PTO Shaft for Hesston Discbine 1340, 1345 Disc Mower

Reliable PTO Shaft for Hesston Disc Mower Models

PTO Shaft for Hesston Disc Mower Model: 5512 Disc Mower

The PTO shaft for Hesston Discbine 1340 and 1345 from CMN Transmission is a heavy-duty, direct-fit tractor PTO drive shaft engineered to match the original Weasler 55N driveline in every critical dimension. Built around a CAT 6 Double Constant Velocity main shaft design, it accommodates the wide articulation angles inherent to discbine operation, where the cutterbar and conditioning unit must flex through irregular terrain without power interruption. The tractor end uses a standard 1.375-21 spline yoke (1-3/8" 21 spline) while the implement end connects via a 1.5" x 23 spline input shaft, reflecting the exact factory interface of the Hesston 1340 and 1345 machines. The 55N 80x50 Double CV joint configuration ensures smooth, vibration-free torque delivery even at full articulation, extending the service life of both the PTO drive shaft and the discbine gearbox components downstream.

In the field, this disc mower PTO shaft excels in high-demand hay harvesting, forage cutting, and silage production applications where a 12-foot cutterbar working at 2,600 disc RPM places enormous and continuous stress on the driveline. The integrated slip clutch protection shields the gearbox and tractor drivetrain from shock loads caused by rock strikes, heavy windrows, or sudden engagement. As a direct replacement of Weasler PTO shaft hardware, our unit is dimensionally identical and installs without modification. With PTO shaft dimensions and PTO shaft length verified against OEM drawings, operators can confidently fit this agricultural PTO shaft to their Hesston 1340 or 1345 and return to full productivity without costly dealer downtime. Available as a complete assembly or as individual PTO shaft parts including the tractor-side CV half, implement-side CV half, PTO shaft tube, and PTO shaft guard cover.

Main Shaft: CAT 6 Double Constant Velocity

Original equipment is 55N Weasler 80 degrees on the tractor side and a 50-degree CV on the discbine. Input shafts are usually 1.50" x 23 splines.

Hesston 1340/1345 Disc Mower Specifications

Features of PTO Shaft for Hesston Disc Mower

1. CAT 6 Double CV Precision Engineering
The CAT 6 Double Constant Velocity joint design is the engineering heart of this PTO driveline shaft. Unlike standard universal-joint shafts, the double CV configuration cancels the velocity fluctuation that occurs at high articulation angles, delivering a perfectly smooth rotational output to the discbine input gearbox at all steering and terrain positions. This eliminates the vibration that accelerates bearing wear in downstream gearboxes, directly extending the service interval of your entire driveline system and reducing unexpected field breakdowns.

2. Slip Clutch Overload Protection
This slip clutch PTO shaft features a factory-set torque-limiting slip clutch that activates instantly when the cutterbar encounters a hidden rock, fence post, or sudden shock load. The slip clutch dissipates impact energy by briefly decoupling the driveline instead of transmitting destructive torque spikes to the tractor gearbox, transmission, or discbine cutterbar gearboxes. This critical protection can prevent thousands of dollars in drivetrain repair costs from a single rock strike, making it an indispensable safety feature for high-speed disc mowing operations on any terrain.

3. Direct OEM-Match Spline Dimensions
Engineered as an exact-fit replacement of Weasler PTO shaft components, this shaft uses a 1.375-21 spline tractor yoke and a 1.5" x 23 spline implement yoke, matching the factory specification of the Hesston 1340 and 1345 discbines without requiring any adapters, machining, or shimming. Correct PTO shaft dimensions ensure full spline engagement depth, eliminating fretting wear caused by shallow engagement, and allowing the shaft to be installed by a single operator in under 15 minutes using standard hand tools.

4. Heavy-Duty Industrial Construction
Every component of this heavy duty PTO shaft is manufactured from high-grade alloy steel, precision CNC-machined and heat-treated to deliver superior hardness and fatigue resistance. The PTO shaft tubing is formed from seamless steel tube with precise wall thickness for optimal strength-to-weight balance. The PTO shaft yoke forgings are shot-blasted and phosphate-treated before assembly to maximize corrosion resistance in the harsh mud, moisture, and crop residue environment of daily discbine operation across multiple seasons.

5. Full-Coverage Safety Guard System
The complete PTO shaft guard and PTO shaft cover system meets CE and ISO safety regulations, enclosing the entire rotating assembly from tractor PTO stub to implement input flange. The interlocking plastic guard sections are designed for easy removal during service and reinstallation without tools. Guard retention chains and friction rings keep the outer shield stationary during operation, preventing rotation and entanglement hazards. This is not an optional afterthought but a core safety feature mandated in most international markets and essential for operator protection in all mowing conditions.

6. Modular Parts Availability
Unlike many aftermarket suppliers who only offer the complete assembly, CMN stocks all individual PTO shaft parts including the tractor-side 80-degree CV half, the implement-side 50-degree CV half, the telescoping PTO shaft tube, PTO shaft universal joint kits, PTO shaft adapter components, and replacement PTO shaft guard sections. This means that when a specific component wears out, you replace only what is needed, dramatically reducing total cost of ownership compared to purchasing an entire new custom PTO shaft assembly for every failure.

How Does the PTO Drive Shaft for Disc Mower Work

1. Power Extraction from the Tractor PTO
The operating cycle begins at the tractor's rear PTO stub shaft, which rotates at either 1000 RPM (the primary standard for the Hesston 1340/1345) or 540 RPM depending on the tractor configuration. The tractor PTO shaft yoke, featuring a 1.375-21 spline bore, engages the tractor stub with a positive-locking spring-loaded collar or a friction cone connection. Once engaged, engine torque is continuously transmitted through the yoke into the first CV joint of the PTO driveline shaft assembly. The 1000 RPM input is critical for driving the discbine cutterbar at the required 2,600 disc RPM through the machine's internal step-up gearbox system.

2. Double CV Joint Angular Compensation
The CAT 6 Double Constant Velocity design is the most important distinguishing feature of this PTO drive shaft. A standard single-joint cardan shaft produces velocity fluctuation at angles exceeding approximately 8-10 degrees, causing vibration that is destructive to gearbox bearings and input seals. With the Hesston discbine's drawbar swivel hitch and hydraulic tongue swing, operational angles between the tractor and implement regularly exceed 20-30 degrees during headland turns. The double CV configuration uses two opposing CV joints that mathematically cancel each other's velocity variance at any angle up to 80 degrees on the tractor side and 50 degrees on the implement side, producing a perfectly isochronous output regardless of articulation angle. This isochronous torque delivery is what makes the 55N 80x50 Double CV the correct specification for this application and not simply a preference over a cheaper single-joint shaft.

3. Teleskopik Boru Uzunluğu Telafisi
As the tractor turns or moves over uneven terrain, the effective distance between the tractor PTO stub and the discbine input shaft changes continuously. The PTO shaft tube consists of two overlapping hexagonal or star-profile steel tube sections, an inner tube and an outer tube, which slide against each other to compensate for this length variation. The overlap zone is precisely sized to maintain a minimum engagement length in the fully extended position and to prevent bottoming out in the fully compressed position. The inner face of the outer tube is typically lubricated with grease or fitted with nylon bushings to minimize friction during telescoping. Correct PTO shaft length selection is critical: if the shaft is too short it can disengage, and if too long it can bottom out and apply axial thrust loads to the tractor PTO output bearing.

4. Slip Clutch Torque Limitation and Protection
This PTO shaft with slip clutch incorporates a friction-plate torque-limiting device, typically located on the implement-side half shaft just ahead of the discbine input yoke. Under normal operating torque, the friction plates are held tightly together by calibrated spring pressure, transmitting full torque without slipping. When a sudden shock load is detected, such as a knife hitting a rock at 184 mph blade tip speed, the torque spike exceeds the slip clutch's set threshold and causes the friction plates to slip momentarily, decoupling the drive. This action absorbs the shock energy as heat rather than transmitting destructive force into the cutterbar gearbox, tractor transmission, or front axle. After the obstruction passes, the plates re-engage automatically. Proper slip clutch torque setting, verified periodically according to CMN's service guide, is essential for reliable overload protection in real-world conditions.

5. Power Delivery to the Discbine Cutterbar
The implement-side yoke, fitted with a 1.5" x 23 spline bore, connects to the input shaft of the Hesston 1340 or 1345 central gearbox. From this point, the machine's internal gear train steps up the 1000 RPM input to drive the eight disc rotor assemblies at 2,600 RPM via a series of bevel and spiral gears arranged in the sealed oil-bath cutterbar housing. A separate power path drives the conditioning rolls at a speed matched to the cutterbar output for consistent crop flow. The agricultural PTO shaft is therefore the sole source of all mechanical energy for the entire machine: the cutting, conditioning, and windrow-forming functions all depend on maintaining smooth, uninterrupted power through this single driveline component.

Uygulama Alanları

1. Hay Harvesting
The primary and most demanding use case for this disc mower PTO shaft. The Hesston 1340/1345 cutterbar running at 2,600 RPM slices through grasses and legumes at blade tip speeds approaching 184 mph, laying the crop into neat windrows. The integrated conditioning rolls crimp and crack the plant stems to accelerate field drying by disrupting the waxy cuticle layer, reducing dry-down time from 4-5 days to as little as 2 days under good drying conditions. A reliable, vibration-free PTO driveline shaft is essential to maintain consistent disc speed and conditioning roll pressure throughout an extended hay cutting day spanning many acres.

2. Forage Harvesting
Mowing high-value forage crops including alfalfa, red clover, white clover, and perennial ryegrass at the precise growth stage to maximize nutritional content for livestock feed is a precision operation that demands consistent power delivery. An unreliable or worn tractor PTO shaft can cause rpm fluctuation that affects cut quality and leaf retention, directly reducing the digestibility and protein content of the harvested forage. CMN's heavy duty PTO shaft maintains constant 1000 RPM throughput under varying crop density, giving dairy and beef producers confidence that each cut delivers maximum nutritional value whether the crop will be stored as dry hay, haylage, or green chop.

3. Silage Production
Cutting crops at higher moisture levels (65-70%) for fermented silage storage in bunkers, pits, or wrapped bales requires fast, even cutting across the entire 12-foot cutting width. Uneven cut height or intermittent power delivery caused by a failing PTO drive shaft creates inconsistent windrow density, which leads to uneven fermentation and potential spoilage in the silo or wrapped bale. The CAT 6 Double CV design of this tarımsal PTO şaftı ensures that each of the eight disc rotors spins at exactly the same speed throughout the cutting pass, resulting in a uniform windrow that ferments consistently and delivers high-quality feed energy throughout the winter feeding period.

4. Mera Yönetimi
Topping and trimming managed pastures to remove rank, stemmy, or unpalatable growth, eliminate seed heads from weeds, and stimulate fresh palatable re-growth for grazing animals is a routine use where the discbine's conditioning capability is less critical but the cutting speed and clean finish remain valuable. The slip clutch protection on this PTO shaft with slip clutch is particularly important during pasture work where concealed stones, fence stakes, and irrigation fittings may be hidden beneath the grass canopy. Without reliable overload protection, a single encounter with a buried obstruction at 184 mph blade tip speed can destroy the cutterbar gearbox assembly, making a properly functioning shear bolt PTO shaft or slip clutch an economic necessity.

5. Roadside and Specialty Mowing
Maintaining roadsides, drainage ditches, airport buffer strips, and conservation headlands where a clean, controlled cut is required in irregular or sensitive areas represents a specialty application for the Hesston discbine. In these environments the double CV PTO drive shaft for discbine is especially valuable because the machine frequently operates at wide tractor-to-implement angles while following the contour of ditches and embankments. The 80-degree maximum articulation angle of the tractor-side CV half provides the geometric freedom to cut on steep side slopes and tight corners without inducing shaft vibration or joint overload, while the outer PTO shaft guard system provides mandatory safety protection when operating near public roads and pedestrian areas.

6. Cover Crop Termination
Cutting down winter cover crops such as cereal rye, vetch, crimson clover, or oats ahead of the planting season, leaving the biomass as a protective mulch layer, is a growing practice in conservation agriculture. The discbine's high disc speed and conditioning rolls process the standing cover crop efficiently, laying it flat into a dense, even mat that suppresses early weed emergence and protects soil structure from rain impact. For this application, the operator typically disengages the conditioning rolls to avoid unnecessary power draw, placing the full torque load directly on the cutting circuit and demanding consistent RPM delivery from the 1000 PTO shaft driveline throughout the pass.

How to Install PTO Shaft on Hesston Disc Mower

1. Safety and Preparation
Before beginning installation, shut off the tractor engine completely and allow all rotating components to come to a full stop. Apply the tractor parking brake, remove the ignition key, and block the implement wheels. Verify that the new PTO shaft dimensions match your application by comparing the shaft PTO shaft length with the measured distance between the tractor PTO stub and the implement input shaft in the transport position. Confirm that the spline sizes match the tractor (1.375-21) and implement (1.5 x 23) specifications before proceeding.

2. Remove the Old Shaft
Detach the old disc mower PTO shaft by depressing the retaining collar on the tractor-end yoke and sliding it off the PTO stub shaft. Release the implement-end yoke from the discbine input shaft in the same manner. If the old shaft is seized or corroded on the splines, apply penetrating oil and allow it to soak for 20 minutes before gently tapping the yoke with a rubber mallet. Never use excessive force as this can damage the tractor PTO stub bearing or the implement input shaft seal. Dispose of the old shaft responsibly, or retain individual serviceable parts.

3. Prepare the Mating Splines
Clean the tractor PTO stub shaft and the discbine input shaft with a wire brush to remove all rust, dried grease, crop residue, and corrosion. Inspect both splines for wear, chipping, or deformation that would prevent full engagement. Apply a light coat of high-quality grease (EP2 or equivalent) to both male splines before fitting the new shaft. Proper lubrication at the spline interface is critical for preventing fretting corrosion, which is the leading cause of spline seizure and accelerated wear in tractor PTO shaft connections under vibration and cyclic torque loads.

4. Mount the New PTO Shaft
Connect the implement-side yoke of the new PTO drive shaft for discbine to the Hesston input shaft first, ensuring the locking collar clicks positively into the retention groove. Then connect the tractor-side yoke to the tractor PTO stub, again confirming a positive collar lock. With both ends connected, push the telescoping PTO shaft tube sections together and check that the overlap zone is between one-third and two-thirds of the total inner tube length in the operating position to allow for both extension and compression during field operation.

5. Secure the Safety Guard
Refit the PTO shaft guard sections from the implement end toward the tractor, ensuring each guard section overlaps the next with the retention chains and anchor brackets properly fastened to prevent the guard from rotating with the shaft. The guard must be anchored at both ends and must not contact any part of the rotating assembly. Verify that the full-length PTO shaft cover provides complete enclosure from tractor to implement with no exposed gaps. Perform a visual inspection of the guard clearance through the full steering and terrain articulation range before starting the tractor.

6. Pre-Operation Test Run
Start the tractor and engage the PTO at low engine speed (approximately 50% throttle) for the first 2-3 minutes to allow all lubrication to distribute throughout the PTO shaft u joint needle bearing assemblies and CV joint ball tracks. Listen and observe for any unusual noise, vibration, or wobble that might indicate incorrect installation, misalignment, or an inadequate guard clearance. After the initial low-speed run, gradually increase to full 1000 RPM PTO speed and confirm smooth, vibration-free operation before deploying the machine for the first full cutting pass.

Bakım İpuçları

1. Regular Greasing of CV Joints and U-Joints
The PTO shaft u joint needle bearing assemblies and CV joint ball track grooves require fresh grease at intervals specified in CMN's service manual, typically every 8-10 operating hours or at the start of each cutting season. Use high-pressure EP2 lithium grease with a grease gun through the Zerk fittings provided on each joint. Over-greasing is preferable to under-greasing in most field environments; purging slightly through the joint seals confirms the bearing cavity is fully packed. Neglecting this maintenance interval is the single most common cause of premature PTO shaft universal joint and CV joint failure in the field.

2. Lubrication of the Telescoping Tube Section
The inner and outer PTO shaft tubing sections must slide freely at all times to compensate for length changes during operation. Apply a generous coating of high-quality grease to the inner tube spline profile at the beginning of each season and mid-season under heavy use. Extend the tube fully, apply grease along the full spline length, then retract and extend several times to distribute the lubricant. Remove accumulated crop debris and dried mud from the tube overlap zone after each operating day to prevent grit contamination from acting as an abrasive and accelerating tube wear.

3. Slip Clutch Setting Verification
The slip clutch in this slip clutch PTO shaft should be inspected and its torque setting verified at the beginning of each season. Prolonged periods of inactivity can cause the friction plates to stick together from corrosion, setting the effective slip torque much higher than the rated value and negating overload protection. Conversely, worn friction discs will slip at torques below the rated value, causing nuisance slipping under normal load. CMN provides a torque verification procedure in the product documentation. Replace the friction disc set every 2-3 seasons under normal use or immediately if any visible damage is observed.

4. Guard Inspection and Replacement
Inspect the PTO shaft cover and outer guard sections before every use for cracks, missing sections, broken retention clips, or signs of the guard rubbing against the rotating assembly beneath. A guard that contacts the spinning shaft generates heat, wears through rapidly, and can become entangled in rotating components. In most jurisdictions, operating a tractor-mounted implement with a missing or damaged PTO shaft guard is a workplace safety violation with serious legal and financial consequences in addition to the immediate physical danger to the operator and any bystanders near the equipment.

5. Seasonal Storage Preparation
At the end of the cutting season, clean the entire PTO driveline shaft assembly with a pressure washer at low pressure from a safe distance, then allow to dry completely before applying a fresh coat of grease to all external metal surfaces to prevent rust formation during storage. Disconnect the shaft from both the tractor and the implement and store it horizontally in a dry location away from UV exposure, which causes plastic guard sections to become brittle. Extend the telescoping tube to the full-open position during storage to prevent the inner and outer sections from seizing together due to corrosion.

Common Troubleshooting of Disc Mower PTO Shaft

1. Çalışma Sırasında Aşırı Titreşim
Cause: Worn or seized PTO shaft u joint needle bearings; misaligned yoke phasing; collapsed inner tube bushings; or shaft operating outside its designed angle range. Solution: Grease all joints immediately. If vibration persists after greasing, disassemble each CV joint and inspect needle bearing cups for spalling or race damage. Check that both yoke forks at either end of each shaft section are in phase (aligned in the same plane). Replace the complete joint kit if any component shows measurable radial play or scoring of the bearing cup.

2. Slip Clutch Slipping Under Normal Load
Cause: Friction plates contaminated with oil or grease from a leaking PTO shaft yoke seal; worn friction disc linings reducing effective friction coefficient; spring compression set reducing clamping force. Solution: Remove and inspect all friction discs and pressure plates. Clean away contamination with brake cleaner solvent; replace any disc showing visible glazing, cracking, or thickness below the service limit. Check spring free length against specification. This shear bolt PTO shaft alternative relies entirely on friction plate condition for correct function, making periodic disc inspection mandatory on this type of clutch design.

3. Shaft Will Not Telescope (Seized Inner/Outer Tube)
Cause: Dried crop debris, soil, or rust fouling the PTO shaft tube overlap zone; lack of lubrication causing metal-to-metal contact and galvanic bonding between the inner and outer steel PTO shaft tubing sections. Solution: Apply penetrating oil along the full tube overlap length and allow it to soak for at least 30 minutes. Attempt to work the tube free with gentle rotational and axial force using padded jaw pliers. If the tube remains seized, the assembly must be replaced. After repair, maintain a strict greasing schedule to prevent recurrence. This failure mode is entirely preventable with proper seasonal maintenance.

4. Yoke Will Not Engage or Stay on Tractor PTO Stub
Cause: Worn or broken collar retention spring in the PTO shaft yoke; spline wear on either the shaft yoke bore or the tractor stub shaft allowing the yoke to disengage under torque. This is a safety-critical issue that can result in the shaft separating from the tractor at speed. Solution: Replace the retention spring and collar assembly immediately. Inspect the tractor stub splines for wear; if the tractor splines are worn, the tractor manufacturer should be consulted regarding stub shaft replacement. Do not operate with an improperly retained tractor PTO drive shaft connection under any circumstances.

5. Unusual Clunking or Knocking Sound
Cause: Worn PTO shaft universal joint or CV joint with excessive radial or axial play causing the bearing cups to clunk against the yoke bore at each revolution under load; sheared internal snap rings allowing joint components to contact the yoke bore. Solution: Stop operation immediately and inspect all joints for radial play by grasping each shaft section and attempting to rock it in all directions with the PTO disengaged. Any measurable play in a joint indicates bearing failure requiring immediate replacement of the affected PTO shaft parts kit. Continuing to operate with a failed joint will rapidly damage the yoke bore and may lead to complete shaft separation.

Disc Mower PTO Shaft and Disc Mower Gearbox

The disc mower PTO shaft, also referred to as the PTO driveline shaft for disc mower, is the mechanical link between the tractor's rear power take-off output and the disc mower's central input gearbox. It performs three critical functions simultaneously: transmitting high torque at 1000 RPM, accommodating the constantly changing angular and linear relationship between the tractor and implement, and protecting the entire driveline against shock overloads through the integrated slip clutch. Without a properly functioning agricultural PTO shaft, the disc mower gearbox receives no input power and the machine is completely inoperable regardless of the condition of its internal components. The PTO shaft for Hesston disc mower models must therefore be viewed not as a commodity consumable but as a primary drivetrain component whose specification, condition, and maintenance directly determine the reliability and productivity of the entire machine.

The disc mower gearbox, sometimes called the cutterbar input gearbox or the central gearbox, is the mechanical heart of the disc mower itself. It receives the 1000 RPM input from the PTO drive shaft, steps it up to the much higher rotational speed required by the cutting discs (2,600 RPM in the case of the Hesston 1340/1345), and distributes this power along the full width of the sealed oil-bath cutterbar to each of the eight disc rotor assemblies in sequence. The gearbox typically incorporates a set of bevel input gears, an intermediate shaft running along the length of the cutterbar, and a series of spur or bevel gears at each disc station. A separate gear train typically branches off to drive the conditioning rolls through a further speed-reduction stage to achieve the correct conditioning roll surface speed relative to the crop feed rate.

The performance of the disc mower gearbox is entirely dependent on the quality and condition of the PTO drive shaft for discbine supplying it. A worn or misaligned tractor PTO shaft that produces torsional vibration delivers a pulsating input torque to the gearbox bevel gears that causes accelerated tooth wear, bearing fatigue, and premature seal failure. This vibration-induced wear is often incorrectly diagnosed as a gearbox defect when the root cause is actually the upstream PTO shaft u joint or CV joint condition. Similarly, a slip clutch that is seized and unable to protect against shock loads will transmit every rock strike and sudden jam directly through the gearbox, leading to bent input shafts, cracked housings, and sheared internal gear keys. Conversely, a perfectly maintained gearbox filled with fresh oil but driven through a failing disc mower PTO shaft will still fail prematurely. This is why CMN Transmission recommends treating the PTO shaft for Hesston discbine and the disc mower gearbox as a matched maintenance pair: inspect both at the same service interval, replace both when significant wear is detected in either component, and always prime a freshly overhauled gearbox with a new or inspected PTO driveline shaft to avoid immediately contaminating the new gearbox with vibration-induced stress cycles from a worn driveline.

CMN Transmission supplies both PTO shaft parts and disc mower gearbox assemblies for the Hesston 1340 and 1345 platform, allowing operators and dealers to source a complete matched drivetrain solution from a single supplier with the confidence of consistent quality certification, dimensional accuracy, and technical support. Contact our agricultural sales team to discuss a combined driveline package tailored to your specific machine configuration and operating hours.

CMN Transmission'ın Tarımsal PTO Şaftlarını Neden Tercih Etmelisiniz?

CMN Transmission (Korea) stands as one of the world's leading suppliers of industrial and agricultural power transmission solutions, with a product range spanning PTO drive shafts, agricultural gearboxes, hydraulic cylinders, planetary gearboxes, worm gearboxes, bevel gears, chain sprockets, chains, gear racks, pulleys, taper bushes, couplings, and more. Headquartered in Ansan-si, Gyeonggi-do, Korea, with a production base and over 10 shareholding cooperative factories, we maintain an inventory of more than 150,000 standard stock products and serve customers in over 53 countries across North America, Europe, South America, the Middle East, Africa, Southeast Asia, and Oceania.

CMN Transmission'ı tarımsal PTO şaft pazarında farklı kılan şey, kaliteden ödün vermeden doğrudan fabrika fiyatlandırmasına olan bağlılığımızdır. Entegre bir üretim ve ticaret şirketi olarak, OEM yedek parçalarının maliyetini artıran çoklu bayi kar marjlarını ortadan kaldırıyoruz. Ürettiğimiz her traktör PTO şaftı, gelişmiş CAD tasarımı, hassas CNC işleme, modern ısıl işlem süreçleri ve titiz kalite testleri kullanılarak üretilmektedir. Ürünlerimiz hem ISO hem de CE sertifikalarına sahiptir ve uluslararası güvenlik ve performans standartlarına uygunluğu garanti eder.

Ürün kalitesinin ötesinde, büyük OEM markalarının genellikle sunamadığı bir müşteri desteği seviyesi sunuyoruz. Teknik ekibimiz, traktörünüz ve ekipman kombinasyonunuz için tam olarak uygun olan spline konfigürasyonlarını, şaft uzunluklarını ve debriyaj özelliklerini doğrulamak için satış öncesi danışmanlık hizmeti vermektedir. Standart dışı uygulamalar için özelleştirilmiş PTO şaft parçaları sunuyoruz ve talep üzerine detaylı boyut çizimleri sağlıyoruz. Satış sonrası, tek noktadan satış sonrası hizmetimiz, yedek parçalara, teknik rehberliğe ve garanti desteğine her zaman erişebilmenizi sağlar. CMN Transmission'ı seçtiğinizde, ekipmanınızın sezon boyunca verimli, güvenilir ve güvenli bir şekilde çalışmasını sağlamaya kendini adamış bir ortağı seçmiş olursunuz.

SSS

Q: What PTO shaft size does the Hesston 1340 and 1345 discbine require?
A: The Hesston 1340 and 1345 discbine uses a CAT 6 Double Constant Velocity PTO driveline shaft classified as the Weasler 55N series. The PTO shaft sizes are 1.375 inch (1-3/8 inch) with 21 splines on the tractor connection end and 1.5 inch (1-1/2 inch) with 23 splines on the implement input end. The CV joint configuration is 55N with an 80-degree articulation range on the tractor side and 50 degrees on the implement side. This double CV design is mandatory for smooth power delivery at the wide steering angles required by this drawbar-mounted machine. Any replacement agricultural PTO shaft must match these exact PTO shaft dimensions to ensure proper fit and function.

Q: Is this PTO shaft a direct replacement for the Weasler 55N series on the Hesston discbine?
A: Yes. CMN's disc mower PTO shaft is engineered specifically as a replacement of Weasler PTO shaft hardware for the Hesston 1340 and 1345 platform. All critical dimensions including spline profiles, yoke bore sizes, CV joint geometry, and overall shaft length ranges are matched to the original Weasler 55N specifications. The shaft installs on the tractor PTO stub and the discbine input shaft without any modification, adapter, or machining. The locking collar geometry, guard section profiles, and chain anchor points are also dimensionally compatible with the original Hesston installation. CMN recommends confirming your specific machine's serial number and build specification with our technical team before ordering if you have a machine with factory modifications or non-standard options.

Q: What is the difference between a 540 PTO shaft and a 1000 PTO shaft for the Hesston discbine?
A: A 540 PTO shaft operates at 540 RPM and is the traditional standard for lighter implements requiring up to approximately 65-80 horsepower. A 1000 PTO shaft operates at 1000 RPM and is the correct specification for heavier, high-power implements like the Hesston 1340 and 1345, which require 85-100+ hp to drive the 12-foot cutterbar, eight disc rotors at 2,600 RPM, and conditioning rolls simultaneously. The Hesston 1340 and 1345 are designed primarily as 1000 rpm PTO shaft machines. The stub shaft size differs: 540 RPM PTO stubs use a 1-3/8 inch 6-spline or 21-spline profile, while 1000 RPM stubs typically use the larger 1-3/4 inch 20-spline profile on some tractors - however, the Hesston's input uses the 1.5 x 23 spline interface to accommodate the required torque level regardless of the tractor stub configuration.

Q: How do I determine the correct PTO shaft length for my Hesston 1340/1345?
A: To determine the correct PTO shaft length, park the tractor and implement in a straight line on level ground and measure the distance between the tractor PTO stub shaft face and the discbine input shaft face. The ideal telescoping assembly should have approximately one-third of its total overlap remaining in the extended (straight-line) working position. This allows the shaft to compress during tight turns and to extend when the hitch reaches its maximum separation. CMN's technical team can advise on the correct collapsed and extended length range for your specific tractor-to-implement configuration based on the measured gap, your tractor model, and the Hesston hitch geometry. Never operate a shaft that is at the end of its telescoping travel in either direction, as this can cause bottoming or separation failure.

Q: Can I order just the tractor-side or implement-side CV half shaft instead of the complete assembly?
A: Yes, CMN Transmission stocks all individual PTO shaft parts as separate line items. If your inspection reveals that only one end of the shaft is worn or damaged, you can order specifically the 55N 80-degree CV half for the tractor side (1.375-21 spline) or the 55N 50-degree CV half for the implement side (1.5 x 23 spline) and mate it with your existing serviceable half. This modular approach is one of CMN's key advantages over suppliers who only offer complete assemblies. Contact our technical team with your existing assembly condition and we will advise which half requires replacement and confirm the correct PTO shaft adapter interface to ensure both halves are compatible at the central coupling point.

Q: How does the slip clutch PTO shaft protect my Hesston discbine and tractor?
A: The slip clutch PTO shaft contains a stack of friction discs maintained under spring pressure between a drive plate connected to the tractor side and a driven plate connected to the implement side. Under normal operation, friction keeps both plates locked together, transmitting full torque. When the cutterbar hits an obstruction that causes a torque spike above the clutch's set limit, the friction plates slip against each other, absorbing the shock as heat and preventing that destructive impulse from reaching the discbine's input gearbox or the tractor's transmission. This mechanism is significantly more effective than a shear pin PTO shaft or PTO shaft shear bolt system for disc mower applications because it re-engages automatically without requiring the operator to stop, exit the cab, and replace a shear pin before resuming mowing, saving significant downtime during a time-critical hay harvest window.

Q: Why does the Hesston discbine require a Double CV PTO shaft rather than a standard cardan shaft?
A: The Hesston 1340 and 1345 use a drawbar swivel hitch with hydraulic tongue swing that allows the machine to be steered to wide angles relative to the tractor during headland turns and contour mowing. A standard cardan (universal joint) PTO drive shaft produces significant rotational velocity fluctuation when operated at angles above approximately 8-10 degrees: the output shaft accelerates and decelerates twice per revolution at the same frequency as the input speed. At 1000 RPM and the wide angles inherent to discbine operation, this velocity fluctuation creates severe torsional vibration in the cutterbar gearbox. The Double CV design cancels this fluctuation mathematically, delivering a perfectly smooth 1000 RPM output at all operating angles up to the rated limits of each CV joint, which is the fundamental reason the Hesston OEM specification requires this shaft type rather than a simpler and cheaper cardan design.

Q: How often should I replace the PTO shaft universal joint kits on the Hesston discbine driveline?
A: Under normal operating conditions and with regular greasing at 8-10 hour intervals, the PTO shaft universal joint and CV joint assemblies in this driveline should last between 600 and 1,000 operating hours before replacement is necessary. However, joint condition varies enormously depending on operating angle, lubrication discipline, and whether any shock events have occurred. At the start of every season, check each joint for radial play by gripping either side and attempting to rock it - any detectable play indicates bearing wear and the joint should be replaced before the season begins. Replacement PTO shaft u joint kits are available individually from CMN, allowing targeted replacement of worn joints without purchasing an entire new custom PTO shaft assembly.

Q: Does CMN offer custom PTO shaft configurations for non-standard Hesston or other discbine models?
A: Yes. CMN Transmission offers custom PTO shaft manufacturing for non-standard configurations including modified shaft lengths, alternative spline profiles, different torque ratings, and OEM-branded assemblies for agricultural equipment manufacturers. Our engineering team works from customer-supplied dimensional drawings or physical samples to produce custom PTO shaft dimensions and configurations that are not available as standard catalog items. This service is particularly useful for operators with modified tractor-implement combinations, for dealers who require private-label tractor PTO shafts, and for implement manufacturers who need a competitively priced OEM supply chain for their own equipment lines. Contact CMN's agricultural sales team with your specification requirements for a custom quote and typical production lead time.

Q: What is the minimum tractor horsepower required to run the Hesston 1340/1345 with this PTO shaft?
A: The Hesston 1340 and 1345 require a minimum of approximately 85 hp (63 kW) at the PTO, with 100+ hp recommended for optimal performance in heavy or wet crops. The tractor PTO drive shaft itself imposes no additional power demand beyond the implement requirements, but selecting the correct tractor power level is important for keeping the 1000 rpm PTO shaft running at its rated speed under the full cutting load of 8 discs at 2,600 RPM plus the conditioning rolls. Underpowered tractors will cause the PTO to drop below 1000 RPM in heavy crop, reducing cut quality, increasing power consumption, and placing higher torque stress on the driveline components. The drawbar capacity and hydraulic output of the tractor must also be sufficient to support the machine's 5,300-6,500 lb operating weight and hydraulic tongue swing requirements.

Müşteri Yorumları

Marcus Hollingsworth, Çiftlik Müdürü, Amerika Birleşik Devletleri
"We run a 1345 discbine on about 800 acres of alfalfa every year. The original Weasler shaft finally gave out after six seasons and I needed something fast - couldn't wait three weeks for the dealer to get parts in. Found CMN online, ordered the 55N 80x50 Double CV replacement, and it shipped from Korea within two days. Arrived in perfect condition, slid straight onto the 1.375-21 spline without any fuss, and we were cutting the same week again. That was two full seasons ago now, and it's still running perfectly. Honestly, better quality than I expected for the price."

Johann Kiesewetter, Farmer, Germany
"I ordered the PTO drive shaft kit for our Hesston 1340 and am very satisfied. CMN’s technical support confirmed the exact dimensions by email before the purchase—this was important because I was unsure whether the PTO shaft length would fit. The shaft arrived in the correct length, all splines were perfect, and the quality of the CV joints is clearly better than the cheap replacement part I had previously purchased from a local dealer. It has now been running smoothly and without vibrations for 200 operating hours. I highly recommend it."

Tyler Beaumont, Farm Owner, Canada
"Running a mixed hay and silage operation in Ontario, we go hard on equipment from May through September. Our Hesston discbine PTO shaft broke during the first cut this spring - snapped a CV joint yoke right at the weld. I needed a replacement fast. CMN had the complete 55N Double CV assembly in stock, shipped it DHL, and I had it in hand within 5 business days. The build quality is excellent. The guard sections fit together properly without gaps, the slip clutch adjuster is accessible, and the tube telescopes smoothly. We've put over 300 hours on it since May without a single issue. Price was about 35% less than the dealer quoted for a Weasler replacement."

Hamish Sutherland, Agricultural Contractor, New Zealand
"Down here in Canterbury we run a 1345 for contract mowing ryegrass and clover. The terrain is mostly flat but we cover a lot of ground - probably 2,000 hectares a season. I was skeptical about ordering a PTO shaft parts kit from Korea but a mate who uses CMN for gearboxes convinced me to give it a go. Ordered the implement-side 50-degree CV half to replace just the worn end, saved quite a bit over buying a whole new shaft. The 1.5 x 23 spline fit was spot on, no wobble whatsoever. CMN sent dimensional drawings before I ordered to confirm the fit - that kind of technical support is rare and really appreciated. Solid company."

Bertrand Fontaine, Farm Operator, France
"Our farm produces alfalfa hay in Beauce and we have a Hesston 1340 that we have been using for several years. The original power take-off shaft failed after four seasons and we ordered the replacement from CMN Transmission. Delivery took approximately one week to France, the packaging was solid, and the dimensions correspond exactly to the machine’s specifications. What really impressed me is the quality of the constant velocity joints—they are visibly better finished than the original part. No vibrations since installation. I recommend CMN to any farmer seeking a serious alternative to the excessively high prices of original parts."

Brett Mackenzie, Workshop Manager, Australia
"I manage a small agricultural machinery dealership and workshop in Queensland and I've started stocking CMN PTO shaft kits as an alternative to OEM parts for our customers with Hesston discbines. The quality is genuinely very good - on par with what we'd get from official channels at significantly better pricing. We've fitted probably eight of these shafts over the past year and a half and haven't had a single warranty return. One customer specifically commented that the guard cover on the CMN shaft was actually better fitting than his original. Lead times on special orders are also very reasonable. I'll continue to recommend these to my customers."

Robert Clarkson, Agricultural Contractor, United Kingdom
"We use a Hesston 1345 for contracting across the Yorkshire Dales and the shaft takes a real beating with the terrain we work on - plenty of tight headland turns and sloping ground. The slip clutch protection on the CMN shaft has already saved us at least twice from what could have been serious cutterbar damage when we clipped buried stones. It slipped cleanly and re-engaged without fuss both times. The 80-degree CV angle on the tractor side handles our steepest slopes without any vibration. Very happy with the product. Customer service answered my pre-sale questions about shaft length and spline compatibility within a few hours which made me confident to place the order."

Pieter Berg, Dairy Farmer, Netherlands
"We mow clover and grass on approximately 500 hectares per year in the Gelderse Vallei. The original Weasler drive shaft failed after four seasons at the sliding coupling. CMN delivered the replacement quickly—within one week in the Netherlands. Installation was straightforward, the 1.375-21 splines fitted directly, and the drive shaft has now been running smoothly for one and a half seasons without any vibration or noise. The price is very competitive compared to what we are accustomed to from the dealer. What I also appreciate is that the half shafts can be ordered separately if parts wear out—this represents significant savings in the long term."

Carlos Ferreira, Agricultural Service Provider, Brazil
"I provide agricultural contracting services for grass cutting and silage in the interior of Minas Gerais, and we have a Hesston 1340 that we use during the harvest season. The original part was exhibiting excessive vibration, so we ordered the complete CAT 6 Double CV cardan shaft from CMN. The product arrived well packaged, the material quality is visibly superior to what I expected from an Asian supplier, and the coupling to the tractor’s power take-off was perfect on the 1.375-21 spline. We have accumulated approximately 400 hours of heavy cutting of Napier grass and Brachiaria without any problems. CMN’s pre-sale service was very attentive and responded quickly to all my technical questions by email."