Gearbox for Disc Mower

Compatible models: Model 2874, Mk-II, Type 54L. Direct bolt-on replacement — no modifications required.

Compatible models: G7.3, H-917, Model 9166. Direct bolt-on replacement — no modifications required.

Compatible models: Series 850, Type 90F, 227R. Direct bolt-on replacement — no modifications required.

Compatible models: C-835, Mk-III, Type 27C. Direct bolt-on replacement — no modifications required.

Compatible models: F-164, Mk-V, G7.3. Direct bolt-on replacement — no modifications required.

Compatible models: 974S, G3.5, Mk-II. Direct bolt-on replacement — no modifications required.

Bearing kits (input & output), seal kits (all positions), matched gear pairs, shaft assemblies, overhaul kits, hardware packs. All ship within 24-48 hours.

Comment: Notez la marque, le numéro de modèle et toutes les références figurant sur la plaque signalétique de la boîte de vitesses remplacée.

Pourquoi c'est important : Speeds up the matching process and ensures dimensional compatibility with your hay cutting implement

Comment: Refer to your disc mower manufacturer’s manual for the recommended disc drive train operating speed

Pourquoi c'est important : Associé à la vitesse de la prise de force, cela définit le rapport de transmission exact dont votre boîte de vitesses a besoin.

Comment: Estimate your annual operating hours for the disc mower to determine appropriate service life rating

Pourquoi c'est important : Les opérations à forte cadence justifient des spécifications haut de gamme pour les roulements et les engrenages afin d'obtenir le coût horaire le plus bas.

Comment: Match the gearbox HP rating to your tractor’s PTO horsepower output and the disc mower’s demand

Pourquoi c'est important : Under-rating leads to overheating and premature failure; over-rating adds unnecessary cost and weight

Comment: Assess exposure to dust, moisture, chemicals, and temperature extremes in your typical hay cutting conditions

Pourquoi c'est important : Détermine le degré d'étanchéité approprié, le revêtement de surface et les spécifications du matériau du boîtier

Comment: Check your tractor’s PTO specification — standard is 540 RPM or 1000 RPM

Pourquoi c'est important : Determines the input shaft spline size and the baseline for ratio calculation

Comment: Measure the bolt hole positions, centre distances, and overall envelope on your disc mower’s gearbox mounting flange

Pourquoi c'est important : Permet une installation directe par boulonnage, sans aucune fabrication ni plaque d'adaptation.

Disconnect the PTO driveline from the gearbox input shaft. Support the gearbox weight with a floor jack or overhead hoist (typical weight: 15-70 kg depending on model). Remove all mounting bolts in a criss-cross pattern to relieve clamping stress evenly. Carefully lower the old gearbox and set it aside.

Repérez le bouchon de vidange de la boîte de vitesses existante et placez un récipient de récupération en dessous. Retirez le bouchon et laissez l'huile s'écouler complètement. Examinez l'huile afin de détecter la présence de particules métalliques ou une décoloration pouvant indiquer une usure interne. Notez la référence de l'ancienne boîte de vitesses, le diamètre des boulons de fixation et les dimensions de l'arbre pour référence.

Attach the gearbox output shaft to the disc mower’s disc drive train drive coupling. For keyed connections, align the keyway and slide the coupling on, then secure with the retaining bolt and torque to specification. For splined outputs, apply anti-seize to the splines and verify full engagement before locking.

Clean the mounting flange on the disc mower frame with a wire brush and solvent, removing all old sealant, rust, and debris. Inspect the mounting surface for cracks, stripped threads, or warping. Chase any damaged bolt threads with a tap. Apply a thin film of anti-seize compound to the mounting face if specified.

Retirez le bouchon de remplissage et ajoutez lentement l'huile de boîte de vitesses recommandée jusqu'au repère de niveau. Utilisez la viscosité spécifiée dans la documentation de la boîte (généralement SAE 80W-90 GL-5 ou équivalent). Remettez le bouchon de remplissage en place et serrez-le à la main, puis à l'aide d'une clé. Vérifiez que le bouchon de mise à l'air libre est propre et dégagé.

Alignez la transmission de la prise de force avec l'arbre d'entrée de la boîte de vitesses et glissez le joug sur les cannelures jusqu'à l'enclenchement du mécanisme de verrouillage. Vérifiez que le nombre de cannelures correspond (6 cannelures pour 540 tr/min, 21 cannelures pour 1 000 tr/min). Assurez-vous que les angles de fonctionnement de la transmission ne dépassent pas 15° ; des angles excessifs entraînent une usure prématurée du joint de cardan et des vibrations.

Park the tractor on firm, level ground. Engage the parking brake and place wheel chocks. Turn off the engine and remove the key. Disconnect the PTO shaft from the disc mower. Allow all components to cool completely before touching. Wear appropriate PPE including gloves and safety glasses.

Start the tractor and engage the PTO at low RPM (approximately 300 RPM). Listen carefully for any grinding, whining, knocking, or clicking sounds. Run at low speed for 15-20 minutes, monitoring the gearbox housing temperature by hand (carefully). Check for oil leaks at all seals and the mounting interface. Gradually increase to full operating speed.

Cause probable : Lubrifiant insuffisant ou huile de qualité inadéquate

Action recommandée : Vidangez l'huile et vérifiez l'absence de particules métalliques. Remplissez-la avec l'huile de la viscosité appropriée. Si le bruit persiste après la vidange, une inspection des roulements ou des engrenages est nécessaire. Contactez l'assistance technique pour obtenir des instructions de réfection.

Cause probable : Fonctionnement au-delà de la puissance nominale ou du cycle de service

Action recommandée : Check oil level and grade against the specification. Clean all debris from the housing exterior — especially the cooling fins. If the disc mower is being operated at or above the gearbox’s rated power, reduce forward speed or PTO load. Consider upgrading to synthetic gear oil for improved thermal performance.

Cause probable : Rust or debris on the input shaft splines

Action recommandée : Clean the input shaft splines with a wire brush and apply a light coat of anti-seize. Slowly rotate the PTO shaft while pushing to align the splines. If the splines will not engage, verify the spline count matches your PTO standard — 6-spline for 540 RPM, 21-spline for 1000 RPM.

Cause probable : Stripped gear teeth or broken gear

Action recommandée : Check the overload protection device first — this is the most likely cause if the gearbox was recently subjected to a sudden overload. Replace the shear bolt or reset the slip clutch per the manual. If overload protection is intact, the gearbox has internal damage and requires professional service.

Cause probable : composants internes desserrés ou quincaillerie de fixation

Action recommandée : Un claquement lors de l'engagement de la prise de force (mais pas en fonctionnement) indique généralement un jeu dans la transmission ; vérifiez l'usure du tube télescopique. Si le claquement se produit en fonctionnement, il peut indiquer un jeu excessif des engrenages dû à l'usure interne. Si le bruit s'aggrave, faites inspecter la boîte de vitesses.

Our gearbox matches or exceeds OEM specifications across all measurable parameters. Key improvements include upgraded bearing classes, superior seal materials, enhanced heat dissipation, and the option for custom gear ratios that OEM catalogues do not offer. The result is a drop-in replacement that typically outlasts the original.

We offer a comprehensive range of ratios from 1:1 through 1:6 to match virtually any disc mower configuration. Standard catalogue ratios ship within days; custom ratios can be manufactured within 2-3 weeks. Our engineers will recommend the optimal ratio based on your tractor PTO speed and hay cutting requirements.

We maintain compatibility databases covering disc mower models from the past 25+ years. Most older models can be directly fitted with our current gearbox range. For discontinued or rare models, send us the mounting dimensions and shaft specifications, and we will confirm fitment or design a custom adapter.

We accept bank transfer, credit card, and purchase orders from established accounts. For large orders, we offer 30-day payment terms subject to credit approval. Orders can be placed through our website, by email, or by phone. Pro-forma invoices are available for pre-payment arrangements.

If you provide your equipment details before ordering and we confirm compatibility, fitment is guaranteed. In the rare event of a compatibility issue, we offer a no-questions-asked exchange or refund on unused gearboxes within 30 days of delivery. Our goal is to match you with the correct gearbox on the first order.

Yes — we ship to every postcode in Australia, including remote and regional areas. We use experienced agricultural freight carriers who understand the urgency of seasonal equipment needs. Express shipping is available for emergency breakdown situations, and we maintain stock for immediate dispatch of popular models.

Provide us with your tractor brand/model and PTO speed, the disc mower manufacturer and model, and the old gearbox part number if available. Alternatively, measure the input/output shaft dimensions and mounting bolt pattern. Our selection engineers will identify the correct match, typically within 24 hours.

The gearbox is specifically designed for the dynamic and impact loading characteristic of hay cutting applications. Case-hardened alloy steel gears absorb repetitive shocks, while the optional overload protection (shear bolt or slip clutch) safeguards against catastrophic overload events. The bearing selection and housing rigidity are both matched to disc mower load profiles.

Our 24-month comprehensive warranty covers all defects in materials and workmanship, including bearings, gears, seals, and housing. It applies from the date of purchase and is backed by our ISO-certified quality management system. Extended warranty programs are available for bulk and fleet orders.

Routine service (oil changes, seal replacement, bearing inspection) can be performed on-site with standard tools. For major rebuilds, we supply complete overhaul kits containing all bearings, seals, and gaskets. Detailed service manuals and video guides are available for download from our support portal.

Gearbox housings safely contain internal operating pressures in compliance with applicable standards.

Gearbox design follows the general principles of risk assessment and risk reduction for hay cutting equipment.

All gears rated and verified per international standards for tooth root fatigue and surface durability.

specifies risk assessment requirements for hay cutting machinery operations.

mirrors national standards for agricultural machinery including disc mower equipment.

mandates operator training for all PTO-driven disc mower equipment.