EP-BGB9 Four-Ratio Lawn Mower Gearbox & EP-9.259 Speed Increaser – 30HP Specialist Pair

EP-BGB9 Four-Ratio Lawn Mower Gearbox 1

★ Two 30HP Specialists — EP-BGB9 for the Widest Ratio Coverage in One Housing, EP-9.259 for Speed Increase Where PTO Speed Is Not Enough

这 EP-BGB9 (30HP · four ratios: 1:1 · 1:1.35 · 1:1.46 · 1:2 · M6.35/5.0/5.0/3.5 · dual Z6 input/output · 23kg) offers the widest ratio range of any 30HP EP gearbox in a single housing — from equal-speed direct drive to 2:1 speed reduction, covering every mowing and light implement drive requirement between those extremes. The EP-9.259 (30HP · 1.46:1 speed increase · M5.0 · 19/13 teeth · Z6 · optic axis · 14kg) does the opposite of a conventional mower gearbox: instead of slowing the PTO down, it speeds it up — delivering approximately 788RPM from 540RPM input, serving compact mower and implement designs where the cutting mechanism requires above-PTO-speed drive. Korea Ever-Power supplies both models to lawn mower manufacturers, specialist implement builders, and agricultural machinery workshops across South Korea, Japan, and Southeast Asia.

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EP-9.259 — The 30HP Lawn Mower Speed Increaser

EP-BGB9 Four-Ratio Lawn Mower Gearbox & EP-9.259 Speed Increaser gearbox

EP-9.259 · 1.46:1 speed increase · 14kg · 30.08° mount angle

The EP-9.259 is one of two speed increasers in the EP range — the other being the EP01-672 baler speed increaser gearbox (50HP baler speed increaser). The EP-9.259 serves the 30HP lawn mower class specifically, where its 1.46:1 ratio converts 540RPM PTO input to approximately 788RPM output — well above the PTO speed and well-matched to compact rotary mower blade disc designs that achieve optimal cutting tip speed at approximately 780–800RPM.

The 30.08° mounting angle built into the EP-9.259's housing geometry is the key dimensional detail that distinguishes it from a generic speed increaser. Rather than mounting perpendicular to the tractor's horizontal PTO axis, the EP-9.259 is angled downward at approximately 30°, directing the output shaft toward the cutting deck below. This eliminates an intermediate universal joint or angle bracket between the gearbox and the blade shaft, reducing drive line components, cost, and the maintenance burden of an additional pivot point in the implement drive chain.

At 14kg, the EP-9.259 is the lightest single-shaft gearbox in the 30HP EP lawn mower range — appropriate for the compact deck frames of sub-compact tractors and walk-behind tractor mowing attachments where total implement frame mass is tightly constrained. The 84×84mm square housing footprint provides a stable two-axis mounting surface despite the compact dimensions.

Speed increaser torque note: In the EP-9.259, output torque is lower than input torque — at 1.46:1 speed increase, output torque ≈ input torque ÷ 1.46, approximately 68% of input. This is correct for blade disc mower applications where the cutting mechanism needs high RPM at moderate torque, not the high torque and low RPM of a speed reducer. Do not use the EP-9.259 as a replacement for a speed-reducing gearbox: the output torque will be insufficient to drive a mechanism designed for speed-reducer output loads, resulting in stalling under load.

Technical Specifications — EP-BGB9 & EP-9.259

EP-BGB9 Four-Ratio Lawn Mower Gearbox & EP-9.259 Speed Increaser gearbox Dimension

范围 EP-BGB9 EP-9.259
Speed Function 4 ratios — direct drive through reduction Speed increase only ← unique
比例期权 1:1 · 1:1.35 · 1:1.46 · 1:2 1.46 : 1
Teeth Count 16/16 · 23/17 · 22/15 · 15/30 19 / 13
齿轮模块 6.35 · 5.0 · 5.0 · 3.5 (per ratio) 5.0
额定功率 30 HP — both models
额定输入速度 540 RPM — both models
Output RPM (at 540) 540 · 400 · 370 · 270 RPM ≈ 788 RPM (above PTO speed)
输入轴 1 3/8″ Z6 (both input and output) 1 3/8″ Z6
输出轴 Optic axis (Z6 on opposite side) 光轴
Housing Dimensions 101.5 × 101.5 × 96 mm · H 156 mm 84 × 84 mm · H 136 mm · 30.08° mount
房屋材料 GGG50 nodular cast iron — both models
净重 23 kg 14公斤

农业齿轮箱-1

The EP-BGB9's dual Z6 interface — Z6 on both input and output — is a distinctive feature shared with the EP-BGB8 round baler gearbox. Unlike the EP-BGB8 (which uses identical Z6 sockets), the EP-BGB9 has Z6 for PTO shaft input on one side and a Z6 spline shaft output on the opposite side with optic axis output on the top face — three interface points in a single housing. This geometry reflects the BGB series design for mowing implements where the implement cross-shaft and the blade spindle drives may connect from different faces of the gearbox.

The EP-9.259's 30.08° mounting angle in the engineering drawing is a non-zero installation angle — the gearbox is designed to mount on the implement frame at approximately 30° from horizontal, with the output shaft axis angled to direct the blade disc or cutting reel shaft into the correct working position below the implement deck. This integrated mounting angle eliminates the need for a separate angle bracket, reducing parts count and potential misalignment points in the drive system.

EP-BGB9 — Four Ratios, One Housing, the Full Mowing Speed Range

The EP-BGB9 covers a wider ratio range in a single housing than any other 30HP EP gearbox. Four gear sets within the same 101.5×101.5×96mm square housing deliver four distinct output speeds from 540RPM PTO input:

EP-BGB9 Four-Ratio Lawn Mower Gearbox 1

1:1 · M6.35 · 16/16

Output = 540 RPM · Direct drive

Equal speed 90° direction change. M6.35 — the coarsest module in the EP-BGB9 — is required because at 1:1 the output gear carries the full input torque with no mechanical advantage. The 16/16 equal tooth arrangement changes drive direction without altering speed or torque.

1:1.35 · M5.0 · 23/17

Output ≈ 400 RPM · Moderate reduction

35% speed reduction — the output disc or blade shaft slows to 400RPM, increasing torque proportionally. Used when the mower design targets 380–420RPM blade speed for light-to-medium grass in Korean orchard floors and roadside verges.

1:1.46 · M5.0 · 22/15

Output ≈ 370 RPM · Standard mowing

The standard mowing ratio used across the EP rotary cutter range. At 370RPM, blade disc tip speed is appropriate for established grass cutting and pasture maintenance on compact 30HP tractors. This ratio aligns with the EP-RC31 1:1.46 configuration.

1:2 · M3.5 · 15/30

Output = 270 RPM · Deep reduction

Maximum torque at lowest speed — 270RPM for heavy brush cutting, thick-stemmed vegetation, and rough-terrain mowing where blade momentum matters more than cutting speed. M3.5 for the 30-tooth crown gear where the fine pitch accommodates the large 2:1 gear ratio within the 101.5mm housing constraint.

Why four different modules across four ratios? Each ratio configuration operates under different tooth loading conditions. The 1:1 direct drive carries the highest output torque per tooth (full input torque, no mechanical advantage) — requiring M6.35 for adequate tooth root bending strength. The 1:2 deep reduction carries the highest torque multiplication (2× input torque at the output), but the 30-tooth crown gear distributes this load across more simultaneous tooth contacts, allowing M3.5 to remain within fatigue limits. The two intermediate ratios (1:1.35 and 1:1.46) share M5.0 as the calculated optimum for their intermediate torque levels within the 101.5mm housing pitch diameter constraint.

EP-BGB9 vs EP-BGB8 — key differences: The EP-BGB8 (18kg, 2 ratios: 1:1 and 1:1.67 speed increase) is a baler drive gearbox — its second ratio is a speed increase. The EP-BGB9 (23kg, 4 ratios: 1:1 through 1:2) is a mowing implement gearbox — all four ratios are direct drive or reductions, not speed increases. Both use dual Z6 interfaces. Choose EP-BGB9 for mowing and implement drives requiring ratio selection across the 1:1 to 1:2 range; choose EP-BGB8 for compact baler applications needing a 1:1.67 speed increase option.

 

Speed Increase vs Speed Reduction — Where EP-9.259 Fits in the EP 30HP Lawn Mower Range

Every other EP lawn mower gearbox reduces speed from PTO input. The EP-9.259 is the only 30HP EP lawn mower gearbox that increases speed. This difference in function places it in a distinct subset of the range:

模型 惠普 Speed function Output RPM (from 540) Primary use
EP-RC31 30–40 Reduce 235–370 RPM Standard rotary cutter, 4 ratio options
EP-BGB9 ← this page 30 Direct + Reduce 270–540 RPM Multi-speed mowing, widest ratio coverage
EP-9.259 ← this page 30 Increase ← only one ≈ 788 RPM Compact disc mowers requiring above-PTO blade speed

The EP-9.259 is the only gearbox in the EP 30HP lawn mower range where the output shaft turns faster than the input. If your mower deck was designed for a speed-increasing input gearbox and you specify a speed-reducing model, the blade disc will spin at 35–69% of design speed — the mowing quality will be poor and the grass will not be cut cleanly. Confirm the speed function (increase or reduce) of your existing gearbox before ordering a replacement.

Construction Quality

⚙️

EP-BGB9: Four Modules, One Housing — Precision Requirement

Producing four gear sets (M6.35, M5.0, M5.0, M3.5) to fit the same 101.5mm square housing while sharing the same bearing seat positions requires that each gear set's pitch diameter be engineered to use the available housing bore clearance without interference. Korea Ever-Power produces all four gear sets on the same CNC gear hobbing equipment, ensuring consistent tooth profile accuracy across the module range. The M6.35 gear set — the coarsest in the EP BGB range — requires the largest tooth form and has the least clearance within the housing bore; its hobbing accuracy is verified by contact pattern inspection during the 30HP load test.

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EP-9.259: 30° Mounting Angle — Machined-In Precision

The EP-9.259's 30.08° mounting angle is machined into the housing casting — not a field-adjustable feature or an attachment angle set by a bracket. The 30.08° angle is precise to two decimal places, corresponding to the calculated shaft angle that places the output shaft at the correct geometry for the standard Korean and Japanese compact rotary mower blade shaft position relative to the tractor PTO axis. This machined-in angle means the implement frame designer uses the gearbox's own geometry to set the drive angle, without measuring and setting an adjustable bracket.

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Speed Increaser Bearing Spec — EP-9.259

At 788RPM output — 46% above PTO input — the EP-9.259's output shaft bearing operates at a higher rotational speed than the input bearing. The output bearing is specified for its dynamic load rating (C) at 788RPM rather than for the lower-speed static load characteristic of typical speed-reducing gearbox output bearings. Angular contact ball bearings at the output position handle the combined radial and axial loads from the 1.46:1 speed-increase bevel mesh at 30HP and 788RPM, maintaining bearing temperature within the rated range during sustained operation.

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100% Load Test — Both Models

Every EP-BGB9 is bench-tested at 30HP at the ordered ratio configuration. Every EP-9.259 is tested at 30HP with the output shaft loaded at 788RPM. For the EP-9.259 specifically, the load test verifies that the output bearing temperature stays within the rated range at the 788RPM operating speed — the critical parameter for a speed increaser where bearing heat generation at the higher output speed is the primary service life driver. Both models use carburised HRC 58–62 gears, consistent with the full EP series standard.

agricultural gearbox features 1

Where EP-BGB9 & EP-9.259 Are Used

⚙️ EP-BGB9 — Multi-Speed Mowing Platform, One Gearbox SKU

Korean compact mower manufacturers building machines for orchard floor management, roadside verge cutting, and mixed-vegetation lawn maintenance specify the EP-BGB9 for its four-ratio flexibility — a single gearbox SKU that allows the OEM to offer four blade speed settings without changing the gearbox model. A 1.0m compact mower with EP-BGB9 can be sold in a 1:1.46 standard grass cutting configuration and a 1:2 heavy brush configuration by changing only the gear set at the time of assembly, without retooling the frame, deck, or blade carrier hardware. For dealers and workshops, stocking one EP-BGB9 model covers the four most commonly needed mowing speeds at 30HP, reducing the number of gearbox variants on the shelf.

⬆️ EP-9.259 — Compact Disc Mowers Requiring Above-PTO Blade Speed

Certain compact rotary disc mower designs operating on 25–35HP tractors require blade disc speeds of 750–820RPM for the specific cutting geometry and material discharge pattern they are designed for. At 540RPM PTO input, a standard speed-reducing input gearbox cannot deliver this — the blade speed will always be below PTO speed. The EP-9.259 solves this by delivering 788RPM output from 540RPM input, directly matching the design speed range of these compact disc mower mechanisms. Japanese orchard floor mowers using high-speed small-diameter blade discs for fine grass management and Korean compact highway median mowers designed for rapid grass clearance at minimum pass count are typical EP-9.259 applications.

🔧 Workshop Replacement — Confirming Increaser vs Reducer Before Ordering

Agricultural machinery workshops replacing a failed input gearbox on a compact mower must verify whether the original unit was a speed increaser or speed reducer before ordering. The fastest field verification method: engage the mower PTO at low throttle (approximately 400RPM) and measure input and output shaft speeds with a tachometer or reflective sticker method. If the output shaft turns faster than the input — the gearbox was a speed increaser; order EP-9.259. If the output shaft turns slower — a speed reducer; order from the EP-RC31, EP-BGB9, or EP-GS4RC range as appropriate. Korea Ever-Power's technical team can confirm the correct model from the original gearbox's housing markings or dimensions if a tachometer measurement is not feasible.

lawn mower gearboxes application 1

Why Lawn Mower Manufacturers Choose Korea Ever-Power

Korea Ever-Power lawn mower gearbox EP-BGB9 EP-9.259 CNC production M6.35 speed increaser

M6.35 direct drive and 1.46:1 speed increaser — same CNC production line

Korea Ever-Power Agricultural Machinery Co., Ltd. produces both the EP-BGB9's four gear sets and the EP-9.259's speed-increase gear set on the same CNC gear hobbing equipment used across the EP lawn mower series. The M6.35 module — the coarsest in the BGB9 range — and the M5.0 speed-increase set of the EP-9.259 are produced to the same tooth profile accuracy standard, with HRC 58–62 surface hardening applied regardless of module size. Korea Ever-Power's production capability for non-standard speed-increasing gearboxes (EP-9.259 and EP01-672) reflects 19 years of experience producing both conventional and specialist drive configurations for the Asian agricultural market.

✔ EP-BGB9: 4 modules (M6.35/5.0/5.0/3.5) on one CNC line
✔ EP-9.259: 30.08° mounting angle precision-machined
✔ 100% load test — EP-9.259 at 788RPM actual output speed
✔ 3–5 day dispatch to Korea & Japan; 5–7 days SEA
✔ Speed increaser expertise — EP-9.259 and EP01-672
✔ 19 years manufacturing — >95% export, RCEP compliant

相关产品

EP-RC31 — 30–40HP, 4 Ratios (Reduce)

The standard 30HP multi-ratio speed reducer for rotary cutters — four reducing ratios (1:1.46 through 1:2.3), cone base spline + optic output, 24.5kg. For rotary cutter applications where speed reduction and the cone base spline output standard are required. See the EP-RC31 page.

EP01-672 — 50HP Speed Increaser (Baler)

The 50HP speed increaser for baler auxiliary drives — 1.92:1 and 1.47:1 speed increase, M6.5/5.65, optic axis output, 18.5kg. The higher-power speed increaser companion to the EP-9.259. See the EP01-672 page for the baler application context.

🌿 Full Lawn Mower Range

Browse the complete 割草机变速箱 range — EP-55, EP-RC31 through EP-RC81, LF series, GS4RC, X30, BGB9, and EP-9.259 — for all rotary mower drive requirements from 20HP to 80HP.

动力输出轴-1

 

Frequently Asked Questions — EP-BGB9 & EP-9.259

EP-BGB9: why does the 1:1 direct-drive ratio use M6.35 — a coarser module than the other three ratios?

At 1:1 there is no torque multiplication — the output gear carries exactly the input torque with no mechanical advantage from gear ratio. The 16-tooth output gear bears this full input torque load at every mesh contact. At 30HP and 540RPM, the input torque is approximately 397 Nm. Divided across approximately 2–3 simultaneously meshing teeth at M6.35, this produces a tooth root bending stress that M6.35 handles within the HRC 58–62 fatigue limit. The next ratio (1:1.35, M5.0) has a 17-tooth driven gear carrying 30% lower torque (input torque ÷ 1.35) — a smaller load that the more compact M5.0 cross-section handles adequately. The module choice follows the torque, not the ratio number.

EP-9.259: how do I confirm my mower needs a speed increaser rather than a speed reducer?

Three methods: (1) Check the original gearbox housing for a ratio marking — a ratio above 1:1 with the first number larger than 1 (e.g. "1.46:1") is a speed increaser; with the second number larger (e.g. "1:1.46") it is a speed reducer. (2) Tachometer measurement at any PTO speed — if the output shaft turns faster than the input, it is a speed increaser. (3) Inspect the gear tooth count — in a speed increaser the pinion (driving gear) has more teeth than the crown gear (driven gear); in a speed reducer the pinion has fewer teeth. For the EP-9.259, the 19-tooth pinion drives the 13-tooth crown: 19 > 13, confirming speed increase. Contact Korea Ever-Power with the original gearbox dimensions or markings if any of these methods is inconclusive.

What oil specification and maintenance interval apply?

Both models: SAE 90 GL-4 gear oil. Approximate fill volumes: EP-BGB9 ≈ 300–350ml; EP-9.259 ≈ 150–180ml (compact 84mm housing). Both 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. For the EP-9.259, check housing surface temperature at 100 hours of operation in summer conditions — if above 70°C, reduce the oil change interval to 150 hours. The 788RPM output speed generates more heat per unit time than a speed-reducing gearbox at the same power level, making the EP-9.259's thermal management slightly more demanding than standard EP lawn mower gearboxes.

What warranty and shipping apply?

12-month warranty from dispatch against manufacturing defects — both models. Not covered: operation above 30HP, oil neglect, dry running before initial fill. EP-9.259 specific: using the speed increaser as a speed reducer replacement (output torque insufficient for speed-reducer loads). Shipping: DHL or FedEx, 3–5 days Korea and Japan, 5–7 days SEA for 1–10 units; sea freight for larger orders (10–18 days). Full export documentation including Certificate of Origin for RCEP and ASEAN tariff applications on every shipment.

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