Arbre de prise de force en forme de citron | Composant de transmission agricole

Présentation du produit

Cut a lemon in half crosswise and look at the shape. Two rounded lobes meeting at pointed ends. That's exactly the cross-section of the Arbre de prise de force en forme de citron tube profile, and the shape isn't decorative; it's functional. The two-lobe geometry gives this farm driveline component a wider angular tolerance at the telescoping joint compared to a triangular profile, while still providing reliable torque transfer through face contact between the inner and outer tubes.

The Lemon-Shaped PTO Shaft for Agricultural Equipment is one of our most popular models among Korean operators running mid-range tractors (20 to 70 HP) on implements that require moderate angular flexibility during operation. Disc mowers, rotary rakes, fertilizer spreaders, and light-duty rotary tillers are the typical use cases. The profile also shows up frequently on Japanese-brand compact tractors from Kubota, Yanmar, and Iseki.

 

What Makes Lemon Different from Triangular?

Both profiles do the same job: lock the inner tube to the outer tube rotationally while allowing axial sliding. The difference is in the contact geometry. A Lemon-Shaped PTO Shaft has curved surfaces that create a slight wedging action during torque transmission, which reduces stress concentration at the contact edges. The trade-off is marginally lower peak torque capacity per unit of tube diameter compared to a triangular or star profile. For most arbre de prise de force agricole applications under 70 HP, that trade-off is well worth it.

Spécifications techniques

Two specification tables follow. The first covers the main Lemon-Shaped PTO Shaft assembly parameters. The second provides detail on the lemon tube component materials and manufacturing.

Lemon Tube Component Specifications

Material Science Behind the Lemon-Shaped PTO Shaft

One detail that separates our Lemon-Shaped PTO Shaft for Agricultural Equipment from budget alternatives is the range of steel alloys used across different components. Each part of the assembly faces a different type of mechanical stress, and we select the alloy accordingly rather than using a single grade throughout.

Yoke: 40Cr Alloy Steel

The yokes bear the highest bending and torsional stress in the assembly. We forge them from 40Cr (equivalent to AISI 5140), which offers a good combination of tensile strength and impact toughness after quench-and-temper heat treatment. Surface hardness lands at HRC 28 to 32, hard enough to resist wear at the spline interface but not so hard that it becomes brittle under shock loads.

Lemon Tubes: C45 Carbon Steel

The telescoping tubes are cold-drawn from C45 (AISI 1045) medium-carbon steel. This grade balances machinability, weldability, and strength. Cold drawing improves the surface finish and dimensional accuracy beyond what hot-rolling can achieve, giving the Lemon-Shaped PTO Shaft its smooth telescoping action with minimal radial play between inner and outer tubes.

Custom Material Options

For applications with unusual stress requirements, we also offer 20CrMnTi (carburizing steel for case-hardened gears in integrated gearbox assemblies) and 42CrMo (high-strength alloy for extreme torque applications). These materials are available on custom order with a 15 to 20 day production lead time.

Maintenance and Wear Inspection

The Lemon-Shaped PTO Shaft for Agricultural Equipment requires the same basic lubrication schedule as other arbre de transmission de prise de force profiles, but the lemon tube's curved surfaces have one maintenance advantage: debris is less likely to pack into corners compared to triangular or star profiles. Here's how to keep it running season after season:

Lubrication Schedule

• ◔ Every 8 operating hours: grease both cross-bearing kits with NLGI #2 EP grease until fresh grease appears at all four seals per joint
• ◔ Every 50 hours: clean the lemon tube overlap zone, remove old grease and any packed soil, then re-grease the sliding surfaces
• ◔ Every 100 hours: check safety shield bearings for free rotation, inspect the plastic guards for cracks, tighten any loose chain anchors
• ◔ Off-season: full inspection of yoke pin bores, tube wall thickness at the overlap zone, cross-bearing play, and overall paint condition

Signs of Tube Wear

Excessive rocking or wobble at the telescoping joint when you grip the shaft and try to move it side-to-side. Difficulty extending or retracting the tubes smoothly. Visible scoring or galling on the lemon tube surfaces when you separate them. If any of these show up, the tubes have worn past their service limit and should be replaced as a pair.

Safety and Accident Prevention

PTO entanglement remains one of the leading causes of serious farm injuries in Korea. The Lemon-Shaped PTO Shaft for Agricultural Equipment ships with a full protection de prise de force set, but the shield only works if it's properly maintained and the operator follows safe work practices.

• ⚠ Keep both shield halves in place at all times during operation. A missing shield is never an acceptable shortcut.
• ⚠ Never reach into a running driveline to clear a jam. Shut down and lock out first.
• ⚠ Wear close-fitting clothing when working near PTO equipment. Loose fabric and long hair are entanglement hazards.
• ⚠ Replace cracked or broken safety shields immediately. We stock replacements for the Lemon-Shaped PTO Shaft at our Korea warehouse.

Produits complémentaires

Lemon Shaft and Gearbox Pairing

The Lemon-Shaped PTO Shaft delivers torque to the boîte de vitesses agricole on the implement. A disc mower gearbox, for instance, takes the 540 RPM PTO input and converts it to the blade speed the mowing mechanism requires. The lemon tube yoke spline must match the gearbox input shaft spline for a proper connection. Our team can cross-reference both components when you order to make sure the pairing is correct.

Spare Parts and Individual Components

Lemon tube pairs (inner + outer), cross-bearing kits, yokes in all attachment styles, safety shields, and locking pins are available individually. The lemon tubes are the most commonly replaced component after several seasons, since the curved surfaces gradually wear and develop play.

Why This Lemon-Shaped PTO Shaft Stands Out

• ❖ Multi-alloy construction: 40Cr yokes, C45 tubes, and optional 42CrMo for extreme applications
• ❖ OEM-standard lemon profile dimensions fit Kubota, Yanmar, Iseki, and all major tractor brands
• ❖ Cold-drawn tube surfaces for smooth telescoping and low vibration during field operation
• ❖ Full yoke selection: double push pin, bolt pin, split pin, quick release, ball attachment, collar
• ❖ CE, ISO, and TS certified manufacturing with material test reports available per batch
• ❖ Korean-speaking technical team confirms lemon shaft sizing and compatibility before each order ships
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Foire aux questions

What's the advantage of a lemon tube over a triangular tube in a farm driveline component?

The lemon profile's curved surfaces reduce stress concentration at contact edges, which can extend tube life in applications with frequent angular changes. It also tends to be easier to clean than a triangular profile because soil doesn't pack into sharp corners.

What HP range does the Lemon-Shaped PTO Shaft cover?

L1 series handles up to about 15 HP, L4 covers 30 to 40 HP, and L6 reaches approximately 60 HP. Beyond that, we recommend moving to the S-series with star or spline tubes for higher torque capacity.

Can I get this Lemon-Shaped PTO Shaft with a torque limiter pre-installed?

Yes. Friction clutch, shear bolt, and ratchet overrunning clutch options are all available as factory-installed add-ons. The limiter mounts on the implement end of the Lemon-Shaped PTO Shaft.

What material is used for the lemon tubes specifically?

Standard lemon tubes are C45 (AISI 1045) medium-carbon steel, cold drawn. For customers with unusual stress requirements, 40Cr and 42CrMo options are available on custom order.

How do I tell if my existing power take-off shaft has lemon tubes or triangular tubes?

Separate the inner tube from the outer and look at the cross-section. Lemon has two rounded lobes with pointed ends (like a lemon cut crosswise). Triangular has three distinct flat sides. If still unsure, send us a photo and we'll identify it immediately.

Does the Lemon-Shaped PTO Shaft for Agricultural Equipment fit both 540 and 1000 RPM PTO?

Yes. The tube profile doesn't affect PTO speed compatibility. Select the tractor-end yoke with the correct spline for your PTO speed (6-spline for 540 RPM, 21-spline for 1000 RPM in most cases).

Avis clients

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Kim Hyo-jin, Disc Mower Operator, Chungcheongnam-do (spring 2025)

"I switched from a triangular to this lemon profile shaft for my disc mower because the dealer recommended it for the slight angle I run at. He was right. Smoother operation and the tubes slide easier when I'm raising and lowering the mower. Eight months and counting without issues."

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Baek Seung-ho, Kubota Dealer, Gyeonggi-do (late 2024)

"Many Kubota compact tractors in this region originally came with lemon-profile shafts. When customers need replacements, this is what I sell them. Dimensions match the OEM parts exactly, and the price makes it a straightforward recommendation."

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Jang Mi-rae, Organic Vegetable Farm, Jeolla-do (early 2025)

"L3 lemon shaft on a 30 HP tractor running a fertilizer spreader. Very light duty application but the shaft quality is still high. The cold-drawn tubes feel machined-smooth when you slide them apart. Not something I expected at this price point."

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Kwon Dae-jung, Farm Equipment Repair, Daejeon (mid 2024)

"I've rebuilt and replaced hundreds of PTO shafts in my career. The lemon tubes on this shaft are well-finished with no rough spots that would accelerate wear. Cross-bearing seals look properly fitted. For a non-OEM shaft, the quality control is tight."

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Noh Yeon-su, Livestock Farmer, Gyeongsangbuk-do (fall 2024)

"Bought two Lemon-Shaped PTO Shafts for a hay tedder and a rotary rake. Both work as expected with no vibration or play. The safety shields spin freely and the yellow color is easy to spot. Decent product for the money."

Emballage et expédition