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Forged 1045C PTO Shaft Yoke – End Yoke for Tractor Drivelines
Model 8.05.05B | 1 3/8″ Z6 Spline | Forged Medium-Carbon Steel | Agricultural Driveline Component
Forged 1045C PTO Shaft Yoke Product Overview
The 8.05.05B PTO shaft yoke is a forged end yoke that connects a tractor’s power take-off output to the universal joint at the implement end of the PTO driveline. Every time power leaves the tractor and enters a mower, baler, or tiller, it passes through this connection point — making yoke material quality and dimensional accuracy directly responsible for driveline lifespan.
This yoke is drop-forged from AISI 1045C medium-carbon steel (0.45% C, tensile strength 570–700 MPa, Brinell hardness 170–210 HB in normalized condition). After forging, it can be induction-hardened to reach surface hardness of Rc 54–60 at critical wear surfaces, giving it a measurable advantage over cast alternatives in impact resistance and fatigue life. The 35×106.5 mm profile is sized for standard 1 3/8″ six-spline (Z6) PTO shafts running at 540 RPM — the most common configuration across North American and European farm equipment.
Finished in a high-visibility yellow coating for corrosion resistance and easy identification during field maintenance, this universal joint yoke is a drop-in replacement for worn or damaged end yokes on Series 1 through Series 4 driveline assemblies.
Technical Specifications-Forged 1045C PTO Shaft Yoke
| Model Number | 8.05.05B End Yoke |
| Yoke Dimensions | 35 × 106.5 mm |
| Spline Configuration | 1 3/8″ six-spline (Z6) |
| Material | AISI 1045C forged medium-carbon steel (tensile strength 570–700 MPa) |
| Surface Hardness (after induction hardening) | Rc 54–60 |
| PTO Speed Rating | 540 RPM (standard agricultural PTO) |
| Finish | Yellow anti-corrosion coating |
| Yoke Type | Implement end yoke (spline bore) |
| Condition | Brand New – OEM-grade replacement |
Forged 1045C PTO Shaft Yoke Product Gallery
Applications of PTO Drive Shaft Yoke in Agricultural Machinery
The PTO shaft yoke sits at the junction between tractor power and implement function. Without a properly rated yoke, the entire PTO driveline cannot transmit torque. Below are the key equipment categories where this 1045C forged end yoke is commonly deployed:
- Rotary Mowers & Brush Cutters: Finish mowers, flail mowers, and heavy brush cutters depend on the universal joint yoke to channel tractor output to the cutter gearbox. At 540 RPM continuous operation, a forged yoke withstands the cyclic torsional loads generated by blade impact on uneven vegetation.
- Balers & Hay Equipment: Round balers, square balers, hay rakes, tedders, and mergers all draw power through the PTO driveline. During the baling compression cycle, peak torque can spike 2–3× above steady-state levels. A 1045C forged yoke resists the fatigue cracking that cast yokes often develop after 1–2 seasons under these conditions.
- Tillage & Soil Preparation: Plows, disc harrows, rotary tillers, and power harrows require sustained torque to break and turn soil. The PTO shaft yoke absorbs both steady load and sudden shock when blades contact rocks or buried debris, protecting the downstream gearbox from damage.
- Spreaders: Fertilizer spreaders, manure spreaders, and lime distributors use PTO power to drive agitator or spinner mechanisms. A replacement PTO shaft yoke for 540 RPM farm implements in this category must tolerate corrosive chemical exposure alongside mechanical load, making the yellow-coated 1045C variant a practical fit.
- Grain Handling & Augers: Grain augers, bin sweeps, and conveyor drives transfer bulk material at high volume. Smooth, vibration-free yoke engagement prevents grain spillage and reduces wear on auger bearings and bushings.
- Sprayers & Pumps: Boom sprayers and tractor-mounted spray rigs rely on PTO-driven pumps for consistent chemical delivery. Even minor driveline vibration from a worn yoke can disrupt spray pressure, leading to uneven field coverage and wasted product.
Beyond agriculture, this end yoke is also used in PTO-driven wood chippers, post-hole diggers, snow blowers, and trailer-mounted generators where a 1 3/8″ Z6 input is specified.
Maintenance Guide: Keeping Your PTO Shaft Yoke in Service
A PTO yoke that is properly maintained will outlast the implement it powers. Neglect the yoke, and you risk spline wear, universal joint seizure, and unexpected driveline failure during peak season. Follow this maintenance schedule to protect your investment:
Every 8 Operating Hours – Lubricate.
Apply NLGI #2 lithium-complex grease to every zerk fitting on the yoke and the adjacent universal joint. Pump grease until a small amount of fresh lubricant purges from each U-joint seal. For telescoping shafts, extend the tube fully, grease the inner splines, then retract to distribute evenly. Over-greasing is just as harmful as under-greasing — excess grease creates hydraulic lock inside the U-joint caps and can blow out seals.
Every 50 Operating Hours – Inspect.
Disconnect the PTO shaft from both the tractor and implement. Clean the yoke with a degreaser and inspect the spline teeth for ridging, pitting, or measurable wear. Check the cross-holes for elongation and examine the yoke ears for hairline cracks. Any axial play exceeding 0.5 mm at the spline interface indicates the yoke should be replaced. Also verify that the retaining pin or snap ring is undamaged and seats properly.
Start of Each Season – Full Check.
Before the first field day of the season, perform a complete driveline review: confirm yoke-to-shaft alignment (both yokes should form a parallel “H” pattern when sighted along the shaft axis), test the telescoping tube for smooth slide action, and replace any universal joint that shows clicking or binding during hand rotation. Verify that safety shields are intact and rotating freely on their bearings.
Storage – Off-Season Protection.
Before storing equipment, clean the yoke surface, apply a fresh coat of grease to exposed splines, and store the shaft horizontally. Keeping the shaft fully retracted prevents moisture from pooling inside the telescoping joint. If possible, store indoors to avoid rust buildup on uncoated steel surfaces.
الأسئلة الشائعة
1. What PTO shaft does this yoke fit?
It fits standard 1 3/8″ six-spline (Z6) PTO shafts operating at 540 RPM. This covers the majority of agricultural tractors in the 15–80 HP range sold in North America and Europe.
2. Is forged 1045C better than a cast yoke?
Yes. Forged 1045C has tensile strength of 570–700 MPa versus approximately 350–450 MPa for typical gray cast iron. Forging also aligns the steel’s grain structure, improving fatigue resistance by 30–40% under cyclic PTO loads.
3. Can I use this yoke on a 1000 RPM PTO system?
No. This yoke is dimensioned for 540 RPM shafts (1 3/8″ Z6). The 1000 RPM standard uses a 1 3/8″ 21-spline (Z21) stub. Installing the wrong spline count will result in no engagement or immediate failure.
4. How do I know when to replace a PTO shaft yoke?
Replace the yoke if you see visible spline wear ridges, cracks on the yoke ears, axial play exceeding 0.5 mm, or if the universal joint shows binding. Unusual vibration during PTO operation is another reliable indicator.
5. Do you supply this yoke in bulk for agricultural PTO shaft yoke supplier orders?
Yes. Volume pricing starts at 20 units. Each batch ships with dimensional inspection reports. OEM branding and custom color coatings are available on orders above 100 pieces. Contact us for a quote.
What Our Customers Say
★★★★★ — Mark T., Kansas, USA
“I run a 65 HP tractor on 320 acres of mixed hay and wheat. The cast yoke I had before cracked after two baling seasons. Switched to this forged 1045C model last spring — it’s been through 400+ hours of baling and mowing without a single issue. The spline fit was dead-on, no filing or forcing needed. Already ordered three more for my other implements.”
★★★★★ — Diego R., São Paulo, Brazil
“My old yoke had more play in it than my dog has in a mud puddle. Bolted this one on and the vibration disappeared — my rotary cutter actually cuts in a straight line now instead of inventing new field patterns. Shipping was fast, grease port lined up perfectly, and the yellow finish makes it the best-dressed part on the whole tractor. 10/10, my tractor has never looked this professional.”
Recommended Companion Parts
A PTO shaft yoke is one link in a multi-component driveline. Pairing it with matched parts prevents weak-point failures and ensures rated performance across the full assembly:
| Component | Role in the PTO Driveline |
|---|---|
| Universal Joint (Cross & Bearing Kit) | Provides angular flexibility between the yoke pair. Must match the series cross dimensions of this end yoke for proper bearing cap seating. |
| PTO Tubing (Inner & Outer Telescoping Tube) | The shaft body that slides to adjust driveline length. Available in triangular, lemon, star, and rectangular profiles depending on series. |
| Tractor-End Quick-Disconnect Yoke | Connects the PTO shaft to the tractor PTO stub via push-pin release. Spline count must match the tractor output (Z6 or Z21). |
| Safety Shield & Shield Bearing | Plastic guard covering the rotating shaft to prevent entanglement. Shield bearings allow the guard to remain stationary while the shaft spins inside. |
| Torque Limiter (Shear Bolt or Friction Clutch) | Disconnects the driveline when torque exceeds a safe threshold, protecting both the yoke and the implement gearbox from overload damage. |
| Overrunning Coupler (Freewheel) | Prevents implement inertia from back-driving the tractor PTO after disengagement, protecting the transmission and improving operator safety. |
Source Your PTO Shaft Yokes Directly – Get a Quote Today
Whether you need a single replacement end yoke or a container-load for distribution, we supply forged 1045C PTO shaft yokes with full dimensional inspection and batch traceability. Volume pricing starts at 20 pieces, with OEM customization available above 100 units.
Tell us your spline size, series, and quantity — our driveline engineering team will confirm fit and deliver a formal quotation within 24 hours. Standard production lead time is 10–18 business days.
OEM & ODM Orders Welcome • ISO 9001 Certified • Shipped to 60+ Countries • Batch Inspection Reports Included
