Deskripsi
80HP Triangular PTO Shaft Yoke for Tractor & Trailer Driveline
Forged-Steel Tractor PTO Yoke | Series 4 Compatible | 1-Year Warranty
Product Overview
This 80HP-rated PTO shaft yoke is a triangular-profile connection component engineered for tractor-to-implement power transfer in demanding agricultural and trailer applications. As one of the most failure-prone points in any PTO driveline, the yoke must withstand continuous rotational stress at 540 RPM while maintaining precise alignment between the universal joint and the telescoping tube.
Built from forged alloy steel and heat-treated for surface hardness above HRC 58, this tractor PTO yoke is designed to handle up to 80 horsepower at 540 RPM — placing it in the Series 4/44R performance tier recognized across the agricultural driveline parts industry. The triangular bore profile matches standard triangular tubing, providing a positive anti-rotation lock that round or keyed bore yokes cannot achieve under high-torque cycling.
Each unit ships with factory-applied rust inhibitor and pre-drilled grease ports. Backed by a 1-year warranty, this yoke is a direct-fit replacement for worn or damaged components in rotary cutters, balers, tillers, and other PTO-driven farm implements.
Technical Specifications
| Horsepower Rating | 80 HP @ 540 RPM |
| Yoke Profile | Triangular (Tri-lobe) |
| Series Compatibility | Series 4 (44R equivalent) |
| Material | Forged alloy steel, heat-treated (HRC ≥ 58) |
| PTO Speed | 540 RPM (standard agricultural PTO) |
| Spline Option | 1-3/8″ 6-spline (standard North American) |
| Lubrication | Pre-drilled grease fitting port |
| Warranty | 1 Year |
| Condition | Brand New |
Product Gallery
Key Features of This High-Strength 80HP PTO Shaft Yoke
- Triangular Profile Lock: The tri-lobe bore geometry prevents rotational slip on the telescoping tube, maintaining torque integrity at continuous 540 RPM operation — a measurable advantage over round-bore designs in high-vibration environments.
- 80 HP Capacity at 540 RPM: Rated for the Series 4 / 44R power class, this yoke handles implements drawing up to 80 horsepower without exceeding its fatigue limit — suitable for mid-to-heavy-duty rotary cutters, balers, and power harrows.
- Forged & Heat-Treated Steel: Drop-forged from alloy steel and hardened to HRC 58+, delivering impact resistance and wear life that cast yokes typically cannot match in field conditions.
- Integrated Grease Port: Factory-drilled zerk fitting point enables scheduled lubrication without disassembly, reducing maintenance downtime during peak season.
- Direct-Fit Replacement: Dimensions and spline profiles follow industry-standard Series 4 specifications, allowing drop-in replacement on existing PTO driveline assemblies from major OEM and aftermarket suppliers.
Applications of PTO Drive Shaft Yoke in Agricultural Machinery
A high-strength 80HP PTO shaft yoke for agricultural implements serves as the mechanical link between the tractor’s power take-off and any implement requiring rotary input. Below are the primary machinery categories where this triangular yoke is applied:
- Rotary Cutters & Flail Mowers: PTO yokes transmit engine torque to cutting decks operating at 540 RPM. An 80HP-rated yoke is essential for cutters working dense brush or tall grass over widths of 5–7 feet.
- Round & Square Balers: The baling cycle creates cyclical shock loads as crop material compresses. A properly rated PTO shaft yoke absorbs these peaks without cracking or deforming.
- Rotary Tillers & Power Harrows: Soil-engaging implements generate sustained high-torque demand. Triangular yokes eliminate the rotational backlash that round-bore connections can introduce during direction reversals.
- Manure Spreaders: Corrosive operating environments and uneven loading patterns make forged steel yokes a practical choice for spreader drivelines rated at 60–80 HP.
- Feed Mixers & Grain Augers: Consistent power delivery is critical for uniform mixing and grain transfer. A precision-machined PTO yoke minimizes vibration, extending bearing life in the implement gearbox.
- Seeders & Planters: PTO-driven seeders rely on smooth shaft rotation for even seed distribution. A tight-tolerance yoke connection prevents inconsistent RPM delivery that can cause uneven planting rows.
This yoke is also used in non-agricultural settings including trailer-mounted generators, wood chippers, and industrial pump drives where a 540 RPM PTO input is specified.
How to Replace Yoke on PTO Shaft
Replacing a worn or damaged PTO shaft yoke is one of the most common driveline maintenance tasks in farming. Follow these six steps to ensure a safe, correct installation:
Step 1 – Secure the Shaft & Remove Fasteners.
Disengage the PTO and shut down the tractor engine. Lock the shaft in a bench vise or use a holding fixture. Identify the retaining fastener (roll pin, snap ring, or bolt) that secures the old yoke and remove it with the correct tool. Avoid using oversized tools that could damage the shaft splines.
Step 2 – Slide Off the Old Yoke.
Pull the yoke straight off the tube or splined stub. If corrosion has seized the joint, apply a penetrating lubricant (e.g., PB Blaster) and wait 10–15 minutes. Tap around the yoke base with a soft-face mallet to break the bond — never use a steel hammer directly on the yoke ears.
Step 3 – Inspect the Tube & Splines.
Before installing the new yoke, check the triangular tube or splined shaft for scoring, wear ridges, or deformation. Replace the tube section if measurable wear exceeds 0.010″ on any lobe face.
Step 4 – Prepare & Install the New Yoke.
Apply a thin film of anti-seize compound on the tube contact surface. Slide the new triangular PTO shaft yoke onto the tube, aligning it correctly with the cross-hole positions. Insert the retaining fastener and confirm it seats fully.
Step 5 – Lubricate All Grease Points.
Pump grease into the yoke’s zerk fitting and both universal joint caps until fresh grease appears at each seal. This step is critical — approximately 34% of premature PTO yoke failures trace back to insufficient lubrication at installation.
Step 6 – Reconnect & Test.
Reattach the PTO shaft to the tractor PTO stub and the implement input. Verify alignment, confirm safety shields are in place, and run the PTO at low RPM for 30 seconds to check for vibration or unusual noise before operating under load.
Pertanyaan yang Sering Diajukan
1. What series size does this PTO shaft yoke fit?
This yoke is designed for Series 4 (44R) PTO drivelines rated up to 80 HP at 540 RPM. It matches standard triangular profile tubing and 1-3/8″ 6-spline tractor stubs used across most North American and European agricultural equipment.
2. Can I use this triangular yoke to replace a rectangular one?
No. Triangular yokes only fit triangular-profile tubes. Using a triangular yoke on a rectangular tube (or vice versa) will result in improper seating, torque loss, and potential shaft failure. Always verify your tube profile before ordering.
3. How often should I grease this PTO yoke?
Lubricate the yoke and universal joint every 8 operating hours or at the start of each work session. In dusty or wet conditions, increase frequency to every 4–6 hours. Use NLGI #2 lithium-complex grease for optimal protection.
4. Is this yoke compatible with 1000 RPM PTO systems?
This yoke is rated for 540 RPM PTO operation. While the physical dimensions may fit a 1000 RPM shaft, the torque and speed ratings differ significantly. For 1000 RPM applications, select a yoke specifically rated for that speed class.
5. What is the warranty coverage on this yoke?
A 1-year warranty covers material defects and manufacturing faults under normal operating conditions. Damage from overloading beyond 80 HP, improper installation, or lack of lubrication is not covered. Contact us within the warranty period with your order number for claims.
Recommended Companion Parts
A PTO shaft yoke operates as part of a complete driveline assembly. To ensure full compatibility and extended service life, consider pairing this yoke with the following components:
| Component | Function |
|---|---|
| Universal Joint (Cross & Bearing Kit) | Allows angular movement between yokes; must match the Series 4 cross size for this yoke. |
| Triangular PTO Tubing (Inner & Outer) | Provides the telescoping shaft body. Triangular profile must match this yoke’s bore geometry. |
| PTO Safety Shield & Bearing | Mandatory protective cover over rotating shaft; shield bearings allow free rotation without contact. |
| Shear Bolt / Friction Clutch Torque Limiter | Protects the driveline from sudden overload spikes by disconnecting or slipping before components fail. |
| Tractor-End Spline Yoke (Quick Disconnect) | Connects the shaft assembly to the tractor PTO stub; quick-disconnect pins simplify attachment and detachment. |
| Overrunning Coupler (Freewheel) | Prevents implement momentum from back-driving the tractor PTO when the driveline is disengaged. |
Ready to Order? Get a Quote Today.
Whether you need a single replacement yoke or bulk quantities for your parts inventory, we offer competitive per-unit pricing with volume discounts starting at 10 pieces. Every PTO shaft yoke ships with inspection documentation and a 1-year warranty.
Contact our driveline parts team to confirm specifications for your equipment, request a formal quotation, or ask about custom spline configurations. Typical lead time for standard orders is 7–15 business days.
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