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Agricultural gearbox

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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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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 →