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L Series Lemon Tube PTO Shaft — L1 to L32
Tri-Lobe Heavy-Duty Driveline for Discbines & Ag Equipment
7 tri-lobe lemon-profile grades from L1 (12 kW / 320 Nm peak) to L6 (47 kW / 1,450 Nm peak) at 540 RPM. Thicker tube wall than standard round-spline shafts. Telescoping, quick-release, and overrunning clutch options available. CE certified.
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✔ Tri-Lobe Lemon Profile Tube
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✔ Thicker Wall Than Standard
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✔ 540 & 1000 RPM Rated
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✔ Telescoping / Quick-Release / Overrunning Clutch Options
What Is the L Series Lemon Tube PTO Shaft?
The L Series PTO shaft is a telescoping power take-off driveline built around a tri-lobe “lemon” tube profile — a three-lobed cross-section that physically cannot rotate inside its mating outer tube. Where round-spline designs rely purely on tooth engagement to prevent relative rotation, the lemon tube’s geometry locks the inner and outer tubes together mechanically through shape alone. This fundamentally eliminates rotational slip between tubes under torque reversals and shock loads.
The L Series tube wall is measurably thicker than standard-duty PTO shafts at the same outer diameter, adding torsional stiffness and impact resistance. This makes the L Series the correct choice for applications that combine high shock loads (rock strikes, slug feeding) with frequent extension-compression cycling — a combination that accelerates fatigue cracking in thinner-wall shafts within one or two seasons.
Seven grades — L1, L2, L3, L4, L5, L6, and L32 — span a continuous-duty range from 12 kW (L1) to 47 kW (L6) at 540 RPM, with peak torque (MP) reaching 1,450 Nm on the L6. Each grade is independently rated at both 540 and 1000 RPM, and all are available with optional telescoping, quick-release yokes, or overrunning clutch configurations to match your implement’s specific driveline requirements.
L Series Lemon Tube PTO Shaft — L1 to L32
The 4 Problems L Series Lemon Tube Shafts Are Engineered to Fix
Most PTO shaft failures trace back to the same root causes. Here’s how the L Series tri-lobe design addresses each one directly:
Round-spline tubes develop backlash after extended use. Under torque reversal — common in balers, rotary cutters, and any implement that cycles between power-on and coast — the tubes knock against each other, accelerating spline wear.
Standard-wall PTO tubes fail at the tube-to-yoke weld zone when subject to repeated rock strikes or slug-fed balers that create instantaneous torque spikes 3–5× the rated running load. Wall fatigue cracks propagate from these weld heat-affected zones.
Buyers routinely undersize PTO shafts because the shaft appears to “work” initially — then fails at season peak. Oversizing adds unnecessary weight and cost. Without a clear torque-to-horsepower matching table, buyers guess and get it wrong.
Implements with high rotational inertia (flywheels, rotary cutters) continue spinning after the tractor PTO is disengaged. Without an overrunning clutch, this reverse-drives the tractor gearbox, causing internal gear failures that are expensive and non-obvious until catastrophic.
L Series Lemon PTO Shaft — Power & Torque Specifications
Match your tractor’s PTO output horsepower to the correct L Series grade. Always use your tractor’s actual PTO-shaft horsepower — not engine horsepower, which is typically 15–20% higher. If you regularly hit slug loads or rock strikes, select the next grade up from your calculated match.
Measure closed length tip-to-tip (outside of each yoke) with shaft fully compressed before ordering a specific length.
| Series | @ 540 RPM | @ 1000 RPM | Peak Torque MP (Nm) | ||||
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| kW | hp | Nm | kW | hp | Nm | ||
| L1 | 12 | 16 | 210 | 18 | 25 | 172 | 320 |
| L2 | 15 | 21 | 270 | 23 | 31 | 220 | 450 |
| L3 | 22 | 30 | 390 | 35 | 47 | 330 | 640 |
| L4 | 26 | 35 | 460 | 40 | 55 | 380 | 780 |
| L5 | 35 | 47 | 970 | 54 | 74 | 520 | 1,050 |
| L6 | 47 | 64 | 830 | 74 | 100 | 710 | 1,450 |
| L32 | 39 | 53 | 695 | 61 | 83 | 580 | 1,200 |
* MP = peak torque (Nm) for short-duration shock loads only. Continuous-duty ratings are the kW and Nm columns. L32 sits between L5 and L6 in power output and is distinguished by a different cross kit and yoke bore standard — not interchangeable with L5 or L6 components.
Where L Series Lemon Tube PTO Shafts Are Specified
The L Series tri-lobe profile is specified by OEM implement manufacturers and aftermarket buyers wherever the combination of shock loading, frequent stroke cycling, and compact installation space rules out thinner-wall alternatives:
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Frequently Asked Questions — L Series Lemon PTO Shaft
What Customers Say About the L Series PTO Shaft
“We transitioned our discbine production line from S Series to L Series shafts two seasons ago after tube wear data showed the lemon profile extending average tube replacement intervals from 380 to 620 operating hours. That’s a 63% improvement in consumable life — significant when multiplied across a 600-unit annual production run. Cross kit quality is consistent; our incoming inspection on a 5% sample batch hasn’t flagged a dimensional non-conformance in 14 consecutive shipments.”
“My old PTO shaft had more slop in it than my brother-in-law’s handshake. Every time I engaged the PTO it sounded like someone dropped a toolbox down a staircase. Switched to the L4 lemon tube and the thing is silent — just a smooth hum. My wife asked why the tractor sounds different. I said ‘new shaft.’ She said ‘how much?’ I said ‘less than what the gearbox repair would’ve cost.’ She hasn’t asked again. Five stars.”
“We run a 22-tractor custom hay cutting operation in central Queensland. Our operators aren’t always gentle with equipment — PTO shafts take abuse from wide-open throttle engagement, hitting the hitch hard, and working through dried-out native pasture with hidden rocks. We’ve been running L6 shafts for a full season across 8 machines — 1,800 combined cutting hours — with zero tube failures and two cross kit replacements. That’s a significant improvement on what we had before. The overrunning clutch option was what sold us; we disengage PTO frequently on contour work.”
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