HZPT New OEM Factory China Overrunning Clutches For Transmission Shaft Accessories

Introducing the new HZPT OEM factory-made overrunning clutches from China, specifically designed for transmission shaft accessories. This product is brand new and comes with a 1-year warranty. It is suitable for various industries, ranging from manufacturing plants, machinery repair shops, farms, retail establishments, construction works, food and beverage shops, among others. Weighing a mere 5 KG, this product can be used in tractors and other agricultural machinery.

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 the HZPT Overrunning Clutches

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:

  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, preventing potential driveline damage.
  2. Safety Enhancement: By allowing the implement to overrun freely, the clutch enhances operational safety.
  3. Smooth Operation: The clutch ensures smoother operation of both the tractor and the implement, reducing wear and tear on these components.
  4. Increased Efficiency: The RA overrunning clutch allows for more efficient power transmission.
  5. Versatility: This clutch type is suitable for a wide range of agricultural implements, enhancing its value in farming operations.

RA Overrunning Clutch

Applications of the Overrunning Clutch

The PTO overrunning clutch for tractors finds its use in various agricultural and mechanical applications. Here are some key applications:

  1. 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.
  2. Hay Balers: In hay balers, the clutch facilitates continuous operation of the baling mechanism, even when the tractor's PTO is not engaged.
  3. Rotary Tillers: When used with rotary tillers, the overrunning clutch allows the tines to rotate independently at their own speed.
  4. Harvesting Equipment: Harvesters, such as grain and forage harvesters, benefit from the PTO overrunning clutch by allowing continuous operation of the harvesting mechanism.
  5. Seeders and Planters: For seeders and planters, the clutch ensures that the seeding mechanism can continue operating independently.

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. Here's an overview of the common types:

  • Shear Bolt Torque Limiter: This type utilizes a shear bolt that breaks under excessive torque, disconnecting the drive between the tractor and implement.
  • Friction Clutch Torque Limiter: Friction clutch limiters slip when the torque exceeds a preset level, allowing it to absorb the excess force without breaking.
  • Ratchet Torque Limiter: Features a ratcheting mechanism that allows rotation in one direction and locks or slips in the opposite direction when overloaded.
  • 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.

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. Here's how it works:

  1. Free Rotation in One Direction: The overrunning clutch allows the PTO shaft to rotate freely in one direction.
  2. Locking in the Opposite Direction: In the opposite direction, the clutch engages, locking the PTO shaft and the implement together.
  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.

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.
  4. Lubrication: Apply a suitable grease to the PTO shaft and the internal parts of the clutch as per the manufacturer's recommendations.
  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.

Maintenance of the Overrunning Clutch

Regular maintenance is necessary to ensure the proper functioning and longevity of the overrunning clutch. Here are some maintenance tips:

  • 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.
  • Lubrication: Apply a suitable lubricant to the clutch components as recommended by the manufacturer. Proper lubrication reduces friction and ensures smooth operation.
  • Regular Testing: Test the overrunning clutch periodically to ensure proper operation.
  • Replace Worn or Damaged Parts: If you notice any significant wear or damage during inspection or testing, replace the affected parts promptly.

Why Choose HZPT's Overrunning Clutch for PTO Shaft?

HZPT is a reputable brand known for 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, and u-joint coupling shafts. Our products have earned a great reputation from our European, American, Asian, Australian, and North American customers. We are the top professional OEM supplier for many agricultural implement factories in the domestic market.

PTO Shaft Accessories

Our company operates on the principles of Quality first, Deliver quickly, and Price Competitive. We already have the CE, TS/16949, and ISO9001 certificates, and our systematic manufacturing equipment and QC team guarantee our quality and delivery. Currently, our company exports its products to valued customers in more than 50 countries across 5 continents. With the best-in-class brands in our product range, HZPT is determined to become a global company in the fields we serve.

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