Gearbox for Disc Mower

執筆者 | 2026 年 3 月 27 日 | 農業用ギアボックス

High-Performance Agricultural Gearbox for Disc Mower Applications

Productive hay cutting starts with dependable power transmission. The Disc Mower gearbox we manufacture is a precision instrument — not a commodity part. The disc mower gearbox sits within the cutter bar, driving a series of spinning discs via an internal gear train. Each disc rotates at high speed (approximately 3,000 RPM), and the gearbox distributes PTO power evenly across all discs to ensure a uniform cut.

From the hardened gear teeth to the heavy-duty shaft seals, every element is selected and assembled to deliver thousands of hours of trouble-free service. Australian farmers operating in dust, heat, mud, and moisture rely on this gearbox to perform consistently throughout the most demanding seasons.

Disc Mower Agricultural Gearbox

⚙ Disc Mower Gearbox — Engineering Data Sheet

The following table presents key engineering parameters for our agricultural disc mower gearbox. Every specification listed can be modified through our custom manufacturing service.

仕様 Rated Value Customization
過負荷保護 ラジアルピンクラッチ Adjustable trip settings
ギアコア硬度 HRC 36 Tough shock-absorbing core
Maximum Input Torque 500 Nm With overload protection
プライマリーギアタイプ Planetary Gears Custom tooth profiles on request
入力軸径 25 mm Custom diameters
Drain Plug Type Sight glass + drain combo Sampling port option
潤滑方法 Forced circulation Forced lube for high-duty cycles
Breather / Vent Sintered bronze breather All-weather types
表面コーティング Zinc phosphate + enamel Custom RAL colours available
反発 ≤ 10 arc-minutes Reduced backlash option
Gear Surface Hardness HRC 56 – 65 Carburized + ground
IP Protection Class IP66 Up to IP67 on request
Shaft Seal Type Mechanical Face Seal Triple-lip and cassette options
出力軸径 25 mm Match to implement coupling
Quality Certification AS/NZS ISO 9001 Audit reports available
石油生産能力 0.6 litres Oversized sump available
定格負荷時の効率 95% Measured on dynamometer
Ambient Temperature Range -25°C to +90°C Arctic / tropical variants
正味重量 14 kg Varies by configuration
PTO Input Speed 540 / 1000 RPM Economy PTO (750 RPM) option available

お問い合わせ先 エンジニアリングチーム for a detailed specification sheet tailored to your disc mower model and hay cutting conditions.

💪 Quality Comparison — Disc Mower Gearbox

Professional hay cutting operators know that gearbox quality directly impacts productivity. This comparison proves why our Disc Mower gearbox is the professional choice:

特徴 Budget / Import Gearbox Our Premium Disc Mower Gearbox
表面保護 Bare casting with thin oil film Cathodic e-coat + powder coat, 1000-hr salt spray test
Expected Service Life Unpredictable — many fail within first season Designed for 10-year / 5,000-hour lifecycle
住宅設計 Welded steel fabrication, dimensional inconsistency FEA最適化された強化リブ付きダクタイル鋳鉄、肉厚は業界平均の2倍
ベアリング仕様 Standard open bearings, no pre-load Heavy-duty spherical roller bearings rated for 150% dynamic overload capacity
保証とサポート 6-month limited warranty, difficult claims process Full 2-year warranty + engineer hotline + install support
Spare Parts Parts catalogue unavailable Complete rebuild kits off-the-shelf

When your livelihood depends on your disc mower performing during critical hay cutting windows, a quality gearbox is essential. Choose the gearbox validated by millions of Australian field hours.

Disc Mower application

🔧 Power Pathway: How Your Disc Mower Gearbox Works

Let us examine how the gearbox in a disc mower operates:

Subsystem 関数
PTO Input Power enters through a precision-machined splined coupling accepting 540 RPM (1-3/8″) or 1000 RPM (1-3/4″) PTO output. The input shaft rides on double-row tapered roller bearings selected specifically for the load profile of hay cutting applications.
Gear Reduction Precision planetary gears inside the gearbox reduce PTO speed while multiplying torque to match the disc drive train’s demands. The disc mower gearbox sits within the cutter bar, driving a series of spinning discs via an internal gear train. Each disc rotates at high speed (approximately 3,000 RPM), and the gearbox distributes PTO power evenly across all discs to ensure a uniform cut. The gears are manufactured from carburized alloy steel, ground to tight tolerances, and profiled for quiet, efficient power transfer.
Output Drive The transformed power exits through the output shaft to the disc mower’s working mechanism, specifically driving the disc drive train for core hay cutting function. The output connection is engineered for vibration-free, backlash-free transmission at the point of work.
Sealing & Lubrication Every shaft penetration is protected by a VITON FKM lip seal, creating multi-barrier defense against dust, moisture, and crop debris. mineral 85W-90 GL-4 provides continuous splash lubrication. The cast iron housing features integrated cooling fins for thermal management.

🔄 OEM Replacement Reference — Disc Mower Agricultural Gearbox

Product names below serve as a compatibility guide for replacement purposes. No endorsement or sponsorship by the listed brands is implied.

Click each manufacturer below to see verified compatible disc mower models:

Kubota ✅
Compatible models: Model 2874, Mk-II, Type 54L. Direct bolt-on replacement — no modifications required.
Bobcat ✅
Compatible models: G7.3, H-917, Model 9166. Direct bolt-on replacement — no modifications required.
Branson ✅
Compatible models: Series 850, Type 90F, 227R. Direct bolt-on replacement — no modifications required.
Amazone ✅
Compatible models: C-835, Mk-III, Type 27C. Direct bolt-on replacement — no modifications required.
Caterpillar ✅
Compatible models: F-164, Mk-V, G7.3. Direct bolt-on replacement — no modifications required.
Zetor ✅
Compatible models: 974S, G3.5, Mk-II. Direct bolt-on replacement — no modifications required.

Service Components

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

🎯 Disc Mower Gearbox Sizing Guide — Get the Right Fit First Time

Use this step-by-step guide to identify the exact gearbox model for your disc mower. Click each step for detailed instructions.

Step 1: Existing Gearbox Identification

How: 交換するギアボックスの銘板に記載されているブランド、モデル番号、および部品番号を記録してください。

Why it matters: Speeds up the matching process and ensures dimensional compatibility with your hay cutting implement

Step 2: Required disc drive train Speed

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

Why it matters: PTO速度と合わせて、ギアボックスに必要な正確なギア比を決定します。

Step 3: Working Hours per Season

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

Why it matters: High-hour operations justify premium bearing and gear specifications for lowest cost per hour

Step 4: Power Requirement

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

Why it matters: 定格が低すぎると過熱や早期故障につながり、定格が高すぎると不必要なコストと重量が増加する。

Step 5: Operating Environment

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

Why it matters: Determines the appropriate seal grade, surface coating, and housing material specification

Step 6: Tractor PTO Speed

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

Why it matters: Determines the input shaft spline size and the baseline for ratio calculation

Step 7: Mounting Bolt Pattern

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

Why it matters: 加工やアダプタープレートを一切必要とせず、直接ボルトオンで取り付けられます。

💡 プロのヒント： For fastest service, email us the old gearbox part number (if visible), your tractor brand and model, and your disc mower manufacturer and model. Our engineers will confirm the exact match and provide a quotation within one business day.

Agricultural Gearbox Collection

🔧 Technician’s Installation Manual — Disc Mower Gearbox

Follow these instructions for a successful installation of your new Disc Mower gearbox. Correct installation is critical for achieving maximum service life and warranty coverage.

Step 1: Remove Old Gearbox

PTOドライブシャフトをギアボックスの入力シャフトから切り離します。フロアジャッキまたは天井クレーンでギアボックスの重量を支えます（一般的な重量：モデルによって15～70kg）。締め付け応力を均等に解放するため、すべての取り付けボルトを十字型に外します。古いギアボックスを慎重に下ろし、脇に置きます。

Step 2: Drain & Document Old Gearbox

Locate the drain plug on the existing gearbox and position a catch container underneath. Remove the drain plug and allow all oil to drain completely — inspect the oil for metal particles or discolouration that may indicate internal wear. Record the old gearbox model number, mounting bolt size, and shaft dimensions for reference.

Step 3: Connect Output to disc drive train

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.

Step 4: Prepare the Mounting Surface

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.

Step 5: Fill With Lubricant

注入口プラグを取り外し、レベルインジケーターに達するまで推奨ギアオイルをゆっくりと注入します。ギアボックスの取扱説明書に記載されている潤滑油グレード（通常はSAE 80W-90 GL-5または同等品）を使用してください。注入口プラグを元に戻し、手で締めた後、レンチでしっかりと締めます。ブリーザーキャップが清潔で、詰まりがないことを確認してください。

Step 6: Connect PTO Driveline

PTOドライブラインをギアボックスの入力シャフトに合わせ、ロック機構がかみ合うまでヨークをスプラインにスライドさせます。スプラインの数が一致していることを確認してください（540 RPMの場合は6スプライン、1000 RPMの場合は21スプライン）。ドライブラインの動作角度が15°を超えないことを確認してください。角度が大きすぎると、ユニバーサルジョイントの早期破損や振動の原因となります。

Step 7: Safety Preparation

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.

Step 8: Test Run & Break-In

トラクターを始動し、低回転数（約300回転/分）でPTOを作動させます。異音（研磨音、うなり音、ノッキング音、カチカチ音など）がないか注意深く聞いてください。15～20分間低速で運転し、ギアボックスハウジングの温度を（注意深く）手で監視します。すべてのシールと取り付け面からのオイル漏れがないか確認してください。徐々に最高運転速度まで上げていきます。

⚠ 重要: Always consult the specific installation manual shipped with your Disc Mower gearbox for model-specific torque values and procedures.

🚧 Symptom-Cause-Fix Guide for Your Disc Mower Gearbox

Use this diagnostic reference to identify and resolve common Disc Mower gearbox issues in the field. Most problems can be diagnosed and addressed without removing the gearbox from the disc mower.

⚠ Abnormal Grinding or Whining Noise

推定原因： Insufficient lubricant or incorrect oil grade

推奨される行動： Drain and inspect oil for metal particles. Refill with correct grade. If noise persists after oil change, bearing or gear inspection is required. Contact support for rebuild guidance.

⚠ギアボックスが過熱しています

推定原因： Operating beyond rated horsepower or duty cycle

推奨される行動： 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.

⚠ PTOドライブラインとギアボックスの接続に問題があります

推定原因： Rust or debris on the input shaft splines

推奨される行動： 入力シャフトのスプラインをワイヤーブラシで清掃し、焼き付き防止剤を薄く塗布します。PTOシャフトをゆっくりと回転させながら押し込み、スプラインを合わせます。スプラインがかみ合わない場合は、スプライン数がPTOの規格と一致していることを確認してください（540 RPMの場合は6スプライン、1000 RPMの場合は21スプライン）。

⚠ 入力軸が回転している間、出力軸の回転が停止します

推定原因： Stripped gear teeth or broken gear

推奨される行動： まず過負荷保護装置を確認してください。ギアボックスに最近急激な過負荷がかかった場合は、これが最も可能性の高い原因です。マニュアルに従って、せん断ボルトを交換するか、スリップクラッチをリセットしてください。過負荷保護装置に異常がない場合は、ギアボックス内部に損傷があり、専門業者による修理が必要です。

⚠ PTO作動時にギアボックスから金属的なカチッという音がする

推定原因： Loose internal components or retaining hardware

推奨される行動： PTO作動時のみに発生する異音（運転中は発生しない）は、通常、ドライブシャフトのバックラッシュを示しています。ドライブシャフトの伸縮チューブの摩耗を確認してください。運転中に異音が発生する場合は、内部摩耗によるギアのバックラッシュ過多が考えられます。異音が徐々に大きくなる場合は、ギアボックスの点検を受けてください。

上記の手順で問題が解決しない場合は、 技術サポートチームにお問い合わせください 専門家による診断をご希望の場合は、遠隔でのトラブルシューティングや、重大な故障状況における代替機の派遣も承ります。

📝 From the Field: Australian Farmers Review the Disc Mower Gearbox

Our agricultural gearboxes are field-proven across every Australian state and territory. Below are documented case studies from recent Disc Mower gearbox installations.

📍 Case #1: Mudgee, NSW

お客様： Tom Gallagher — large-scale pastoral property
位置： Mudgee, NSW
農場規模： 450エーカー
応用： Disc Mower gearbox for disc mower — hay cutting
購入理由： Retrofit older model disc mower with improved gearbox for extended service life

“The technical support was exceptional. They asked detailed questions about our setup, recommended the correct model and ratio, and followed up after installation to confirm everything was operating correctly. That level of service is rare.”
— Tom Gallagher, Mudgee, NSW

Eric Hartley — Dalby, QLD

手術： multi-generational family farm | サイズ： 1000 acres | 使用： Disc Mower gearbox for hay cutting

購入理由： Replace failed OEM gearbox to restore disc mower for the upcoming season

“Our disc mower operates in extremely dusty conditions and we were going through gearboxes every season. This one has survived 4 seasons and is still running perfectly. The sealing is clearly superior to what we had before.”

📍 Armidale, NSW intensive horticultural farm — 1500 acres

クライアント： Nathan Brooks | 応用： Disc Mower gearbox — hay cutting

目的： 1シーズンも持たなかった安価な社外品からのアップグレードです。

“Installed as a replacement for a gearbox that catastrophically failed mid-season. The MowerGearbox unit was delivered within 5 days and fitted perfectly. We finished the season without further issues. Very impressed.”

📍 Case #4: Kadina, SA

お客様： Mark Sullivan — organic certified farm
位置： Kadina, SA
農場規模： 6000 acres
応用： Disc Mower gearbox for disc mower — hay cutting
購入理由： Custom ratio requirement for a modified disc mower not served by standard catalogues

“We operate in a tropical climate and corrosion has been a persistent problem with gearboxes. The coating on this unit is noticeably more robust — no rust after 1 full seasons of outdoor storage.”
— Mark Sullivan, Kadina, SA

Andrew Patterson — Devonport, TAS

手術： broadacre cropping operation | サイズ： 3500 acres | 使用： Disc Mower gearbox for hay cutting

購入理由： New equipment build — specifying aftermarket gearbox as OEM improvement

「決め手となったのは、包括的な保証でした。除外事項も細かい条項も一切ありませんでした。異音について質問した際（ギアボックスではなく、駆動系の問題だったことが判明しました）、電話で無料で診断してくれました。」

❓ Disc Mower Gearbox FAQ — Everything You Need to Know

🔹 あなたのギアボックスは、純正のOEMユニットと比べてどうですか？

当社のギアボックスは、測定可能なすべてのパラメータにおいて、純正品と同等またはそれ以上の性能を発揮します。主な改良点としては、ベアリングクラスのアップグレード、優れたシール材の使用、放熱性能の向上、そして純正品カタログにはないカスタムギア比のオプションなどが挙げられます。その結果、純正品と交換するだけで、通常は純正品よりも長持ちする製品が実現しました。

🔹 What gear ratios are available for the disc mower gearbox?

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.

🔹 Will this gearbox fit older-model disc mower equipment?

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.

🔹 What payment and ordering options do you offer?

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.

🔹 Can I return a gearbox if it does not fit my disc mower?

ご注文前に機器の詳細をご提供いただき、弊社で互換性を確認させていただければ、適合は保証いたします。万が一、互換性の問題が発生した場合は、お届け後30日以内であれば、未使用のギアボックスを無条件で交換または返金いたします。弊社は、初回のご注文で最適なギアボックスをお届けすることを目指しております。

🔹オーストラリアの遠隔地の農業地域にも配達してもらえますか？

はい、オーストラリア全土の郵便番号地域（遠隔地や地方を含む）へ配送いたします。季節ごとの機器ニーズの緊急性を理解している経験豊富な農業貨物運送業者を利用しています。緊急故障時には速達便をご利用いただけます。また、人気モデルは即日発送できるよう在庫を確保しています。

🔹 自分の機器に適したギアボックスのモデルはどのように選べばよいですか？

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.

🔹 Can this gearbox withstand the shock loads generated during hay cutting?

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.

🔹 What does the warranty cover and for how long?

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.

🔹ギアボックスは現場で整備またはオーバーホールできますか？

定期点検（オイル交換、シール交換、ベアリング点検）は、標準工具を使用して現場で実施できます。大規模なオーバーホールには、ベアリング、シール、ガスケットを含む完全なオーバーホールキットをご用意しています。詳細なサービスマニュアルとビデオガイドは、サポートポータルからダウンロードできます。

🔗 Related Products — Complete Your Disc Mower Drive System

Maximize your hay cutting equipment reliability with these complementary products designed to work with our Disc Mower gearbox.

⚡ PTO Drive Shaft for Your Disc Mower

PTO Shaft

Agricultural PTO shaft assemblies with shear-bolt or friction-clutch overload protection. Available in lengths from 600mm to 2500mm for any tractor-to-disc mower distance.

PTOシャフトを購入する →

⚙ 農業用ギアボックスのフルラインナップ

Gearbox Collection

Browse our full range of agricultural gearboxes — from mower drives to harvester transmissions. Every unit built to the same premium standards as our Disc Mower gearbox.

すべてのギアボックスを見る →

⚖ Legal Requirements for Disc Mower Agricultural Equipment

Australian farmers must ensure all agricultural machinery — including disc mower with PTO-driven gearboxes — meets applicable safety standards. Here is a summary of the requirements relevant to your Disc Mower gearbox:

Regulatory Framework

AS/NZS 3788 — Pressure Equipment
Gearbox housings safely contain internal operating pressures in compliance with applicable standards.
ISO 12100 — Safety of Machinery
Gearbox design follows the general principles of risk assessment and risk reduction for hay cutting equipment.
ISO 6336 — Gear Load Capacity
All gears rated and verified per international standards for tooth root fatigue and surface durability.

State Workplace Safety Legislation

Victoria — OHS Regulations 2017
specifies risk assessment requirements for hay cutting machinery operations.
ACT — WHS Regulation 2011
mirrors national standards for agricultural machinery including disc mower equipment.
Tasmania — WHS Regulations 2012
mandates operator training for all PTO-driven disc mower equipment.

Serving Every Agricultural Region in Australia

We deliver Disc Mower agricultural gearboxes to every state and territory in Australia. Our logistics network covers major farming regions including the Wimmera, the Mallee, and Goulburn Valley, Western Districts VIC, Gippsland, and the North East, and the Barossa Valley, the Riverland, and South East SA. Whether you operate in a metropolitan fringe area or a remote pastoral station, we ship directly to your property with full tracking and delivery confirmation.

📧 Request a Custom Quotation — Disc Mower Gearbox

Agricultural Gearbox Factory

Manufacturing Excellence — over two decades of Experience

We are a professional manufacturer of agricultural gearboxes and PTO drive systems. Our facility features:

  • Dedicated R&D team for custom and prototype gearbox development
  • In-house metallurgical lab for material verification and hardness testing
  • Full CAD/CAM design with FEA stress analysis
  • Surface finishing: shot peening, superfinishing, and precision lapping
  • 24/7 production capability for urgent and large-volume orders

Custom & Non-Standard Manufacturing

We specialise in non-standard, custom-designed gear drives built to your exact requirements. Whether you need a unique ratio, modified housing, non-standard shaft, or a bespoke gearbox for your disc mower, we deliver — from prototype to volume production.

Send us your drawings, samples, or specifications — and receive a quotation within 24 hours.

🏭 Learn About Our Company →

Your trusted partner for agricultural gearbox solutions — standard and custom — across Australia and worldwide.