cutting of established grass and light vegetation. Can cause excessive material scatter in confined spaces or adjacent standing crops.

At 1:1.69 — 320RPM blade shaft ← EP-01-723

Intermediate tip speed. Better discharge control than 1:1.47 while maintaining sufficient blade momentum for moderate vegetation. The preferred ratio for Korean orchard and vineyard mowing where scatter direction matters, and for compact mowers on uneven terrain where the intermediate speed reduces vibration amplitude compared to full high-speed operation.

At 1:1.93 — 280RPM blade shaft

Lower tip speed, maximum torque. For heavy brush, thick-stemmed vegetation, and rough terrain where blade impact loads are high and tip speed is less critical than cutting force.

The EP-01-723 at 1:1.69 (13/22 teeth, M5.0) achieves 320RPM from 540RPM input — the midpoint between the standard ratios. The 13/22 tooth combination at M5.0 produces this ratio with no common factors between 13 and 22, ensuring all 13 pinion teeth contact all 22 crown gear teeth in a cycling sequence that distributes wear evenly across the full tooth sets over the service life.

Taper Spline vs Cone Base Aequilate Spline — The Output Interface You Must Verify

The most important specification difference between the EP-GS4RC and the EP-X30 series (and between them and the EP-RC31) is the output shaft interface. These three interface types are not interchangeable:

Output Type	EP Model(s)	How it engages	Blade carrier compatibility
テーパースプライン	EP-GS4RC, EP-RC61, EP-RC81	Tapered shaft-to-hub; self-tightens under torque	Taper spline hub on blade carrier. Used on 60–80HP cutters and the EP-GS4RC. Not compatible with cone base or optic axis hubs.
Cone base aequilate spline	EP-X30, EP-RC31, EP-55, EP-AG135	Conical hub with equal-pitch spline; retained by nut	Cone base spline hub — the most common 30HP cutter blade carrier standard in Korean and Japanese markets.
光軸	EP-X30 series (both)	Plain round shaft; key-and-bore coupling	Plain bore hub on blade carrier or cross-shaft coupling. EP-X30 provides both optic axis and cone base simultaneously.

Before ordering — verify your blade carrier hub: Remove the blade carrier from the existing gearbox and inspect the hub bore. A tapered bore with spline ridges = taper spline → order EP-GS4RC. A cone-shaped bore with equal-pitch splines retained by a central nut = cone base aequilate spline → order EP-X30 series or EP-RC31. A plain round bore with a keyway = optic axis → order EP-X30 series (using the optic axis side). If the bore type is not clear from inspection, contact Korea Ever-Power with measurements and photos — we will identify the correct gearbox before you order.

Full 30–35HP EP Rotary Cutter Range — Complete Selection Guide

モデル	HP	Ratios	出力インターフェース	重さ	Key differentiator
EP-RC31	30–40	4 (incl. 1:1 & 1:2.3)	Cone base aequilate spline / Optic	24.5キロ	Most ratio options — 4 choices including 1:1 direct drive and 1:2.3 deepest
EP-GS4RC ← this page	30	1:1.47 / 1:1.93	Taper spline only	19 kg	Only 30HP EP model with taper spline output — matches 60–80HP blade carrier standard
EP-X30 series ← this page	30–35	1:1.47 / 1:1.69 / 1:1.93	Optic axis + Cone base spline (dual)	26.5キロ	Only EP model with 1:1.69 intermediate ratio; heaviest 30HP housing
EP-RC51	30	1:1.47 / 1:1.93	Spline / Taper spline	29 kg	Heaviest 30HP unit — see EP-RC51 product page

Decision logic: need taper spline output at 30HP → EP-GS4RC. Need the 1:1.69 intermediate ratio → EP-X30 (EP-01-723). Need maximum ratio choice (4 options) → EP-RC31. Need highest structural mass at 30HP → EP-RC51.

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The EP-X30 Series — Three Models, One Housing, Complete Ratio Coverage

The three EP-X30 models share the same 26.5kg housing and output interface (optic axis + cone base aequilate spline). Only the internal gear set changes between models:

EP-01-609 · 1:1.47 · 35HP

15/22 teeth · M5.08 · ≈ 367 RPM blade shaft

Highest blade shaft speed in the EP-X30 series — 367RPM for fast cutting of established grass and light brush. The M5.08 module at 35HP provides the tooth bending strength for the higher output torque at the 1:1.47 lower reduction ratio. Choose EP-01-609 when maximum blade speed is required within the 30–35HP power class and the blade carrier hub accepts cone base spline or optic axis connection.

EP-01-723 · 1:1.69 · 35HP

13/22 teeth · M5.0 · ≈ 320 RPM blade shaft ← unique

The unique intermediate ratio available only in the EP-X30 series — 320RPM blade shaft speed from 540RPM input. The 13/22 tooth set at M5.0 provides the intermediate reduction with a tooth combination that has no common factors above 1, ensuring full wear distribution. At 35HP, this model carries a slightly higher power rating than the other two in the series, making it the specification for 32–35HP compact tractors running at the intermediate blade speed.

EP-01-611 · 1:1.93 · 30HP

15/29 teeth · M4.0 · ≈ 280 RPM blade shaft

Lowest blade shaft speed in the series — 280RPM for maximum torque at the blade. The M4.0 module at 1:1.93 handles the lower output speed's contact loading with a smaller but adequate tooth section in the larger 26.5kg housing. Choose EP-01-611 when maximum cutting torque is needed at 30HP — heavy brush, thick stems, or rough terrain where blade momentum matters more than speed. The heavier EP-X30 housing provides additional structural margin over the EP-RC31 for shock-load-intensive conditions.

Construction Quality

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EP-GS4RC: Taper Spline at 30HP

The taper spline output self-tightens under the asymmetric load cycles of rotary cutting — important at 30HP where the blade alternates between loaded (stem contact) and unloaded (between stems) states many times per second. This cycling prevents the progressive hub loosening that develops at non-tapered spline interfaces under similar cyclic loading. The same taper spline geometry is used on the EP-RC61 (60HP) and EP-RC81 (80HP), so a 30HP machine equipped with the EP-GS4RC can use the same blade carrier hardware as 60–80HP machines without any hub adapter.

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EP-X30: Heaviest 30HP Housing (26.5kg)

At 26.5kg, the EP-X30 housing is 8% heavier than the EP-RC51 (the next heaviest 30HP unit at ~29kg... actually the EP-X30 at 26.5kg is lighter than EP-RC51 at 29kg, but heavier than EP-RC31 at 24.5kg). The additional wall mass compared to the EP-RC31 provides greater rigidity for the dual-output housing geometry — maintaining bearing alignment under the higher moments that arise when blade carrier forces act on the housing through the longer Φ50.05mm output shaft compared to the EP-RC31's output stub.

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GGG50 Nodular Iron — Both Models

Both EP-GS4RC and EP-X30 series use GGG50 nodular cast iron housings — the same material specification used across the EP series from the lightest rotary cutter gearboxes through the EP-40002 heavy baler unit. At 30–35HP, the micro-elastic deformation capacity of GGG50 protects the housing from the intermittent blade-to-rock and stump impact events that are routine in Korean orchard and farm-boundary mowing operations.

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100% Load Test — All Models

Every EP-GS4RC and EP-X30 series unit is bench-tested at rated load (30HP or 35HP as appropriate) at the ordered ratio configuration before dispatch. For the EP-GS4RC (two ratio configurations), the test is run at the ordered ratio. For EP-X30 (three models sharing one housing), each model's specific gear set is tested under its rated conditions — the EP-01-723's 1:1.69 gear dynamics are tested at the intermediate speed, not interpolated from tests at adjacent ratios. All gears are carburised to HRC 58–62 tooth face hardness, consistent with the full EP rotary cutter series specification.

Where EP-GS4RC & EP-X30 Series Are Used

🍎 Orchard Rotary Mowing — EP-01-723 Intermediate Speed

Korean apple orchards in Chungbuk and North Gyeongsang and Japanese citrus and grape orchards in Ehime and Yamanashi use compact 30–35HP tractors with 1.0–1.4m rotary cutters for orchard floor management. The intermediate 320RPM blade shaft speed of the EP-01-723 (1:1.69) is preferred in these settings because it reduces grass scatter away from tree rows — an issue with the higher 367RPM speed of the 1:1.47 ratio — while maintaining sufficient blade momentum for the mixed grass and herbaceous cover typical of managed orchard floors. This is the primary application that drove the development of the 1:1.69 ratio option in the EP-X30 series.

🌿 Compact Rotary Cutter OEM — Taper Spline Platform Alignment

Korean OEM compact rotary cutter manufacturers who build a product range spanning 30HP to 80HP often want to use a single blade carrier hub standard across their entire range — simplifying the blade carrier BOM and spare parts kit. Because the 60HP EP-RC61 and 80HP EP-RC81 both use taper spline output, an OEM building a 30HP model alongside these larger units would need a different blade carrier for the 30HP machine if using the EP-RC31 (cone base spline). The EP-GS4RC's taper spline output at 30HP eliminates this inconsistency — one blade carrier hub standard, three power tiers (30, 60, 80HP), all taper spline.

🔧 Workshop Replacement — Interface-Specific Matching

Agricultural machinery workshops replacing a failed 30HP rotary cutter gearbox must match the output interface of the original unit — substituting a different output type changes the blade carrier and potentially the entire output-side drive coupling, turning a straightforward gearbox replacement into a larger, more expensive repair. Workshops that stock EP-GS4RC (taper spline), EP-X30 (cone base / optic axis), and EP-RC31 (cone base / optic axis) cover all three 30HP output interface types that appear across Korean and Japanese compact rotary cutters, without stocking duplicate gearboxes.

🌴 Southeast Asian Farm Boundary & Plantation Mowing

Vietnamese, Thai, and Philippine farm operations using 30–35HP compact tractors for farm boundary maintenance and inter-row vegetation management in plantation crops (palm, rubber, cassava) specify the EP-X30 series where the dual output interface covers the varied cross-shaft coupling standards used across the locally assembled compact rotary cutter designs in these markets. Korea Ever-Power's 5–7 day delivery to Southeast Asia makes the EP-GS4RC and EP-X30 series practical replacement items for the growing base of Korean-export compact cutters operating in the region.

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Why Rotary Cutter Manufacturers Choose Korea Ever-Power

agricultural gearbox workshop 1 Same CNC gear hobbing as EP-RC61 and EP-RC81 heavy-duty series

Korea Ever-Power Agricultural Machinery Co., Ltd. produces the EP-GS4RC and EP-X30 series on the same CNC gear hobbing equipment used for the 60–80HP EP-RC61 and EP-RC81 series. The output shaft geometry of the EP-GS4RC is machined to the same dimensional tolerances as the EP-RC61 and EP-RC81 taper spline outputs, ensuring blade carrier hubs intended for either the larger or the smaller model will fit correctly without modification. This manufacturing continuity between 30HP and 80HP taper spline outputs is a direct product of Korea Ever-Power's integrated production approach — all taper spline outputs in the EP range are produced on the same tooling and to the same tolerance specification.

For Korean rotary cutter OEM manufacturers and agricultural workshops, Korea Ever-Power's 3–5 business day delivery and 35–55% pricing advantage below European OEM equivalents provide a practical supply advantage that compounds across a multi-SKU product relationship. Stocking EP-GS4RC, EP-X30, and EP-RC31 from a single supplier — with 3–5 day replenishment — is operationally simpler than managing multiple European OEM accounts with 4–8 week lead times.

✔ Taper spline machined to same spec as EP-RC61/RC81

✔ EP-01-723: unique 1:1.69 ratio tested at intermediate speed

✔ 100% load test — all models at rated configuration

✔ 3–5 day dispatch to Korea & Japan; 5–7 days SEA

✔ OEM: blade carrier hub standardisation across 30–80HP

✔ 19 years manufacturing — >95% export, RCEP compliant

Related Products — EP Rotary Cutter Range

EP-RC31 — 30–40HP, 4 Ratio Options

Maximum ratio flexibility — four choices including 1:1 direct drive and 1:2.3 deepest reduction; cone base aequilate spline / optic axis output; 24.5kg. The standard recommendation for 30HP rotary cutter applications where output interface compatibility with the EP-GS4RC or EP-X30 taper/dual types is not required. See the EP-RC31 product page.

EP-RC61 / EP-RC61T — 60HP Taper Spline

The next power tier above the EP-GS4RC sharing the same taper spline output standard — 60HP, 2 or 4 ratio options, 33.5–36.5kg. OEM manufacturers using EP-GS4RC at 30HP can pair with the EP-RC61 at 60HP for a taper spline-consistent product range. See the EP-RC61 product page.

🌿 Full Lawn Mower Gearbox Range

Browse the complete 芝刈り機のギアボックス range — EP-55, EP-RC31 through EP-RC81, LF series, and the full GS4RC/X30 selection — for all rotary cutter and disc mower input gearbox requirements across 20HP to 80HP.

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What Customers Say

Im Dong-hyun Rotary Cutter OEM Manufacturer · Changwon, South Gyeongsang, South Korea · 2024

We build rotary cutters from 30HP to 80HP for domestic sale and Middle East export. Standardising on this blade carrier type hubs across the entire range was a design goal I've had for three years — but the 30HP tier was always the blocker because no Korean supplier had a taper spline 30HP unit. When we found the EP-GS4RC, that problem was solved. Same blade carrier across 30HP, 60HP, and 80HP machines — one hub design, one spare parts kit template. Our bill of materials simplified significantly. Korea Ever-Power delivers in 4 days. We have been specifying EP-GS4RC in production for 9 months with zero quality issues.

Kimura Tatsuya Orchard Equipment Dealer · Wakayama Prefecture, Japan · 2024

I supply equipment to citrus and ume orchards in Wakayama. My customers have been asking for a mowing gearbox that doesn't scatter cut grass onto the fruit trees — the 1:1.47 ratio on the EP-RC31 throws material too widely in a 4m-wide row. I specified the EP-01-723 (1:1.69) on three test machines this season. The intermediate blade speed at 320RPM reduced scatter noticeably compared to the 1:1.47 units they replaced — confirmed by two of my three customers independently. No issues with the gearboxes themselves after the full summer season. This ratio option is genuinely different from what was previously available.

Bae Sung-hyeon Agricultural Machinery Workshop · Iksan, North Jeolla, South Korea · 2024

I service compact rotary cutters for farm-boundary and orchard maintenance customers in Iksan. My stock used to be just EP-RC31. But I had two repairs where the original gearbox had a taper spline output — fitting an EP-RC31 would have required changing the entire blade carrier assembly, adding significant cost for the customer. When I learned about the EP-GS4RC, I ordered one unit as a trial. Fitted it on the next taper-spline cutter that came in — direct replacement, same interface, no carrier change needed. I now stock both EP-GS4RC and EP-RC31 for the 30HP tier. Korea Ever-Power turnaround is 4–5 days, which is the only timeline that works for a repair shop in the mowing season.

Rattanakorn Sirisuk Agricultural Equipment Dealer · Nakhon Si Thammarat, Thailand · 2025

I supply compact rotary cutter parts for rubber and palm plantation inter-row management in southern Thailand. My customers' 30–35HP compact tractors run the full range from European-spec taper-spline cutters to locally assembled cone base spline machines. Previously I had to stock two gearbox types and sometimes got it wrong. The EP-GS4RC and EP-X30 series from Korea Ever-Power together cover both standards clearly, with the output interface stated upfront. Four units of mixed EP-GS4RC and EP-01-609 delivered to Nakhon Si Thammarat in 7 days. All fitted correctly. I will consolidate my 30–35HP cutter gearbox supply to Korea Ever-Power exclusively.

よくある質問

Can the EP-GS4RC use the same blade carrier hub as the EP-RC61 (60HP)?

Yes — both use taper spline to the same geometric standard. A blade carrier hub designed for the EP-RC61 taper spline will fit the EP-GS4RC, and vice versa, provided the hub bore taper angle and spline dimensions are consistent with the taper spline standard used across the EP series. This dimensional compatibility is verified by Korea Ever-Power as part of the output shaft machining quality control. For OEM customers wanting to confirm compatibility before committing to a multi-model taper spline programme, contact Korea Ever-Power for a dimensional drawing of the output shaft geometry for direct comparison.

Which EP-X30 model should I order if my existing gearbox shows 1:1.69 ratio but no model number?

Order EP-01-723. The 1:1.69 ratio is unique to the EP-01-723 in the EP-X30 series — it is the only EP model at any power class that uses this ratio. Verify by measuring input and output shaft speeds at any convenient tractor PTO speed with a tachometer: output/input should equal approximately 1.69 (e.g. at 400RPM PTO input, output should be approximately 676RPM). If the ratio measurement confirms 1:1.69, EP-01-723 is the correct replacement.

What are the EP-X30 series housing dimensions and do the three models differ dimensionally?

All three EP-X30 models (EP-01-609, EP-01-723, EP-01-611) use the same 26.5kg housing — 98×110.75×94mm cross-section, multi-section height of 163.5mm + 84.4mm + 135.2mm, Φ50.05mm output shaft. The only difference between the three models is the internal gear set. The mounting bolt pattern, housing footprint, output shaft dimensions, and overall envelope are identical across all three. A cutter deck frame designed for any one EP-X30 model accepts the other two without modification.

What gear oil and maintenance interval apply?

SAE 90 GL-4 gear oil — approximately 300–350ml (EP-GS4RC) and 400–450ml (EP-X30 series, larger housing). Both units ship without oil; fill before first operation. First oil change at 50 hours; subsequent changes every 200 hours or at the start of each mowing season. Clear any vegetation accumulation from around both shaft exits after each mowing session to protect the shaft seals from accelerated wear caused by grass-fibre wrapping.

What warranty and shipping apply?

12-month warranty from dispatch against manufacturing defects — housing integrity, gear failure within rated HP, bearing failure not caused by oil neglect, and seal defects at delivery. Not covered: operation above rated HP, oil neglect, dry running, or blade carrier hub incompatibility causing output shaft damage. Shipping: DHL or FedEx, 3–5 days to Korea and Japan, 5–7 days to SEA for 1–10 units. Sea freight for larger orders (10–18 days). Full export documentation including Certificate of Origin for RCEP and ASEAN preferential tariff applications on every shipment.