{"id":3567,"date":"2026-05-19T03:38:42","date_gmt":"2026-05-19T03:38:42","guid":{"rendered":"https:\/\/cardancoupling.top\/?p=3567"},"modified":"2026-05-19T07:00:37","modified_gmt":"2026-05-19T07:00:37","slug":"cardan-coupling-for-hay-rake-agricultural-pto-drive-systems","status":"publish","type":"post","link":"https:\/\/cardancoupling.top\/ro\/application\/cardan-coupling-for-hay-rake-agricultural-pto-drive-systems\/","title":{"rendered":"Cardan Coupling for Hay Rake & Agricultural PTO Drive Systems"},"content":{"rendered":"
\n
\n
<\/div>\n
Agricultural Machinery<\/div>\n

Cardan Coupling for Hay Rake & Agricultural PTO Drive Systems<\/h2>\n

How heavy-duty universal joint driveshafts keep British farms running \u2014 from compact tractor attachments to large-scale hay rake operations across England, Scotland, and Wales.<\/p>\n

\ud83d\udce7 Get a Quote<\/a>
\n\ud83d\udccd Serving UK Farms & Dealers<\/span><\/div>\n<\/div>\n
\n
\n

\"HeavyWalk across any working farm in England during the summer haymaking season and the sight of a tractor pulling a hay rake across a broad meadow is as familiar as the smell of fresh-cut grass. Behind that deceptively simple machine is a precise, hard-working mechanical chain \u2014 and at the heart of that chain sits a cardan coupling, more commonly known on the farm as a PTO driveshaft or agricultural universal joint. Without a properly specified cardan coupling, the power from the tractor’s Power Take-Off shaft never reaches the hay rake’s rotor, and the whole operation stops cold.<\/p>\n

This article draws on more than 18 years of field engineering experience and direct interaction with British farm machinery dealers, OEM integrators, and contract farming operations across the UK. The goal is straightforward: give you the technical grounding you need to select, specify, and maintain cardan couplings for hay rakes and the broader world of tractor PTO-driven agricultural machinery \u2014 without the guesswork.<\/p>\n<\/div>\n<\/div>\n

\n
\n
\"Agricultural<\/div>\n
\n

Ever Power Cardan Coupling<\/h2>\n

Engineered for demanding agricultural environments, Ever Power’s range of agricultural cardan couplings covers standard 6-spline and 21-spline PTO profiles, wide-angle cross joints for tight headland turns, and overload-protection clutch assemblies specifically designed for the shock loads a hay rake imposes on a drivetrain.<\/p>\n

Request Product Specs \u2192<\/a><\/p>\n<\/div>\n<\/div>\n<\/div>\n

\n

What Exactly Is a Cardan Coupling and Why Does It Matter on a Hay Rake?<\/h2>\n
\n
\n

A cardan coupling \u2014 named after the 16th-century Italian mathematician Gerolamo Cardano \u2014 is a mechanical device that transmits rotational torque between two shafts whose axes are not perfectly aligned. In agricultural machinery, this is not a marginal engineering case; it is the everyday reality. A tractor’s PTO stub sits at a fixed height, while the hay rake’s input gearbox may be angled anywhere from a few degrees on flat ground to 30\u00b0 or more when working on a hillside field in the Yorkshire Dales or the South Downs.<\/p>\n

The Cardan joint \u2014 also called a universal joint, U-joint, or Hooke’s joint \u2014 achieves this angular flexibility through a cruciform (cross-shaped) yoke arrangement. Two yokes, each attached to a shaft, are connected by a cross-piece bearing. As the driving shaft rotates, the cross transmits torque to the driven shaft even when the two shafts are at an angle. In practice, agricultural PTO driveshafts use two such joints in series \u2014 a double-cardan arrangement \u2014 which cancels out the velocity fluctuation inherent in a single joint and delivers smooth, consistent rotational speed to the implement’s gearbox.<\/p>\n<\/div>\n

\n

\"Cardan<\/p>\n

\n

\ud83d\udca1 Engineering Note: For hay rakes, the operating angle of the cardan coupling rarely stays constant. As the rake’s tine rotor flexes over undulating ground, the driveshaft angle changes dynamically. This is why proper joint selection \u2014 especially the use of wide-angle joints rated to 80\u00b0 \u2014 matters so much in real field conditions.<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

\n

How a Hay Rake Drivetrain Actually Works \u2014 The Engineering Chain<\/h2>\n

Understanding where the cardan coupling fits in the overall system makes it far easier to specify the right unit. A modern rotary hay rake \u2014 whether a twin-rotor tedder-rake or a large multi-rotor merger rake used on dairy farms in Devon or Cheshire \u2014 receives its drive power from the tractor’s rear PTO shaft, typically running at either 540 RPM or 1000 RPM depending on the tractor model and implement requirement.<\/p>\n

\n
\n
\u2699<\/div>\n

Step 1: PTO Output<\/p>\n

Tractor PTO shaft rotates at 540 or 1000 RPM. The splined stub transmits torque to the driveshaft.<\/p>\n<\/div>\n

\n
\ud83d\udd17<\/div>\n

Step 2: Cardan Coupling<\/p>\n

The driveshaft with two U-joints bridges the angular misalignment between tractor and implement, transmitting full torque.<\/p>\n<\/div>\n

\n
\ud83d\udcc8<\/div>\n

Step 3: Input Gearbox<\/p>\n

The implement’s central gearbox receives rotation and distributes it \u2014 often at reduced speed \u2014 to the rotor drive shafts.<\/p>\n<\/div>\n

\n
\ud83c\udf3f<\/div>\n

Step 4: Rotor & Tines<\/p>\n

Rotor spins, spring tines sweep the cut grass into windrows ready for baling or further drying.<\/p>\n<\/div>\n<\/div>\n

The cardan coupling in Step 2 is arguably the most mechanically stressed component in that chain. It must handle not only the steady-state torque of spinning a loaded rotor, but also the sudden impact loads that occur when a tine hits an embedded stone, a mole-hill, or a particularly dense patch of wet grass. These shock pulses can reach 3\u20135 times the nominal torque in an instant, and a coupling that is marginally sized will fail \u2014 usually at the worst possible moment, during peak haymaking weather with a contractor deadline looming.<\/p>\n<\/div>\n

\n

Agricultural Cardan Coupling in Action<\/h2>\n
\n
\n

\"Cardan<\/p>\n

Hay Rake Field Operation<\/div>\n<\/div>\n
\n

\"Agricultural<\/p>\n

Universal Joint Assembly<\/div>\n<\/div>\n<\/div>\n<\/div>\n
\n

Technical Parameters: Ever Power Agricultural Cardan Coupling<\/h2>\n

The table below summarises the key specifications of the Ever Power agricultural cardan coupling series most commonly used on hay rakes and similar tractor-driven implements in the UK market. All parameters are verified at our manufacturing facility and comply with ISO 5673 (agricultural machinery \u2014 PTO drive shafts) and EN 12965 standards.<\/p>\n

\n\n\n\n\n\n\n\n\n
Series<\/th>\nTorque Rating<\/th>\nMax Speed (RPM)<\/th>\nMax Joint Angle<\/th>\nSpline Profile<\/th>\nOverload Clutch<\/th>\nMaterial<\/th>\n<\/tr>\n<\/thead>\n
EP-AG1<\/td>\nUp to 350 Nm<\/td>\n540 \/ 1000<\/td>\n25\u00b0<\/td>\n6-spline Z6<\/td>\nOptional<\/td>\nAlloy Steel + PE Guard<\/td>\n<\/tr>\n
EP-AG2<\/td>\nUp to 800 Nm<\/td>\n540 \/ 1000<\/td>\n35\u00b0<\/td>\n6-spline \/ 21-spline<\/td>\nStandard<\/td>\nBoron Steel, Induction Hardened<\/td>\n<\/tr>\n
EP-WA (Wide Angle)<\/td>\nUp to 650 Nm<\/td>\n540<\/td>\n80\u00b0<\/td>\n6-spline Z6<\/td>\nStandard<\/td>\nAlloy Steel, Chrome Plated Yokes<\/td>\n<\/tr>\n
EP-HT (Heavy Duty)<\/td>\nUp to 2,200 Nm<\/td>\n1000<\/td>\n30\u00b0<\/td>\n21-spline 1 3\/8″<\/td>\nStandard + Shear Bolt<\/td>\n42CrMo4 Steel, Heat Treated<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

* All torque values refer to nominal continuous ratings. Peak\/shock torque capacity is typically 3\u00d7 nominal. Custom lengths, spline profiles, and overload clutch settings available on request.<\/p>\n<\/div>\n

\n

Materials, Construction & Why They Matter on British Farms<\/h2>\n
\n
\n

The construction quality of a cardan coupling determines not just how long it lasts, but how safely and efficiently it operates under the wet, muddy, and abrasive conditions found on UK grassland farms. Ever Power uses 42CrMo4 chromium-molybdenum alloy steel for the cross journal (the spider) in all heavy-duty agricultural series. This grade offers a good combination of tensile strength (900\u20131100 MPa), toughness, and resistance to fatigue cracking \u2014 a crucial property when the cross journal is subjected to millions of bending cycles over a season.<\/p>\n

The sliding telescopic section \u2014 which allows the driveshaft to extend and retract as the tractor pitches relative to the implement \u2014 uses case-hardened splined tube sections. In the agricultural environment, this section is constantly exposed to grit, grass juice, and moisture. A cardan coupling without an adequate grease nipple on the telescopic section, combined with a well-fitted plastic guard, will corrode and seize within a single season in the Welsh uplands or the Somerset Levels where rainfall is high.<\/p>\n

All Ever Power agricultural PTO driveshafts come supplied with CE-marked plastic safety guards as standard \u2014 not optional. This is a legal requirement under UK PUWER regulations (Provision and Use of Work Equipment Regulations 1998) and the Agriculture (Tractor Cabs) Act framework for machinery guarding. The guard profile is designed to prevent entanglement while allowing easy removal for maintenance.<\/p>\n<\/div>\n

\n

\"Cardan<\/p>\n

\n
\n

Cross Journal<\/p>\n

42CrMo4 alloy steel, induction hardened to HRC 58\u201362 on bearing journals<\/p>\n<\/div>\n

\n

Yokes<\/p>\n

Drop-forged alloy steel, phosphated and painted for corrosion resistance<\/p>\n<\/div>\n

\n

Bearing Cups<\/p>\n

Needle roller bearings, pre-greased, with integral grease nipple fittings<\/p>\n<\/div>\n

\n

Guard System<\/p>\n

HDPE or PP co-moulded guard, CE-marked, compliant with UK PUWER<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

\n

Application Scenes: Where British Farmers Use Agricultural Cardan Couplings<\/h2>\n

The hay rake is the headline application, but the agricultural cardan coupling is a universal component that appears across dozens of farm implement types used throughout England, Scotland, and Wales. Here is a structured overview of the primary application categories.<\/p>\n

\n
\n
\ud83c\udf3f<\/div>\n

Hay Rake & Tedder<\/h3>\n

Rotary hay rakes and tedders are the primary application, operating at 540 RPM with frequent shock loads from tine-ground contact. Wide-angle joints essential for headland work. Common across dairy farms in Cheshire, Shropshire, and Somerset.<\/p>\n<\/div>\n

\n
\u2702\ufe0f<\/div>\n

Mowers & Disc Mowers<\/h3>\n

Reciprocating bar mowers and drum\/disc mowers require high-torque, vibration-resistant cardan couplings. Shock loads are severe when cutting mature grass or dealing with embedded debris. Both 540 and 1000 RPM profiles used depending on implement size.<\/p>\n<\/div>\n

\n
\ud83c\udf3a<\/div>\n

Fertiliser Spreaders<\/h3>\n

Twin-disc and spinner spreaders use PTO driveshafts typically rated at 200\u2013600 Nm. Steady-state operation but sensitive to unbalanced loads. Corrosion resistance is paramount given fertiliser dust exposure, particularly in East Anglian arable operations.<\/p>\n<\/div>\n

\n
\ud83d\udeb2<\/div>\n

Rotavators & Power Harrows<\/h3>\n

The most demanding PTO application in arable farming. Rotavators encounter stone strikes and hard pan soil that generate peak torques far exceeding nominal values. Only heavy-duty cardan couplings with friction or shear-bolt overload clutches should be used. Common on farms across the East Midlands and Lincolnshire.<\/p>\n<\/div>\n

\n
\ud83c\udfdb<\/div>\n

Slurry & Irrigation Pumps<\/h3>\n

Livestock farms \u2014 particularly intensive dairy operations in Yorkshire and Lancashire \u2014 use PTO-driven slurry pumps and raingun irrigation sets. These demand cardan couplings with excellent sealing and low backlash, as pump start-up loads can be significant in cold winter conditions.<\/p>\n<\/div>\n

\n
\ud83d\ude4b<\/div>\n

Bale Wrappers & Balers<\/h3>\n

Round balers and bale wrappers work directly downstream of the hay rake in the forage chain. They require precision-balanced driveshafts with low vibration at 540 RPM to avoid premature wear on the pickup tine mechanism and bale chamber feed rollers.<\/p>\n<\/div>\n<\/div>\n

\n\n\n\n\n\n\n\n\n\n
Implement<\/th>\nTypical PTO Speed<\/th>\nRecommended Series<\/th>\nOverload Protection<\/th>\nUK Region Example<\/th>\n<\/tr>\n<\/thead>\n
Hay Rake \/ Tedder<\/td>\n540 RPM<\/td>\nEP-WA \/ EP-AG2<\/td>\nFriction Clutch<\/td>\nSomerset, Cheshire, Shropshire<\/td>\n<\/tr>\n
Disc Mower<\/td>\n1000 RPM<\/td>\nEP-HT<\/td>\nShear Bolt<\/td>\nDevon, Cornwall, Wales<\/td>\n<\/tr>\n
Rotavator<\/td>\n540 \/ 1000 RPM<\/td>\nEP-HT<\/td>\nShear Bolt + Friction<\/td>\nLincolnshire, East Midlands<\/td>\n<\/tr>\n
Fertiliser Spreader<\/td>\n540 RPM<\/td>\nEP-AG1 \/ EP-AG2<\/td>\nOptional<\/td>\nEast Anglia, Yorkshire<\/td>\n<\/tr>\n
Round Baler<\/td>\n540 RPM<\/td>\nEP-AG2<\/td>\nFriction Clutch<\/td>\nNorthern England, Scotland<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n
\n

Why UK Agricultural Engineers Choose Ever Power Cardan Couplings<\/h2>\n

Choosing the right supplier for agricultural transmission components is not simply a price exercise \u2014 it is a decision that affects machine reliability, operator safety, and the total cost of the farming operation over multiple seasons.<\/p>\n

\"Ever<\/p>\n

 <\/p>\n

\n
\n
\u2705<\/div>\n

ISO 5673 & EN 12965 Compliance<\/p>\n

Every agricultural driveshaft is manufactured and tested against internationally recognised standards. UK buyers can rely on documentation packages suitable for CE compliance and PUWER assessments.<\/p>\n<\/div>\n

\n
\ud83d\udd25<\/div>\n

High Shock Load Capacity<\/p>\n

EP series couplings are rated for peak torques of 3\u00d7 nominal, confirmed by in-house fatigue testing. Needle bearing cups with integral seals resist grass juice and fine grit penetration, extending service intervals significantly.<\/p>\n<\/div>\n

\n
\ud83d\udd28<\/div>\n

Full Customisation Service<\/p>\n

Non-standard shaft lengths, spline profiles, clutch torque settings, guard colours, and special coatings are all available as bespoke orders. Minimum order quantities are flexible for UK dealers and OEM integrators building low volumes.<\/p>\n<\/div>\n

\n
\ud83c\udf0d<\/div>\n

Direct UK Stock & Fast Despatch<\/p>\n

Standard agricultural series are held in stock for rapid fulfilment to UK destinations. During the critical May\u2013July haymaking season, delivery lead times can be kept to 3\u20135 working days for most standard configurations.<\/p>\n<\/div>\n

\n
\ud83d\udccb<\/div>\n

Full Engineering Documentation<\/p>\n

Technical data sheets, 3D STEP files, installation guides, and maintenance schedules are provided with every order. Essential for OEM integrators and machinery dealers who need to maintain service records for their farm customers.<\/p>\n<\/div>\n

\n
\ud83d\udcc8<\/div>\n

Competitive OEM Pricing<\/p>\n

Volume pricing structures are available from 50 units per SKU. Long-term supply agreements with annual price stability are offered to UK agricultural machinery manufacturers and regional dealer groups.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

\n

Ever Power Manufacturing & Custom Cardan Coupling Solutions<\/h2>\n
\n
\n

Ever Power operates a dedicated manufacturing facility with over 12,000 m\u00b2 of production floor space, equipped with CNC turning centres, gear-hobbing machines, induction hardening lines, and precision assembly stations. The company holds ISO 9001 certification and subjects every production batch to hardness testing, dimensional inspection, and dynamic balance verification before despatch.<\/p>\n

What genuinely sets Ever Power apart in the agricultural cardan coupling market is the depth of the customisation service. UK dealers and OEM manufacturers who are building or servicing hay rakes, tedders, or other specialist grassland machinery can specify virtually every parameter of a driveshaft assembly:<\/p>\n