Factory Price RA Series Overrunning Clutch for PTO Shaft, Torque Limiter Shaft Parts

Offering high-quality torque limiter clutches for PTO shafts at factory prices, our brand new RA Series Overrunning Clutch is suitable for a wide range of applications including manufacturing plants, machinery repair shops, farms, retail, construction works, food & beverage shops, and many others. With a weight of 5 KG, this clutch is built with robust steel material to withstand the demands of heavy-duty applications. The clutch is customizable in size and color to meet the specific needs of your machinery. The product is packaged in a wooden case for safe transportation and comes with a 1-year warranty for peace of mind. Our RA Series Overrunning Clutch provides reliable performance and is an ideal choice for tractors and various agricultural machinery.

RA Overrunning Clutch

Specifications of Overrunning Clutch for PTO Shaft

Model Number
OEM Steel overrunning clutch 1 3/8''Z6 spline for pto shaft parts
Drive Shaft Parts & Power Transmission
Kinds of Tractors & Farm Implements
Brand Name
Yoke Type
Double push pin,Bolt pins,Split pins,Push pin,Quick release,Ball attachment,Collar.....
Processing Of Yoke
Plastic Cover
Green;Orange;Yellow;Black Ect.
T1-T10; L1-L6;S6-S10;10HP-150HP with SA,RA,SB,SFF,WA,CV Etc
Tube Type
Lemon,Trianglar,Star,Square,Hexangular,Spline,Special Ect
Processing Of Tube
Cold drawn
Spline Type
1 1/8" Z6;1 3/8" Z6; 1 3/8" Z21 ;1 3/4" Z20; 1 3/4" Z6; 8-38*32*6 8-42*36*7; 8-48*42*8;
Place of Origin
Haining, China (Mainland)

Advantages of RA Overrunning Clutch for Tractor PTO Shaft

An RA overrunning clutch is a specialized mechanical device often used in conjunction with tractor PTO shafts. This clutch offers several advantages, particularly in applications where the implement needs to maintain momentum independently of the tractor's drive. Here are some key advantages of using an RA overrunning clutch for a tractor PTO shaft:

  1. Prevents Driveline Damage: The RA overrunning clutch disengages the PTO shaft when the implement's rotational speed exceeds that of the tractor's PTO. This feature prevents potential driveline damage that can occur if the implement continues to drive the PTO shaft after the tractor has stopped or slowed down.
  2. Safety Enhancement: By allowing the implement to overrun freely, the clutch enhances operational safety. It prevents the tractor from being pushed by the momentum of the implement, which is particularly important when the tractor is slowing down or stopped.
  3. Smooth Operation: The clutch ensures smoother operation of both the tractor and the implement. It helps in reducing shock loads on the PTO shaft and the transmission, leading to less wear and tear on these components.
  4. Increased Efficiency: The RA overrunning clutch allows for more efficient power transmission. The tractor's power is used solely for driving the implement rather than overcoming the inertia of the implement's moving parts.
  5. Versatility: This clutch type is suitable for a wide range of agricultural implements, especially those that can maintain or generate momentum, like mowers, balers, and rotary cutters. This versatility makes it a valuable component in various farming operations.

Applications of the RA Overrunning Clutch for Tractor PTO Shaft

The PTO overrunning clutch for tractors finds its use in various agricultural and mechanical applications. This type of clutch is particularly beneficial in situations where an implement needs to maintain or generate its own momentum. Here are some key applications:

  • Mowing and Cutting Equipment: In mowers and cutters, the PTO overrunning clutch allows the cutting blades to continue spinning freely when the tractor is slowing down or stopped. This is essential for a consistent cutting performance and helps prevent turf damage.
  • Hay Balers: In hay balers, the clutch facilitates continuous operation of the baling mechanism, even when the tractor's PTO is not engaged. This smooth operation is crucial for efficient baling, especially when the tractor is turning or adjusting its speed.
  • Rotary Tillers: When used with rotary tillers, the overrunning clutch allows the tines to rotate independently at their own speed, improving soil cultivation efficiency and reducing strain on the tractor's transmission.
  • Harvesting Equipment: Harvesters, such as grain and forage harvesters, benefit from the PTO overrunning clutch by allowing continuous operation of the harvesting mechanism, thereby ensuring consistent and efficient crop collection.
  • Seeders and Planters: For seeders and planters, the clutch ensures that the seeding mechanism can continue operating independently, providing uniform seed distribution even when the tractor's motion is interrupted.

RA Overrunning Clutch Applications

Agricultural PTO Shaft Torque Limiter Types

In agricultural machinery, PTO shaft torque limiters are crucial for protecting equipment from damage due to torque overload. There are various types of PTO shaft torque limiters, each designed to cater to different operational needs and specifications. Here's an overview of the common types:

  1. Shear Bolt Torque Limiter: This type utilizes a shear bolt that breaks under excessive torque, disconnecting the drive between the tractor and implement. Common in a variety of implements; ideal for situations where overload conditions are clear and easily detectable.
  2. Friction Clutch Torque Limiter: Friction clutch limiters slip when the torque exceeds a preset level, allowing it to absorb the excess force without breaking.Used in applications where gradual overload conditions might occur and frequent replacement of shear bolts is not desirable.
  3. Ratchet Torque Limiter: Features a ratcheting mechanism that allows rotation in one direction and locks or slips in the opposite direction when overloaded. Suitable for implements like augers where unidirectional operation is required.
  4. Overrunning Clutch Torque Limiter: Allows free rotation in one direction and engages the clutch in the other. It can also incorporate a torque-limiting feature to disconnect under overload. Commonly used in mowers and rotary cutters, allowing the implement to overrun when the tractor slows down.

PTO Shaft Torque Limiter Types

How Does the Overrunning Clutch for Tractor PTO Shaft Work?

The overrunning clutch for a tractor's PTO shaft is a mechanical device designed to allow the shaft to rotate freely in one direction while locking in the opposite direction. This clutch is especially important in applications where an implement needs to maintain momentum independently of the tractor's PTO speed. Here's how it works:

  1. Free Rotation in One Direction: The overrunning clutch allows the PTO shaft to rotate freely in one direction. This means that if the implement attached to the PTO shaft (like a mower or baler) is moving faster than the PTO shaft itself, the clutch will disengage, allowing the implement to spin freely.
  2. Locking in the Opposite Direction: In the opposite direction, the clutch engages, locking the PTO shaft and the implement together. This ensures that the power from the tractor's engine is transmitted to the implement when needed.
  3. Ramp and Roller Design: When the PTO shaft tries to drive the implement at a lower speed than the implement's current speed, the rollers roll up the ramps and disengage, allowing the implement to overrun.
  4. Engagement During Normal Operation: When the tractor's PTO shaft is driving the implement at a higher speed, the rollers are forced against the ramps, creating a lock that transmits the power from the tractor to the implement.
  5. Automatic Disengagement: This disengagement process happens automatically. When the tractor slows down, stops, or the implement's inertia causes it to rotate faster than the PTO shaft, the clutch disengages, allowing the implement to continue its motion without driving the PTO shaft.

RA Overrunning Clutch Working Principle

How to Install the Overrunning Clutch to PTO Shaft?

Installing an overrunning clutch to a tractor's PTO shaft is a straightforward process, but it requires attention to detail and adherence to safety protocols. Here's a step-by-step guide to help you install an overrunning clutch:

  1. Clean the PTO Shaft: Clean any dirt, debris, or grease from the PTO shaft to ensure a clean connection point for the overrunning clutch.
  2. Align the Clutch: Slide the overrunning clutch onto the PTO shaft, making sure it aligns correctly. The shaft and clutch splines should match and fit snugly.
  3. Secure the Clutch: Once aligned, secure the clutch onto the shaft. This may involve tightening a set screw or bolt, depending on the clutch design. Ensure it is firmly attached and there is no play.
  4. Lubrication: Apply a suitable grease to the PTO shaft and the internal parts of the clutch as per the manufacturer's recommendations. This helps in smooth operation and prolongs the life of both the shaft and the clutch.
  5. Attach Implement: After the clutch is secured, attach the implement to the other end of the overrunning clutch. Make sure the connection is secure and the implement is properly aligned with the tractor.
  6. Safety Check: Perform a visual inspection to ensure everything is secured correctly. There should be no loose parts or misalignments.

RA Overrunning Clutch

Maintenance Tips for Overrunning Clutch on Tractor PTO Shaft

An overrunning clutch is often installed on the PTO shaft to allow the implement to rotate freely when the tractor's PTO is disengaged or rotating at a slower speed. Regular maintenance is necessary to ensure the proper functioning and longevity of the overrunning clutch. Here are some maintenance tips for an overrunning clutch on a tractor PTO shaft:

  1. Clean and inspect regularly: Remove any dirt, debris, or buildup from the clutch assembly. Inspect the components for wear, damage, or signs of excessive wear.
  2. Lubrication: Apply a suitable lubricant to the clutch components as recommended by the manufacturer. Proper lubrication reduces friction and ensures smooth operation.
  3. Regular testing: Test the overrunning clutch periodically to ensure proper operation. Engage and disengage the PTO shaft while observing the clutch's behavior. Look for any abnormal noises, slipping, or hesitation.
  4. Replace worn or damaged parts: If you notice any significant wear or damage during inspection or testing, replace the affected parts promptly. Using worn-out components can lead to further damage and potential failure.

RA Overrunning Clutch

Why Choose HZPT's Overrunning Clutch for PTO Shaft?

HZPT specialize in developing, manufacturing, and marketing PTO shafts, agricultural gearboxes, PTO shaft accessories, PTO shaft u-joints, torque limiters, PTO shaft tubes, PTO shaft yokes, PTO shaft adaptors, industrial cardan shafts, car driveshafts, u-joint coupling shafts, etc. The annual turnover is 60 million RMB, 9 Million Dollars, and it is increasing year by year. Our products gained a great reputation from European, American, Asia, Australian, and North American customers. We are the top professional OEM supplier for many agricultural implement factories in the domestic market.

We already have the CE, TS/16949, and ISO9001 certificates with systematic manufacturing types of equipment and a QC team to guarantee our quality and delivery. We warmly welcome every friend to visit us and establish a mutually beneficial long-term relationship cooperation. Currently, our company exports its products to its valued customers in more than 50 countries in 5 continents of the world. Having the best-in-class brands in its product range, HZPT continues its activities with the aim of becoming a global company in the fields it works.

PTO Shaft Accessories

With our professional team, international certifications, and customized services, we ensure the quality and reliability of our products. Our production facilities are equipped with advanced machinery and technology, enabling us to deliver products that meet the highest industry standards. We also provide comprehensive after-sales services, including technical support and spare part supply, to ensure our customers' satisfaction. At HZPT, we strive to provide the best solutions for your agricultural and mechanical needs.

Author: Yjx



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