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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 →