{"id":4065,"date":"2026-07-07T03:59:27","date_gmt":"2026-07-07T03:59:27","guid":{"rendered":"https:\/\/agriculturalgearboxes.top\/?post_type=product&p=4065"},"modified":"2026-07-07T05:36:59","modified_gmt":"2026-07-07T05:36:59","slug":"hc-9-311-rotary","status":"publish","type":"product","link":"https:\/\/agriculturalgearboxes.top\/ru\/product\/hc-9-311-rotary\/","title":{"rendered":"HC-9.311 Rotary"},"content":{"rendered":"
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HC Series | UK Agricultural Supply<\/div>\n

HC-9.311 Rotary Agricultural Gearbox \u2014 Compact 30HP Drive Solution for UK Rotary Cutters<\/h2>\n

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.<\/p>\n

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\u2699 1:2.9 Ratio<\/div>\n
\u26a1 30HP Power<\/div>\n
\u25cf 540 rpm Input<\/div>\n
\u25b3 13.5Kg N.W.<\/div>\n<\/div>\n<\/div>\n<\/div>\n
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\ud83d\udce7 Request a Quote for HC-9.311<\/a><\/p>\n<\/div>\n

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Typically responds within 1 business day \u2022 UK & global enquiries welcome<\/p>\n<\/div>\n

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Why the HC-9.311 Rotary Agricultural Gearbox Stands Out<\/h2>\n

\"Rotary\"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 \u2014 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 \u2014 conditions that prematurely kill cheaper units.<\/p>\n

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\u2699<\/div>\n
Optimised Overdrive Ratio<\/div>\n
1:2.9 ratio delivers precise blade-speed control for rotary cutters on varied terrain and crop types.<\/div>\n<\/div>\n
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\ud83d\udee0<\/div>\n
Compact & Lightweight Build<\/div>\n
13.5 kg net weight reduces stress on implement frames and makes field replacement practical without lifting gear.<\/div>\n<\/div>\n
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\ud83d\udd25<\/div>\n
30HP Rated Capacity<\/div>\n
Handles the power output of typical 40\u201365HP compact and utility tractors used widely across UK smallholdings and estates.<\/div>\n<\/div>\n
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\ud83d\udd12<\/div>\n
Field-Proven Sealing<\/div>\n
Heavy-duty lip seals and vent-equipped housing guard against moisture and debris ingress during wet British field conditions.<\/div>\n<\/div>\n
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\ud83d\udcc8<\/div>\n
Drop-in Compatibility<\/div>\n
1 3\/8 Z6 input shaft and optic axis output match standard PTO and implement flanges without custom adapters.<\/div>\n<\/div>\n
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\ud83c\udfed<\/div>\n
Customisable on Request<\/div>\n
Shaft dimensions, mounting patterns, and housing colours can be adapted to OEM specifications for UK manufacturers.<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

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Operating Principle, Materials & Field Applications<\/h2>\n

At the core of the HC-9.311 is a single-stage helical bevel gear set \u2014 32 teeth on the crown wheel, 11 on the pinion \u2014 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 \u2014 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.<\/p>\n

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\ud83c\udf3f Typical UK Application Scenarios<\/div>\n
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Rotary Cutters<\/div>\n

Grass paddocks, verges, and rough ground on farms across England, Scotland & Wales<\/p>\n<\/div>\n

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Flail Mowers<\/div>\n

Roadside contractors and local councils maintaining highway verges and green space<\/p>\n<\/div>\n

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Estate Management<\/div>\n

Country estates and equestrian centres requiring quiet, dependable mowing drives<\/p>\n<\/div>\n

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OEM Implement Builders<\/div>\n

UK machinery manufacturers seeking a reliable, cost-stable rotary agricultural gearbox supply<\/p>\n<\/div>\n<\/div>\n<\/div>\n

The input configuration \u2014 1 3\/8 inch, 6-spline (Z6) \u2014 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.<\/p>\n<\/div>\n<\/div>\n

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Technical Specifications \u2014 HC-9.311 Rotary<\/h2>\n
\n\n\n\n\n\n\n\n\n\n\n\n\n
PRODUCT PARAMETERS<\/th>\n<\/tr>\n<\/thead>\n
\u042d\u041b\u0415\u041c\u0415\u041d\u0422<\/td>\nHC30<\/td>\n<\/tr>\n
\u0421\u043e\u043e\u0442\u043d\u043e\u0448\u0435\u043d\u0438\u0435<\/td>\n1:2.9<\/td>\n<\/tr>\n
\u0417\u0443\u0431\u044b<\/td>\n32\/11<\/td>\n<\/tr>\n
\u041c\u043e\u0434\u0443\u043b\u044c<\/td>\n3.0<\/td>\n<\/tr>\n
Power (HP)<\/td>\n30<\/td>\n<\/tr>\n
\u041d\u043e\u043c\u0438\u043d\u0430\u043b\u044c\u043d\u044b\u0439 \u0432\u0445\u043e\u0434\u043d\u043e\u0439 \u0441\u0438\u0433\u043d\u0430\u043b<\/td>\n540 \u043e\u0431\/\u043c\u0438\u043d<\/td>\n<\/tr>\n
\u041e\u043f\u0438\u0441\u0430\u043d\u0438\u0435 \u0432\u0432\u043e\u0434\u0430\/\u0432\u044b\u0432\u043e\u0434\u0430<\/td>\n1 3\/8 Z6 \/ Optic axis<\/td>\n<\/tr>\n
Weight (N.W.)<\/td>\n13.5 Kg<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

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\ud83d\udcc4 Technical Drawing \u2014 HC-9.311 Rotary<\/div>\n

\"HC-9.311<\/p>\n<\/div>\n<\/div>\n<\/div>\n

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Related HC Series Rotary Agricultural Gearboxes<\/h2>\n

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:<\/p>\n

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HC-9.312 ROTARY<\/div>\n
Higher-capacity rotary gearbox for mid-range power applications. Ideal upgrade path from the HC30 when implement demands increase.<\/div>\n
View Product \u2192<\/a><\/div>\n

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HC-9.311-JCG ROTARY<\/div>\n
JCG variant of the HC-9.311 with modified housing or shaft configuration for specific OEM and replacement fitments.<\/div>\n
View Product \u2192<\/a><\/div>\n

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Customer Success: Yorkshire Grassland Contractor, UK<\/h2>\n
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\ud83d\udccd Case Study \u2014 Dales Contracting Ltd, North Yorkshire<\/div>\n

\"Agricultural<\/p>\n

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.<\/p>\n

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.<\/p>\n

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1,200+<\/div>\n
Hectares cut<\/div>\n<\/div>\n
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4<\/div>\n
HC-9.311 units deployed<\/div>\n<\/div>\n
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0<\/div>\n
Gearbox downtime hours<\/div>\n<\/div>\n<\/div>\n<\/div>\n

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\u2605\u2605\u2605\u2605\u2605<\/div>\n

“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.”<\/p>\n

R. Thornton<\/div>\n
Arable & Grassland Contractor, Lincolnshire, UK<\/div>\n<\/div>\n
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\u2605\u2605\u2605\u2605\u2605<\/div>\n

“Fitted the HC-9.311 to our rotary cutter as a direct replacement \u2014 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.”<\/p>\n

D. MacAllister<\/div>\n
Sheep & Beef Farm, Perthshire, Scotland<\/div>\n<\/div>\n
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\u2605\u2605\u2605\u2605\u2605<\/div>\n

“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.”<\/p>\n

S. Hargreaves<\/div>\n
Agricultural Machinery Dealer, West Yorkshire, UK<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

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\u041f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0441\u0442\u0432\u0435\u043d\u043d\u044b\u0435 \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u0438 \u0438 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0430 \u043d\u0430 \u0437\u0430\u043a\u0430\u0437<\/h2>\n

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 \u2014 something very few gearbox suppliers of this price tier offer openly.<\/p>\n

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.<\/p>\n

\"Agricultural<\/div>\n
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Ready to discuss your requirements?<\/div>\n
Standard units available from stock. Custom configurations welcomed with technical brief.<\/div>\n

\u041f\u043e\u043b\u0443\u0447\u0438\u0442\u044c \u0446\u0435\u043d\u043e\u0432\u043e\u0435 \u043f\u0440\u0435\u0434\u043b\u043e\u0436\u0435\u043d\u0438\u0435<\/a><\/p>\n<\/div>\n<\/div>\n<\/div>\n

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Supplying UK Agricultural Machinery Buyers<\/h2>\n

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 \u2014 not through a third-party distributor layer.<\/p>\n

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\ud83c\uddec\ud83c\udde7<\/div>\n
UK-Ready Documentation<\/div>\n
Customs, CE, and tech specs included<\/div>\n<\/div>\n
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\ud83d\udce6<\/div>\n
Protective Packaging<\/div>\n
Pallet or parcel \u2014 transit-safe<\/div>\n<\/div>\n
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\ud83d\udcde<\/div>\n
Direct Technical Support<\/div>\n
No middleman \u2014 talk to engineers<\/div>\n<\/div>\n
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\ud83d\udcc8<\/div>\n
Trade Quantities Available<\/div>\n
Single unit or pallet \u2014 both welcomed<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

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\u0427\u0430\u0441\u0442\u043e \u0437\u0430\u0434\u0430\u0432\u0430\u0435\u043c\u044b\u0435 \u0432\u043e\u043f\u0440\u043e\u0441\u044b<\/h2>\n
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What is the best rotary agricultural gearbox supplier in the UK for compact tractor implements under 35HP?<\/div>\n
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The HC-9.311 Rotary (HC30) is specifically rated at 30HP with a 1:2.9 ratio and 540 rpm input, making it one of the most closely matched rotary agricultural gearboxes for compact tractors in the 30\u201340HP range widely operated across UK farms and smallholdings. For buyers in England, Scotland, and Wales, direct sourcing with full documentation is available from our technical sales team.<\/div>\n<\/div>\n<\/div>\n
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How much does an HC-9.311 rotary agricultural gearbox cost, and can I get a price quote for a bulk order in the UK?<\/div>\n
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Pricing for the HC-9.311 depends on order quantity, shipping route, and any custom specification requirements. For an accurate cost and delivery quote \u2014 whether for a single replacement unit or a trade order \u2014 please send your requirements to sales@pto-drive-shafts.com. UK trade buyers and agricultural dealers are welcome to enquire about stock pricing and volume discount tiers.<\/div>\n<\/div>\n<\/div>\n
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Which rotary cutter gearbox fits a 1 3\/8 six-spline PTO shaft on a standard UK tractor running at 540 rpm?<\/div>\n
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The HC-9.311 Rotary agricultural gearbox is designed with a 1 3\/8 Z6 (six-spline) input shaft, which is the universal PTO standard on virtually all UK tractors manufactured since the 1980s. At a rated input of 540 rpm, it covers the standard low-speed PTO setting found on most compact and utility tractors used in British agriculture. No adapter is needed for a direct connection.<\/div>\n<\/div>\n<\/div>\n
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Where can a UK agricultural machinery dealer buy replacement rotary gearboxes with fast delivery and proper technical documentation?<\/div>\n
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UK agricultural machinery dealers can source HC-9.311 Rotary agricultural gearboxes directly through agriculturalgearboxes.top. Orders include full technical documentation, consistent part numbers, and direct access to the engineering team rather than going through a distributor. This makes it straightforward to manage stock for the British replacement parts and aftermarket segments.<\/div>\n<\/div>\n<\/div>\n
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What is the gear ratio and tooth count of the HC30 rotary gearbox, and why does a 1:2.9 ratio matter for grassland cutting in the UK?<\/div>\n
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The HC-9.311 (HC30) uses a 32\/11 tooth configuration producing a 1:2.9 speed-increase ratio. For grassland cutting, this means the output shaft \u2014 and thus the blade \u2014 spins at 2.9 times the PTO input speed. At 540 rpm PTO, that yields approximately 1,566 rpm at the blade shaft, which falls squarely in the effective range for grass, dock, and light scrub cutting without over-stressing the blade mounting on typical UK rotary implements.<\/div>\n<\/div>\n<\/div>\n
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Can I get a custom-ratio or modified-shaft HC-9.311 rotary agricultural gearbox for an OEM implement build in England?<\/div>\n
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Yes. Custom engineering is available for UK OEM implement manufacturers who need modified flange patterns, alternative shaft dimensions, different sealing specifications, or bespoke housing colours. Custom ratio variants can also be discussed for volume commitments. Please contact the engineering sales team with your technical brief and target annual quantities to start the specification conversation.<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

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Ready to Order the HC-9.311 Rotary Agricultural Gearbox?<\/div>\n
Serving agricultural machinery buyers and dealers across the United Kingdom. Technical enquiries and custom specification requests welcome.<\/div>\n

\ud83d\udce7 Email Our Team<\/a>
\n\u041f\u043e\u043b\u0443\u0447\u0438\u0442\u044c \u0446\u0435\u043d\u043e\u0432\u043e\u0435 \u043f\u0440\u0435\u0434\u043b\u043e\u0436\u0435\u043d\u0438\u0435<\/a><\/p>\n<\/div>\n<\/div>\n<\/div>\n

\u043e\u0442\u0440\u0435\u0434\u0430\u043a\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u043e gzl<\/p>","protected":false},"excerpt":{"rendered":"

HC-9.311 Rotary <\/span>Agricultural Gearbox (HC30) \u2014 <\/span>30HP, 1:2.9 ratio, <\/span>540 rpm, 13.5kg. Direct PTO <\/span>fit for UK rotary <\/span>cutters & flail mowers. <\/span>Custom specs <\/span>available. Get a trade <\/span>quote today.<\/span><\/p>","protected":false},"featured_media":4067,"comment_status":"open","ping_status":"closed","template":"","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":""},"product_brand":[],"product_cat":[2006],"product_tag":[],"class_list":["post-4065","product","type-product","status-publish","has-post-thumbnail","product_cat-rotary","first","instock","shipping-taxable","product-type-simple"],"_links":{"self":[{"href":"https:\/\/agriculturalgearboxes.top\/ru\/wp-json\/wp\/v2\/product\/4065","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/agriculturalgearboxes.top\/ru\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/agriculturalgearboxes.top\/ru\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/agriculturalgearboxes.top\/ru\/wp-json\/wp\/v2\/comments?post=4065"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/agriculturalgearboxes.top\/ru\/wp-json\/wp\/v2\/media\/4067"}],"wp:attachment":[{"href":"https:\/\/agriculturalgearboxes.top\/ru\/wp-json\/wp\/v2\/media?parent=4065"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/agriculturalgearboxes.top\/ru\/wp-json\/wp\/v2\/product_brand?post=4065"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/agriculturalgearboxes.top\/ru\/wp-json\/wp\/v2\/product_cat?post=4065"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/agriculturalgearboxes.top\/ru\/wp-json\/wp\/v2\/product_tag?post=4065"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}