Beskrivelse
HC-9.311 Rotary Agricultural Gearbox — Compact 30HP Drive Solution for UK Rotary Cutters
The HC-9.311 Rotary agricultural gearbox is engineered for demanding rotary cutter and mower applications across British farms, estates, and groundskeeping operations. Rated at 30HP with a 1:2.9 gear ratio, this rotary agricultural gearbox delivers consistent, reliable power transfer where compact dimensions and precise torque distribution matter most. Whether you run a compact tractor on mixed grassland or a dedicated flail mower on arable headlands, the HC-9.311 gives you the mechanical confidence to keep working through long shifts without compromise.
Typically responds within 1 business day • UK & global enquiries welcome
Why the HC-9.311 Rotary Agricultural Gearbox Stands Out
Farmers and contractors across England, Scotland, and Wales who run rotary cutters, slashers, and mowing decks need a rotary agricultural gearbox that doesn’t become the weak link in the chain. The HC-9.311 is built around a 32/11 tooth pairing with a module of 3.0, producing a 1:2.9 overdrive ratio that spins the cutting head at the speed your blades demand while keeping tractor PTO loads firmly within the rated 540 rpm band. At 13.5 kg net weight, the unit is light enough to fit smaller sub-frame designs without creating imbalance issues — a real advantage when you’re retrofitting or replacing units on compact or mid-spec machines. The cast housing is machined to tight tolerances so heat dissipation is predictable, and the sealing arrangement prevents ingress from grass juice, soil particles, and mud — conditions that prematurely kill cheaper units.
Operating Principle, Materials & Field Applications
At the core of the HC-9.311 is a single-stage helical bevel gear set — 32 teeth on the crown wheel, 11 on the pinion — running inside a pressure die-cast grey iron housing. This tooth configuration produces a 1:2.9 speed-increase ratio from the tractor PTO to the implement output shaft. Gear blanks are forged from medium-carbon alloy steel (typically 20CrMnTi or equivalent), case-hardened and precision-ground to ISO accuracy grades, which explains the low running noise and smooth power delivery you notice immediately on first engagement. Taper roller bearings carry both axial and radial loads at the input shaft junction, while needle roller bearings support the lighter-loaded output side — this split bearing strategy keeps weight down without compromising service life under intermittent shock loads from striking stones or dense vegetation. The housing is finished with an agricultural-grade epoxy enamel that resists UV exposure and the caustic effect of fertiliser drift, making it appropriate for year-round outdoor use in any UK county.
Grass paddocks, verges, and rough ground on farms across England, Scotland & Wales
Roadside contractors and local councils maintaining highway verges and green space
Country estates and equestrian centres requiring quiet, dependable mowing drives
UK machinery manufacturers seeking a reliable, cost-stable rotary agricultural gearbox supply
The input configuration — 1 3/8 inch, 6-spline (Z6) — is the standard British tractor PTO fitting, so there is no need for adapter sleeves on virtually any UK tractor manufactured in the past 35 years. The optic axis output (plain round shaft with keyway) suits the wide range of blade hub flanges found on popular British rotary implement brands. Assembly uses metric fasteners and standard agricultural-grade seals, so servicing with tools already on most UK farms is entirely practical.
Technical Specifications — HC-9.311 Rotary
| PRODUCT PARAMETERS | |
|---|---|
| PUNKT | HC30 |
| Forhold | 1:2.9 |
| Tænder | 32/11 |
| Modul | 3.0 |
| Power (HP) | 30 |
| Nominel indgang | 540 rpm |
| Beskrivelse af input/output | 1 3/8 Z6 / Optic axis |
| Weight (N.W.) | 13.5 Kg |
Related HC Series Rotary Agricultural Gearboxes
The HC-9.311 sits within a broader family of rotary agricultural gearboxes designed to cover a wide range of tractor power bands and implement configurations. If your application calls for a different power rating, ratio, or shaft arrangement, these closely related models are worth evaluating alongside the HC-9.311:
Customer Success: Yorkshire Grassland Contractor, UK
Dales Contracting Ltd operates a fleet of six compact tractors providing grass cutting services to farms, local authorities, and National Park land management bodies across North Yorkshire and the Yorkshire Dales. In spring 2024 they replaced four worn-out rotary agricultural gearboxes across two implements with HC-9.311 units, primarily because the 1:2.9 ratio matched their existing blade-speed settings without requiring any deck adjustments.
After a full cutting season covering an estimated 1,200 hectares of mixed grassland, moorland edge, and riparian margins, all four units remained in service with no leaks, no bearing noise, and no requirement for anything beyond scheduled oil checks. The operations manager noted that the lightweight build made mid-field gearbox swaps between operators much more manageable than the heavier units they had used previously. Total downtime attributable to gearbox issues across the season: zero hours.
“We’ve tried several brands over the years and the HC-9.311 is honestly the most consistent unit we’ve run. It runs quietly, it stays oil-tight, and at 13.5 kg it’s easy to handle in the field. Ordered three more for next season.”
“Fitted the HC-9.311 to our rotary cutter as a direct replacement — bolt-on fitment, no modifications. The 1:2.9 ratio gave us the blade tip speed we needed for thistle and dock control on our Scottish upland grazing blocks. Very pleased.”
“As a machinery dealer we carry the HC30 as a go-to replacement gearbox for rotary machines. The price point is competitive, lead times are short, and the units simply don’t come back with warranty claims. Our customers keep asking for them by name.”
Manufacturing Capability & Custom Engineering
The HC-9.311 Rotary agricultural gearbox is produced in a dedicated agricultural drivetrain facility equipped with CNC gear hobbing machines, coordinate measuring equipment, and a dedicated heat-treatment line. Every gear set passes through a noise and vibration test rig before housing assembly, which is why running quality remains consistent from the first unit in a batch to the last. For UK importers and OEM machinery manufacturers, a formal factory audit can be arranged on request — something very few gearbox suppliers of this price tier offer openly.
Custom engineering capability is a genuine strength of this supply relationship, not a marketing footnote. If your implement design calls for a modified flange pattern, a different shaft diameter, an alternative seal specification for high-moisture environments, or a specific colour finish to match your machine livery, the engineering team can accommodate changes from minimum order quantities that make sense for UK implement builders and specialist contractors. Bespoke gear ratios outside the standard catalogue range can also be discussed for volume commitments, making this an unusually flexible source for rotary agricultural gearbox procurement in the British market.
Supplying UK Agricultural Machinery Buyers
For buyers based in England, Scotland, Wales, and Northern Ireland, the HC-9.311 Rotary agricultural gearbox ships in protective foam-lined packaging suitable for pallet or parcel freight, with all relevant documentation provided for customs clearance and resale. UK machinery dealers holding stock of this rotary agricultural gearbox benefit from straightforward product liability documentation, consistent part numbers, and technical support accessible by email. Whether you are sourcing a single replacement unit for a customer’s machine or placing a trade order for seasonal stock, enquiries are handled directly by the technical sales team — not through a third-party distributor layer.
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