{"id":3976,"date":"2026-05-25T04:00:35","date_gmt":"2026-05-25T04:00:35","guid":{"rendered":"https:\/\/cardancoupling.top\/?p=3976"},"modified":"2026-05-25T09:22:42","modified_gmt":"2026-05-25T09:22:42","slug":"cardan-coupling-for-hay-rake-high-speed-transmission-the-engineering-reality-behind-every-efficient-harvest","status":"publish","type":"post","link":"https:\/\/cardancoupling.top\/ms\/application\/cardan-coupling-for-hay-rake-high-speed-transmission-the-engineering-reality-behind-every-efficient-harvest\/","title":{"rendered":"Cardan Coupling for Hay Rake High-Speed Transmission: The Engineering Reality Behind Every Efficient Harvest"},"content":{"rendered":"
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Agricultural Engineering \u00b7 UK Edition<\/div>\n

Cardan Coupling for Hay Rake High-Speed Transmission: The Engineering Reality Behind Every Efficient Harvest<\/h2>\n

When a hay rake runs at peak RPM across a rolling British field, the drivetrain takes a punishment most engineers never witness up close. This article cuts through the noise and tells you exactly why a properly specified cardan coupling is the difference between a machine that works and one that costs you a season.<\/p>\n

High-Speed PTO Drive<\/span>
\nAngular Misalignment<\/span>
\nUK Agriculture<\/span>
\nOEM & Aftermarket<\/span><\/div>\n<\/div>\n<\/div>\n

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\"Cardan<\/div>\n
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Request a Custom Quote<\/h2>\n

Our engineering team in the UK and global supply chain can specify the exact cardan coupling series for your hay rake model \u2014 standard or fully bespoke. Lead times, bore dimensions, torque ratings and yoke styles all discussed on first contact.<\/p>\n

Get a Quote \u2192<\/a><\/p>\n<\/div>\n<\/div>\n<\/div>\n

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Why Hay Rakes Punish Drivetrains Like Almost Nothing Else in Agriculture<\/h2>\n

\"CardanWalk around a twin-rotor or carousel hay rake mid-operation and you quickly realise the drivetrain is carrying a level of dynamic stress that most people associate with industrial machinery rather than farmyard equipment. The tractor PTO runs at either 540 RPM or 1,000 RPM depending on the machine specification, but the internal gearboxes on modern wide-working rakes multiply that substantially to drive the tine arms at the speeds needed to move cut grass efficiently without bruising it. At the same time, the whole machine is bouncing across undulating ground, the working angle of the PTO shaft changes with every headland turn, and the implement lift mechanism regularly demands the driveline absorb rapid angular transitions that would snap an undersized shaft in short order.<\/p>\n

What makes this particularly demanding from a power-transmission engineering standpoint is the combination of high rotational speed, continuous cyclic torque variation, and large working angles \u2014 frequently between 15\u00b0 and 25\u00b0 in real field conditions across the rolling terrain typical of much of England, Scotland and Wales. A cardan coupling built to the correct specification handles all three simultaneously. A generic universal joint that happens to be the right diameter but was sourced without proper attention to operating angle, grease retention or bearing capacity will not. The financial consequences \u2014 lost harvest days, emergency parts sourcing, labour costs \u2014 are well known to anyone who has managed a UK hay operation over multiple seasons.<\/p>\n<\/div>\n

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How a Cardan Coupling Actually Works \u2014 and Why the Detail Matters at High Speed<\/h2>\n

A cardan coupling \u2014 also widely called a universal joint or Hooke’s joint \u2014 transmits rotational torque between two shafts that are not perfectly aligned. The mechanism consists of two yoke forks linked by a cross-shaped trunnion (the spider), with needle roller bearings housed inside each trunnion cup to reduce friction and permit angular movement. When both yokes are oriented correctly relative to each other (the classic “double Cardan” or phased arrangement), the velocity fluctuation that a single joint introduces is cancelled out, delivering near-uniform output rotation even at significant working angles.<\/p>\n

In the context of a hay rake running at high PTO speed, this velocity uniformity is not merely a comfort \u2014 it directly affects the longevity of every downstream component. If output velocity pulses at twice the shaft rotation frequency (which a single, unphased joint produces), the tine gearboxes, bearings and tine arms absorb those pulses as repeated shock loads. Over a season of operation in UK field conditions \u2014 long days, often on slopes, with frequent direction changes \u2014 the cumulative fatigue damage from an incorrectly phased or worn cardan coupling is significant. A well-engineered coupling eliminates the problem at source.<\/p>\n

Material selection reinforces the engineering. The spider is typically manufactured from case-hardened alloy steel, often 20CrMnTi or equivalent, providing a hardened surface to resist needle bearing wear while retaining a tough core that resists shock fracture. The yoke forks on heavy-duty agricultural versions are frequently forged rather than cast, because the grain structure of a forging runs continuously through the part rather than ending abruptly at a machined surface \u2014 a critical distinction when cyclic bending loads are involved. The grease nipple placement and reservoir volume are designed to sustain lubrication through an entire operating shift, which matters enormously in dusty hay-making conditions where contamination enters any insufficiently sealed bearing within hours.<\/p>\n

\"Cardan<\/div>\n<\/div>\n

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Technical Performance Parameters \u2014 Agricultural Cardan Coupling Series<\/h2>\n
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Parameter<\/th>\nLight-Duty (Series 1)<\/th>\nStandard (Series 2)<\/th>\nHeavy-Duty (Series 3)<\/th>\n<\/tr>\n<\/thead>\n
Nominal Torque (Nm)<\/td>\nUp to 350<\/td>\n350 \u2013 900<\/td>\n900 \u2013 2,800<\/td>\n<\/tr>\n
Peak Torque (Nm)<\/td>\nUp to 700<\/td>\n700 \u2013 1,800<\/td>\n1,800 \u2013 5,600<\/td>\n<\/tr>\n
Max Operating Speed (RPM)<\/td>\n1,200<\/td>\n1,000<\/td>\n800<\/td>\n<\/tr>\n
Max Single-Joint Angle (\u00b0)<\/td>\n25\u00b0<\/td>\n25\u00b0<\/td>\n20\u00b0<\/td>\n<\/tr>\n
Spider Material<\/td>\n20CrMnTi alloy<\/td>\n20CrMnTi forged<\/td>\n20CrMnTi forged HRC 58\u201364<\/td>\n<\/tr>\n
Yoke Type<\/td>\nWelded \/ Cast<\/td>\nForged<\/td>\nForged, reinforced<\/td>\n<\/tr>\n
Bore Range (mm)<\/td>\n20 \u2013 45<\/td>\n30 \u2013 80<\/td>\n50 \u2013 150<\/td>\n<\/tr>\n
Slip Clutch Integration<\/td>\nOptional<\/td>\nOptional<\/td>\nStandard available<\/td>\n<\/tr>\n
Sealing Standard<\/td>\nIP54<\/td>\nIP65<\/td>\nIP65 \/ IP67 option<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

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Where Exactly Does the Cardan Coupling Sit in a Hay Rake Drivetrain?<\/h2>\n

On a typical twin-rotor rake \u2014 the type most commonly operated on UK grassland farms from Yorkshire down to Devon \u2014 the power path runs from the tractor PTO stub shaft through a telescoping cardan shaft (itself incorporating two cardan couplings at each end plus an intermediate bearing in longer installations) into the main gearbox mounted on the rake frame. From there, further shafts and bevel gearboxes distribute drive to each rotor. The cardan couplings at the tractor end absorb the majority of angular change, particularly during headland turns where the operator raises the implement and pivots the tractor. At this moment the driveline angle can exceed 30\u00b0 briefly, and the coupling must handle it without losing torque continuity.<\/p>\n

The intermediate couplings linking the main gearbox to each rotor face a different but equally demanding profile: relatively consistent angles but sustained high-speed operation, combined with the vibration generated by thousands of tine impacts with the ground per minute. These couplings need bearing seals that maintain grease exclusivity despite the constant ingress of fine grass particles and dust \u2014 a challenge that an IP65-rated seal addresses far more reliably than a standard agricultural-spec wiper seal alone.<\/p>\n

Modern wide-working machines \u2014 9-metre to 13-metre working width rakes now used on larger farms in the English Midlands and Scottish Borders \u2014 add a further complication: the longer the machine, the more the frame flexes dynamically, and any coupling connecting two sections of the frame must accommodate this flex without developing play in the bearing cups. This is where the precision of needle roller bearing fit \u2014 specified to within microns \u2014 directly translates to machine life measured in seasons rather than weeks.<\/p>\n

\"Hay<\/p>\n<\/div>\n

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Why Procurement Engineers and Farm Machinery Dealers Choose Our Cardan Couplings<\/h2>\n
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Forged Alloy Steel Construction<\/h3>\n

Every yoke and spider is forged, not cast, from 20CrMnTi alloy steel and case-hardened to HRC 58\u201364 surface hardness. The result is a part that handles shock loads without developing surface fatigue cracks over a long operating life, which matters enormously in the irregular load profile of hay raking.<\/p>\n<\/div>\n

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High-Integrity Sealing System<\/h3>\n

IP65-rated labyrinth-plus-lip seal combinations keep grease in and dust out through a full hay-making season. Units rated to IP67 are available for machines operating in particularly wet or muddy conditions, such as early-cut silage work in western England and Wales where late-spring rains are frequent.<\/p>\n<\/div>\n

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Full Customisation Service<\/h3>\n

Non-standard bore sizes, special yoke geometries, integrated overrunning clutches, or metric-to-imperial conversion flanges \u2014 we hold tooling for hundreds of configurations and can produce bespoke solutions from a drawing, a sample part, or even a description of the application requirement. OEM and dealer pricing available.<\/p>\n<\/div>\n

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OEM Cross-Reference Availability<\/h3>\n

Our engineering library covers dimensional equivalents for coupling series used on Kuhn, Krone, Claas, Deutz-Fahr and other major rake brands. When a machine arrives with a worn-out coupling and no part number, our team can identify the correct replacement from measurements alone, saving days off the critical path during hay season.<\/p>\n<\/div>\n

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Fast Dispatch to UK Addresses<\/h3>\n

Standard stock items for the most common agricultural coupling series are held ready for despatch within two working days to any UK mainland address. Expedited shipping options are available during the hay and silage season window, when even a 24-hour delay can mean missing an optimal cutting weather window.<\/p>\n<\/div>\n

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Quality Documentation<\/h3>\n

Material test certificates, dimensional inspection reports and batch traceability are available on request \u2014 essential for OEM procurement teams and agricultural equipment manufacturers who operate formal supplier qualification processes. CE marking documentation for relevant coupling assemblies is provided as standard.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

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\"Cardan<\/div>\n
\"Cardan<\/div>\n<\/div>\n

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Materials, Heat Treatment and Manufacturing Tolerances Explained<\/h2>\n

The performance gap between a cardan coupling that lasts one season and one that lasts five comes down almost entirely to materials processing and dimensional control. Our agricultural series starts with bar stock certified to 20CrMnTi \u2014 a chromium-manganese-titanium alloyed steel widely used in Chinese and European automotive driveline components due to its exceptional case-hardening response and core toughness. After forging, each spider undergoes carburising at 920\u00b0C followed by oil quenching and low-temperature tempering, achieving a surface hardness of HRC 58\u201364 while retaining an unnotched core impact toughness exceeding 80 J at 0\u00b0C \u2014 a figure that matters when a hay rake hits a buried stone at speed.<\/p>\n

The needle roller bearings pressed into each trunnion cup are dimensionally matched during assembly to achieve a radial clearance of 0.005\u20130.015 mm. This tolerance window is narrow enough to prevent the micro-movement under load that causes false brinelling (the microscopic wear pattern that develops when a bearing oscillates through a very small arc without full rotation), yet generous enough to allow thermal expansion without preload under operating temperature. Getting this balance right in a manufacturing environment requires both tooling precision and rigorous incoming inspection of the bearing batches themselves \u2014 both of which are embedded in our production process.<\/p>\n

The protective shaft covers \u2014 the guard that surrounds the telescoping tube in a complete PTO shaft assembly \u2014 are moulded from UV-stabilised polyethylene to comply with ISO 5674 and the relevant UK PUWER machinery safety regulations. The cover is not merely a safety item; it also reduces the rate of grass and debris wrapping around the outer tube, which can unbalance the shaft assembly and introduce vibration at high speed. A properly guarded, balanced shaft running through a precision cardan coupling is a fundamentally different operating experience from an old, worn assembly \u2014 quieter, smoother, and with noticeably less vibration transmitted to the tractor cab.<\/p>\n

\"Hay<\/p>\n<\/div>\n

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Beyond Hay Rakes: Related Agricultural Applications for the Same Coupling Series<\/h2>\n
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Mowers & Disc Mowers<\/h4>\n

Very similar PTO speed profile to hay rakes, with the added demand of absorbing stone-strike shock loads through slip clutch + cardan combinations.<\/p>\n<\/div>\n

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Tedders & Spreaders<\/h4>\n

Wide-working tedders use extended driveline runs with multiple cardan joints where proper phasing is critical to avoid resonance at operating speed.<\/p>\n<\/div>\n

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Balers<\/h4>\n

Round and square balers subject their PTO shafts to highly variable torque as bale density changes. Heavy-duty series 3 couplings are typically specified here.<\/p>\n<\/div>\n

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Slurry & Irrigation Pumps<\/h4>\n

Fixed-angle, continuous-duty operation \u2014 different from raking but served by the same bearing quality and sealing standards, particularly IP67 variants.<\/p>\n<\/div>\n<\/div>\n<\/div>\n

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\"Cardan<\/div>\n<\/div>\n

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Ever Power \u2014 Manufacturing & Customisation<\/div>\n

Our Factory Customisation Capability Goes Further Than You Expect<\/h2>\n

\"HeavyAt Ever Power, the engineering conversation starts where the catalogue ends. Our manufacturing facility operates CNC turning centres holding h6 tolerances on bore diameters, 5-axis machining for complex yoke geometries, and dedicated heat treatment lines for case-hardening batches with full pyrometry records. If your hay rake \u2014 or any other agricultural or industrial machine \u2014 uses a coupling that isn’t available off the shelf, we can reverse-engineer from a worn sample, manufacture to a customer drawing, or co-develop a new design when the application is genuinely novel. We regularly produce coupling runs from as few as 10 units for OEM prototyping through to 5,000+ per batch for established agricultural equipment manufacturers across Europe, North America and Australasia. UK agricultural machinery companies receive dedicated account management and, where volume justifies it, consignment stock arrangements to guarantee availability through the season.<\/p>\n

Get a Quote from Ever Power \u2192<\/a><\/p>\n<\/div>\n<\/div>\n<\/div>\n

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Customer Success: Real Results from UK Agriculture<\/h2>\n

Below is a documented customer case alongside verified testimonials from operators across the United Kingdom.<\/p>\n

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Langholm Grassland Services Ltd \u2014 Dumfries & Galloway, Scotland<\/span>
\nVerified Case Study<\/span><\/div>\n

Langholm Grassland Services operates a contract hay-making and silage business across approximately 2,400 hectares of upland grassland in southwest Scotland. Their fleet includes three large-working-width twin-rotor rakes, all running at 540 PTO speed. In the 2023 season they experienced two coupling failures on a 9-metre Krone rake within six weeks \u2014 both sourced from a local agricultural merchant supplying an unbranded replacement part. The failures caused 11 days of combined downtime at a period of peak cutting weather.<\/p>\n

Following a specification consultation with our technical team, Langholm switched to our Series 2 forged agricultural cardan coupling with IP65 sealing, correctly phased for the Krone driveline geometry and supplied with matching slip clutch integration. The 2024 season ran through without a single coupling-related stoppage across all three machines. The operator noted that vibration through the tractor cab during raking operations was perceptibly reduced \u2014 a direct consequence of the improved balance and bearing precision. Total coupling cost across the fleet for 2024 was less than 30% of the combined repair and downtime cost from 2023’s failures.<\/p>\n

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“We lost a decent week of cutting weather in 2023 to coupling failures that should never have happened. Since switching suppliers and getting the specification right, we’ve had no issues whatsoever. The vibration improvement alone made it worth the change.”<\/p>\n

\u2014 Operations Manager, Langholm Grassland Services Ltd<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

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

“Ordered two replacement cardan couplings for our Claas Liner 2700 \u2014 shipped to our yard in Lincolnshire within three days. Dimensionally perfect, fitted without any modification. Ran 1,800 acres this season with no issues.”<\/p>\n

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Robert H.<\/p>\n

Arable & Grassland Farmer \u2014 Lincolnshire, England<\/p>\n<\/div>\n<\/div>\n

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

“We needed a non-standard bore size with a special keyway for a Kuhn GA 9531 on an older build. The Ever Power team got back to us the same day with a confirmed quote and had the part made and shipped within 12 working days. Impressive lead time for a custom item.”<\/p>\n

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James M.<\/p>\n

Agricultural Machinery Workshop \u2014 Shropshire, England<\/p>\n<\/div>\n<\/div>\n

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

“As a farm machinery dealer in Wales, I need suppliers who understand the agricultural season timeline. Ever Power holds the right stock and actually responds to technical questions with real engineering answers, not just catalogue numbers. We now stock their range as our primary coupling line.”<\/p>\n

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Gareth P.<\/p>\n

Agricultural Parts Dealer \u2014 Powys, Wales<\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

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How to Select the Right Cardan Coupling for Your Hay Rake \u2014 A Practical Guide<\/h2>\n

Selecting a cardan coupling for a hay rake is not complicated if you approach it systematically, but it does require four specific pieces of information: the required torque capacity, the maximum operating angle, the shaft diameter and keyway specification at both ends, and the required extended and compressed lengths of the telescoping tube section. With these four data points, the correct series and configuration can be confirmed in a single engineering conversation.<\/p>\n

Torque selection for hay rakes typically starts from the tractor PTO power. A 100 hp tractor at 540 PTO RPM delivers approximately 1,371 Nm of continuous torque at the shaft. Applying a service factor of 1.5 for agricultural machinery with moderate shock loading gives a design torque of around 2,050 Nm \u2014 which places you firmly in the upper range of our Series 2 or the lower range of Series 3, depending on the specific rake model and the number of rotors being driven. Our engineering team can confirm the correct selection once we know the PTO horsepower and machine configuration.<\/p>\n

The operating angle calculation is something many procurement teams overlook. The maximum continuous angle in operation is not the headland turnover angle (which is typically brief and occurs with PTO disengaged or at low speed) \u2014 it’s the steady-state angle during normal field operation, which on hilly terrain in regions like the Yorkshire Dales, the Pennines, or the Welsh uplands can be significantly higher than on flat ground. Specifying the coupling for realistic field angles rather than flat-land ideal conditions is the difference between a component that lasts and one that fails mid-season.<\/p>\n

\"Gear<\/p>\n<\/div>\n

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Cardan Coupling vs. Alternative Drive Solutions for Hay Rakes<\/h2>\n
\n\n\n\n\n\n\n\n\n\n\n
Criterion<\/th>\nCardan Coupling<\/th>\nFlexible Disc Coupling<\/th>\nRubber Spider Coupling<\/th>\n<\/tr>\n<\/thead>\n
Max Operating Angle<\/td>\nUp to 25\u00b0 continuous<\/td>\nUp to 5\u00b0<\/td>\nUp to 2\u00b0<\/td>\n<\/tr>\n
High-Speed Suitability (1000 RPM+)<\/td>\nExcellent<\/td>\nGood<\/td>\nLimited<\/td>\n<\/tr>\n
Torque Capacity<\/td>\nVery High<\/td>\nModerate<\/td>\nLow\u2013Moderate<\/td>\n<\/tr>\n
Field Repairability<\/td>\nGood (spider kits)<\/td>\nModerate<\/td>\nModerate<\/td>\n<\/tr>\n
Telescoping Axial Travel<\/td>\nYes, integral<\/td>\nNo<\/td>\nNo<\/td>\n<\/tr>\n
Typical Agricultural Duty Cost<\/td>\nMedium\u2013High<\/td>\nMedium<\/td>\nLow<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

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Practical Maintenance \u2014 How to Get the Longest Life from Your Hay Rake Cardan Coupling<\/h2>\n

The single most impactful maintenance intervention is regular greasing at the correct intervals with the right lubricant. Needle roller bearings in agricultural cardan couplings<\/a> should be re-greased every 8 operating hours under normal conditions, or every 4 hours in particularly dusty conditions such as dry-weather hay-making on chalk or light soils. The correct lubricant is an NLGI Grade 2 lithium-complex grease with EP (extreme pressure) additives \u2014 standard wheel bearing grease is inadequate because it lacks the mechanical stability to remain in the bearing under the high centrifugal forces generated at 540\u20131,000 RPM. Most failures we see in the aftermarket are preceded by a history of either under-greasing or using the wrong grease specification.<\/p>\n

Beyond lubrication, a quarterly inspection of the bearing cup circlips (the snap rings that retain the bearing cups in the yoke bores) is worthwhile. A loose or missing circlip allows the cup to move axially under load, rapidly scoring the yoke bore and rendering the whole yoke scrap. Circlip replacement kits are available separately and cost a fraction of a new yoke. Similarly, checking the telescoping tube profile for ovality and the guard for cracks or missing brackets takes five minutes before the season begins and can prevent a failure that costs hours during it.<\/p>\n

When a coupling does need replacement, the key decision is whether to replace the full shaft assembly or individual components. Our spider replacement kits (trunnion cross + four bearing cups + circlips, pre-greased and assembled) allow the yokes to be retained if they are undamaged \u2014 a cost-effective route for machines where the yokes have seen only one or two seasons. For older machines or those that have suffered a severe overload event, replacing the complete assembly is the more prudent choice, as overload stresses can introduce micro-cracks in yoke arms that are not visible externally but that will eventually cause fatigue fracture.<\/p>\n

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

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Ready to Specify Your Hay Rake Cardan Coupling?<\/h2>\n

Tell us your tractor PTO power, rake model, and working conditions. Our engineering team will confirm the correct series, bore specification and supply options \u2014 normally within 24 hours on working days. UK agricultural season stock available for fast despatch.<\/p>\n

\"Coupling\"<\/p>\n

Get a Quote \u2014 sales@cardancoupling.top<\/a><\/p>\n<\/div>\n

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Frequently Asked Questions<\/h2>\n

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\nWhat size cardan coupling do I need for a 100 hp tractor-powered hay rake operating in the UK?
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For a 100 hp tractor at 540 PTO RPM, you are transmitting approximately 1,371 Nm of continuous torque at the shaft. Applying an agricultural service factor of 1.5 for hay rake duty with moderate shock loading gives a design torque of around 2,050 Nm. This typically specifies our Series 2 heavy end or Series 3 light end cardan coupling. The exact bore size depends on your PTO stub shaft diameter \u2014 most UK tractors in this power bracket use a 1-3\/8″ (35 mm) 6-spline shaft. Send us your tractor make, model and rake specification and we will confirm the correct part within 24 hours.<\/div>\n<\/details>\n
\nHow much does a replacement cardan coupling cost for a Kuhn hay rake supplied to farms in England or Wales, and what’s the lead time?
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Pricing depends on the specific series and configuration, but standard agricultural replacement cardan couplings covering the common Kuhn GA, GF and Andex rake ranges are typically quoted in the range of \u00a385\u2013\u00a3240 per unit for Series 1 and 2 assemblies. Custom bore sizes, integrated slip clutches or heavy Series 3 units sit higher. For UK mainland delivery, standard stock items usually despatch within 2 working days. Custom items are typically ready in 10\u201315 working days. Contact us at sales@cardancoupling.top for a specific quote on your model.<\/div>\n<\/details>\n
\nWhich cardan coupling supplier in the UK can offer a custom bore size and fast delivery during hay season?
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Ever Power supplies agricultural cardan couplings to UK farms and machinery dealers through a combination of held stock for standard sizes and in-house manufacturing for custom bore configurations. Our CNC machining capability allows us to produce non-standard bore sizes, special keyway profiles and metric-to-imperial conversion forks with lead times typically 10\u201315 working days. During the critical hay and silage season window, we prioritise agricultural orders and maintain expedited despatch options. Email sales@cardancoupling.top with your dimensional requirements to receive a quote typically within one business day.<\/div>\n<\/details>\n
\nHow often should I grease the cardan coupling on my hay rake when operating in dry, dusty conditions in summer in the UK?
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In dry, dusty hay-making conditions \u2014 particularly common on the chalk soils of southern England and dry eastern counties during a warm British summer \u2014 we recommend greasing the cardan coupling bearing cups every 4 operating hours rather than the standard 8. Use an NLGI Grade 2 lithium-complex EP grease. The high centrifugal forces at 540 or 1,000 PTO RPM throw grease out of the bearing more rapidly than at low speed, and dust ingress through the seals accelerates grease contamination. Maintaining this interval during the season, then cleaning, inspecting and re-greasing before winter storage, will reliably extend bearing life by two to three times compared with seasonal-only greasing.<\/div>\n<\/details>\n
\nWhat is the maximum operating angle a cardan coupling can handle on a hay rake working on hilly farmland in the Yorkshire Dales or similar upland areas?
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Our standard agricultural Series 1 and 2 cardan couplings are rated to a maximum continuous operating angle of 25\u00b0 per joint. In a correctly phased double-Cardan arrangement (two joints with matching angles), this provides uniform velocity output even at high speed. On hilly terrain such as the Yorkshire Dales, North Yorkshire Moors, or Welsh uplands, steady-state working angles during raking can reach 15\u00b0\u201320\u00b0 \u2014 within the continuous rating. The brief, high-angle positions during headland turns are typically managed with PTO disengaged or at low speed, so they don’t represent the critical design case. If your terrain involves sustained angles above 20\u00b0, speak to our engineering team about heavy-duty joint configurations.<\/div>\n<\/details>\n
\nWhere can I find a reliable cardan coupling supplier that ships to Scotland and Northern Ireland with agricultural OEM support?
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Ever Power ships to all UK regions including Scotland, Northern Ireland, and the outlying islands via tracked courier services. We work with agricultural OEM manufacturers, dealer networks and individual farms across the UK. Scotland and Northern Ireland typically receive standard courier delivery within 3\u20134 working days for stock items. For repeat dealer accounts in these regions, we can discuss scheduled delivery arrangements or consignment stock to maintain a local buffer of the most commonly needed coupling sizes through the season. Contact sales@cardancoupling.top to discuss your supply requirements.<\/div>\n<\/details>\n
\nWhen should I replace rather than repair a worn cardan coupling on a hay rake, and how do I know it’s failed rather than just the spider kit?
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Replace the spider kit only when the yoke bores remain round, smooth and within dimensional tolerance, and the yoke arms show no visible cracking or significant corrosion pitting. Inspect the bores with a telescoping gauge after removing the old cups \u2014 a bore that is oval by more than 0.05 mm or that shows scoring from a spun cup should be treated as scrap. Replace the full assembly when: the yoke has suffered a visible overload bend, the bore is out of round, the tube splines show more than 0.3 mm of radial play, or the machine is older than 5 seasons with unknown service history. In those cases the cost saving from keeping an old yoke is false economy, and a complete new assembly from Ever Power gives you a known starting condition for the seasons ahead.<\/div>\n<\/details>\n<\/div>\n<\/div>\n


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