विवरण
Drive Shaft Yoke – Forged PTO Yoke for Tractor & Farm Implements
Forged Steel Construction | 6 / 21 / 20-Spline Options | Quick-Disconnect & Clamp Variants | 540 & 1000 RPM Compatible
Product Overview
A drive shaft yoke is the forked steel connector at each end of a PTO driveline that transfers rotational force between the tractor’s power take-off output and the implement’s input shaft. It works in tandem with a cross-and-bearing kit (universal joint) to permit angular misalignment while maintaining continuous torque delivery at 540 or 1000 RPM. Without a correctly sized yoke, the entire driveline cannot engage — no mowing, no baling, no tilling.
Our drive shaft yokes are drop-forged from medium-carbon steel (AISI 1045, tensile strength 570–700 MPa), then machined to tight spline tolerances. They are available in all three standard North American PTO driveline components configurations: 1 3/8″ 6-spline (Type 1, 540 RPM), 1 3/8″ 21-spline (Type 2, 1000 RPM), and 1 3/4″ 20-spline (Type 3, 1000 RPM). Metric profile yokes for Bondioli & Pavesi, Walterscheid, and other European-series shafts are also stocked.
Each yoke ships as a brand-new, OEM-grade replacement with a corrosion-resistant finish and factory-drilled grease port. Whether you need a tractor-end quick-disconnect yoke, an implement-end clamp yoke, or a spline adapter sleeve to bridge mismatched shaft sizes, this product line covers the full range of agricultural driveline connections.
Technical Specifications
| Material | AISI 1045 forged medium-carbon steel (570–700 MPa tensile) |
| Available Spline Configurations | 1 3/8″ 6-spline (Z6) | 1 3/8″ 21-spline (Z21) | 1 3/4″ 20-spline (Z20) |
| PTO Speed Compatibility | 540 RPM (Type 1) & 1000 RPM (Type 2 / Type 3) |
| Yoke Types Available | Quick-disconnect (push-pin), clamp bolt, ball-lock, shear-pin, tube weld |
| Series Coverage | Series 1 through Series 8 (North American & metric profiles) |
| Surface Treatment | Yellow zinc or black oxide anti-corrosion coating |
| Lubrication | Pre-drilled zerk fitting for grease gun access |
| Standards Compliance | ANSI/ASABE AD5673, ANSI/ASABE AD5674, EN 12965 |
| Condition | Brand New – OEM-grade replacement |
Product Gallery
Features of Agricultural Power Drive Shaft Yoke
When selecting a universal joint drive shaft yoke for farming implements, six engineering and design features separate a reliable part from a premature failure:
- Tractor & Implement Yoke Variants. Tractor-end yokes have internal splines that mate directly with the tractor’s PTO output stub. Implement-end yokes attach to the equipment’s input shaft and are often specific to the implement series. Matching the correct end type prevents axial play and ensures full spline engagement across the contact surface.
- Multi-Spline Compatibility. Available in 6-spline (540 RPM), 21-spline (1000 RPM economy), and 20-spline (1000 RPM standard) bore configurations. The spline count and pitch diameter must match the tractor’s PTO stub exactly — a 6-spline yoke will not seat on a 21-spline shaft. This is the single most common sizing error in PTO driveline components replacement.
- Forged Steel Construction. Each yoke is drop-forged rather than cast. Forging aligns the steel’s grain flow along the load path through the yoke ears, which increases fatigue strength by 30–40% compared to castings of the same geometry. The result is a component rated for high-cycle rotational stress at 540 or 1000 RPM without developing stress cracks in the cross-hole area.
- Quick-Release Locking Systems. Tractor yokes are supplied with push-pin quick-disconnect, spring-lock, ball-lock, or auto-lock retention mechanisms. Push-pin types allow tool-free attachment and detachment in under 5 seconds — a measurable time saving when operators switch between multiple implements daily.
- Safety Shield Compatibility. Every yoke is dimensioned to accept standard plastic PTO safety shields with shield bearings. These guards are not optional — exposed rotating shafts cause an estimated 1,200+ agricultural entanglement injuries annually in the U.S. alone. The yoke profile ensures the shield clears the ears without binding.
- Cross-Series Interchangeability. Yokes follow ANSI/ASABE dimensional standards, making them interchangeable with OEM components from major driveline manufacturers. This avoids single-supplier lock-in and simplifies parts stocking for dealers and farm shops maintaining mixed fleets.
Applications of Drive Shaft Yoke
The drive shaft yoke is the load-bearing link between tractor power and implement function. Every PTO-driven machine listed below depends on a correctly specified yoke to operate:
- Rotary Mowers & Brush Cutters. Finish mowers, flail mowers, and heavy brush cutters connect to the tractor through a drive shaft yoke paired with a cross-and-bearing universal joint. At 540 RPM continuous cutting, the yoke absorbs torsional vibration generated by blade impact on uneven ground cover and embedded debris.
- Balers, Rakes & Tedders. Round balers generate cyclic compression loads that spike 2–3× above steady torque during each bale wrap. Hay rakes and tedders run at lower torque but require smooth, vibration-free rotation to avoid tangling crop rows. A forged yoke handles both patterns without developing fatigue cracks.
- Tillage Equipment. Plows, disc harrows, rotary tillers, and power harrows demand sustained high torque for soil engagement. The drive shaft yoke absorbs sudden shock loads when blades strike rocks or compacted subsoil, protecting the gearbox and driveline tube from damage that would otherwise require a full shaft replacement.
- Spreaders & Distributors. Fertilizer spreaders, manure spreaders, and lime distributors use PTO-driven agitators or spinner mechanisms. Because spreader environments involve corrosive chemicals and wet organic material, the yellow-zinc surface treatment on this yoke provides measurable corrosion resistance compared to bare-steel alternatives.
- Grain Augers & Conveyors. Grain handling equipment transfers bulk material at volume. A universal joint drive shaft yoke for farming implements in this category must deliver vibration-free rotation to prevent grain spillage at transfer points and reduce wear on auger bearings.
- Sprayers & Pump Drives. Boom sprayers and tractor-mounted spray rigs rely on PTO-driven pumps for consistent pressure. Even a 2–3% variation in shaft RPM caused by a worn yoke can produce visible spray-pattern inconsistency, wasting chemical product and reducing field coverage uniformity.
Beyond agriculture, these yokes serve in PTO-powered wood chippers, post-hole diggers, snow blowers, stump grinders, and trailer-mounted generators.
Maintenance Guide: Extending Drive Shaft Yoke Service Life
Most yoke failures trace back to two preventable causes: insufficient lubrication and ignored wear indicators. The schedule below addresses both:
Every 8 Operating Hours – Grease.
Pump NLGI #2 lithium-complex grease into every zerk fitting on the yoke and universal joint until fresh lubricant purges from each U-joint cap seal. For telescoping shafts, fully extend the tube, grease the inner splines, then retract to distribute the lubricant. Wipe off excess — over-greasing creates hydraulic lock inside the U-joint caps and can push seals out of position.
Every 50 Operating Hours – Inspect Splines & Cross-Holes.
Disconnect the PTO shaft, clean the yoke with a degreaser, and examine the internal spline teeth for ridging, pitting, or asymmetric wear. Check the cross-holes for elongation (oval shape instead of round). If axial play at the spline interface exceeds 0.5 mm, or if the retaining pin no longer clicks into its detent with firm resistance, replace the yoke.
Every 200 Hours or Start of Season – Full Driveline Review.
Sight along the shaft axis to verify both yokes form a parallel “H” alignment. A twisted pattern means one yoke has been reinstalled out of phase on the splines — this causes oscillating torque that accelerates U-joint bearing wear. Test the telescoping tube for smooth slide action: if binding occurs, polish the tube lightly with emery cloth and re-grease. Replace any universal joint that clicks or binds during hand rotation.
Off-Season Storage.
Clean all surfaces, apply a fresh coat of grease to exposed splines and the cross-hole area, and store the shaft horizontally in a dry location. Keep the telescoping tube fully retracted to prevent moisture ingress between the inner and outer profiles.
अक्सर पूछे जाने वाले प्रश्नों
1. How do I identify the correct drive shaft yoke for my tractor?
Count the spline grooves inside the yoke collar: 6 splines = Type 1 (540 RPM), 21 splines = Type 2 (1000 RPM), 20 splines = Type 3 (1000 RPM). Then measure the bore diameter and match it to the series number of your existing driveline.
2. What is the difference between a tractor yoke and an implement yoke?
The tractor yoke has internal splines that slide onto the tractor’s PTO output stub and uses a quick-release pin for fast detachment. The implement yoke connects to the equipment’s input shaft and typically uses a clamp bolt, shear pin, or keyway for a fixed, secure hold.
3. Can I use a 6-spline yoke on a 1000 RPM PTO?
No. The 1000 RPM standard uses 21-spline or 20-spline stubs. A 6-spline yoke will not physically engage a 21-spline shaft. Installing a mismatched yoke risks immediate disengagement under load and potential equipment damage.
4. Do you offer a spline adapter sleeve if my yoke and shaft don’t match?
Yes. We stock spline adapter sleeves that bridge common mismatches (e.g., 6-spline to 21-spline, 1 3/8″ to 1 3/4″). Each adapter is rated for the same torque class as the corresponding series yoke. Contact us with both spline specs for a recommendation.
5. What causes a drive shaft yoke to fail prematurely?
The top three causes are: inadequate lubrication (accounts for roughly 34% of field failures), spline mismatch causing uneven load distribution, and missing or damaged retaining pins allowing axial movement. Regular 8-hour greasing and pre-season inspection prevent the majority of failures.
What Our Customers Say
★★★★★ — Brian K., Alberta, Canada
“I manage 800 acres of mixed grain and run a Claas baler, a JD rotary cutter, and a Kuhn tedder — three implements that each need a tractor-end yoke swapped multiple times per week. Ordered three quick-disconnect yokes, and the push-pin engagement is tighter than the OEM Weasler ones I replaced. Spline fit was spot-on, no slop, no filing. We’re past 600 hours on the first pair and zero grease seal failures so far.”
★★★★☆ — Carlos M., Jalisco, Mexico
“My old yoke had so much play in it the PTO shaft sounded like a washing machine full of wrenches. Installed this one and suddenly my rotary tiller is whispering instead of screaming. My neighbor came over to ask what tractor I bought — I told him it’s the same one, just with a yoke that actually fits. He didn’t believe me. Now he’s ordered two. I should be getting a referral commission.”
Recommended Companion Parts
A drive shaft yoke is one component in a multi-part driveline assembly. Pairing it with matched parts ensures the entire system reaches its rated service life:
| Component | Role in the Driveline |
|---|---|
| Universal Joint (Cross & Bearing Kit) | Connects two yokes and allows angular misalignment up to 25° on standard joints (50° on wide-angle / CV joints). Must match the series cross dimensions. |
| PTO Telescoping Tubing (Inner & Outer) | The sliding shaft body that adjusts driveline length. Available in triangular, lemon, star, square, and spline profiles depending on series and region. |
| Spline Adapter Sleeve | Bridges spline mismatches between yoke and shaft (e.g., 6-spline to 21-spline). Rated to the same torque class as the parent series. |
| Safety Shield & Shield Bearing | Plastic guard and bearing set that covers the rotating shaft. Prevents operator entanglement and meets ASABE safety standards. |
| Torque Limiter (Shear Bolt / Slip Clutch) | Disconnects or slips the driveline when torque exceeds a set threshold, preventing yoke and gearbox damage during overload events. |
| Overrunning Coupler (Freewheel) | Prevents implement inertia from back-driving the tractor PTO when the shaft is disengaged, protecting the transmission. |
Find the Right Drive Shaft Yoke for Your Equipment
We stock tractor yokes, implement yokes, tube-weld yokes, and spline adapter sleeves across Series 1–8 in both North American and metric profiles. Volume pricing applies from 20 units, with OEM branding available on orders above 100 pieces. Every shipment includes dimensional inspection data.
Send us your spline size, series number, and quantity — our driveline team will confirm compatibility and return a formal quotation within 24 hours. Standard lead time is 10–18 business days for stocked series.
OEM & ODM Orders Welcome • ISO 9001 Certified • Shipped to 60+ Countries • ANSI/ASABE Compliant
