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The Agricultural 226 Series 75 HP Gearbox is a right-angle bevel gearbox designed for the drive train of tractor-mounted rotary mowers and finishing mowers. It takes the PTO input from the tractor at 540 rpm and drives the mower blade carrier through a bevel gear pair, changing the drive direction by 90 degrees and stepping the speed up (1:1.5) or down (1:1.83) depending on the blade tip speed the mower manufacturer requires. Rated input power is 75 HP / 56 kW, which matches the middle of the rotary mower range used on pasture, verge and orchard mowers across Europe, North America and Australia.
The gearbox is supplied with a cast iron or cast aluminium housing, hardened and ground bevel gears, and a double-lip oil seal on both input and output shafts. The gear pair is lapped as a matched set before assembly, so the mesh is quiet and the backlash is held tight across the production batch. Oil is not shipped with the gearbox — first oil change is recommended at 50-70 operating hours, then every 500-700 operating hours or at least once a year. Raydafon produces the 226 Series Gearbox as an ISO 9001 certified factory with a full range of matching PTO shafts and slip clutches for a complete mower drive package.
A 226 Series 75 HP Rotary Mower Gearbox is a right-angle bevel gearbox that transfers power from the tractor PTO to the rotary mower blade carrier. The tractor PTO runs horizontally at 540 rpm; the mower blade carrier runs horizontally too, but offset to the side of the PTO line, so the drive has to make a 90° turn and adjust the speed at the same time. The 226 Series does this with a matched pair of hardened and ground bevel gears — input pinion and output crown wheel — enclosed in a rigid cast housing that bolts directly to the mower deck.
The 226 Series designation refers to the gearbox family and the 75 HP power class. Two ratios are available: 1:1.5 and 1:1.83. A higher ratio (1:1.83) increases blade tip speed, which is required for a cleaner cut on pasture grass; a lower ratio (1:1.5) keeps the tip speed down, which is used on finishing mowers and mowers running on rougher ground. The correct ratio is selected against the mower width, the blade diameter and the tractor PTO speed, and is confirmed at the quotation stage.
The table below lists the full specification of the Agricultural 226 Series 75 HP Gearbox. Input shaft, output shaft, mounting flange and PTO input speed are confirmed against the mower deck and the tractor PTO at the time of order.
| Gearbox Series | 226 Series agricultural gearbox |
| Gearbox Type | Right-angle bevel gearbox |
| Rated Input Power | 75 HP / 56 kW |
| Available Ratios | 1:1.5 and 1:1.83 |
| Weight | 36 kg |
| Gear Type | Hardened and ground bevel gears, lapped as a matched set |
| Housing Material | Cast iron or cast aluminium, machined in one setup |
| Sealing | Double-lip oil seal on input and output shafts with dust wiper |
| Lubrication | Oil bath; oil is not shipped with the gearbox |
| First Oil Change | After 50-70 operating hours |
| Subsequent Oil Change | Every 500-700 operating hours or at least once a year |
| Primary Application | Rotary mower, finishing mower, verge mower, orchard mower |
| Matching Components | PTO shaft with slip clutch, quick-release yoke available from same factory |
| Certification | ISO 9001 |
The 226 Series Gearbox is built around six design features that together decide whether the gearbox survives a mowing season without rebuild. The list below explains what each one contributes on a working rotary mower.
The bevel gear pair is designed to an optimized ratio and lapped as a matched set, so power transmission is smooth and blade speed stays consistent across the full width of cut. This is what keeps the cut quality even at the edges of the mower.
Advanced damping and tooth-form optimization reduce the meshing noise of the bevel pair. On a mower running near the tractor or near livestock, a quieter gearbox is one that has correct backlash and stable tooth contact, not a design afterthought.
Gears are produced from high-quality alloy steel and case-hardened to resist tooth pitting and scoring under the shock loads a mower sees when it hits stones or thick stalks. The gear teeth are ground after heat treatment to hold the tooth profile.
The housing and exposed surfaces receive a multi-layer anti-corrosion treatment that resists fertiliser splash, mud, and long outdoor storage between seasons. This is what separates a mower gearbox that lasts five seasons from one that starts to pit in the second.
The housing is a modular cast design that simplifies the internal structure. Disassembly for inspection or seal replacement is straightforward, so a mower that needs a mid-season repair can be back in the field the same day rather than waiting for a factory rebuild.
The gearbox runs an oil bath with internal splash lubrication to the bevel pair and the bearings. There are no external grease points, so maintenance is limited to the periodic oil change at 50-70 hours and then every 500-700 hours or annually.
The Agricultural 226 Series 75 HP Gearbox is used across the mid-power rotary mower range. The application categories below are the ones most often quoted on a Raydafon enquiry.
A rotary mower drive is only as good as the PTO shaft and slip clutch that feed it. Raydafon produces the matching PTO shaft and slip clutch for the 226 Series Gearbox from the same factory, so the gearbox, shaft and clutch are supplied as one drive package with a confirmed torque rating. This removes the need for the mower builder to source the gearbox and the shaft from two different suppliers and then figure out whether the slip clutch setting is correct for the gearbox rating.
To confirm the correct Agricultural 226 Series 75 HP Gearbox and issue a quotation, Raydafon needs the five items below. For a straight replacement of an existing 226 Series Gearbox, the original part number or a dimensioned drawing is usually enough.
Send the five items below and Raydafon will confirm the ratio, shaft configuration, mounting flange and lead time within one working day.
The Agricultural 226 Series 75 HP Gearbox is a right-angle bevel gearbox used for the drive train of tractor-mounted rotary mowers, finishing mowers, verge mowers and orchard mowers. It takes the tractor PTO input and turns it 90 degrees to drive the mower blade carrier at the ratio required for the correct blade tip speed.
The 226 Series Gearbox is rated for 75 HP / 56 kW input power and is available in two ratios: 1:1.5 and 1:1.83. Weight is 36 kg. The correct ratio is selected against the mower width, the blade diameter and the tractor PTO speed, and is confirmed at the time of order.
All 226 Series Gearboxes are supplied without oil. First oil change is recommended after 50-70 operating hours. Subsequent oil changes are recommended every 500-700 operating hours or at least once a year, whichever comes first. The specific oil grade is confirmed in the installation and maintenance manual that ships with the unit.
Yes. Send the original gearbox part number, nameplate photo or a dimensioned drawing and Raydafon will confirm whether the ratio, shaft configuration and mounting flange match. Where the original is obsolete, a functionally equivalent 226 Series Gearbox can be produced against the same mower deck dimensions.
The gearbox itself does not include a slip clutch, but Raydafon supplies a matching PTO shaft with a slip clutch as a drive package from the same factory. The slip clutch setting is confirmed against the gearbox rating so the mower is protected against shock loads from hitting stones.
The 226 Series Gearbox housing is available in cast iron or cast aluminium depending on the mower application. Cast iron is specified where the housing is a structural part of the mower deck; cast aluminium is specified where weight is the deciding factor. Both variants are machined in one setup to keep the bearing bores coaxial.
Raydafon produces the full range of agricultural gearboxes, including rotary tiller gearboxes, flail mower gearboxes, rotary cutter gearboxes, post hole digger gearboxes, square baler gearboxes, round baler gearboxes, snowblower gearboxes and the full agricultural gearbox range. Matching agricultural PTO shafts, slip clutches and hydraulic cylinders for tipping trailers are also available from the same factory.
Standard configurations ship in 15 to 30 days. Custom ratios, shaft configurations and mounting flanges are confirmed with the quotation. As an OEM manufacturer, Raydafon can supply from single-unit replacement up to full mower production quantities. MOQ depends on the specific configuration and is confirmed when the specification is fixed.
Whether you are replacing a worn gearbox on an existing rotary mower, engineering a new mower deck around a specific ratio, or sourcing 226 Series Gearboxes and matching PTO shafts in volume for a mower OEM program, Raydafon can quote the Agricultural 226 Series 75 HP Gearbox to your ratio, shaft configuration and mounting flange requirements. OEM and project quantities supplied directly from the Ningbo factory.
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Luotuo Industrial Area, Zhenhai District, Ningbo City, China
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