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Heavy Planetary Carrier and Transmission Components — Large Format Precision Machined to Drawing

Heavy Planetary Carrier and Large Format Transmission Components — Precision Machined to Customer Drawing

SMI manufactures heavy planetary carriers and large format transmission components to customer drawing and technical specification — covering planet carriers, ring gears, output flanges and gear shaft assemblies at weights and dimensions beyond the envelope of standard industrial reducer supply. The planet carrier shown below — Φ680 × 620mm, 810KG — is representative of the scale and precision machining capability SMI applies to heavy transmission component supply.

Every component in this category is produced to the customer’s own engineering drawing. Material grade, dimensional tolerances, heat treatment specification, surface finish and inspection requirements are all defined by the customer’s design — SMI’s role is to manufacture to that specification with the casting, forging and precision machining capability required to achieve it consistently.

SMI heavy planet carrier precision machined cast steel Phi 680 x 620mm 810KG to customer drawing specification for energy drilling mining and heavy industrial transmission systems
SMI heavy planet carrier — Φ680 × 620mm, 810KG, precision machined cast steel to customer drawing and specification

Representative Component — Planet Carrier Φ680 × 620mm, 810KG

The planet carrier is the most structurally demanding component in a planetary transmission system. It carries the full output torque of the reducer, supports the planet gear bearing loads on all pin positions simultaneously, and must maintain precise dimensional relationships between pin bores across its full service life under cyclic loading.

At Φ680 × 620mm and 810KG, the component shown represents a transmission system capable of handling several thousand kilowatts of input power — consistent with the drive system requirements of energy drilling equipment, large ball mills, tunnel boring machine cutter head drives and heavy marine lifting machinery. Key manufacturing requirements for a component at this scale include:

  • Casting integrity — at 810KG, internal soundness of the casting is critical. Any porosity or inclusion concentration at the hub or pin boss locations will initiate fatigue cracking under the cyclic torque loads of heavy drive service. SMI’s casting practice for heavy components includes controlled pouring, riser design and post-casting inspection to verify internal quality before machining begins
  • Pin bore positional accuracy — the angular and radial position of each planet pin bore determines the load sharing between planet gears. Positional error concentrates load on individual planets and reduces the effective torque capacity of the assembly. SMI machines pin bores to the positional tolerances specified in the customer’s drawing, verified by CMM inspection
  • Hub bore concentricity — the central hub bore carries the output shaft or sun gear shaft bearing. Concentricity relative to the pin bore pitch circle is machined and verified to drawing tolerance
  • Flange face flatness and bolt circle accuracy — the output flange face and bolt circle are machined to the assembly tolerances required for correct mating with the adjacent shaft or housing component

Heavy Transmission Component Range

Planet Carriers

Cast steel planet carriers from small industrial sizes up to 810KG and above — machined to customer drawing for single-stage and multi-stage planetary systems. Hub bore, pin bore positions, flange face and bolt circle all machined to drawing tolerance. CMM dimensional verification as standard on large format components.

Internal Ring Gears

Large format internal ring gears — cast or forged blanks, internal gear cut to specified module, tooth profile accuracy grade and face width. Heat treatment to specified surface hardness. Ring gear housing bore and mounting features machined to assembly drawing. Available in through-hardened and case-hardened configurations to customer specification.

Output Flanges and Carrier Flanges

Heavy output flanges and carrier flanges — precision machined bolt circle, mating face flatness and bore dimensions to assembly drawing tolerances. Flange face machining to the surface finish specified for the sealing or mating interface requirements of the customer’s application.

Planet Gear Shaft Assemblies

Planet gear shaft assemblies — external gear cutting to specified module and accuracy grade, shaft journal machining to bearing fit dimensions, spline features to customer profile specification. Heat treatment and surface finish to drawing. Available as individual components or as matched sets for a complete planet gear stage.

Sun Gears and Input Shaft Assemblies

Sun gear and input shaft assemblies — external gear cutting, journal machining and spline or coupling features to customer drawing. Case hardening or nitriding to specified surface hardness and case depth. Balanced to customer requirement for high-speed input shaft applications.

Application Sectors

Energy and Drilling Equipment

Heavy planetary transmission components for the drive systems of energy drilling and production equipment — including drawworks transmission systems, mud pump drives and rotary table drives for oil and gas drilling applications. These applications demand high torque density, resistance to shock loading and consistent dimensional accuracy across the full component set to ensure reliable operation under the demanding conditions of drilling service.

Mining and Mineral Processing

Large format planet carriers, ring gears and output flanges for ball mill drives, SAG mill drives, crusher drives and mine hoist transmission systems. Mill drive planetary systems operate continuously under high torque and are subject to the cyclic shock loads generated by the grinding charge — requiring casting integrity and dimensional accuracy that SMI’s heavy component manufacturing capability is designed to deliver.

Tunnelling and Construction Machinery

Heavy planetary transmission components for cutter head drive systems and large crawler crane travel drives. Cutter head planetary systems operate under extreme and variable load conditions — requiring robust casting design, controlled heat treatment and precise pin bore geometry to maintain load sharing across all planet positions throughout the service life of the drive.

Marine and Offshore Lifting

Planet carriers and ring gears for ship deck machinery, heavy lift crane slewing and hoisting drives, and offshore winch transmission systems. Marine applications require material certification to classification society standards — available on request from SMI.

Manufacturing Capability

Operation Capability
Casting Cast steel planet carriers and housings — weight from small industrial to 810KG and above
Forging Forged blanks for ring gears, sun gears and shaft components where mechanical property requirements exceed cast steel capability
Turning and boring Large format CNC turning and boring — hub bores, flange faces and journal diameters to drawing tolerance
Gear cutting Internal and external gear cutting — module, tooth profile and accuracy grade to customer specification
Pin bore machining Positional accuracy to customer drawing — CMM verification on large format planet carriers
Heat treatment Through hardening, case hardening and nitriding to specified surface hardness and case depth
Inspection CMM dimensional inspection, hardness verification, material certification — standard on heavy components

بالعربية — ناقلات الكواكب الثقيلة ومكونات نقل الحركة كبيرة الحجم

تقوم SMI بتصنيع ناقلات الكواكب الثقيلة ومكونات نقل الحركة كبيرة الحجم وفقاً لرسومات العملاء والمواصفات التقنية — تشمل ناقلات الكواكب، التروس الحلقية الداخلية، الشفاه الإخراجية، ومجموعات أعمدة التروس الكوكبية بأوزان وأبعاد تتجاوز النطاق المعياري. ناقل الكواكب الممثل: Φ680 × 620مم، 810 كجم. قطاعات التطبيق: معدات الحفر، مطاحن التعدين، آلات حفر الأنفاق، والرافعات البحرية الثقيلة. للاستفسار، تواصل مع فريق SMI →

En Español — Portasatélites Pesados y Componentes de Transmisión de Gran Formato

SMI fabrica portasatélites pesados y componentes de transmisión de gran formato según los planos y especificaciones técnicas del cliente — incluyendo portasatélites, coronas internas, bridas de salida y conjuntos de ejes de engranajes planetarios con pesos y dimensiones que superan el rango estándar. Portasatélite representativo: Φ680 × 620mm, 810KG. Sectores de aplicación: equipos de perforación energética, molinos de minería, maquinaria de tunelización y sistemas de elevación marina pesada. Para consultas, contacte al equipo de SMI →

Auf Deutsch — Schwere Planetenträger und Großformat-Getriebekomponenten

SMI fertigt schwere Planetenträger und Großformat-Getriebekomponenten nach Kundenzeichnung und technischer Spezifikation — einschließlich Planetenträger, Hohlräder, Ausgangsflansche und Planetenradwellenbaugruppen mit Gewichten und Abmessungen jenseits des Standardbereichs. Repräsentativer Planetenträger: Φ680 × 620mm, 810KG. Anwendungsbereiche: Energiebohrausrüstung, Bergbaumulühlen, Tunnelbohrmaschinen und schwere Marinehubsysteme. Für Anfragen, kontaktieren Sie das SMI-Team →

Related Products — SMI Transmission & Drive Systems

Request a Consultation

To discuss heavy planetary carrier or large format transmission component requirements, please provide the following at enquiry stage:

  • Component type — planet carrier, ring gear, output flange, gear shaft or complete stage
  • Key dimensions — outer diameter, height, hub bore diameter, approximate weight
  • Material specification — steel grade, heat treatment and mechanical property requirements
  • Gear data — module, number of teeth, accuracy grade (for ring gears and gear shafts)
  • Pin bore data — number of planets, pin bore diameter, positional tolerance (for planet carriers)
  • Application — equipment type and operating conditions
  • Inspection and certification requirements — CMM report, material cert, classification society if applicable
  • Drawing or 3D model if available

SMI will respond with a written technical assessment and commercial proposal. Contact SMI — Heavy Transmission Component Enquiry →

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Daily Design Works- Agriculture gearboxes

Agriculture Gearbox Design and Manufacturing — Rotary Lawn Mower Series

SMI’s engineering team designs and manufactures agricultural gearboxes from initial concept through to finished product — covering 3D CAD design, casting, precision machining and assembly. The rotary lawn mower gearbox series shown on this page represents one area of SMI’s mechanical design and manufacturing capability, with configurations supplied to agricultural equipment manufacturers in Canada and other markets.

All gearbox configurations are developed to customer specification. SMI does not supply standard catalogue products — every configuration is engineered to the specific input/output requirements, mounting geometry and performance specification of the customer’s equipment.

3D CAD section view of SMI-designed rotary mower gearbox — multi-stage gear train, bearing layout and housing geometry developed in-house before manufacture
Aluminium alloy gearbox housings in production — in-house casting gives SMI direct control over dimensional accuracy and surface finish quality

Design and Manufacturing Capability

In-House CAD Engineering

SMI’s engineering team develops full 3D CAD models of gearbox assemblies before manufacture — covering gear geometry, shaft layout, bearing selection, housing design and assembly clearances. The sectioned CAD model shown above illustrates the multi-stage gear train and internal layout typical of SMI’s rotary mower gearbox designs. In-house design capability means SMI can work from a customer’s functional specification or performance requirement, not just from a finished drawing.

Casting and Housing Manufacture

Gearbox housings are manufactured in-house from aluminium alloy castings — as shown in the production image above. Casting in-house gives SMI direct control over dimensional accuracy, wall thickness consistency and surface finish quality, which are critical to gear alignment and bearing life in the finished assembly.

Precision Machining and Assembly

Machined bores, bearing seats, shaft features and mounting faces are produced to the tolerances required for correct gear mesh and bearing fit. Final assembly and functional verification are carried out before despatch.

30-40 series rotary mower gearbox – orizontal shaft configuration, custom colour and mounting to customer specification
30-40 series horizontal shaft configuration in red — shaft layout and mounting pattern customisable to OEM specification
30-40 series vertical shaft configuration in black finish — output shaft orientation and surface treatment customisable to OEM requirement
30-40 series right-angle drive configuration — splined output shaft and flange mounting for rotary mower deck installations
30-40 series compact upright configuration — optimised for space-constrained mower deck installations
50-60 series heavy-duty gearbox — circular flange mount and right-angle drive for higher power rotary mower applications
70-80 series high-power gearbox — vertical output shaft with large flange base for heavy-duty rotary mowing applications

Rotary Lawn Mower Gearbox Series

The series shown covers a range of input power classes — from the 30–40 hp range through to the 70–80 hp range — in multiple mounting and shaft configurations. Standard configurations include horizontal shaft, vertical shaft and right-angle drive layouts to suit different mower deck and PTO connection geometries.

Series Power Range Typical Application
30-40 Series 30–40 hp Mid-range rotary mowers — multiple shaft configurations
50-60 Series 50–60 hp Heavy-duty rotary mowers — right-angle drive configuration
70-80 Series 70–80 hp High-power rotary mowers — vertical output shaft configuration

Custom configurations outside this range — different power ratings, gear ratios, shaft dimensions, mounting patterns or housing materials — are available on request. SMI will develop a configuration to the customer’s specific equipment requirements.

Custom and OEM Supply

SMI’s gearbox manufacturing capability is available to agricultural equipment manufacturers requiring:

  • Design from specification — SMI engineers develop the gearbox configuration from the customer’s functional and performance requirements
  • Design from drawing — SMI manufactures to the customer’s existing engineering drawing or CAD model
  • Design improvement — SMI reviews an existing configuration and proposes engineering changes to improve performance, service life or manufacturability
  • OEM supply — finished gearboxes supplied under customer branding and packaging
  • Custom configurations — power rating, gear ratio, shaft layout, housing material, surface finish and colour to customer specification

Request a Consultation

To discuss agricultural gearbox design and supply for your equipment, please provide the following at enquiry stage:

  • Input power — hp or kW
  • Required gear ratio and output shaft speed
  • Shaft configuration — input and output orientation
  • Mounting geometry — bolt pattern, flange or foot mounting
  • Annual volume requirement
  • Existing drawing or specification if available

SMI will respond with a written technical assessment. Contact SMI — Agriculture Gearbox Enquiry →

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Power take-off (PTO) Shaft

PTO Shaft and Power Take-Off Components — OEM Agricultural Driveline Manufacturing

A power take-off (PTO) shaft transmits engine power from a tractor or vehicle to an attached implement or driven machine. It is one of the most fundamental mechanical interfaces in agricultural equipment — standardised in dimensions and operating speed to allow interchangeability across tractor and implement brands worldwide.

SMI manufactures PTO shafts, yokes, safety shields and associated driveline components to customer drawing and specification. Production covers casting, machining, surface treatment and export packaging — with finished assemblies supplied to agricultural equipment manufacturers and distributors in Europe and other global markets, including supply to customers in Germany.

PTO safety shield — black plastic construction manufactured to ISO 500 safety requirements, custom colour and geometry available
PTO yoke with quick-release locking pin — spline bore dimensions and surface finish to customer specification
PTO yoke in natural finish — cast steel construction, spline bore and lock pin detail, custom configurations available

Technical Background — PTO Standards and Configurations

Agricultural PTO shafts are standardised under ISO 500, which defines shaft dimensions, spline profiles, operating speeds and safety requirements. Three principal configurations are in common use:

Type Speed Splines Shaft Diameter Application
Standard 540 RPM 6 1⅜ inch General agricultural implements
High speed — small 1000 RPM 21 1⅜ inch Higher power applications
High speed — large 1000 RPM 20 1¾ inch High torque applications

SMI can manufacture to any of these standard configurations or to customer-specified non-standard profiles. Spline dimensions, shaft length, yoke type and safety shield configuration are all customisable to the specific implement or equipment requirement.

Components Supplied

PTO Shafts — Complete Assemblies

Complete PTO shaft assemblies comprising inner and outer telescoping tubes, universal joints, yokes and safety shields. Shaft length, tube diameter, joint angle capacity and safety shield type are specified to the customer’s implement design. Standard yellow finish or alternative surface treatments available.

Yokes and Quick-Release Connectors

Cast and forged yoke components in standard and custom configurations — including push-pin, bolt-on and quick-release locking types. Spline bore dimensions manufactured to ISO 500 or customer specification. Available in standard silver/natural finish or painted to customer colour requirement.

Safety Shields

Plastic safety shields for PTO shaft assemblies — manufactured to ISO 500 safety requirements. Standard black configuration or custom colour. Shield geometry designed to the specific shaft assembly dimensions.

Spare Parts and Sub-Components

Individual universal joints, cross kits, bearing cups and yoke components available as spare parts supply alongside complete shaft assemblies. All parts manufactured to the same drawing and specification as the original assembly.

PTO shaft assemblies with safety shields — batch production showing consistent finish quality across the production run
PTO shaft spray painting line — batch yellow finish applied to complete shaft assemblies before final inspection and packaging
PTO shaft assemblies drying after paint application — consistent yellow finish across batch production for OEM customers
PTO shaft export packaging — wooden frame pallet with plastic wrapping, labelled and ready for ocean freight despatch
Complete export consignment of PTO shaft assemblies — wooden cases, plastic wrapping and export labels, ocean freight ready for international customers

Manufacturing and Export Capability

The gallery images above show SMI’s PTO shaft production and export preparation process — from painted shaft assemblies on the production line through to completed export packaging. Key manufacturing stages include:

  • Casting and forging — yoke and component manufacture to dimensional drawing
  • Machining — spline cutting, bore machining and surface finishing to specified tolerances
  • Surface treatment — powder coating and paint finishing, standard yellow or customer-specified colour
  • Assembly — complete shaft assembly with universal joints, safety shields and end fittings
  • Export packaging — wooden frame pallet with plastic wrapping, labelled for export, ocean freight ready

Finished assemblies are manufactured in China and exported globally. SMI’s production capability supports both small development orders and large-volume OEM supply programmes.

OEM and Custom Supply

SMI’s PTO shaft manufacturing capability is available to agricultural equipment manufacturers and distributors requiring:

  • OEM supply to drawing — shaft assemblies manufactured to the customer’s engineering drawing or CAD model
  • Custom configuration — shaft length, spline profile, yoke type, joint angle, surface finish and shield colour to specification
  • Branded packaging — customer branding on shaft assemblies and packaging
  • Spare parts programmes — ongoing supply of replacement components alongside new shaft assemblies
  • Development support — SMI can assist customers in specifying the correct shaft configuration for new implement designs

Typical Applications

  • Rotary mowers and flail mowers
  • Balers and forage harvesters
  • Spreaders and sprayers
  • Tillers and cultivators
  • Pumps and generators driven from tractor PTO
  • Industrial and truck-mounted applications — water pumps, blowers, winches, compactors

En Español — Ejes de Toma de Fuerza (PTO) para Maquinaria Agrícola

SMI fabrica ejes de toma de fuerza (PTO), yugos y componentes de transmisión según los planos y especificaciones del cliente. La producción cubre fundición, mecanizado, tratamiento de superficie y embalaje de exportación. Configuraciones compatibles con ISO 500 en los tres tipos estándar (540 RPM y 1000 RPM), así como perfiles de estrías personalizados. Suministro OEM disponible para fabricantes de equipos agrícolas. Para consultas, contacte al equipo de SMI →

En Français — Arbres de Prise de Force (PTO) pour Matériel Agricole

SMI fabrique des arbres de prise de force (PTO), des fourches et des composants de transmission selon les plans et spécifications du client. La production comprend la fonderie, l’usinage, le traitement de surface et l’emballage pour l’exportation. Configurations compatibles ISO 500 dans les trois types standard (540 tr/min et 1000 tr/min), ainsi que des profils de cannelures personnalisés. Fourniture OEM disponible pour les fabricants de matériel agricole. Pour toute demande, contactez l’équipe SMI →

Po Polsku — Wały Odbioru Mocy (WOM) do Maszyn Rolniczych

SMI produkuje wały odbioru mocy (WOM/PTO), widełki i komponenty napędowe według rysunków i specyfikacji klienta. Produkcja obejmuje odlewanie, obróbkę mechaniczną, obróbkę powierzchniową i pakowanie eksportowe. Konfiguracje zgodne z normą ISO 500 we wszystkich trzech typach standardowych (540 obr/min i 1000 obr/min), a także niestandardowe profile wielowypustów. Dostawa OEM dostępna dla producentów sprzętu rolniczego. W sprawie zapytań prosimy o kontakt z zespołem SMI →

Türkçe — Tarım Makineleri için PTO Şaftları ve Güç Aktarma Bileşenleri

SMI, müşteri çizim ve teknik özelliklerine göre PTO şaftları, yoke bileşenleri ve tahrik milleri üretmektedir. Üretim; döküm, işleme, yüzey işlemi ve ihracat ambalajını kapsamaktadır. ISO 500 uyumlu üç standart konfigürasyon (540 devir/dak ve 1000 devir/dak) ile özel kanal profillerinde üretim yapılmaktadır. Tarım ekipmanı üreticileri için OEM tedarik mevcuttur. Sorularınız için SMI ekibiyle iletişime geçin →

Related Products — SMI Agricultural Mechanical Components

Request a Quotation

To enquire about PTO shaft or driveline component supply, please provide the following:

  • Component type — complete shaft assembly, yoke, shield or spare parts
  • PTO standard — ISO 500 type (540 RPM / 1000 RPM) or customer-specified
  • Shaft length and tube diameter
  • Spline profile and yoke type
  • Surface finish and colour requirement
  • Annual volume — units per year
  • Drawing or specification if available

SMI will respond with a written technical assessment and commercial proposal. Contact SMI — PTO Shaft Enquiry →

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Planetary Reducer

Planetary Reducer and Precision Gear Components — Custom Manufacturing to Customer Specification

SMI manufactures planetary reducers and precision gear components to customer drawing and technical specification — covering gear cutting, precision machining, heat treatment and assembly. Planetary reducer configurations cover a wide ratio range with multiple output shaft options, supplied to industrial equipment manufacturers and OEM customers in heavy machinery, mining, energy and marine sectors.

As with all SMI mechanical component supply, finished products are produced to the customer’s own engineering drawing or specification. SMI does not supply standard catalogue reducers — every configuration is engineered to the specific ratio, torque, shaft geometry and mounting requirements of the customer’s application.

SMI planetary reducer precision components- output flange, ring gear, planet carrier assembly and planet gear shaft, machined to customer specification
SMI planetary reducer component set – output flange, internal ring gear, planet carrier and planet gear shaft assembly, all precision machined to customer drawing and specification

Planetary Reducer — Configuration and Capability

A planetary gear system consists of a central sun gear, a set of planet gears rotating around it, a ring gear enclosing the assembly, and a planet carrier transmitting the output torque. The compact, coaxial layout of the planetary system delivers high torque density relative to its physical size — making it the preferred reducer configuration for space-constrained and high-torque applications across heavy industry.

Standard Configuration Range

Parameter Range Notes
Gear ratio 3:1 — 400:1 Single and multi-stage configurations
Output torque Up to 2,000 N.m Higher torque on request
Output shaft type Square, hexagonal, flange Custom shaft geometry available
Custom configurations All parameters To customer drawing and specification

Custom configurations outside the standard range — higher torque ratings, alternative shaft dimensions, modified mounting geometry or specific material grades — are available on request. SMI application engineers will confirm the appropriate configuration at the enquiry stage.

Components Manufactured

The image above shows four core planetary reducer components manufactured by SMI — illustrating the precision machining capability applied across the full component set:

  • Output flange / planet carrier flange — precision bolt circle and mating face, machined to assembly drawing tolerances
  • Ring gear — internal gear cutting to specified module, tooth profile and accuracy grade
  • Planet carrier assembly — bearing bore machining, planet pin holes and structural body
  • Planet gear shaft assembly — external gear cutting, shaft journals and spline features to drawing

Herringbone Gear Capability

In addition to planetary reducer components, SMI manufactures herringbone gears — a double helical gear configuration where two sets of oppositely angled helical teeth are combined side by side. The herringbone geometry cancels the axial thrust loads inherent in single helical gears, allowing high power transmission without the substantial thrust bearing requirements that helical gears impose. This characteristic makes herringbone gears particularly well suited to high-torque gearboxes in heavy machinery and marine propulsion applications.

Herringbone gears are more demanding to manufacture than equivalent spur or helical gears — requiring precise alignment of the opposing helical flanks at the centreline junction. SMI’s gear cutting capability covers this geometry, with finished gears supplied to the accuracy grade and material specification required by the customer’s application.

Applications

  • Mining and mineral processing equipment — conveyors, mills, hoists and crushing machinery
  • Heavy industrial machinery — presses, mixers, extruders and material handling equipment
  • Energy sector — wind turbine pitch and yaw drives, oil and gas pumping systems
  • Marine propulsion and auxiliary machinery — where herringbone gear capability is directly relevant
  • Construction equipment — tracked vehicles, cranes and lifting machinery
  • Agricultural and forestry machinery — high-torque drive systems

OEM and Custom Supply

SMI’s planetary reducer and gear component manufacturing service is available to equipment manufacturers requiring:

  • Component supply to drawing — individual gear components produced to the customer’s engineering drawing or CAD model
  • Complete reducer assembly — fully assembled and tested planetary reducer to customer specification
  • Gear cutting to specification — module, tooth profile, accuracy grade and material to customer requirement
  • Heat treatment — case hardening, through hardening or nitriding to specified surface hardness and case depth
  • Spare parts supply — replacement gear components alongside new equipment orders

بالعربية — مخفضات الكوكبية ومكونات التروس الدقيقة

تقوم SMI بتصنيع مخفضات السرعة الكوكبية ومكونات التروس الدقيقة وفقاً لرسومات العملاء والمواصفات التقنية. تغطي نسب التخفيض من 3:1 إلى 400:1، مع عزم دوران للإخراج يصل إلى 2000 نيوتن متر. تتوفر تكوينات مخصصة لتطبيقات الآلات الثقيلة والتعدين والطاقة. للاستفسار، تواصل مع فريق SMI →

En Español — Reductores Planetarios y Componentes de Engranajes de Precisión

SMI fabrica reductores planetarios y componentes de engranajes de precisión según los planos y especificaciones técnicas del cliente. Las relaciones de reducción cubren de 3:1 a 400:1, con par de salida de hasta 2.000 N.m. Se encuentran disponibles configuraciones personalizadas para aplicaciones en maquinaria pesada, minería y sector energético. Para consultas, contacte al equipo de SMI →

Auf Deutsch — Planetengetriebe und Präzisionszahnradkomponenten

SMI fertigt Planetengetriebe und Präzisionszahnradkomponenten nach Kundenzeichnung und technischer Spezifikation. Die Übersetzungsverhältnisse reichen von 3:1 bis 400:1, mit einem Ausgangsdrehmoment von bis zu 2.000 N.m. Kundenspezifische Konfigurationen für Schwermaschinenbau, Bergbau und Energiesektor sind verfügbar. Für Anfragen, kontaktieren Sie das SMI-Team →

Related Products — SMI Transmission & Drive Systems

Request a Consultation

To discuss planetary reducer or gear component requirements, please provide the following at enquiry stage:

  • Required gear ratio and number of stages
  • Input speed — RPM
  • Output torque requirement — N.m
  • Output shaft configuration — square, hex, flange or custom
  • Mounting geometry and envelope dimensions
  • Material and heat treatment specification if known
  • Annual volume — units per year
  • Drawing or specification if available

SMI will respond with a written technical assessment and commercial proposal. Contact SMI — Planetary Reducer Enquiry →

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Agricultural gearboxes

Agricultural Gearbox — Rotary Mower, Tiller and Farm Equipment Series, 30HP to 300HP

SMI has been manufacturing agricultural gearboxes since 1996 — covering rotary mower series, rotary tiller series, rice harvester series and grain transportation and storage series across a power range from 30HP to 300HP. Finished gearboxes and OEM components are supplied to agricultural equipment manufacturers and distributors in North America, Australia, Europe and Asia-Pacific.

All gearbox configurations are produced to customer drawing or specification. Standard series configurations are available, and custom ratios, shaft dimensions, mounting geometry and power ratings are offered to meet the specific requirements of each customer’s equipment design.

Product Series

Rotary Mower Gearbox Series

SMI’s rotary mower gearbox series covers the full power range from 30HP to 300HP in multiple shaft configurations — horizontal dual shaft, right-angle drive, vertical output shaft and splitter configurations. Standard input shaft is 1¾” — 20 spline (ISO 500 1000 RPM PTO) with alternative input configurations available to customer specification. Gear ratios are customisable across the series. Applications include rotary cutters, rotary slashers, rotary mowers and power dividers for tractor-mounted and self-propelled equipment.

Splitter Gearbox Series

Standard agricultural splitter gearbox series with power capacity up to 120HP. Input shaft: 1¾” — 20 spline. Gear ratio customisable to customer requirement. Used in multi-blade rotary mower configurations where a single PTO input drives multiple output shafts to separate cutting deck sections.

Rotary Tiller Gearbox Series

Gearboxes for rotary tiller and cultivator applications — designed for the high-torque, high-shock-load conditions of soil engagement. Configurations include right-angle and inline drive layouts to suit different tiller designs and tractor PTO connection geometries.

Rice Harvester Gearbox Series

Specialised gearbox configurations for rice harvester and combine harvester applications — covering threshing drum drives, cutter bar drives and grain handling transmission components. Produced to customer drawing for integration into harvester assembly lines.

Grain Transportation and Storage Series

Gearbox and drive components for grain augers, conveyors and handling equipment — covering the drive system requirements of grain storage and transportation machinery in both on-farm and commercial grain handling applications.

Manufacturing Capability

The gallery above shows SMI’s agricultural gearbox production process — from individual components through batch machining, shaft manufacture and assembly to finished gearbox units ready for despatch. Key manufacturing stages include:

  • Housing casting — gearbox housings cast in-house from grey iron and ductile iron to dimensional drawing
  • Gear cutting — spur, helical and bevel gear cutting to specified module, tooth profile and accuracy grade
  • Shaft machining — input and output shafts machined to spline profile, journal dimensions and surface finish specification
  • Heat treatment — gear and shaft components heat treated to specified surface hardness and case depth
  • Assembly — bearing fitting, gear mesh setting, seal installation and functional verification before despatch

Finished Products and Export Packaging

Finished agricultural gearboxes are inspected, labelled and packed for export in wooden cases or cartons to ocean freight standard. SMI’s export packaging has supported deliveries to agricultural equipment manufacturers and distributors in Canada, Australia, India, Poland and other markets across North America, Asia-Pacific and Europe.

Factory Facilities

The images above show SMI’s manufacturing facilities — machining workshop, assembly area and heat treatment furnace. The heat treatment capability shown is directly relevant to the gear and shaft components that determine the service life and load capacity of the finished gearbox.

Specifications

Parameter Standard Range Custom
Power range 30HP — 300HP Available on request
Splitter series max power Up to 120HP Higher ratings on request
Standard input shaft 1¾” — 20 spline (ISO 500) Alternative profiles available
Gear ratio Customisable across all series To customer specification
Output shaft configuration Horizontal, vertical, right-angle, splitter Custom geometry available
Housing material Grey iron, ductile iron Alternative materials on request
OEM branding Available Packaging and labelling to customer spec

Applications

  • Rotary cutters, rotary slashers and rotary mowers
  • Power dividers for multi-blade mower decks
  • Rotary tillers and cultivators
  • Rice harvesters and combine harvesters
  • Grain augers and conveying equipment
  • Manure spreaders and belt saw drives
  • Cotton choppers and tree cutters
  • Lift pumps and agricultural water handling equipment

En Español — Cajas de Engranajes Agrícolas para Maquinaria de Campo

SMI fabrica cajas de engranajes agrícolas desde 1996 — cubriendo series de cortadoras rotativas, series de fresadoras rotativas, series de cosechadoras de arroz y series de transporte y almacenamiento de granos, en un rango de potencia de 30HP a 300HP. Suministro OEM según planos y especificaciones del cliente. Exportado a América del Norte, Australia, Europa y Asia-Pacífico. Para consultas, contacte al equipo de SMI →

En Français — Boîtes de Vitesses Agricoles pour Matériel de Terrain

SMI fabrique des boîtes de vitesses agricoles depuis 1996 — couvrant les séries de faucheuses rotatives, les séries de motoculteurs rotatifs, les séries de moissonneuses de riz et les séries de transport et de stockage de céréales, dans une plage de puissance de 30CV à 300CV. Fourniture OEM selon les plans et spécifications du client. Exporté vers l’Amérique du Nord, l’Australie, l’Europe et l’Asie-Pacifique. Pour toute demande, contactez l’équipe SMI →

Po Polsku — Przekładnie Rolnicze do Maszyn Polowych

SMI produkuje przekładnie rolnicze od 1996 roku — obejmujące serie kosiarek rotacyjnych, serie glebogryzarek, serie kombajnów do ryżu oraz serie transportu i magazynowania zboża, w zakresie mocy od 30KM do 300KM. Dostawa OEM według rysunków i specyfikacji klienta. Eksportowane do Ameryki Północnej, Australii, Europy i Azji i Pacyfiku. W sprawie zapytań, skontaktuj się z zespołem SMI →

Türkçe — Tarım Makineleri için Tarım Dişli Kutuları

SMI, 1996’dan bu yana tarım dişli kutuları üretmektedir — döner biçerdöver serileri, döner çapa makinesi serileri, pirinç hasat makinesi serileri ve tahıl taşıma ve depolama serilerini 30HP ile 300HP güç aralığında kapsamaktadır. Müşteri çizim ve teknik özelliklerine göre OEM tedarik mevcuttur. Kuzey Amerika, Avustralya, Avrupa ve Asya-Pasifik’e ihraç edilmektedir. Sorularınız için SMI ekibiyle iletişime geçin →

Related Products — SMI Transmission & Drive Systems

Request a Consultation

To discuss agricultural gearbox supply for your equipment, please provide the following at enquiry stage:

  • Gearbox series — rotary mower, splitter, tiller, harvester or other
  • Required power rating — HP or kW
  • Input shaft specification — spline profile and PTO speed
  • Required gear ratio and output shaft configuration
  • Mounting geometry — bolt pattern and envelope dimensions
  • Annual volume — units per year
  • OEM requirements — branding, packaging, labelling
  • Drawing or specification if available

SMI will respond with a written technical assessment and commercial proposal. Contact SMI — Agricultural Gearbox Enquiry →