Description
L Series PTO Drive Shaft – Lemon Profile Design for Smooth, Efficient Power Delivery
The L Series PTO drive shaft employs a lemon-shaped (elliptical) tube profile that provides a larger contact surface between inner and outer tubes than conventional round profiles, resulting in lower surface pressure and extended tube life. Spanning models L1 to L6 and L32, this series covers torque demands from 320 Nm to 1,200 Nm and is optimized for light-to-medium-duty farm implements driven by compact and utility tractors.
Industry applications: Arable farming, grassland management, orchard maintenance, horticultural operations, and municipal landscaping.
Why choose the L Series? Lemon tube geometry reduces rotational mass · Quieter operation at higher RPMs · Lower friction during telescopic extension · Full compatibility with standard 6-spline and 21-spline PTO outputs.
L Series Technical Data Sheet
| Model | Cross Size (mm) | 540 RPM – Kw | 540 RPM – Pk | 540 RPM – Nm | 1000 RPM – Kw | 1000 RPM – Pk | 1000 RPM – Nm | MP (NM) |
|---|---|---|---|---|---|---|---|---|
| L1 | 22×54 | 12 | 16 | 210 | 18 | 25 | 172 | 320 |
| L2 | 23.8×61.3 | 15 | 21 | 270 | 23 | 31 | 220 | 450 |
| L3 | 27×70 | 22 | 30 | 390 | 35 | 47 | 330 | 640 |
| L4 | 27×74.6 | 26 | 35 | 460 | 40 | 55 | 380 | 780 |
| L5 | 30.2×80 | 35 | 47 | 970 | 54 | 74 | 520 | 1050 |
| L6 | 30.2×92 | 47 | 64 | 830 | 74 | 100 | 710 | 1450 |
| L32 | 32×76 | 39 | 53 | 695 | 61 | 83 | 580 | 1200 |
Operating Principle of the Lemon-Profile PTO Shaft
The L Series operates on the same cardan joint principle as all agricultural PTO shafts, but its defining characteristic is the lemon-shaped cross-section of the telescopic tubes. Unlike triangular or star profiles, the lemon shape distributes torque loads across two broad, opposing contact arcs. This geometry produces lower peak contact stress, which translates into reduced wear, less heat generation during telescoping, and noticeably quieter operation — a meaningful benefit when running implements for extended periods in grassland or orchard settings.
Assembly breakdown: Tractor-end forged yoke · Lemon-profile outer tube with welded yoke · Lemon-profile inner tube with welded yoke · Implement-end yoke · Two cross kits with sealed needle bearings · Full-length polypropylene safety shield set · Retaining chains and spring pins.
Why the L Series Stands Out – Key Benefits
Lower Rotational Inertia
The lemon profile carries less material per unit length than triangular tubes, reducing parasitic power loss — especially valuable on sub-60 HP tractors.
Quieter Running
Broad elliptical contact patches dampen vibration harmonics, producing noticeably less noise than angular tube profiles at 1,000 RPM.
Extended Tube Life
Distributed surface pressure across the lemon profile reduces localized wear, extending replacement intervals by up to 30% versus triangular tubes of equivalent size.
Compact & Lightweight
Ideal for orchard and vineyard tractors where clearance is limited and every kilogram of rotating mass counts.
Sealed Bearings
Cross kit bearing cups are factory-sealed and pre-packed with high-temperature grease, resisting dust and moisture ingress in the field.
Materials & Manufacturing Process
L Series tubes are precision-drawn from AISI 1045 medium-carbon steel through custom lemon-profile dies, maintaining wall-thickness tolerances within ±0.15 mm. Outer and inner tubes are matched in sets and individually numbered to ensure consistent sliding fit. Yokes are closed-die forged from 42CrMo4 chromium-molybdenum steel, machined on CNC lathes, and induction-hardened at spline and bearing bore surfaces to HRC 56–60. All exposed steel surfaces receive a trivalent chromium passivation finish (RoHS-compliant) for corrosion resistance without hexavalent chromium. Safety shields are molded from UV-stabilized polypropylene to maintain integrity under prolonged sun exposure.
Where the L Series Excels – Application Scenarios
| Scenario | Suggested Model | Operating Notes |
|---|---|---|
| Finishing Mower (Parkland) | L1 – L2 | Low-torque, high-RPM application; lemon profile minimizes vibration on manicured turf. |
| Hay Tedder / Rake | L2 – L4 | Frequent extension/retraction during turning; smooth lemon telescoping reduces judder. |
| Seed Drill | L3 – L5 | Steady moderate torque drives metering mechanisms; compact profile clears drill frame. |
| Orchard Sprayer | L2 – L3 | Narrow row spacing demands a slim PTO shaft; L Series fits within tight canopy gaps. |
| Small Grain Auger | L4 – L6 | Incline angle varies; two cardan joints absorb misalignment while lemon tubes slide freely. |
| Vineyard Inter-Row Cultivator | L1 – L3 | Compact tractor <50 HP; lightweight L Series avoids overloading PTO output bearing. |
How to Select the Correct L Series PTO Shaft
Follow these six steps to match the L Series shaft to your tractor-implement combination:
- Determine implement power requirement (kW or HP): Find this on the implement nameplate or operator manual. Convert HP to kW (1 HP ≈ 0.746 kW) if needed.
- Identify PTO speed: Most implements specify 540 or 1,000 RPM. Cross-reference with the L Series torque table above.
- Measure installation distance: Record the minimum (closed) and maximum (open) distances between PTO stub and implement input shaft. Ensure the shaft’s stroke covers this range with at least one-third tube overlap.
- Verify spline specification: Common standards include 1-3/8" 6-spline (540 RPM) and 1-3/8" 21-spline (1,000 RPM). The implement side may use a different profile — specify both ends when ordering.
- Assess operating environment: For dusty or wet conditions, consider ordering shafts with additional sealing on the spline connection.
- Safety compliance: Confirm your region’s requirements. CE shields are standard; additional guarding may be needed for certain applications.
For complex configurations, our application engineers can prepare a detailed sizing report. Get in touch here.
Cross-Brand Replacement Compatibility
The L Series is designed as a drop-in aftermarket replacement for lemon-profile PTO shafts produced by established European driveline manufacturers, including:
- Walterscheid – LG series lemon-profile shafts
- Bondioli & Pavesi – Series with lemon tube profiles
- Comer Industries – Lemon tube drivelines
- AW (Agrostroj Welger) – Light-duty PTO shaft range
Note: Brand names listed above are trademarks of their respective holders and appear here only to assist buyers in identifying compatible replacement parts. No affiliation or endorsement is implied.
Individual replacement components — cross kits, lemon tubes, yokes, shields — are stocked separately. Explore the PTO Parts catalog for part numbers.
Certifications & After-Sales Promise
ISO 9001:2015
Manufactured in an ISO-certified facility with full traceability on raw materials and heat-treatment records.
CE Certified
Safety shields and complete assemblies meet EU Machinery Directive requirements.
12-Month Warranty
Covers material and workmanship defects. Claims processed within 5 business days.
Common Questions About the L Series PTO Shaft
What makes lemon profile different from triangular profile?
The lemon (elliptical) cross-section has two broad contact arcs rather than three narrow edges. This distributes torque loads more evenly, reduces contact pressure, and provides smoother telescopic sliding — ideal for applications requiring frequent shaft extension and retraction.
Can I upgrade from a triangular PTO shaft to a lemon profile?
Yes, provided the torque rating of the chosen L Series model meets or exceeds your implement’s requirement. The yoke connections (spline and cross kit) are interchangeable; only the tube profile differs.
Is the L Series suitable for heavy-duty balers?
The L Series is optimized for light-to-medium duty applications up to 1,200 Nm. For heavy-duty balers requiring higher torque, consider the S Series or G Series PTO shafts, which offer ratings up to 3,700 Nm.
Are L Series tubes interchangeable with T Series tubes?
No. Lemon-profile tubes are not compatible with triangular-profile tubes. However, the yokes and cross kits use the same standard dimensions and are interchangeable within the same size class.
What lubrication schedule should I follow?
Grease all cross kit zerk fittings and the splined telescopic joint every 8 hours of operation. Apply a thin film of grease to the outer surface of the inner tube before first assembly to ensure free sliding.
Customer Experiences From Around the World
“Switched to L4 shafts on our hay tedders last spring. The lemon tube slides much more freely than the old triangular ones, and there’s a noticeable drop in vibration at the tractor seat.” — Owner-operator, mixed livestock and cropping
“L3 shafts on our seed drills have survived two seasons of paddock work without a single issue. Great bang for the buck.” — Farm manager, arable operation
“We needed a lemon-profile replacement for an old Walterscheid shaft on our mower-conditioner. The L5 was a bolt-on swap — dimensions matched perfectly.” — Arable contractor
“Running L2 shafts on small grain augers. They’re light enough not to stress the auger’s input bearing but strong enough for continuous 540-RPM duty.” — Grain farmer
“As a dealer, we appreciate the consistent quality and fast turnaround. The L Series fills our catalog gap for economy lemon-profile shafts without compromising on safety certification.” — Agricultural machinery dealer
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