{"id":419,"date":"2026-07-28T03:50:52","date_gmt":"2026-07-28T03:50:52","guid":{"rendered":"https:\/\/superiortransmissioninc.com\/?post_type=product&p=419"},"modified":"2026-07-28T03:50:52","modified_gmt":"2026-07-28T03:50:52","slug":"ep-12-91-ratio-13hp-540-rpm-aluminum-gearbox","status":"publish","type":"product","link":"https:\/\/superiortransmissioninc.com\/ur\/product\/ep-12-91-ratio-13hp-540-rpm-aluminum-gearbox\/","title":{"rendered":"EP-1:2.91 Ratio 13HP 540 RPM Aluminum Gearbox"},"content":{"rendered":"
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EP-1:2.91 Ratio 13HP 540 RPM Aluminum Gearbox<\/h2>\n

Model: EP-1:2.91 | Speed Reduction Agricultural Power Transmission<\/p>\n

This aluminum gearbox<\/strong> is built for agricultural implements that demand a significant speed step-down from the standard 540 RPM tractor PTO output. With a 1:2.91 reduction ratio and a rated capacity of 13 HP, it converts relatively high input shaft speed into a slower, higher-torque output that suits auger drives, forage choppers, post-hole diggers, and similar soil-engaging or material-processing equipment. The lightweight aluminium gearbox<\/strong> housing keeps overall implement weight manageable even on compact tractor three-point hitches, while the industrial-grade internal components deliver the durability that operators across North America, Europe, Australia, and South America depend on through demanding seasonal work cycles.<\/comment-tag id=”1″ text=”This aluminum gearbox<\/strong> is built for agricultural implements that demand a significant speed step-down from the standard 540 RPM tractor PTO output. With a 1:2.91 reduction ratio and a rated capacity of 13 HP, this speed reduction aluminum gearbox converts relatively high input shaft speed into a slower, higher-torque output that suits auger drives, forage choppers, post-hole diggers, and similar soil-engaging equipment. The lightweight aluminum gearbox<\/strong> housing keeps overall implement weight manageable even on compact tractor three-point hitches, while the industrial-grade internal components of this agricultural aluminum gearbox deliver the durability that operators across North America, Europe, Australia, and South America depend on when choosing an aluminum gearbox for demanding seasonal work cycles.” type=”suggestion”><\/p>\n<\/div>\n

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Technical Specifications & Parameters<\/h2>\n

The following parameter table provides the verified mechanical data for the EP-1:2.91 model. Procurement engineers and equipment designers can use these figures to confirm shaft compatibility, mounting footprint clearance, and driveline torque budgets before placing orders. All values reflect the as-manufactured specification confirmed through dimensional audit and load test procedures.<\/p>\n

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Aluminum Gearbox Parameter<\/th>\nSpecification<\/th>\nNotes<\/th>\n<\/tr>\n<\/thead>\n
Item \/ Model<\/td>\nEP-1:2.91 Aluminum Gearbox<\/td>\nSpeed reduction aluminum gearbox<\/td>\n<\/tr>\n
Gear Ratio<\/td>\n1:2.91<\/td>\nSpeed reduction, torque increase<\/td>\n<\/tr>\n
Teeth (Drive\/Driven)<\/td>\n32 \/ 11<\/td>\nBevel gear set<\/td>\n<\/tr>\n
Module<\/td>\n3.0<\/td>\nStandard gear module<\/td>\n<\/tr>\n
Rated Power<\/td>\n13 HP<\/td>\n\u2248 9.7 kW continuous<\/td>\n<\/tr>\n
Rated Input Speed<\/td>\n540 RPM<\/td>\nStandard PTO speed<\/td>\n<\/tr>\n
Output Speed (approx.)<\/td>\n~186 RPM<\/td>\n540 \u00f7 2.91<\/td>\n<\/tr>\n
Input\/Output Interface<\/td>\n1 3\/8″ Z26 Spline<\/td>\nISO 11684 \/ DIN 5480<\/td>\n<\/tr>\n
Housing Material<\/td>\nCast Aluminum Alloy<\/td>\nCorrosion-resistant, lightweight<\/td>\n<\/tr>\n
Overall Length<\/td>\n359.7 mm<\/td>\nPer dimensional drawing<\/td>\n<\/tr>\n
Flange Width \/ Height<\/td>\n86.5 \u00d7 68.4 mm<\/td>\nMounting flange section<\/td>\n<\/tr>\n
Housing Bore Width<\/td>\n168 mm<\/td>\nOuter housing dimension<\/td>\n<\/tr>\n
Bolt Circle \/ Centers<\/td>\n108 mm (4 \u00d7 \u03a611 holes)<\/td>\nMounting bolt pattern<\/td>\n<\/tr>\n
Output Shaft Diameter<\/td>\n108 mm section<\/td>\nPer dimensional drawing<\/td>\n<\/tr>\n
Lower Shaft Extension<\/td>\n72 mm \/ M12 thread<\/td>\nOutput end connection<\/td>\n<\/tr>\n
Weight (N.W.)<\/td>\n19 kg<\/td>\nApproximately 41.9 lbs<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

\"superiortransmissioninc-products-EP-12.91<\/p>\n

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Five Key Product Advantages<\/h2>\n
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\u2460 High Reduction Ratio in a Compact Envelope<\/p>\n

A 1:2.91 ratio extracted from a 32\/11 tooth bevel gear pair delivers meaningful torque multiplication \u2014 nearly tripling output torque relative to input \u2014 within a housing that weighs only 19 kg. This combination makes it viable for mounting on compact tractors where implement weight budgets are tight but the driven tool still requires substantial turning force, such as on post-hole diggers or slow-speed material conveyors common in North American and UK farmsteads.<\/comment-tag id=”2″ text=”A 1:2.91 ratio extracted from a 32\/11 tooth bevel gear pair delivers meaningful torque multiplication \u2014 nearly tripling output torque relative to input \u2014 within this compact aluminum gearbox that weighs only 19 kg. This combination makes the aluminum gearbox viable for mounting on compact tractors where implement weight budgets are tight but the driven tool still requires the substantial turning force provided by a speed reduction aluminum gearbox, such as on post-hole diggers or slow-speed material conveyors common in North American and UK farmsteads.” type=”suggestion”><\/p>\n<\/div>\n

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\u2461 Cast Aluminum Housing \u2014 Rust-Free in the Field<\/p>\n

The die-cast aluminum gearbox housing<\/strong> resists corrosion in the wet, chemically active environments found across Brazilian sugarcane plantations, Dutch greenhouse districts, and Australian coastal farms. Unlike cast iron units that require annual rust-prevention treatment, the aluminum body needs only basic cleaning after seasonal use \u2014 a practical advantage when operators manage multiple implements across a short harvest window.<\/p>\n<\/div>\n

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\u2462 Standard 1 3\/8″ Z26 Spline Interface<\/p>\n

The 1 3\/8″ Z26 spline shaft profile used on both input and output is the globally adopted standard for agricultural PTO-driven equipment. This ensures compatibility with virtually every brand of PTO drive shaft on the market, making this unit a practical drop-in choice for aluminum gearbox replacement on existing implements without shaft adaptors or custom machining. The Z26 spline also distributes torque across more contact teeth than the older Z6 format, improving durability at the coupling interface under shock loading.<\/p>\n<\/div>\n

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\u2463 Module 3 Gear Set for Reliable Torque Transfer<\/p>\n

The Module 3.0 bevel gear pair offers a balance of tooth strength and pitch diameter that suits the 13 HP rated power band well. Larger module gears carry more load per tooth but increase overall size; Module 3 hits the practical sweet spot for this power class \u2014 delivering robust engagement without the bulk or weight penalties that would push the unit beyond compact implement mounting constraints in South Korean orchard machines or Colombian hillside farm equipment.<\/p>\n<\/div>\n

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\u2464 ISO 9001:2015 Quality Assurance at Every Stage<\/p>\n

Every EP-1:2.91 unit is manufactured under a documented ISO 9001:2015 quality management system. Dimensional inspection, gear mesh contact pattern checking, and shaft seal leak tests are performed before packing. This framework provides buyers in regulated markets \u2014 EU importers subject to CE Machinery Directive audits, Canadian dealers complying with CSA machinery standards, and Australian distributors operating under AS 4024 safety requirements \u2014 with a traceable quality baseline that supports their own compliance documentation without additional testing overhead on arrival.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

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How This Aluminum Gearbox Works<\/h2>\n

Power enters the EP-1:2.91 through the input spline shaft, connected directly to the tractor PTO via a 1 3\/8″ Z26 spline coupling. The rotating drive gear \u2014 carrying 11 teeth \u2014 meshes with the 32-tooth driven bevel gear at a defined cone angle, transferring torque at a 90-degree change in shaft direction while simultaneously reducing shaft speed by a factor of 2.91. At a standard tractor PTO input of 540 RPM, the output shaft delivers approximately 186 RPM \u2014 a low-speed output well suited to soil engagement tools, auger drives, and slow-turning material processors that would stall or suffer bearing damage if driven at full PTO speed.<\/comment-tag id=”3″ text=”Power enters the aluminum gearbox through the input spline shaft, connected directly to the tractor PTO via a 1 3\/8′ Z26 spline coupling. The rotating drive gear \u2014 carrying 11 teeth \u2014 meshes with the 32-tooth driven bevel gear at a defined cone angle, transferring torque at a 90-degree change in shaft direction within the aluminum right angle gearbox while simultaneously reducing shaft speed by a factor of 2.91. At a standard tractor PTO input of 540 RPM, the output shaft of this aluminum gearbox delivers approximately 186 RPM \u2014 a low-speed output that makes this speed reduction aluminum gearbox well suited to soil engagement tools, auger drives, and slow-turning material processors that would stall or suffer bearing damage if driven at full PTO speed.” type=”suggestion”><\/p>\n

The bevel gear pair runs inside a sealed aluminum housing pre-filled with ISO VG 220 gear oil. Lubrication is splash-based: as the gears rotate, oil is carried from the sump into the mesh zone and across both bearing races on each revolution. Tapered roller bearings at all four shaft positions handle the combined axial and radial loads generated by bevel gear meshing forces, and dual-lip rubber shaft seals at the input and output openings keep oil in and field debris out across the unit’s full operating life. The aluminum alloy body conducts heat away from the gear mesh efficiently, which helps maintain oil viscosity during sustained working sessions in warm climates \u2014 an important factor on summer harvesting runs in Brazil, Colombia, and Australia where ambient temperatures regularly push above 35\u00b0C.<\/p>\n

The elongated output shaft extension (72 mm, M12 thread termination) gives this model a practical assembly advantage: it can be bolted directly into implement drives that require a longer reach to the working element, without a separate extension tube or adapter. This integrated shaft design is one reason the EP-1:2.91 is a recurring choice among OEM implement builders in the Netherlands, South Korea, and Canada who prioritise assembly simplicity in their production lines.<\/p>\n<\/div>\n

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Materials & Component Quality<\/h2>\n
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Housing \u2014 Precision Die-Cast Aluminum<\/p>\n

The outer shell is cast from a high-strength aluminum alloy selected for its combination of low density, good machinability, and corrosion resistance. Mating surfaces are precision-machined to Ra 1.6 \u00b5m or better to achieve an oil-tight fit without relying on sealant compounds that degrade over time in field conditions. The housing weighs approximately one-third of an equivalent cast iron shell, which measurably reduces implement nose-weight on tractor three-point hitches \u2014 a genuine benefit for operators in South Korea and Australia who run compact 18\u201328 HP tractors with tight rear axle load limits.<\/p>\n<\/div>\n

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Bevel Gears \u2014 Carburized Alloy Steel<\/p>\n

Both the 11-tooth and 32-tooth bevel gears are produced from 20CrMnTi alloy steel, hobbed to Module 3.0 geometry, then carburized and case-hardened to 58\u201362 HRC on the tooth flanks. The hard surface resists pitting and micro-pitting fatigue under continuous torque, while the softer core absorbs shock loads from engage-disengage cycles without brittle fracture. Gear flank geometry is checked against ISO 1328 Grade 7 tolerance requirements during inspection, ensuring consistent mesh contact and predictable noise levels across the production batch.<\/p>\n<\/div>\n

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Shafts \u2014 Ground Carbon Steel<\/p>\n

Input and output shafts are turned and ground from 45# carbon steel. The Z26 spline profile on both shaft ends is machined to DIN 5480 tolerance class e8\/H7, ensuring a predictable interference-free fit with any matching PTO drive shaft or implement coupler. Ground bearing seats hold h6 tolerance for precise bearing press-fit and correct preload. This machining consistency is what makes the unit a reliable drop-in aluminum gearbox replacement<\/strong> without field adjustment on arrival at the customer site.<\/p>\n<\/div>\n

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Bearings & Seals<\/p>\n

Tapered roller bearings are selected and pre-adjusted at assembly to achieve a defined axial preload, eliminating running clearance that causes gear noise and accelerated wear. Shaft seals are dual-lip NBR compound rated from \u201340\u00b0C to +120\u00b0C \u2014 a range that covers winter storage in Canadian provinces and full-load summer operation in tropical zones without seal hardening or lip extrusion. A breather plug on the housing prevents pressure buildup during thermal cycling, protecting seals from being pushed out during steep temperature swings between morning startup and afternoon peak operating temperature.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

\"superiortransmissioninc-products-EP-12.91<\/p>\n

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Application Scenarios of Aluminum Gearbox<\/h2>\n

The 1:2.91 reduction ratio and 540 RPM rated input make this aluminum gearbox<\/strong> well suited to implements where the working element runs significantly slower than the tractor PTO. The following scenarios represent the primary applications reported by operators and OEM builders across the global markets this product serves \u2014 from Canadian grain farms to South Korean vegetable production and Colombian hillside coffee estates.<\/p>\n

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\ud83d\udd73\ufe0f Post-Hole Diggers<\/p>\n

Ground auger drives for post-hole diggers are one of the most demanding applications for any small aluminium gearbox<\/strong>. The 1:2.91 reduction delivers the slow, high-torque output needed to penetrate hard soils and rocky substrates commonly found in Australian pastoral properties and Canadian prairie fence-line work, while the aluminum housing keeps the attachment weight low enough for single-person operation on a compact tractor.<\/comment-tag id=”4″ text=”Ground auger drives for post-hole diggers are one of the most demanding applications for any small aluminum gearbox<\/strong>. The 1:2.91 reduction of this speed reduction aluminum gearbox delivers the slow, high-torque output needed to penetrate hard soils and rocky substrates commonly found in Australian pastoral properties and Canadian prairie fence-line work. Additionally, the lightweight aluminum gearbox housing keeps the attachment weight low enough for single-person operation on a compact tractor, making it an ideal aluminum gearbox replacement.” type=”suggestion”><\/p>\n<\/div>\n

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\ud83c\udf3d Forage Chopper Drives<\/p>\n

Stationary and tractor-mounted forage choppers in the Netherlands and Germany use reduction gearboxes to step PTO speed down to the cutting drum speed specified in the implement design. This model’s output shaft design \u2014 with its M12 threaded end and extended 72 mm projection \u2014 allows direct coupling to chopper drum flanges without intermediate adapter hubs, shortening the drive assembly and improving alignment precision.<\/p>\n<\/div>\n

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\ud83c\udf3f Mulcher & Flail Head Drives<\/p>\n

Roadside mulchers and orchard floor mulching heads in the UK, France, and Colombia typically run their rotor at 180\u2013220 RPM. The EP-1:2.91 delivers approximately 186 RPM output from a 540 RPM PTO input \u2014 a near-perfect match for these applications without additional speed adjustment. The aluminum right angle gearbox<\/strong> configuration also simplifies the driveline by combining shaft direction change with speed reduction in a single unit, eliminating one driveline component versus a straight inline reducer paired with a separate bevel box.<\/p>\n<\/div>\n

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\ud83c\udf3e Grain & Seed Auger Drives<\/p>\n

Short-run grain transfer augers on Canadian and US farm storage systems often operate from a tractor PTO at reduced auger tube speeds to control grain damage during transfer. This aluminum gearbox<\/strong> provides the necessary reduction within a sealed, oil-lubricated unit that tolerates the dusty, chaff-laden atmosphere of a grain facility without compromising bearing life \u2014 unlike belt-and-sheave drive alternatives that require frequent tension adjustment and shield cleaning.<\/p>\n<\/div>\n

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\ud83e\udd6c Vegetable Transplanter Drives<\/p>\n

Mechanical transplanters used in South Korean and Japanese vegetable production require slow, precise planting cup rotation \u2014 typically 150\u2013200 RPM. The 186 RPM output of this unit at standard PTO speed aligns well with transplanter design speeds, and the lightweight aluminum gearbox housing<\/strong> reduces three-point hitch nose weight on the small 4WD tractors used in raised-bed vegetable production where ground clearance and row clearance are both constrained.<\/p>\n<\/div>\n

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\ud83d\udd29 Light Industrial Mixer Drives<\/p>\n

Paddle mixers and blending drums in small-scale food processing, compost preparation, and construction aggregate blending facilities use PTO-driven reduction gearboxes as a simple, maintenance-accessible alternative to electric motor drives in off-grid or mobile settings. This unit’s power transmission components are sealed for life with minimal servicing needs, which suits mobile mixing trailers operated across multiple sites in Colombia’s agricultural processing sector.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

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International Standards & Regulatory Compliance<\/h2>\n

Agricultural and industrial power transmission components<\/strong> entering international markets are subject to a variety of mechanical safety, noise, and equipment certification frameworks. The EP-1:2.91 is designed to be compatible with the primary regulatory standards active in the regions where this product is most widely deployed.<\/p>\n

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EU \u2014 Machinery Directive 2006\/42\/EC & ISO 500<\/p>\n

Equipment sold across EU member states must comply with the Machinery Directive covering mechanical risk, PTO guarding, and noise declaration. The Z26 spline shaft interface on this unit conforms to ISO 500 PTO connection geometry, which is mandated for all tractor-implement combinations operated on EU farms. Importers in the Netherlands, Germany, and France are required to confirm CE compliance documentation before placing agricultural gearbox products on their market.<\/p>\n<\/div>\n

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USA & Canada \u2014 ASABE S203 \/ OSHA \/ CSA<\/p>\n

ASABE Standard S203.12 defines PTO shaft geometry for North American agricultural equipment; this unit’s 1 3\/8″ Z26 spline meets those dimensional requirements. OSHA 1910.219 covers mechanical power transmission guarding for industrial installations in the US, applying where this gearbox is used in processing facilities rather than on-farm tractor operations. Canadian CSA B11 series standards for machinery safety apply in industrial settings across all provinces.<\/p>\n<\/div>\n

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Australia & New Zealand \u2014 AS 4024 Series<\/p>\n

The AS 4024 safety of machinery series governs rotating equipment used in Australian and New Zealand workplaces. AS 4024.3302 specifically addresses PTO-driven machinery design. Reduction gearboxes imported into Australia for agricultural use are also subject to state-level Work Health and Safety (WHS) legislation that requires adequate guarding over all rotating shafts, and maintenance instructions to be available in English for operators.<\/p>\n<\/div>\n

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South Korea \u2014 KS B ISO 500<\/p>\n

Korean Standard KS B ISO 500 aligns PTO shaft geometry with the international ISO 500 framework. Agricultural machinery for use across Korean rice paddies, fruit orchards, and vegetable production systems must comply with the Agricultural Mechanisation Promotion Act, which establishes minimum mechanical safety requirements for commercially operated implements. Our Z26 spline conforms to the dimensional provisions of KS B ISO 500 without modification.<\/p>\n<\/div>\n

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Brazil \u2014 ABNT NBR 9690<\/p>\n

ABNT NBR 9690 governs agricultural tractor PTO dimensions in Brazil and is harmonized with ISO 500, confirming direct dimensional compatibility with this unit’s Z26 spline. Equipment operating on Brazilian sugarcane and coffee estates must also comply with NR-31 (Agricultural Safety), which specifies mechanical guarding requirements for PTO-driven equipment to protect workers in field operations involving ground-engaging tools driven at high torques.<\/p>\n<\/div>\n

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United Kingdom \u2014 PUWER 1998 \/ PSSR<\/p>\n

The UK Provision and Use of Work Equipment Regulations (PUWER 1998) and the Supply of Machinery (Safety) Regulations 2008 \u2014 now retained in UK law post-Brexit \u2014 both require that agricultural gearboxes and drive components carry a declaration of conformity and meet guarding requirements for all rotating shafts accessible to operators. Field operations in England, Scotland, and Wales are also subject to HSE guidance on safe use of PTO-driven equipment under PUWER inspection regimes.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

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Manufacturing Background & Capability<\/h2>\n

Our facility carries more than a decade of continuous hands-on experience in mechanical power transmission design and manufacture. Over that time, we have refined our production processes through direct feedback from operators, OEM equipment builders, and agricultural distributors in more than thirty countries \u2014 which shapes both our product specifications and our quality inspection criteria in ways that catalogue-driven design simply does not achieve.<\/p>\n

Our manufacturing scope spans agricultural gearboxes, worm gear reducers, planetary gear drives, power take-off shafts, hydraulic cylinders, precision gears, roller chains, and electric motors. We design and produce gearbox housings and assemblies in ductile iron, cast iron, cast steel, precision cast steel, and cast aluminum. Supporting components \u2014 sprockets, worm gears, pulleys, worms, and both standard and custom-profile shafts \u2014 are also made in-house, which gives customers ordering complete driveline assemblies a genuine one-source supply option with consistent dimensional control across all mating parts.<\/p>\n

Our quality management system holds ISO 9001:2015 certification, covering the complete production cycle from incoming material inspection through machining, assembly, gear contact pattern verification, leak testing, and final dimensional audit before each unit is packed for dispatch. This certification provides the traceability documentation that regulated markets \u2014 particularly EU, Australian, and Canadian distributors \u2014 need for their own import and compliance records.<\/p>\n<\/div>\n

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WorkShop<\/h3>\n
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\"Rolling
\n\"Gearbox
\n\"Assembly
\n\"Welding<\/div>\n<\/div>\n<\/div>\n

<\/p>\n

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Compatible Products & One-Stop Supply<\/h2>\n

The EP-1:2.91 aluminum gearbox<\/strong> is designed to work as part of a broader driveline system. We supply the complete range of matched drive components from the same facility, so you can specify, order, and verify system compatibility in a single conversation rather than coordinating across multiple suppliers.<\/p>\n

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\"PTO<\/p>\n

PTO Drive Shaft<\/p>\n

A matched \u067e\u06cc \u0679\u06cc \u0627\u0648 \u0634\u0627\u0641\u0679<\/a> connects this aluminum gearbox to your tractor output without guesswork. Our shaft range uses the same 1 3\/8″ Z26 spline standard as this gearbox, spanning both telescoping and fixed-length models with integrated overrunning clutches and CE-compliant plastic guards. Sourcing the shaft alongside the gearbox from the same production facility eliminates dimensional mismatch risk and ensures the full driveline runs within design concentricity from day one \u2014 an advantage that becomes apparent on post-hole digger applications where misalignment under torque causes premature bearing wear.<\/p>\n<\/div>\n

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\"Full<\/p>\n

Agricultural Gearbox Series<\/p>\n

The EP-1:2.91 sits within a comprehensive \u0632\u0631\u0639\u06cc \u06af\u06cc\u0626\u0631 \u0628\u0627\u06a9\u0633<\/a> range that spans ratios from 1:1 to 6:1 and power ratings from 10 HP to 150 HP, available in aluminum, cast iron, and ductile iron housings. Whether a given implement requires a higher ratio, more horsepower capacity, or a different housing material to suit a corrosive or high-temperature environment, the full range covers it \u2014 providing a single-source procurement path from compact garden tractor implements all the way up to commercial-scale harvester driveline components.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

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Frequently Asked Questions<\/h2>\n
\nQ1. What kind of tractor PTO output is needed to run this aluminum gearbox on a post-hole digger in Australia?<\/summary>\n

This unit accepts a standard 540 RPM PTO input through a 1 3\/8″ Z26 spline shaft \u2014 the predominant connection type on Australian tractors from 18 HP compact models right up through mid-range 60 HP four-wheel-drive units used on dryland farms and pastoral properties. The 1:2.91 reduction delivers approximately 186 RPM at the output shaft, which suits most commercially available post-hole digger auger designs rated for the compact tractor segment. No speed adjustment is needed at the tractor side provided your PTO runs at the standard 540 RPM setting, which is the lower PTO range available on essentially all modern tractors sold in Australia.<\/comment-tag id=”5″ text=”This aluminum gearbox accepts a standard 540 RPM PTO input through a 1 3\/8″ Z26 spline shaft \u2014 the predominant connection type on Australian tractors from 18 HP compact models right up through mid-range 60 HP four-wheel-drive units used on dryland farms. The 1:2.91 ratio of this speed reduction aluminum gearbox delivers approximately 186 RPM at the output shaft, which suits most commercially available post-hole digger auger designs. No speed adjustment is needed at the tractor side when using this aluminum right angle gearbox, provided your PTO runs at the standard 540 RPM setting, proving why this aluminum gearbox is a top choice for operators in Australia.” type=”suggestion”><\/p>\n<\/details>\n

\nQ2. How do I find the right aluminum gearbox replacement for a forage chopper that originally had a 1:2.9 ratio unit in the Netherlands?<\/summary>\n

For an aluminum gearbox replacement in a Dutch forage chopper application, the three parameters to match are ratio, shaft interface, and mounting footprint. The EP-1:2.91 provides a ratio of 1:2.91 \u2014 close enough to the original 1:2.9 that chopper drum speed will be within 0.3% of the original design value, which is imperceptible in practice. The 1 3\/8″ Z26 spline is the standard interface used by virtually all European forage equipment, and our bolt circle (4 \u00d7 \u03a611 holes on a 108 mm pitch circle diameter) matches the flanged mounting used on most European-manufactured chopper frames from the 1990s onward. Provide your original unit’s mounting drawing and we can confirm dimensional compatibility before order placement.<\/p>\n<\/details>\n

\nQ3. Which aluminum right angle gearbox ratio works best for driving a vegetable transplanter at the correct planting speed in South Korea?<\/summary>\n

For South Korean vegetable transplanter applications, the 1:2.91 ratio in this model delivers an output of around 186 RPM from the 540 RPM low-PTO setting used on the small four-wheel-drive tractors common in Korean raised-bed production. Most mechanical transplanting heads for cabbage, lettuce, and root vegetables are designed to run the planting cup carousel between 150 and 210 RPM \u2014 placing this gearbox’s output squarely within the operational range without requiring ground speed adjustments that would compromise row spacing accuracy. If your transplanter specifies a slower planting speed, our agricultural gearbox series includes models at 1:4 and 1:6 ratios that cover the same PTO interface.<\/p>\n<\/details>\n

\nQ4. When should I schedule oil changes and seal inspections on an aluminum gearbox used for sugarcane mulching operations in Brazil?<\/summary>\n

For Brazilian sugarcane mulching operations running continuous 8\u201310 hour daily cycles in high-ambient-temperature conditions, the recommended first oil change is at 100\u2013150 operating hours to remove break-in wear debris from the gear mesh. Subsequent intervals can extend to 300\u2013400 hours once the initial metal particles have been flushed. Knowing how to clean aluminum gearbox housings externally is also important in cane trash environments: plant fibre can pack around shaft seals and trap moisture against the housing. A monthly external inspection to clear debris from seal areas, combined with checking for oil weeping at both shaft exits, will identify seal wear before it progresses to contamination. Full lip seal replacement every 800\u20131000 hours is a reasonable preventive maintenance interval for year-round tropical field operation.<\/p>\n<\/details>\n

\nQ5. What are the CE compliance requirements for agricultural aluminum gearbox units being imported and sold across European Union member states?<\/summary>\n

Agricultural gearboxes placed on the EU market as part of or alongside PTO-driven machinery must conform to the Machinery Directive 2006\/42\/EC, which requires a technical file, risk assessment, and Declaration of Conformity signed by the manufacturer or EU-authorised representative. The PTO shaft coupling interface must comply with ISO 500 \u2014 which our Z26 spline does \u2014 and the unit must be supplied with guarding provision or guarding fitted at all rotating shaft exposure points accessible to operators. Importers and distributors in Germany, the Netherlands, France, and other EU member states are responsible for verifying these documents are in place before equipment is sold to end users. We can provide technical documentation to support your CE compliance process on request.<\/p>\n<\/details>\n

\nQ6. How does an aluminum gearbox housing hold up compared to cast iron in the wet and humid conditions of a Canadian grain handling facility?<\/summary>\n

In the humid, condensation-prone environment inside a Canadian grain elevator or on-farm bin system \u2014 especially during the moisture swings between autumn harvest and winter storage \u2014 an aluminum gearbox housing<\/strong> offers a meaningful longevity advantage over cast iron. Aluminum does not rust, so surface oxidation remains a superficial white bloom rather than the structural pitting that degrades cast iron housings over multiple winter cycles. The aluminum body is also lighter, which matters on conveyor systems where multiple drive units are stacked along a bin row and combined weight affects the structural design of the installation framework. Externally, the housing requires only an annual wipe-down with a dry cloth and a visual seal inspection \u2014 neither of which demands specialized tools or facilities during a busy post-harvest maintenance window.<\/p>\n<\/details>\n<\/div>\n<\/div>\n

Editor: PXY<\/p>","protected":false},"excerpt":{"rendered":"

The EP-1:2.91 Ratio Aluminum Gearbox (Item HCAM281-874) is a specialized transmission unit designed for agricultural machinery requiring extended reach and speed multiplication. Featuring a precise 1:2.91 gear ratio with a 32\/11 tooth configuration and a 3.0 module, this gearbox operates efficiently at a rated input of 540 rpm and handles up to 13 HP. It is equipped with a standard 1 3\/8 Z6 spline interface for secure power transfer. Weighing 19 kg, the unit combines a durable aluminum housing with an extended output shaft design, making it ideal for specific rotary cultivation setups where compact torque conversion and extended drive length are essential for optimal field performance.<\/p>","protected":false},"featured_media":420,"template":"","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":""},"product_brand":[],"product_cat":[25],"product_tag":[],"class_list":["post-419","product","type-product","status-publish","has-post-thumbnail","product_cat-aluminum-gearbox","first","instock","shipping-taxable","product-type-simple"],"_links":{"self":[{"href":"https:\/\/superiortransmissioninc.com\/ur\/wp-json\/wp\/v2\/product\/419","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/superiortransmissioninc.com\/ur\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/superiortransmissioninc.com\/ur\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/superiortransmissioninc.com\/ur\/wp-json\/wp\/v2\/media\/420"}],"wp:attachment":[{"href":"https:\/\/superiortransmissioninc.com\/ur\/wp-json\/wp\/v2\/media?parent=419"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/superiortransmissioninc.com\/ur\/wp-json\/wp\/v2\/product_brand?post=419"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/superiortransmissioninc.com\/ur\/wp-json\/wp\/v2\/product_cat?post=419"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/superiortransmissioninc.com\/ur\/wp-json\/wp\/v2\/product_tag?post=419"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}