PTO Shaft Friction Torque Limiter – FFVT Series (Belleville Spring, V-Type)

Der FFVT Series Friction Torque Limiter integrates Belleville spring technology with a V-type yoke design for PTO shaft torque protection at 900–2000 Nm. The Belleville disc springs deliver consistent clamping force on friction discs regardless of temperature fluctuations, providing stable and repeatable torque limiting in demanding field conditions. The V-type yoke housing offers alternative mounting geometry for specific implement interface requirements. Φ140 to Φ160 friction disc options with multiple spline configurations. Belleville spring precision, V-type mounting flexibility, Und stable torque control across temperatures define this advanced friction limiter series.

Beschreibung

PTO Shaft Friction Torque Limiter – FFVT Series (Belleville Spring, V-Type)

Friction Torque Limiter for PTO shaft - 4FFVT1 series

Der PTO Shaft Friction Torque Limiter – FFVT Series (Belleville Spring, V-Type) ist von Premiumqualität Reibungsmomentbegrenzer Speziell entwickelt für Zapfwellenantriebe (PTO), die in Land-, Industrie- und Forstmaschinen eingesetzt werden. Auch bekannt als Zapfwellen-Rutschkupplung, Sicherheitskupplung der Zapfwelle, oder Überlastschutz für TraktorzapfwelleDieses Gerät schützt Ihre teuren Anlagen vor Schäden durch plötzliche Drehmomentüberlastungen, Blockaden und Betriebsstörungen.

Verfügbare Modelle: 4FFVT1, 4FFVT1D, 5FFVT1, 5FFVT1D, 6FFVT1, 6FFVT1D, 5FFVT1, 5FFVT1D, 6FFVT1, 6FFVT1D, 4FFVT2, 4FFVT2D, 5FFVT2, 5FFVT2D, 6FFVT2, 6FFVT2D, 6FFVT2C, 6FFVT2E, 7FFVT2, 7FFVT2D, 7FFVT2C, 7FFVT2E, 8FFVT2, 8FFVT2D, 8FFVT2C, 8FFVT2E, 6FFVT4, 6FFVT4D, 6FFVT4C, 6FFVT4E, 7FFVT4, 7FFVT4D, 7FFVT4C, 7FFVT4E, 7NFFVT4, 7NFFVT4D, 7NFFVT4C, 7NFFVT4E, 8FFVT4, 8FFVT4D, 8FFVT4C, 8FFVT4E

Drehmomentbereich: Drehmoment: 900–2000 Nm

Spline-Optionen: 1 3/8″ Z6, 1 3/8″ Z21, 1 3/4″ Z6, 1 3/4″ Z20

Hauptkomponenten: Belleville spring, Pressure plate, Friction discs (Qty.=2), Hub, Complete bolt (Qty.=2), Bushing, Flanged yoke, Complete bolt (Qty.=8)

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Technische Daten und Abmessungen

Serie Maximales Drehmoment (Nm) Reibscheibe Spline A (mm) B (mm) C (mm)
4FFVT1 900 Φ140 1 3/8″Z6 150 29 Φ180
5FFVT1 900 Φ140 1 3/8″Z6 152 29 Φ180
6FFVT1 900 Φ140 1 3/8″Z6 160 29 Φ180
4FFVT2 1200 Φ160 1 3/8″Z6 143 29 Φ200
5FFVT2 1200 Φ160 1 3/8″Z6 145 29 Φ200
6FFVT2 1200 Φ160 1 3/8″Z6 153 29 Φ200
7FFVT2 1200 Φ160 1 3/8″Z6 162 29 Φ200
8FFVT2 1200 Φ160 1 3/8″Z6 162 29 Φ200
6FFVT4 1600 Φ160 1 3/8″Z6 175 29 Φ200
7FFVT4 2000 Φ160 1 3/8″Z6 182 29 Φ200
7NFFVT4 2000 Φ160 1 3/8″Z6 175 29 Φ200
8FFVT4 2000 Φ160 1 3/8″Z6 182 29 Φ200

Alle Maße in Millimetern. Drehmomentwerte in Newtonmetern (Nm). Die Keilwellenspezifikationen entsprechen den ISO/ASAE-Normen. Für kundenspezifische Konfigurationen kontaktieren Sie uns bitte.

PTO shaft torque limiter Friction Torque Limiter technical drawing and assembly

Hauptmerkmale und Vorteile

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Einfache Wartung und Instandhaltung

Die einfache modulare Bauweise ermöglicht schnelle Servicearbeiten vor Ort mit Standardwerkzeugen. Ersatzteile sind problemlos erhältlich und kostengünstig.

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Materialien in Industriequalität

Präzisionsgefertigt aus gehärtetem legiertem Stahl mit wärmebehandelten kritischen Oberflächen für maximale Haltbarkeit und Lebensdauer.

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Universelle Nebenantriebskompatibilität

Die standardmäßige 1 3/8″ Z6-Keilwellenaufnahme passt ohne Adapter oder Modifikationen auf alle gängigen Zapfwellen von Traktoren und Anbaugeräten.

Sealed & Protected Design

Grease-lubricated internals with dust seals protect against contamination in harsh agricultural environments.

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Wide Torque Selection Range

Available in multiple torque ratings (900–2000 Nm) to match virtually any PTO-driven implement requirement.

Safety Certified

Manufactured under ISO 9001:2015 quality management with CE marking for European and international compliance.

Funktionsweise – Funktionsprinzip

Dieser Reibungsdrehmomentbegrenzer verwendet Tellerfedern (kegelförmige Federscheiben) anstelle herkömmlicher Schraubenfedern, um die Reibscheiben gegen die Nabe zu pressen. Tellerfedern bieten mehrere entscheidende Vorteile: Sie gewährleisten eine gleichbleibende Klemmkraft über einen weiten Temperaturbereich, haben ein kompaktes axiales Profil und können in Reihe oder parallel geschaltet werden, um präzise Federraten und Vorspannungseigenschaften zu erzielen. Sobald das Drehmoment die durch die Tellerfedervorspannung eingestellte Reibungskapazität überschreitet, beginnen die Scheiben progressiv zu rutschen und absorbieren überschüssige Energie ohne abruptes Trennen. Die Drehmomenteinstellung erfolgt durch Verändern der Schraubenspannung am Federpaket. Diese Konstruktion bietet eine engere Drehmomenttoleranz und eine wiederholgenauere Leistung als Reibungsbegrenzer mit Schraubenfedern.

Zurücksetzen-Methode: Automatisch – kontinuierliches Durchrutschen und Wiedereinrasten

Am besten geeignet für: Präzisionsanwendungen, die geringe Drehmomenttoleranz, Temperaturstabilität und kompakte Einbaulänge erfordern

Typische Anwendungsszenarien in der Landwirtschaft

Rotationsmäher und Schlegelmäher

Schützt das Getriebe des Mähwerks vor Beschädigungen, wenn die Messer auf versteckte Steine, Baumstümpfe oder Metallteile treffen. Der Drehmomentbegrenzer absorbiert die Stoßbelastung und verhindert, dass sie die Zapfwelle des Traktors erreicht.

Heuballenpressen & Rundballenpressen

Verhindert Schäden am Ballenpressmechanismus bei der Zuführung von Pressgut, bei Fehlern in der Garnwicklung oder beim Eindringen von Fremdkörpern, indem der Antriebsstrang getrennt wird, bevor schädliche Drehmomentwerte erreicht werden.

Rotationsfräsen und Kultivatoren

Schützt das Getriebe der Bodenfräse und die Zapfwelle des Traktors, wenn die Zinken auf vergrabene Steine, Wurzeln oder verdichtete Bodenschichten treffen, die extreme Drehmomentspitzen erzeugen können.

Manure Spreaders

Protects the beater mechanism and gearbox from overload when encountering frozen clumps, foreign objects, or uneven material distribution in the hopper.

Feed Mixers & TMR Wagons

Safeguards the mixer auger drive from damage caused by twine wrap, frozen feed blocks, or excessive loading that generates torque beyond design limits.

PTO shaft torque limiter in agricultural tractor application

Vergleich der Drehmomentbegrenzer-Typen

Besonderheit Kugelarretierung Reibscheibe Scherbolzen Sperrklinke Automatik (Nockenwelle)
Drehmomentbereich Niedrig bis mittel Mittel bis hoch Niedrig bis sehr hoch Niedrig–Hoch Mittel bis hoch
Geschwindigkeitsbereich 540–1000 U/min 540–1000 U/min 540–1000 U/min 540–1000 U/min 540–1000 U/min
Reset-Methode Automatisch Automatik (Schlupf) Anleitung (Schraube ersetzen) Automatisch (Ratsche) Automatisch (Nockenwelle)
Beste Anwendung Leichte Geräte Häufige, mäßige Überlastungen Seltene schwere Überlastungen Häufige kurzzeitige Überlastungen Hohe Auslastung, keine Verbrauchsmaterialien
Verbrauchsmaterialien Keiner Friction linings (long life) Shear bolts Keiner Keiner
Torque Precision Moderate Good (adjustable) Excellent (bolt-grade calibrated) Good Very Good (adjustable)

Installation & Usage Guide

Installation Steps

Step 1: Verify that the PTO shaft spline size matches the torque limiter spline specification (1 3/8″ Z6, 1 3/8″ Z21, 1 3/4″ Z6, 1 3/4″ Z20). Clean all spline surfaces thoroughly.

Step 2: Slide the torque limiter onto the PTO shaft spline, ensuring full engagement. Secure with the provided push pin kit or retaining hardware.

Step 3: Connect the output side (yoke or splined shaft) to the implement input shaft or gearbox. Ensure proper alignment and secure all fasteners to the recommended torque.

Step 4: Apply grease through the grease nipple to lubricate the spline interface and internal components. Use lithium-based EP grease (NLGI #2).

Step 5: Perform a low-speed test run to verify correct engagement and smooth operation before full-power operation.

Safety & Maintenance Tips

⚠ Always disengage the tractor PTO before inspecting or servicing the torque limiter.

⚠ Use only genuine replacement parts specified for your series to maintain the correct torque rating.

⚠ Re-grease spline connections every 8 operating hours or as specified in your equipment manual.

⚠ Inspect for wear, cracks, or damage before each season. Replace worn components immediately.

⚠ Never operate with damaged or missing PTO shaft safety shields.

Selection Guide — Choosing the Right Model

Selecting the correct torque limiter requires confirming the following parameters:

✓ Required Torque Rating (Nm): Match the implement’s maximum operating torque plus a 20–30% safety margin.

✓ PTO Shaft Spline Size: Commonly 1 3/8″ Z6 (6-spline) or 1 3/4″ Z6/Z20. Verify both input and output spline requirements.

✓ PTO Speed: Standard 540 RPM or economy 1000 RPM — confirm your implement’s requirement.

✓ Connection Type: Yoke output for standard shaft tubes, splined shaft for inline assemblies, or flanged output for direct gearbox mounting.

✓ Overload Frequency: Frequent overloads favor auto-reset types (ratchet, friction, automatic). Infrequent but severe overloads suit shear bolt types.

✓ Environmental Conditions: Consider dust, moisture, temperature extremes. Sealed automatic and friction types offer superior protection in harsh environments.

Need help choosing? Kontaktieren Sie unser Ingenieurteam. for personalized selection assistance.

Quality Certification & Service Commitment

ISO 9001:2015

Certified quality management system ensuring consistent product excellence

CE Marked

Compliant with European safety, health, and environmental protection standards

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12-Month Warranty

Full warranty against manufacturing defects under normal operating conditions

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Global Shipping

Fast worldwide delivery with professional export packaging and documentation

PTO drive shaft torque limiter manufacturing workshop

Frequently Asked Questions (FAQ)

What torque rating do I need for my implement?

The required torque rating depends on your implement’s maximum operating torque. As a general rule, select a torque limiter rated at 1.2 to 1.5 times the implement’s normal peak operating torque. Consult your implement manufacturer’s specifications or contact our engineering team for personalized guidance.

How do I know when the torque limiter has activated?

Depending on the type: shear bolt limiters show a visibly sheared bolt; ratchet limiters produce a distinct clicking sound during slip; friction limiters emit a slight odor and sound during sustained slipping; automatic cam limiters produce a clicking sensation. In all cases, the implement stops receiving power while the PTO shaft continues turning.

Can I adjust the torque setting?

Friction-type and automatic (cam-type) torque limiters allow field adjustment of the torque setting by changing spring preload through bolt tension. Shear bolt types are set by the bolt grade and cannot be adjusted — different torque ratings require different bolt specifications. Ratchet types have a fixed setting determined by the number and spring rate of the pawls.

What maintenance does the torque limiter require?

Regular greasing through the grease nipple (every 8 operating hours), visual inspection for wear or damage before each season, and replacement of worn friction linings (friction types) or keeping spare shear bolts on hand (shear bolt types). Automatic and ratchet types require minimal maintenance beyond lubrication.

Is this torque limiter compatible with my PTO shaft?

This product uses standard 1 3/8″ Z6, 1 3/8″ Z21, 1 3/4″ Z6, 1 3/4″ Z20 spline connections, which are compatible with the vast majority of agricultural PTO shafts worldwide. If your equipment uses a different spline configuration, we offer adapters and custom spline options. Contact us with your shaft specifications for confirmation.

What is the difference between 540 RPM and 1000 RPM PTO?

Standard PTO operates at 540 RPM and is used for most agricultural implements. Economy PTO (also called 1000 RPM PTO) is used for lighter implements to reduce engine RPM and fuel consumption. Our torque limiters are rated for both speeds. Select the spline size matching your PTO standard: typically 1 3/8″ Z6 for 540 RPM and 1 3/4″ Z20 for 1000 RPM.

Do you offer OEM and private-label manufacturing?

Yes, we provide full OEM manufacturing services including custom torque ratings, special spline configurations, custom markings, and private-label packaging. Minimum order quantities apply. Contact our sales team at the link below to discuss your requirements.

What Our Customers Say

🇳🇿 Craig W.Dairy farmer, Waikato, New Zealand

“Using these on our pasture toppers and feed wagons. They’ve saved our PTO shafts from damage multiple times when hitting hidden stumps. Brilliant design — the auto-reset means we don’t lose any milking time.”

★★★★★

🇬🇧 William D.Arable contractor, Yorkshire, United Kingdom

“Top-notch manufacturing quality. These drop straight onto standard UK PTO shafts and the torque ratings are spot-on. I’ve fitted them on cultivators, grain drills, and mowers — all performing perfectly.”

★★★★★

🇦🇺 James M.Grain farmer, NSW, Australia

“We fitted these torque limiters on all our header drives after losing a gearbox last harvest. They’ve triggered twice on hidden rocks and saved us thousands in repairs each time. Absolutely essential equipment for Australian broadacre farming.”

★★★★★

🇩🇪 Hans K.Agricultural contractor, Bavaria, Germany

“Excellent build quality — typical of what we expect for professional machinery. The torque ratings are accurate and the fit on our Walterscheid PTO shafts is perfect. We’ve standardized on these across our fleet.”

★★★★★

🇧🇷 Carlos S.Sugarcane equipment dealer, São Paulo, Brazil

“Reliable performance in extremely tough conditions. Brazilian sugarcane operations are brutal on drivelines, and these limiters consistently protect our customers’ equipment. Great value for the price.”

★★★★★

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Matched gearboxes designed to work seamlessly with our PTO shafts and torque limiters.

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Available PTO Accessories:

• PTO shaft yokes (plain bore, splined, quick-release)

• Safety shields and guard tubes (EN 12965 compliant)

• Spline adapters (1 3/8″ to 1 3/4″ conversion)

• Cross bearing kits and U-joint repair kits

• Telescoping PTO shaft tubes (triangular and lemon profile)

• Push pin kits and retaining hardware

Ready to Protect Your Equipment?

Whether you need a single replacement unit or bulk OEM supply, our team is ready to help you select the perfect torque limiter for your application. We offer competitive B2B pricing, technical consultation, and fast global delivery.

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OEM & distributor partnerships welcome · MOQ as low as 10 units · Custom specifications available