\u0639\u0645\u0648\u062f \u0646\u0642\u0644 \u0627\u0644\u062d\u0631\u0643\u0629 \u0644\u0644\u062c\u0631\u0627\u0631<\/strong><\/a> is a CAT 6 Constant Velocity driveline that connects the tractor PTO stub to the primary input of the discbine tongue gearbox. The CV joint design inside this shaft is fundamental to the discbine’s operating envelope. Unlike a conventional cardan joint, which produces an inherent twice-per-revolution speed fluctuation when operated at an angle, the CV joint maintains exactly uniform angular velocity throughout its entire rotation regardless of the deflection angle between input and output. This eliminates the pulsing torque loads, vibration, and noise that a standard shaft would create when the discbine is swung to one side during side-pull or center-pivot operation.<\/p>\nAfter the main PTO drive shaft delivers power to the tongue gearbox, the gearbox splits and redirects the rotational force toward the cutterbar drive train. On swivel-hitch models such as the H7230, H7330, H7460, and H7560, a dedicated swivel gearbox is integrated into the tongue assembly to maintain the PTO shaft angle straight through turns of more than 90 degrees. This gearbox is critical because it allows the operator to execute extremely tight headland turns and cut around field obstacles without ever needing to stop and realign the machine. Power exits the tongue gearbox via an intermediate PTO driveline shaft and enters the main cutterbar drive gearbox on the frame of the implement.<\/p>\n
For the H7230, H7330, H7460, and H7560 models, one or more intermediate PTO shaft assemblies bridge the tongue gearbox to the cutterbar gearbox, often including a 55N square-profile shaft with an integrated clutch for the larger 100 HP models. The secondary disc mower PTO shaft then distributes power laterally through the MowMax cutterbar system, driving the series of individual sealed disc gearboxes mounted along the cutterbar frame. Each disc gearbox multiplies the input shaft RPM to drive the cutting discs at approximately 3,000 RPM, generating the high blade tip speed necessary for a clean, high-quality cut through dense forage crops. For the secondary shaft position on most Discbine models, CMN Transmission recommends a Category 5 Double CV configuration with the FNT34 combination clutch, ensuring smooth power delivery to the cutterbar and reliable overload protection for the gearbox chain.<\/p>\n
The FNT34 clutch assembly on the secondary slip clutch PTO shaft performs two separate but complementary protection functions simultaneously. The friction disc element provides a calibrated torque slip threshold: when the cutterbar encounters a sudden blockage, rock strike, or foreign object impact that produces a torque spike exceeding the clutch’s set limit, the friction pads slip instantaneously to absorb the shock energy before it can propagate through the PTO shaft u joint, yoke, and gearbox internals. This is the mechanism that saves the most expensive components from catastrophic failure.<\/p>\n
![\"PTO](\"https:\/\/korea-transmission.com\/wp-content\/uploads\/2026\/04\/PTO-Shaft-for-New-Holland-Disc-Mower-24.webp\")
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Applications of Disc Mower PTO Shaft<\/h2>\n
1. Hay Harvesting<\/strong>
\nThe primary application for the New Holland Discbine series. The disc mower cuts grasses and legumes into windrows while the integrated conditioning rolls crimp and crack the stems to accelerate field drying before baling. A reliable PTO shaft for discbine is the critical link that transfers tractor power to the cutterbar at the consistent RPM required for a clean, high-quality cut across varied crop densities and field conditions. Any interruption in PTO shaft performance during the narrow harvest weather window directly reduces hay quality and profitability.<\/p>\n2. Forage Harvesting<\/strong>
\nMowing high-value crops such as alfalfa, clover, and ryegrass at the right stage of maturity requires the cutterbar to run at precise, consistent speed throughout the entire swath. The 1000 PTO shaft configuration used on the larger Discbine models delivers the RPM stability needed to maximize nutritional content and minimize leaf loss at the point of cutting, whether the crop is destined for dry hay storage or green chop for direct feeding. An accurately calibrated slip clutch on the PTO drive shafts assembly protects the gearbox investment without compromising cut quality.<\/p>\n3. Silage Production<\/strong>
\nCutting crops at higher moisture levels for fermented silage storage in bunkers, pits, or wrapped bales demands fast, even cutting across the full width of the machine to ensure uniform fermentation. The 540 PTO shaft and 1000 rpm PTO shaft options across the Discbine range allow operators to match PTO speed to tractor output and silage crop type. Reliable PTO shaft parts are especially critical in silage operations because any shaft failure mid-cut results in uneven moisture in the wilted crop, which compromises fermentation quality and silage dry matter losses.<\/p>\n4. \u0625\u062f\u0627\u0631\u0629 \u0627\u0644\u0645\u0631\u0627\u0639\u064a<\/strong>
\nTopping and trimming pastures to control rank or stemmy growth, remove weeds, and encourage fresh and palatable re-growth for grazing animals places heavy intermittent demands on the discbine drivetrain. The combination of dense root crowns, embedded wire, stones, and sudden terrain changes makes the overrunning clutch function of the FNT34 shear bolt PTO shaft alternative especially valuable in pasture environments. A robust PTO shaft tractor interface with proper CV joint articulation ensures the machine tracks ground contours without generating destructive torque spikes during the frequent direction changes typical of irregular paddock shapes.<\/p>\n5. Cover Crop Termination<\/strong>
\nCutting down winter cover crops such as cereal rye or vetch ahead of the planting season, leaving the biomass as a protective mulch layer to suppress weeds and protect soil structure. Cover crop termination often involves mowing at high forward speeds through dense, lodged crop stands that test the torque capacity of every component in the PTO driveline shaft system. Choosing the correct PTO shaft sizes and category rating for the tractor HP being used avoids overloading the drivetrain and ensures that the cut biomass is distributed uniformly across the full cutting width for effective mulch coverage.<\/p>\n6. Roadside & Specialty Mowing<\/strong>
\nMaintaining roadsides, drainage ditches, airport buffer strips, and conservation headlands where a clean, controlled cut is needed in irregular or sensitive areas. In these applications, the center-pivot and swivel-hitch Discbine models depend entirely on the CAT 6 CV tractor PTO shafts to maintain smooth power delivery through the extreme articulation angles needed to position the cutterbar precisely along sloped banks, ditches, and corners. The PTO shaft guard and enclosed drivetrain design are also especially important in public roadside work where bystander safety standards apply.<\/p>\n![\"PTO](\"https:\/\/korea-transmission.com\/wp-content\/uploads\/2026\/04\/PTO-Shaft-for-New-Holland-Disc-Mower-21.webp\")
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How to Install PTO Shaft on New Holland Discbine<\/h2>\n
1. Safety Preparation: Disengage PTO and Chock Wheels
\nBefore beginning any PTO shaft installation or removal procedure, shut off the tractor engine completely and allow all rotating components to come to a full stop. Apply the tractor parking brake firmly and chock the rear wheels to prevent any movement. Disconnect the spark plug lead on older tractors or turn the key fully to the off position on modern models. Never attempt to install or remove a PTO driveline shaft while any components are still turning, even at very low speed. Confirm that no residual hydraulic pressure remains in the discbine lift circuit that could cause the header to drop unexpectedly during the procedure.<\/p>\n
2. Measure and Confirm PTO Shaft Length Before Fitting
\nBefore sliding the new PTO shaft tube onto the tractor and implement stubs, measure the distance between the two yoke connection points with the discbine hitched to the tractor at normal operating height. The shaft should overlap by at least 1\/3 of its telescoping travel when fully compressed, and the two yoke halves should not contact each other or hit the shaft tube ends when the machine is at full articulation angle. A PTO shaft length that is too short risks disengaging the telescoping tubes under extreme articulation, while an excessively long shaft risks bottoming out and bending or cracking the PTO shaft tubing when the machine moves over ground undulations.<\/p>\n
3. Slide and Lock the Tractor-Side Yoke onto the PTO Stub
\nAlign the PTO shaft yoke spline with the tractor PTO output stub, ensuring that the correct spline profile is matched (1.375-21 or 1.750-20 as applicable to your Discbine model). Push the yoke firmly onto the stub until the spring-loaded locking collar clicks into the groove and the yoke is fully seated with no axial play. Tug the yoke firmly to confirm it is locked. Never start the tractor with an unlocked yoke. On models where a PTO shaft adapter is used to bridge a difference between tractor and implement spline sizes, confirm the adapter is correctly torqued to specification before fitting the main driveline shaft.<\/p>\n
4. Connect the Implement-Side Yoke to the Discbine Input
\nConnect the implement-side yoke to the discbine tongue gearbox input shaft using the same locking collar procedure used on the tractor side. On Discbine models using a combination clutch, ensure the clutch body faces the correct direction as marked on the FNT34 housing (the overrunning clutch must be oriented toward the implement side, not the tractor side). Check that the PTO shaft cover chain anchor points are correctly attached to both the tractor drawbar bracket and the implement frame to prevent the guard tube from rotating with the shaft. A loose or unanchored PTO shaft guard is a serious safety hazard and may cause the guard to wrap around the shaft during operation.<\/p>\n
5. Lubrication, Trial Run, and Final Checks
\nApply lithium-complex grease to all PTO shaft u joint cross-kit grease nipples until fresh grease appears at the needle roller bearing seals on all four trunnion ends. Also grease the telescoping inner and outer shaft profile tubes to prevent fretting corrosion and ensure smooth length adjustment under load. Start the tractor and engage the PTO at low throttle first, listening and observing for any unusual vibration, noise, or misalignment before bringing the machine up to full working RPM. After the first hour of operation, re-torque any visible bolt connections on the clutch and yoke assemblies, and re-check the guard chain anchor points for security. This initial inspection interval is standard practice after fitting any new agricultural PTO shaft assembly.<\/p>\n
![\"PTO](\"https:\/\/korea-transmission.com\/wp-content\/uploads\/2026\/04\/PTO-Shaft-for-New-Holland-Disc-Mower-26.webp\")
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How to Choose the Right PTO Shaft for Disc Mower<\/h2>\n
1. Confirm Your Exact Discbine Model Number<\/strong>
\nThe model number (H7220, H7230, H7320, H7330, H7450, H7460, H7550, or H7560) determines not only the PTO shaft category and PTO shaft dimensions required, but also whether your machine uses one, two, or three shaft positions in the drivetrain. The shaft requirements for a 65 HP H7220 are fundamentally different from those of a 100 HP H7460, and ordering the wrong category will result in a shaft that either does not physically fit or is under-rated for the torque load it must transmit. Always locate the model plate on the tongue frame before placing an order, and note the production year if possible for variant identification.<\/p>\n2. Identify Your Tractor PTO Speed: 540 or 1000 RPM<\/strong>
\nThe H7220 and H7320 are 540 RPM only, requiring a standard 540 PTO shaft configuration. The H7450, H7460, H7550, and H7560 require a 1000 PTO shaft. The H7230 and H7330 can run on either 540 or 1000 RPM, so the shaft must be selected to match the tractor PTO output speed in actual field use. Running a discbine on the wrong PTO speed will either dramatically overspeed the cutterbar discs (creating a dangerous blade failure risk at 1000 RPM on a 540-designed machine) or underspeed them (producing a poor quality cut with excessive crop plugging). Verify the tractor PTO speed selector position before finalizing the shaft specification.<\/p>\n3. Verify Tractor Spline Size and Hitch Height<\/strong>
\nThe CAT 6 CV main shaft is available with either a 1.375-21 spline (6-spline, common on 65-80 HP tractors) or a 1.750-20 spline (21-spline, used on 90-100+ HP tractors). Measure the PTO stub diameter precisely if you are unsure, or refer to the tractor operator manual for the specified PTO output shaft profile. Additionally, the distance between the tractor drawbar pin and the tractor PTO centerline affects the effective shaft angle at working height. If this distance is non-standard due to a modified hitch bracket or an unusual tractor-implement combination, our engineering team can calculate the correct PTO shaft length and provide a custom configuration to suit the exact geometry.<\/p>\n4. Choose Clutch Type Based on Operating Conditions<\/strong>
\nFor most Discbine applications, the FNT34 combination clutch on the secondary slip clutch PTO shaft position is the preferred choice, offering both friction slip protection and overrunning capability in one compact assembly. However, in some very rocky or obstructed fields where extreme impact loads are frequent, a shear bolt PTO shaft or PTO shaft shear bolt design may be preferred because the shear bolt provides an absolutely definite, positive torque limit and is quickly replaceable in the field with a standard hardware item. Our CMN Transmission technical team can advise on the appropriate clutch selection for your specific field conditions, crop type, and typical obstacle frequency to ensure the right level of drivetrain protection is specified from the start.<\/p>\n![\"PTO](\"https:\/\/korea-transmission.com\/wp-content\/uploads\/2026\/04\/PTO-Shaft-for-New-Holland-Disc-Mower-20.webp\")
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Common PTO Driveline Shaft Troubleshooting<\/h2>\n
1. \u0627\u0647\u062a\u0632\u0627\u0632 \u0645\u0641\u0631\u0637 \u0623\u062b\u0646\u0627\u0621 \u0627\u0644\u062a\u0634\u063a\u064a\u0644
\nVibration in the PTO drive shaft during mowing is most commonly caused by worn or damaged PTO shaft universal joint cross-kits, a bent or kinked PTO shaft tube, misaligned yoke phasing (the two yokes must be in the same plane, not 90 degrees offset), or a shaft running at an excessive operating angle for its category rating. Inspect the cross-kit needle rollers for wear or seizure by checking for any play or rough rotation at each trunnion journal. Replace the cross-kit assembly immediately if any roughness or looseness is felt, as a failed U-joint can disintegrate under load and cause significant secondary damage to the machine and a serious safety hazard for the operator.<\/p>\n
2. Clutch Slipping Under Normal Load
\nIf the FNT34 friction clutch on the slip clutch PTO shaft is slipping during normal field operation without any apparent overload event, the most likely causes are worn friction disc linings, contamination of the friction surfaces with grease or oil, or incorrect spring preload after a previous service. Do not attempt to increase the clutch spring preload beyond the manufacturer’s specification as a temporary fix, as this will defeat the overload protection function and risk damaging the gearbox in the next rock strike event. Instead, disassemble the clutch, inspect the friction disc condition, clean all mating surfaces thoroughly, replace any worn components, and re-set the spring preload to the specified torque value before returning the PTO shaft parts to service.<\/p>\n
3. Telescoping Tube Seizing or Difficult to Extend
\nIf the inner and outer PTO shaft tubing profiles are binding or seizing when the machine is hitched at an angle, the root cause is almost always lack of lubrication on the sliding profile surfaces, combined with the abrasive fretting wear that accumulates when the tubes are operated dry for extended periods. Clean the inner and outer profile sections with a clean rag, apply a generous coat of lithium-based grease, and cycle the shaft through its full extension range several times to distribute the grease evenly. For severely corroded profiles, a light application of penetrating oil followed by careful clean-up and fresh grease may be needed. Regularly greasing the PTO shaft tube sliding interface at the same service interval as the cross-kits prevents this issue from recurring.<\/p>\n
4. Noisy Operation or Clicking from PTO Shaft Area
\nClicking, knocking, or rhythmic noise from the tractor PTO shaft area during operation typically indicates a failing cross-kit needle roller bearing, loose or damaged PTO shaft yoke locking collar, or a worn overrunning ratchet mechanism inside the FNT34 combination clutch. Locate the source of the noise carefully by running the discbine at low speed on flat ground with the cutterbar raised, observing the shaft from a safe distance while listening for the click cycle frequency. A click that repeats at shaft rotation frequency (once per revolution) usually indicates a cross-kit problem, while a click that occurs irregularly often points to the overrunning clutch ratchet engagement. Address the noise source promptly as continued operation with a damaged component accelerates wear dramatically and increases the risk of sudden shaft failure.<\/p>\n
5. PTO Shaft Guard Damage or Breakage
\nA cracked, missing, or non-rotating PTO shaft cover is both a safety compliance failure and a maintenance indicator. The guard should rotate freely on its bearing relative to the inner shaft, and the chain anchor must be securely attached at both ends. A guard that has seized onto the shaft and is rotating with it generates significant friction heat and will wear through the plastic rapidly. Always replace a damaged PTO shaft guard immediately and never operate the discbine with an exposed rotating shaft, as the entanglement risk to operators is severe. Our replacement guard kits are designed to match the exact diameter and length of our CMN agricultural PTO shaft assemblies and include all anchor chains, end caps, and fitting hardware.<\/p>\n
![\"PTO](\"https:\/\/korea-transmission.com\/wp-content\/uploads\/2026\/04\/PTO-Shaft-for-New-Holland-Disc-Mower-28.webp\")
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Disc Mower PTO Shaft and Disc Mower Gearbox<\/h2>\n
The disc mower PTO shaft is the primary mechanical link between the tractor and the entire disc mower drivetrain. It is responsible for transferring engine torque from the spinning PTO output stub, through the working length of the hitch connection, and into the input gearbox of the disc mower or discbine implement. On the New Holland Discbine series, this shaft must accommodate the unique geometric demands of a machine that can pivot, swivel, and articulate at steep angles during operation and field headland turns, which is why the CAT 6 Constant Velocity design is specified for the main shaft position. The PTO drive shaft for discbine also incorporates safety protection in the form of the FNT34 combination clutch, which shields both the tractor and implement drivetrain from shock loads and overrunning inertia forces. Without a properly functioning tractor PTO drive shaft, no power reaches any part of the disc mower cutting or conditioning system, making it the single most critical mechanical component in the entire implement powertrain from the perspective of operational availability.<\/p>\n
CMN Transmission manufactures and supplies the complete PTO shaft for disc mower range to match every configuration in the Discbine lineup, from the compact 540 RPM side-pull models to the high-output 1000 RPM center-pivot wide-cut machines. Each shaft assembly is designed and tested to deliver the rated HP and torque capacity of the implement without vibration, noise, or premature wear throughout its full service life.<\/p>\n
The disc mower gearbox, also known as the cutterbar gearbox or disc drive gearbox, is the power distribution hub that receives the input torque from the PTO shaft driveline and converts it into the high-speed rotational output needed to drive the individual cutting discs. On the New Holland Discbine MowMax cutterbar system, each cutting disc is driven through its own individually sealed gearbox module with a dedicated oil reservoir, which means there is a series of gearboxes linked in sequence along the cutterbar. Each gearbox module multiplies the input shaft speed from the 540 or 1000 RPM PTO input up to the cutterbar disc operating speed of approximately 3,000 RPM, which is the speed required for clean, high-velocity blade-tip cutting through dense forage crops. The cutterbar gearboxes are connected in series by short lateral shaft segments, creating a continuous mechanical power chain from the primary input at one end of the cutterbar to the final disc gearbox at the opposite end.<\/p>\n
The essential interdependence between the PTO driveline shaft for disc mower and the disc mower gearbox is direct and absolute: the gearbox cannot function without the PTO shaft delivering input power, and the PTO shaft serves no purpose if the gearbox fails to receive and distribute that power correctly. In practice, the two components must be correctly matched in torque capacity and rotational speed to ensure that neither is overloaded relative to the other. When replacing either component, it is best practice to inspect both simultaneously: a worn or failed gearbox is often the root cause of abnormal torque spikes that have already accelerated PTO shaft wear, and vice versa.<\/p>\n
![\"Disc](\"https:\/\/korea-transmission.com\/wp-content\/uploads\/2026\/04\/0_Disc-Mower-Gearbox-1.webp\")
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Why Choose CMN Transmission’s Agricultural PTO Shafts?<\/h2>\n
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.<\/p>\n
What sets CMN Transmission apart in the agricultural PTO shaft market is our commitment to factory-direct pricing without sacrificing quality. As an integrated manufacturing and trading company, we eliminate the multiple dealer markups that inflate the cost of OEM replacement parts. Every tractor PTO shaft we produce is manufactured using advanced CAD design, precision CNC machining, modern heat treatment processes, and rigorous quality testing. Our products carry both ISO 9001 and CE certifications, ensuring compliance with international safety and performance standards.<\/p>\n
Beyond product quality, we offer a level of customer support that large OEM brands often cannot match. Our technical team provides pre-sale consultation to confirm spline configurations, PTO shaft dimensions, and clutch specifications for your exact tractor and implement combination. We offer custom PTO shaft manufacturing for non-standard applications and provide detailed dimensional drawings upon request. Our PTO shaft parts catalog covers the full range from compact 540 PTO shaft configurations to high-output 1000 rpm PTO shaft assemblies, with shear pin PTO shaft, slip clutch PTO shaft, and combination clutch variants all available from stock.<\/p>\n
After the sale, our one-stop after-sales service ensures that replacement components, technical guidance, and warranty support are always accessible. When you choose CMN Transmission, you are choosing a partner committed to keeping your equipment running efficiently, reliably, and safely, season after season. Contact us today for pricing, technical specifications, and delivery information on the PTO shaft for New Holland Discbine models that match your operation.<\/p>\n
![\"\u0645\u0639\u062f\u0627\u062a](\"https:\/\/korea-transmission.com\/wp-content\/uploads\/2026\/03\/Factory-Equipment-3.webp\")
![\"\u0645\u0639\u062f\u0627\u062a](\"https:\/\/korea-transmission.com\/wp-content\/uploads\/2026\/03\/Factory-Equipment-1.webp\")
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\u0627\u0644\u062a\u0639\u0644\u064a\u0645\u0627\u062a<\/h2>\n
Q: What PTO shaft configuration does the New Holland Discbine H7450 require?<\/strong>
\nA: The H7450 is a 1000 RPM center-pivot model requiring 90 PTO horsepower. It uses a 55N Double 80\/50 CV primary main shaft for standard configurations, or a 55N standard shaft when used with the optional swivel hitch tongue. The secondary shaft position uses a 55N standard configuration. There is no intermediate shaft on the H7450. The implement input shaft is typically a 1.375-21 spline. When ordering, confirm whether your machine has the standard drawbar hitch or the optional swivel hitch, as this determines the primary shaft specification. Our technical team can confirm the exact part numbers based on your serial number if needed.<\/p>\nQ: What is the difference between a 540 PTO shaft and a 1000 RPM PTO shaft for disc mowers?<\/strong>
\nA: A 540 PTO shaft is designed for tractors with a 540 RPM PTO output, typically used with implements requiring up to around 65-80 PTO horsepower, such as the H7220, H7230, H7320, and H7330 Discbine models. A 1000 PTO shaft operates at 1000 RPM and handles higher power densities in the same shaft diameter, making it the standard for high-output implements requiring 90-100 HP or more, as used on the H7450 through H7560 series. The spline count and shaft profile differ between 540 and 1000 RPM specifications, so these shafts are not interchangeable. Running a 540-designed shaft at 1000 RPM will cause catastrophic failure due to excessive centrifugal forces on the cross-kits and tubing. Always match the shaft specification to the tractor PTO speed setting in actual use.<\/p>\nQ: Can I use a CMN Transmission shaft as a direct replacement for Weasler PTO shaft on my Discbine?<\/strong>
\nA: Yes. CMN Transmission manufactures our PTO shaft for New Holland Discbine as a direct dimensional equivalent to the Weasler OEM shafts originally installed on the H-series Discbine models. All yoke spline profiles, bore diameters, cross-kit socket dimensions, and telescoping tube lengths are manufactured to the same reference dimensions as the original Weasler drivelines. This means our shafts bolt directly into the existing bracket mounts and locking collar interfaces on your machine without any adaptation or modification required. The same direct-fit principle applies to Bondioli and Pavesi original shafts as well. If you have any uncertainty about the correct specification for your machine’s production year, contact our technical team with your serial number for confirmation before ordering.<\/p>\nQ: What is an FNT34 combination clutch and why is it important on the discbine PTO shaft?<\/strong>
\nA: The FNT34 is a specific type of combination clutch that integrates both a friction disc clutch and an overrunning (freewheeling) ratchet clutch in a single compact housing, mounted on the secondary PTO drive shaft for discbine. The friction element limits the peak torque that can be transmitted through the shaft to a calibrated maximum, protecting the cutterbar gearboxes and U-joints from sudden overload impacts caused by rock strikes or foreign object hits. The overrunning element prevents the high rotational inertia stored in the spinning disc cutterbar from back-driving the tractor transmission when the PTO is disengaged or the engine is suddenly unloaded. Both protection mechanisms are critical for reliable, cost-effective operation of the New Holland Discbine, and the FNT34 assembly should be inspected and serviced at the intervals specified in the implement operator manual to maintain correct slip torque calibration.<\/p>\nQ: What spline size does the New Holland Discbine tractor-side PTO stub use?<\/strong>
\nA: The New Holland Discbine range accommodates two common tractor PTO spline sizes: the 1.375-inch diameter 21-spline (also written as 1-3\/8 inch x 21 spline or 1.375-21), which is standard on most tractors in the 65-80 HP class used with H7220, H7230, H7320, and H7330 models; and the 1.750-inch diameter 20-spline (also written as 1-3\/4 inch x 20 spline or 1.750-20), which is used on larger tractors in the 90-100 HP class running the H7450 through H7560. The implement input shaft is most commonly a 1.375-21 spline across all models. If your tractor has an unusual PTO shaft adapter requirement between these standard sizes, CMN Transmission can supply the appropriate adapter coupling as part of the shaft assembly order.<\/p>\nQ: What is a CAT 6 Constant Velocity PTO shaft and why does the Discbine need it?<\/strong>
\nA: Category 6 (CAT 6) refers to the torque and size class of the heavy duty PTO shaft, capable of transmitting up to approximately 3,000 Nm of torque in the primary shaft position. The Constant Velocity (CV) joint design within this shaft uses a double-joint assembly that maintains identical input and output angular velocity regardless of the deflection angle, which is fundamentally different from standard single Cardan joint designs that produce cyclical speed variation at any working angle. The Discbine requires CV technology on the main shaft because the center-pivot and swivel-hitch tongue designs allowthe machine to articulate far beyond the operating angle range of a standard single Cardan shaft. Without a CV joint, running a discbine at extreme tongue angles would generate severe vibration, rapid U-joint wear, and unacceptable noise levels at both 540 and 1000 RPM operating speeds.<\/p>\nQ: How do I know when my disc mower PTO shaft needs to be replaced?<\/strong>
\nA: The key signs that your PTO shaft for disc mower requires replacement or major service include: noticeable vibration or shaking in the machine at normal operating RPM; clicking, knocking, or grinding noise from the shaft area; visible radial play or roughness in the PTO shaft u joint cross-kit when rotated by hand; visible cracking, bending, or denting in the PTO shaft tubing; a slip clutch that no longer holds under normal cutting load (indicating worn friction disc linings); difficulty telescoping the inner and outer shaft profiles; or a seized, cracked, or non-rotating PTO shaft guard. Annual inspection at the start of the cutting season and after any known impact events is recommended. Replacing worn components proactively during the off-season is far less costly than an emergency breakdown mid-harvest.<\/p>\nQ: Can CMN Transmission manufacture custom PTO shaft lengths for non-standard installations?<\/strong>
\nA: Yes. CMN Transmission offers a full custom PTO shaft manufacturing service for applications where standard catalog lengths do not fit the tractor-implement geometry, for modified machines with altered hitch heights, or for non-standard implement input shaft configurations. To order a custom shaft, provide us with the extended length, compressed length, tractor-side spline specification, implement-side yoke interface dimensions, maximum operating angle, required torque rating, and clutch type preference. Our engineering team will calculate the correct telescoping profile overlap, tube diameter, and wall thickness for the application and provide a dimensional drawing for approval before production. Custom PTO shaft dimensions are typically available within 10-15 business days from drawing approval, and we accept custom OEM orders for agricultural equipment manufacturers requiring private-label driveline solutions as well.<\/p>\nQ: What is the difference between Category 5 and Category 6 PTO shaft categories?<\/strong>
\nA: PTO shaft sizes are classified into categories based on torque capacity and outer tube diameter. Category 5 (CAT 5) shafts are rated for approximately 1,800 Nm of continuous torque and use a specific cross-kit and tube profile sized for mid-range power applications, making them appropriate for the secondary and intermediate shaft positions on the Discbine. Category 6 (CAT 6) shafts are larger and rated for approximately 3,000 Nm of continuous torque with a correspondingly larger tube outer diameter and cross-kit size, making them appropriate for the main primary shaft position that must handle the full tractor PTO output in high-HP applications. Using a CAT 5 shaft in a position that requires a CAT 6 will result in shaft failure under normal operating loads. CMN Transmission clearly identifies the correct category for each shaft position in our Discbine-specific product listings.<\/p>\nQ: Does the PTO shaft guard meet CE safety standards and what maintenance does it require?<\/strong>
\nA: Yes. The complete PTO shaft cover supplied with CMN Transmission Discbine drivelines is designed and tested to comply with CE Machinery Directive requirements for rotating shaft guards, including minimum coverage length, radial clearance from the rotating shaft, end cap design, and chain anchor point strength. The guard tube should be inspected visually at each grease service interval for cracks, splits, or brittleness in the plastic, which can develop with age and UV exposure. Confirm that the guard rotates freely on its bearing relative to the shaft (it must not turn with the shaft) and that both anchor chains remain correctly attached. A worn bearing inside the guard end cap that allows the guard to rotate with the shaft must be replaced promptly, as the resulting friction will quickly destroy the guard and expose the rotating driveline.<\/p>\n![\"PTO](\"https:\/\/korea-transmission.com\/wp-content\/uploads\/2026\/04\/PTO-Shaft-for-New-Holland-Disc-Mower-22.webp\")
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\u0622\u0631\u0627\u0621 \u0627\u0644\u0639\u0645\u0644\u0627\u0621<\/h2>\n
\u0645\u0627\u0631\u0643\u0648\u0633 \u0647\u0648\u0644\u064a\u0646\u062c\u0633\u0648\u0631\u062b\u060c \u0645\u062f\u064a\u0631 \u0645\u0632\u0631\u0639\u0629\u060c \u0627\u0644\u0648\u0644\u0627\u064a\u0627\u062a \u0627\u0644\u0645\u062a\u062d\u062f\u0629<\/strong>
\n“Been running an H7450 on our 180-acre alfalfa operation in Ohio for going on seven years now. The original Weasler main shaft finally wore through the CV joint after four full cutting seasons. Ordered the CAT 6 replacement from CMN Transmission on a Tuesday and had it on my doorstep by Thursday. Fit was spot on, 1.750-20 spline slid right home and locked clean. We’re now 200+ hours into the new shaft across three cuttings and it’s been completely trouble-free. The guard quality is also noticeably better than the original, honestly. Would order from CMN again without even shopping around.”<\/p>\nKlaus Bergmann, Farmer, Germany<\/strong>
\n“We operate an H7560 on our farm in Bavaria and urgently needed a replacement shaft in the middle of the harvest season. CMN Transmission had the complete set of shafts: main shaft, 55N intermediate shaft with clutch, and secondary shaft available from stock. Delivery to Germany took only four working days. The FNT34 combination clutch is manufactured with absolute precision, and the torque limit is set very evenly. For our 100 HP application at 1000 RPM, this is exactly what we need. The price-performance ratio is clearly better than the OEM alternative from the dealer.”<\/p>\nThomas Whitaker, Agricultural Contractor, Australia
\n<\/strong> “I manage a contracting business in Victoria, Australia running two H7460 machines across multiple dairy farm clients. When you’re scheduling back-to-back cuts across different properties, you can’t afford machine downtime. CMN Transmission has been my go-to supplier for PTO shaft parts for three years now. The secondary 55N standard shafts I ordered last season came pre-greased, dimensionally perfect, and the clutch was preset correctly so I could bolt them on and go without any fiddling. That kind of fit-and-forget reliability is exactly what a contractor needs. I’ve recommended CMN to two other contractors in my area and they’re both regular customers now.”<\/p>\nDavid Hartley, Hay Farmer, Canada
\n<\/strong> “We’ve been operating an H7230 for 10 years on our mixed hay farm in Ontario. The machine had seen three different PTO shafts over that time, including two pricey Weasler units from the New Holland dealer. When the second one needed replacing I tried CMN Transmission on the recommendation of a neighbour. The 55N CV main shaft and the H8 double CV secondary shaft arrived well-packaged and in excellent condition. The main shaft is now going on its third full cutting season with zero issues. From a cost perspective I’m saving somewhere around 35-40% compared to dealer pricing. The technical team answered my spline sizing question on the same day by email, which I really appreciated.”<\/p>\nJean-Pierre Morin, Farmer, France<\/strong>
\n“Our agricultural operation in the Loiret has been using an H7330 since 2017. The original Bondioli and Pavesi power take-off shaft failed after six seasons, and the dealer\u2019s lead times were unacceptable during peak season. CMN Transmission shipped us the 55N standard replacement set from Korea in less than a week. The manufacturing quality is truly comparable to the original the universal joints rotate without play, and the telescopic profile slides perfectly. Customer service was very professional; they speak English well and answered all our technical questions. A reliable supplier that we recommend to our fellow farmers.”<\/p>\nJames MacIntyre, Farm Owner, New Zealand<\/strong>
\n“We run a large-scale ryegrass silage operation in the South Island of New Zealand with three Discbine units an H7450 and two H7550s. Sourcing PTO shaft parts used to be a logistical nightmare given how far we are from major suppliers. CMN Transmission changed that completely. Their web ordering system is clear, the model-specific shaft selector made it easy to specify the correct 55N Double CV configuration for the H7450, and the shipment arrived in Auckland within six working days. All three shafts we’ve ordered over the past two seasons have fitted first time with no modifications. Solid product, good price, and the kind of delivery speed that actually respects a farmer’s schedule.”<\/p>\nCarlos Eduardo Mendes, Rural Producer, Brazil<\/strong>
\n“We work with an H7460 in Rio Grande do Sul cutting ryegrass and clover for hay and silage. When the drive shaft broke in the middle of the harvest, I contacted CMN Transmission urgently. They responded in less than two hours with the correct specification for the 55N shaft with combination clutch for the 1000 RPM model. The product arrived well-packaged and in perfect condition. The machining quality is clearly superior to the generic shaft we used previously no play in the yokes, and the telescopic profile moves without resistance. We will certainly purchase again and have already recommended it to other producers in the region.”<\/p>\nRichard Pemberton, Farm Manager, United Kingdom
\n<\/strong> “I manage a 500-acre mixed farm in Shropshire and we’ve run an H7320 for years on our 540 PTO system. What I appreciate most about CMN Transmission is their technical knowledge, not just their prices. When I wasn’t sure whether I needed the 35N CV or the 35N Square shaft for my secondary position, I rang them up and spoke to someone who actually knew the Discbine product range in detail. They walked me through the identification process and confirmed the correct specification inside five minutes. The shaft arrived in two days and fitted without issue. That combination of product knowledge and efficient logistics is what keeps me coming back. I’ve since ordered the slip clutch assembly separately as a maintenance spare.”<\/p>\nAlejandro Ruiz, Owner, Argentina<\/strong>
\n“We have an H7230 in our agricultural services company in the province of Buenos Aires, primarily cutting alfalfa and improved pastures. The original PTO shaft had worn out at the universal joint after five seasons, and the costs from the local dealer were prohibitive. CMN Transmission offered the exact 55N CV shaft replacement at 40% less than the OEM price. Delivery arrived in Buenos Aires in eight business days, everything correct and with no damage to the packaging. The fit was perfect, with no need for adapters. We are now completing two full cutting seasons without any issues. The customer service team is very clear and helpful in email communications.”<\/p>","protected":false},"excerpt":{"rendered":"CMN Transmission manufactures high-quality PTO shafts for New Holland Discbine models H7220, H7230, H7320, H7330, H7450, H7460, H7550, and H7560 disc mower-conditioners. Each disc mower PTO shaft is engineered as a direct replacement for the original Weasler or Bondioli & Pavesi factory-installed units, with no modifications required for installation. Whether you operate a compact 65 HP side-pull H7220 or a heavy-duty 100 HP center-pivot H7560, our agricultural PTO shaft lineup covers the full power range from 540 RPM entry-level models right through to 1000 RPM high-output configurations.<\/p>","protected":false},"featured_media":6981,"comment_status":"open","ping_status":"closed","template":"","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":""},"product_brand":[],"product_cat":[222,262],"product_tag":[232,228,242,234,264,233,226,229,263,265,235,243,225,230,231,224],"class_list":{"0":"post-6998","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-pto-shafts","7":"product_cat-pto-shaft-for-discbine","8":"product_tag-1000-pto-shaft","9":"product_tag-540-pto-shaft","10":"product_tag-agricultural-pto-shaft","11":"product_tag-custom-pto-shaft","12":"product_tag-disc-mower-pto-shaft","13":"product_tag-heavy-duty-pto-shaft","14":"product_tag-pto-drive-shafts","15":"product_tag-pto-driveline-shaft","16":"product_tag-pto-shaft-for-disc-mower","17":"product_tag-pto-shaft-for-discbine","18":"product_tag-pto-shaft-for-tractor","19":"product_tag-pto-shaft-manufacturers","20":"product_tag-pto-shafts","21":"product_tag-pto-shafts-for-sale","22":"product_tag-tractor-pto-drive-shaft","23":"product_tag-tractor-pto-shaft","25":"first","26":"instock","27":"shipping-taxable","28":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/korea-transmission.com\/ar\/wp-json\/wp\/v2\/product\/6998","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/korea-transmission.com\/ar\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/korea-transmission.com\/ar\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/korea-transmission.com\/ar\/wp-json\/wp\/v2\/comments?post=6998"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/korea-transmission.com\/ar\/wp-json\/wp\/v2\/media\/6981"}],"wp:attachment":[{"href":"https:\/\/korea-transmission.com\/ar\/wp-json\/wp\/v2\/media?parent=6998"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/korea-transmission.com\/ar\/wp-json\/wp\/v2\/product_brand?post=6998"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/korea-transmission.com\/ar\/wp-json\/wp\/v2\/product_cat?post=6998"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/korea-transmission.com\/ar\/wp-json\/wp\/v2\/product_tag?post=6998"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
![\"\u0639\u0645\u0648\u062f](\"https:\/\/korea-transmission.com\/wp-content\/uploads\/2026\/04\/PTO-Shaft-for-New-Holland-Discbine-4.webp\")
<\/p>\n![\"\u0639\u0645\u0648\u062f](\"https:\/\/korea-transmission.com\/wp-content\/uploads\/2026\/04\/PTO-Shaft-for-New-Holland-Discbine-10.webp\")
<\/p>\n![\"\u0639\u0645\u0648\u062f](\"https:\/\/korea-transmission.com\/wp-content\/uploads\/2026\/04\/PTO-Shaft-for-New-Holland-Discbine-6.webp\")
<\/p>\n![\"\u0639\u0645\u0648\u062f](\"https:\/\/korea-transmission.com\/wp-content\/uploads\/2026\/04\/PTO-Shaft-for-New-Holland-Discbine-9.webp\")
<\/p>\n![\"\u0639\u0645\u0648\u062f](\"https:\/\/korea-transmission.com\/wp-content\/uploads\/2026\/04\/PTO-Shaft-for-New-Holland-Discbine-7.webp\")
<\/p>\n![\"\u0639\u0645\u0648\u062f](\"https:\/\/korea-transmission.com\/wp-content\/uploads\/2026\/04\/PTO-Shaft-for-New-Holland-Discbine-8.webp\")
<\/p>\n![\"PTO](\"https:\/\/korea-transmission.com\/wp-content\/uploads\/2026\/04\/PTO-Shaft-for-New-Holland-Disc-Mower-27.webp\")
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