PTO Shaft Friction Torque Limiter – FF Series (Standard Yoke Type)

Der FF Series Friction Torque Limiter provides smooth, slip-type overload protection for PTO shafts using calibrated friction discs and spring-loaded pressure plates. Covering 800–3000 Nm across Φ120 to Φ160 disc sizes, it allows controlled torque limiting with a gradual slip action rather than an abrupt disconnect. The standard yoke housing connects directly to PTO shaft tubes. Ideal for implements that experience frequent, moderate overloads where smooth energy dissipation is preferred — such as manure spreaders, feed mixers, and disc mowers. Smooth slip action, infinite auto-reset, Und adjustable torque via spring preload make the FF series exceptionally versatile for medium to heavy-duty PTO applications.

Beschreibung

PTO Shaft Friction Torque Limiter – FF Series (Standard Yoke Type)

Friction Torque Limiter for PTO shaft - 4FF0 series

Der PTO Shaft Friction Torque Limiter – FF Series (Standard Yoke 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: 4FF0, 5FF0, 4FF1, 4FF1D, 5FF1, 5FF1D, 6FF1, 6FF1D, 4FF2, 4FF2D, 5FF2, 5FF2D, 5FF2C, 5FF2E, 6FF2, 6FF2D, 6FF2C, 6FF2E, 7FF2, 7FF2D, 7FF2C, 7FF2E, 7NFF2, 7NFF2D, 7NFF2C, 7NFF2E, 8FF2, 8FF2D, 8FF2C, 8FF2E, 5FF3, 5FF3.D, 6FF3, 6FF3.D, 5FF4, 5FF4D, 5FF4C, 5FF4E, 6FF4, 6FF4D, 6FF4C, 6FF4E, 7FF4, 7FF4D, 7FF4C, 7FF4E, 7NFF4, 7NFF4D, 7NFF4C, 7NFF4E, 8FF4, 8FF4D, 8FF4C, 8FF4E, 9FF4, 9FF4D, 9FF4C, 9FF4E, 10FF4, 10FF4D, 10FF4C, 10FF4E, 42FF4, 42FF4D, 42FF4C, 42FF4E

Drehmomentbereich: Drehmoment: 800–3000 Nm

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

Hauptkomponenten: Pressure plate, Internal disc, Friction lining (Qty.=2), Hub, Taper pin for hub (with nuts), Bushing, Flanged yoke, Complete bolt & Spring (Qty.=8)

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Technische Daten und Abmessungen

Serie Maximales Drehmoment (Nm) Reibscheibe Spline A (mm) B (mm) C (mm)
4FF0 800 Φ120 1 3/8″Z6 135 29 Φ160
5FF0 1000 Φ120 1 3/8″Z6 137 29 Φ160
4FF1 1200 Φ140 1 3/8″Z6 150 29 Φ180
5FF1 1200 Φ140 1 3/8″Z6 152 29 Φ180
6FF1 1200 Φ140 1 3/8″Z6 160 29 Φ180
4FF2 1500 Φ160 1 3/8″Z6 150 29 Φ200
5FF2 1500 Φ160 1 3/8″Z6 152 29 Φ200
6FF2 1500 Φ160 1 3/8″Z6 164 29 Φ200
7FF2 1800 Φ160 1 3/8″Z6 169 29 Φ200
7NFF2 1800 Φ160 1 3/8″Z6 164 29 Φ200
8FF2 1800 Φ160 1 3/8″Z6 169 29 Φ200
5FF3 2000 Φ140 1 3/8″Z6 168 29 Φ180
6FF3 2000 Φ140 1 3/8″Z6 176 29 Φ180
5FF4 2000 Φ160 1 3/8″Z6 168 29 Φ200
6FF4 2000 Φ160 1 3/8″Z6 180 29 Φ200
7FF4 2200 Φ160 1 3/8″Z6 185 29 Φ200
7NFF4 2200 Φ160 1 3/8″Z6 180 29 Φ200
8FF4 2500 Φ160 1 3/8″Z6 185 29 Φ200
9FF4 2800 Φ160 1 3/8″Z6 190 29 Φ200
10FF4 3000 Φ160 1 3/8″Z6 190 29 Φ200
42FF4 2800 Φ160 1 3/8″Z6 190 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

Safety Certified

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

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Compact & Lightweight

Engineered for minimal additional length and weight on the PTO shaft, preserving driveline balance and clearance.

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Mehrere Ausgangskonfigurationen

Erhältlich in Ausführungen mit Joch, Keilwellenantrieb und Flanschausgang, um allen Installationsanforderungen gerecht zu werden.

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Präzisions-Überlastschutz

Kalibriert, um bei exakten Drehmomentschwellenwerten zu trennen und so kostspielige Schäden an Getrieben, Lagern und Gerätemechanismen zu verhindern.

Schnelle Reaktionszeit

Die Funktion reagiert innerhalb von Millisekunden nach Beginn der Überlastung und minimiert so die Dauer der schädlichen Drehmomentübertragung auf angeschlossene Geräte.

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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.

Funktionsweise – Funktionsprinzip

The friction torque limiter uses calibrated spring-loaded pressure plates to clamp friction discs (linings) against an internal disc on the hub. Under normal operating conditions, the static friction between the discs transmits full torque. When torque exceeds the spring preload setting, the friction surfaces begin to slip, dissipating excess energy as heat while maintaining a controlled level of torque transfer. This progressive slip characteristic protects both the driveline and the implement from shock loads. The torque setting can be adjusted by changing the spring preload through the bolt tension. The friction linings are replaceable when worn, and the system resets automatically — there are no consumable bolts or pins to replace.

Zurücksetzen-Methode: Automatisch – kontinuierliches Durchrutschen und Wiedereinrasten

Am besten geeignet für: Applications with frequent moderate overloads requiring smooth, progressive protection and adjustable torque settings

Typische Anwendungsszenarien in der Landwirtschaft

Pfahlbohrer

Absorbiert extreme Drehmomentstöße, wenn der Bohrkopf auf Gestein, vergrabenen Beton oder dichte Wurzelmassen trifft, und schützt so sowohl den Bohrantrieb als auch die Zapfwelle des Traktors.

Schneefräsen & Schneeschleudern

Schützt vor Beschädigungen durch Eisbrocken, gefrorene Trümmer und verdichtete Schneewehen, die plötzliche, extreme Drehmomentbelastungen auf die Laufradwelle ausüben.

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.

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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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.