Ratschen-Drehmomentbegrenzer

PTO Shaft Ratchet Torque Limiter – SAS3 Series (with Splined Shaft)

Der SAS3 Series Ratchet Torque Limiter provides heavy-duty automatic-reset overload protection through a splined shaft output, rated at 1200 Nm. The 24-pawl engagement system ensures smooth, reliable torque limiting even under severe overload conditions, while the ball collar kit provides secure axial retention. With dual 1 3/8″ Z6 splines (female/male) and a compact 164.5mm overall length, the SAS3 integrates directly into inline PTO assemblies for large agricultural implements. Heavy-duty 24-pawl system, self-resetting protection, Und compact splined-shaft design make this an essential safety component for demanding operations.

Artikelnummer: 2e9e5d2fcbc0 Kategorie: Schlagwörter: , , , , , , , , ,

Beschreibung

PTO Shaft Ratchet Torque Limiter – SAS3 Series (with Splined Shaft)

Ratchet Torque Limiter for PTO shaft - SAS3 series

Der PTO Shaft Ratchet Torque Limiter – SAS3 Series (with Splined Shaft) ist von Premiumqualität Ratschen-Drehmomentbegrenzer 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: SAS3

Drehmomentbereich: Drehmoment: 1200 Nm

Spline-Optionen: 1 3/8″ Z6 (female & male)

Hauptkomponenten: Circlip, Retaining washer, Dust guard ring, Ball collar kit, Hub, Pawl kit (Qty.=24), Housing with yoke, Grease nipple

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Technische Daten und Abmessungen

Serie Setting Torque (Nm) Spline (female) Spline (male) A (mm) B (mm) C (mm)
SAS3 1200 1 3/8″Z6 1 3/8″Z6 164.5 22 38

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 Ratchet Torque Limiter technical drawing and assembly

Hauptmerkmale und Vorteile

🔒

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.

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Materialien in Industriequalität

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

🛠

Universelle Nebenantriebskompatibilität

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

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Sealed & Protected Design

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

Funktionsweise – Funktionsprinzip

The ratchet torque limiter uses spring-loaded pawl kits that engage with a precision-machined ratchet ring inside the housing. Under normal conditions, the pawls lock into the ratchet profile and transmit full torque. When an overload occurs and torque exceeds the spring preload setting, the pawls are forced out of engagement, and the clutch slips with a characteristic clicking sound. Once the overload condition clears, the pawls automatically re-engage with the ratchet on the next revolution, restoring full torque transmission without any manual intervention. The number of pawls determines the smoothness of the ratcheting action and the overall torque capacity — more pawls provide smoother slipping and higher ratings.

Zurücksetzen-Methode: Automatic — self-resetting after overload clears

Am besten geeignet für: Equipment experiencing frequent, transient overloads where zero-downtime reset is critical

Typische Anwendungsszenarien in der Landwirtschaft

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.

Grain Augers & Conveyors

Prevents auger tube distortion and gearbox failure when grain bridges, moisture-swollen grain, or foreign objects create sudden resistance in the conveying path.

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.

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 (female & male)). 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

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ISO 9001:2015

Certified quality management system ensuring consistent product excellence

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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 (female & male) 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

🇦🇺 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.”

★★★★★

🇨🇦 Robert T. — Hay producer, Alberta, Canada

“Running on our round balers through three seasons now without a single issue. The auto-reset feature is a huge advantage during busy harvest — no stopping to replace shear bolts when you hit a gopher mound.”

★★★★★

🇮🇳 Vikram P. — Farm equipment distributor, Punjab, India

“Excellent product for the Indian market. Compatible with all major tractor brands including Mahindra, TAFE, and Sonalika. Our customers appreciate the reliability and competitive pricing.”

★★★★★

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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

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