Australian-Proven Garden Management Machine / Walk-behind Tractor Gearbox — Built for Harsh Field Conditions

When garden management efficiency is your priority, the gearbox connecting your tractor to the walk-behind tractor becomes the most critical component on the implement. Our agricultural gearbox for Garden Management Machine / Walk-behind Tractor applications uses advanced gear technology to maximize power transfer while minimizing heat generation and mechanical wear. In a walk-behind tractor, the gearbox serves as the primary transmission, converting engine power to the tilling rotor and wheel drive. It is a compact, multi-function unit that includes forward/reverse selection and multiple speed ratios for different garden tasks.

Didukung oleh kontrol kualitas yang ketat dan diuji di laboratorium sebelum pengiriman, setiap unit memenuhi standar ketat yang dituntut oleh petani profesional Australia yang tidak mampu menanggung kerusakan di tengah musim.

Garden Management Machine / Walk-behind Tractor Agricultural Gearbox

📊 Detailed Specifications — Garden Management Machine / Walk-behind Tractor Agricultural Gearbox

Kita walk-behind tractor gearbox is manufactured to the following specifications. Custom engineering is available for non-standard garden management applications.

Parameter Nilai
Diameter Poros Keluaran 45 mm
Efisiensi pada Beban Terukur 96%
Lebar Muka Gigi 50 mm
Sistem Pengecatan industri 2 lapis
Umur Desain Bantalan (L10) Minimal 10.000 jam
Jenis Gigi Utama Roda Gigi Lurus
Kapasitas Daya Terukur 18 – 60 HP (13-45 kW)
Bahan Perumahan Grey Cast Iron
Bantalan Utama Cylindrical Roller Bearings
Jumlah Tahap Gigi 3
Parameter Nilai
Pelapisan Permukaan Hot-dip galvanized
Ambient Temperature Range -30°C to +105°C
Reaksi ≤ 12 menit busur
Jenis Segel Poros Cassette Seal
Metode Pelumasan Pelumasan kabut
Rentang Kecepatan Keluaran 209 – 2886 RPM
Centre Distance 110 mm
Gear Surface Hardness HRC 60 – 64
Diameter Poros Masukan 40 mm
Pelumas yang Direkomendasikan SAE 80W-140 multi-grade

Hubungi kami tim teknik for a detailed specification sheet tailored to your walk-behind tractor model and garden management conditions.

💪 Quality Comparison — Garden Management Machine / Walk-behind Tractor Gearbox

The table below documents measurable differences between our premium Garden Management Machine / Walk-behind Tractor gearbox and budget alternatives. Each advantage translates directly into reduced downtime:

Titik Perbandingan Pasar Purna Jual Generik Our Garden Management Machine / Walk-behind Tractor Gear Drive
Garansi & Dukungan Garansi 12 bulan tidak termasuk seal dan bearing. Garansi komprehensif 24 bulan termasuk semua komponen yang aus.
Sistem Penyegelan Segel O-ring standar, perlindungan debu terbatas. Cassette-type metal-cased seal with integrated dirt rejection lip
Suku cadang Parts catalogue unavailable Kit perbaikan lengkap yang tersedia di pasaran
Spesifikasi Bantalan Bantalan daur ulang, kualitas tidak konsisten. Bantalan rol tirus premium, pra-beban presisi, masa pakai L10 10.000 jam
Desain Perumahan Simple sand-cast iron, no FEA optimization Besi cor ulet yang dioptimalkan FEA dengan rusuk penguat, ketebalan dinding 2x rata-rata industri.
Expected Service Life 300-800 hours before first major repair Designed for 10-year / 5,000-hour lifecycle
Kebisingan & Getaran Excessive vibration loosens mounting bolts Balanced rotating assembly, vibration below 2.5 mm/s RMS

Bottom Line: Budget walk-behind tractor gearboxes may save 30-40% upfront but cost 3-5x more through failures and lost productivity. Our Garden Management Machine / Walk-behind Tractor gearbox is the professional’s choice.

Garden Management Machine / Walk-behind Tractor application

🛠 Working Principle — Garden Management Machine / Walk-behind Tractor Agricultural Gearbox

Itu Garden Management Machine / Walk-behind Tractor gearbox Cara kerja operasinya dapat dipahami melalui empat sistem yang saling berhubungan:

1 — Sistem Masukan: Poros PTO traktor Anda terhubung dengan gearbox melalui poros input beralur yang diperkeras. Antarmuka ini mentransmisikan torsi sekaligus memungkinkan sedikit ketidaksejajaran sudut. Di dalamnya, bantalan bola yang dapat menyesuaikan diri sendiri menopang poros input dan mengelola beban gabungan dari torsi yang ditransmisikan dan gaya penggerak.

2 — Sistem Konversi: The gear train employs precision-matched spur gears manufactured from carburized alloy steel. The profile is FEA-optimized to distribute contact stress across the full tooth face. In a walk-behind tractor, the gearbox serves as the primary transmission, converting engine power to the tilling rotor and wheel drive. It is a compact, multi-function unit that includes forward/reverse selection and multiple speed ratios for different garden tasks. Typical mechanical efficiency exceeds 96%.

3 — Sistem Keluaran: The transformed power exits through the output shaft to the walk-behind tractor’s working mechanism, specifically driving the rotor/wheel transmission for core garden management function. The output connection is engineered for vibration-free, backlash-free transmission at the point of work.

4 — Sistem Perlindungan: A multi-layer protection system extends service life: ADI (Austempered Ductile Iron) housing resists impact and corrosion, mechanical face seals block contaminants, mineral 85W-90 GL-4 maintains hydrodynamic film on all surfaces, and a breather vent equalizes pressure during temperature changes.

🔁 Direct Interchange — Garden Management Machine / Walk-behind Tractor Gearbox Compatibility

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

Kita Garden Management Machine / Walk-behind Tractor gearbox directly replaces the factory gear drive on the following walk-behind tractor brands:

Mahindra
Type 99A, E-872
✅ Kompatibel
Olimac
Type 51J, Model 4857
✅ Kompatibel
Landini
Series 355, 531X
✅ Kompatibel
Krone
G7.1, 531T
✅ Kompatibel
Penantang
358T, Type 32B
✅ Kompatibel
New Holland
680Z, Type 36F
✅ Kompatibel
JCB
H-774, Model 9292
✅ Kompatibel

Rebuild Kits & Parts

⚙ Bearings
🔒 Seals
⚙ Gears
🔧 Shafts

📝 Step-by-Step: How to Select Your Garden Management Machine / Walk-behind Tractor Gearbox

Sebelum memesan Garden Management Machine / Walk-behind Tractor gearboxKonfirmasikan parameter-parameter penting ini untuk memastikan kesesuaian dan kinerja yang sempurna:

01

Permintaan Torsi

Calculate the peak torque your garden management application generates — including shock loads from obstacles or material variations

Kotak roda gigi harus mampu menangani torsi puncak tanpa mengaktifkan perlindungan beban berlebih selama pengoperasian normal.

02

Jam Kerja per Musim

Estimate your annual operating hours for the walk-behind tractor to determine appropriate service life rating

Pengoperasian dengan jam kerja tinggi memerlukan spesifikasi bantalan dan roda gigi premium untuk biaya per jam terendah.

03

Lingkungan Operasi

Assess exposure to dust, moisture, chemicals, and temperature extremes in your typical garden management conditions

Menentukan tingkat penyegelan yang sesuai, lapisan permukaan, dan spesifikasi material wadah.

04

Kecepatan PTO Traktor

Periksa spesifikasi PTO traktor Anda — standarnya adalah 540 RPM atau 1000 RPM.

Menentukan ukuran spline poros input dan garis dasar untuk perhitungan rasio.

05

Arah Rotasi

Determine whether the rotor/wheel transmission on your walk-behind tractor requires clockwise or counter-clockwise output when viewed from the drive end

Arah putaran yang salah akan merusak alat atau tidak menghasilkan pekerjaan yang bermanfaat.

06

Jenis Poros Keluaran

Identify the coupling type on your walk-behind tractor — keyed, splined, flanged, or hollow bore

Output yang tidak sesuai memerlukan adaptor penghubung yang mahal dan menimbulkan potensi titik kegagalan.

07

Identifikasi Gearbox yang Ada

Catat merek, nomor model, dan nomor suku cadang apa pun dari pelat nama gearbox yang akan diganti.

Speeds up the matching process and ensures dimensional compatibility with your garden implement

💡 Tips Profesional: Not sure which model you need? Our selection engineers have cross-referenced thousands of walk-behind tractor gearbox applications. Send us any information you have — even partial — and we will find the right match. Hubungi kami di sini.

Koleksi Gearbox Pertanian

⚙ Fitting Guide: Garden Management Machine / Walk-behind Tractor Gearbox on Your walk-behind tractor

Installing a new gearbox on your garden implement is a straightforward process when done methodically. Allow approximately 1-2 hours for a complete replacement using standard hand tools.

Step 1: Safety Preparation
Ensure the walk-behind tractor is fully supported and cannot roll or tip. Shut down the tractor, remove the key, and disconnect the battery if working near electrical components. Lower all hydraulic implements to the ground. Put on safety gloves, steel-cap boots, and eye protection before beginning any work.
Step 2: Connect PTO Driveline
Oleskan lapisan tipis gemuk litium pada alur poros input. Aktifkan poros penggerak PTO, pastikan alur saling terkait sepenuhnya dan cincin pengaman terkunci pada posisinya. Periksa sudut poros penggerak: ukur dengan inklinometer jika memungkinkan. Sudut di atas 15° memerlukan peningkatan sambungan CV (constant velocity) untuk mencegah kerusakan akibat getaran.
Step 3: Fill With Lubricant
Charge the gearbox with the specified volume and grade of gear oil. Do not overfill — excess oil causes churning, overheating, and seal pressure. Install the fill plug with thread sealant if required. Check that the breather vent is clear and properly installed.
Step 4: Position & Secure New Gearbox
Lift the new Garden Management Machine / Walk-behind Tractor gearbox and slide it onto the mounting flange. Ensure the housing is oriented correctly (check your reference photos from disassembly). Start all mounting bolts by hand before tightening any of them. Apply final torque using a calibrated torque wrench — refer to the torque specification card included with your gearbox.
Step 5: Connect Output to rotor/wheel transmission
Mate the gearbox output to the rotor/wheel transmission input. If using a flanged connection, align the bolt holes and use grade 8.8 or higher fasteners torqued to specification. If keyed or splined, confirm the coupling seats fully before applying locking hardware. Verify zero binding by hand-rotating the assembly.
Step 6: Prepare the Mounting Surface
Thoroughly clean the garden implement’s gearbox mating surface. Remove all rust, paint, and sealant residue. Inspect the mounting face for any damage — dents, cracks, or corrosion that could prevent a flush fit. If mounting studs are used, verify they are tight and undamaged.
Langkah 7: Uji Coba & Pemakaian Awal
Perform an initial low-speed test: engage PTO at half speed for 10 minutes, stop, check for leaks and abnormal heat. If clear, run at full speed for 20 minutes under light load. After the initial test, perform a short field trial under actual garden management conditions at reduced forward speed. Monitor gearbox temperature and sound throughout.
Step 8: Remove Old Gearbox
Separate the PTO driveline and the output connection to the rotor/wheel transmission. Mark the orientation of the gearbox on the frame before removal. Use an appropriate lifting device (the gearbox may be heavier than it looks). Remove mounting bolts working from the outside in, then gently pull the gearbox away from the mounting surface.

⚠ Penting: Jika Anda mengalami kesulitan, tim dukungan teknis kami siap membantu Anda melalui proses tersebut — hubungi kami di sini.

🚧 Symptom-Cause-Fix Guide for Your Garden Management Machine / Walk-behind Tractor Gearbox

Diagnosis cepat menghemat waktu dan uang. Panduan pemecahan masalah ini disusun berdasarkan gejala — temukan masalah yang Anda alami, lalu ikuti tindakan yang disarankan untuk menyelesaikannya.

⚠ Transmisi Terlalu Panas

Analisis Akar Penyebab: Sirip pendingin yang tersumbat kotoran mengurangi pembuangan panas.

Tindakan perbaikan: Panas berlebih adalah penyebab paling umum kerusakan gir. Ambil tindakan segera: kurangi beban, periksa jenis dan level oli yang benar, dan bersihkan permukaan rumah gir. Jika girboks telah beroperasi panas dalam waktu lama, pertimbangkan untuk menguras dan memeriksa oli untuk kontaminasi logam sebelum melanjutkan pengoperasian.

⚠ Kesulitan Menghubungkan Poros PTO ke Kotak Gigi

Analisis Akar Penyebab: Permukaan pengait PTO yang rusak atau aus

Tindakan perbaikan: Pastikan Anda memiliki standar PTO yang benar — poros 540 RPM dan 1000 RPM tidak dapat saling menggantikan. Jika standarnya cocok tetapi dudukan poros tidak terpasang dengan benar, periksa dudukan poros dan alur poros input untuk kerusakan. Satu gigi alur yang bengkok dapat mencegah pemasangan. Bersihkan dan hilangkan gerigi seperlunya.

⚠ Kebocoran Oli dari Segel Poros

Analisis Akar Penyebab: Blocked breather vent preventing pressure relief

Tindakan perbaikan: Identifikasi segel mana yang bocor (masukan, keluaran, atau sambungan rumah). Pastikan level oli tidak melebihi garis pengisian. Ganti tutup ventilasi — ventilasi yang tersumbat adalah penyebab sekitar 401.300 kasus kebocoran segel. Jika segel itu sendiri rusak, pasang segel pengganti dan periksa kondisi poros.

⚠ Poros Keluaran Berhenti Berputar Saat Poros Masukan Berputar

Analisis Akar Penyebab: Pasak atau alur pada poros keluaran rusak

Tindakan perbaikan: Stop the tractor immediately. Do not attempt to force the PTO. Check the shear bolt or slip clutch mechanism — if it has tripped, identify and address the cause of the overload before replacing the bolt. If the protection device has not activated, the gearbox has suffered an internal failure and must be disassembled for inspection.

⚠ Getaran Berlebihan Selama Pengoperasian

Analisis Akar Penyebab: Baut pemasangan yang longgar memungkinkan pergerakan gearbox.

Tindakan perbaikan: Disconnect the PTO and spin the driveline by hand — rough spots or catches indicate U-joint wear. Check gearbox mounting bolt torque. If vibration only occurs under load, the output coupling or rotor/wheel transmission balance may be the cause. If vibration is constant, the driveline is the most probable source.

Remember: early intervention prevents secondary damage. If you detect any unusual behaviour from your Garden Management Machine / Walk-behind Tractor gearbox, address it promptly rather than continuing to operate. Our tim teknis siap membantu mendiagnosis masalah dan mencari suku cadang pengganti dengan cepat.

📝 From the Field: Australian Farmers Review the Garden Management Machine / Walk-behind Tractor Gearbox

Our agricultural gearboxes are field-proven across every Australian state and territory. Below are documented case studies from recent Garden Management Machine / Walk-behind Tractor gearbox installations.

📍 Esperance, WA commercial garden management contractor — 6000 acres

Klien: Sam Tucker | Aplikasi: Garden Management Machine / Walk-behind Tractor gearbox — garden management

Tujuan: Custom ratio requirement for a modified walk-behind tractor not served by standard catalogues

“Fast delivery to a remote location was the initial reason I tried this supplier. The gearbox quality is what made me a repeat customer — we have now standardised on their products across our fleet of 7 walk-behind tractor machines.”

📍 Case #2: Adelaide, SA

Pelanggan: Robert Clarke — specialist walk-behind tractor operator
Lokasi: Adelaide, SA
Ukuran Ladang: 1800 acres
Aplikasi: Garden Management Machine / Walk-behind Tractor gearbox for walk-behind tractor — garden management
Alasan Pembelian: Penggantian darurat di tengah musim setelah kerusakan parah pada gearbox asli.

“Opsi rasio khusus merupakan terobosan besar bagi operasional kami. Kami membutuhkan kecepatan output non-standar yang tidak dapat disediakan oleh pemasok lain. Tim teknik merancang solusi dalam waktu seminggu dan solusi tersebut bekerja dengan sempurna sejak hari pertama.”
Robert Clarke, Adelaide, SA

Ken Yates — Orange, NSW

Operasi: pertanian hortikultura intensif | Ukuran: 5000 acres | Menggunakan: Garden Management Machine / Walk-behind Tractor gearbox for garden management

Alasan pembelian: Peningkatan dari unit aftermarket murah yang hanya bertahan kurang dari satu musim.

“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.”

📍 Sydney, NSW commercial garden management contractor — 600 acres

Klien: Owen Phelps | Aplikasi: Garden Management Machine / Walk-behind Tractor gearbox — garden management

Tujuan: Fleet standardisation — transitioning all walk-behind tractor equipment to a single gearbox supplier

“Yang meyakinkan saya adalah garansi yang komprehensif. Tidak ada pengecualian, tidak ada ketentuan tersembunyi. Ketika saya memiliki pertanyaan tentang suara aneh (ternyata masalahnya ada pada sistem penggerak, bukan transmisi), mereka mendiagnosisnya melalui telepon tanpa biaya.”

📍 Kasus #5: Innisfail, QLD

Pelanggan: Eric Hartley — dryland farming operation
Lokasi: Innisfail, QLD
Ukuran Ladang: 1800 acres
Aplikasi: Garden Management Machine / Walk-behind Tractor gearbox for walk-behind tractor — garden management
Alasan Pembelian: Replace failed OEM gearbox to restore walk-behind tractor for the upcoming season

“Our walk-behind tractor operates in extremely dusty conditions and we were going through gearboxes every season. This one has survived 2 seasons and is still running perfectly. The sealing is clearly superior to what we had before.”
Eric HartleyInnisfail, QLD

❓ Garden Management Machine / Walk-behind Tractor Gearbox FAQ — Everything You Need to Know

What minimum order is needed for volume pricing?

We offer tiered pricing starting from single-unit purchases, with meaningful discounts beginning at 5+ units. Dealer and OEM pricing structures are available for agricultural equipment retailers and walk-behind tractor manufacturers. Contact our sales team for a formal quotation tailored to your volume requirements.

Will this gearbox fit older-model walk-behind tractor equipment?

We maintain compatibility databases covering walk-behind tractor 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.

Oli transmisi jenis apa yang Anda rekomendasikan untuk kondisi di Australia?

Untuk sebagian besar iklim Australia, oli gir SAE 80W-90 EP yang memenuhi spesifikasi GL-5 sangat ideal. Di daerah tropis dengan suhu tinggi yang berkelanjutan, kami merekomendasikan 85W-140. Untuk daerah selatan yang mengalami musim dingin yang sangat dingin, oli sintetis 75W-90 memberikan perlindungan start dingin yang lebih baik. Periksa kartu spesifikasi oli yang disertakan dengan girboks Anda untuk rekomendasi yang pasti.

What documentation ships with the gearbox?

Setiap gearbox dikirimkan dengan: manual instalasi yang berisi spesifikasi torsi, jadwal pelumasan dan perawatan, diagram komponen dengan nomor komponen individual, kartu registrasi garansi, dan sertifikat inspeksi kualitas yang berisi nomor seri unit dan hasil pengujian.

Bagaimana perbandingan girboks Anda dengan unit OEM aslinya?

Girboks kami sesuai atau melampaui spesifikasi OEM di semua parameter yang terukur. Peningkatan utama meliputi kelas bantalan yang ditingkatkan, material segel yang lebih unggul, pembuangan panas yang lebih baik, dan opsi rasio gigi khusus yang tidak ditawarkan oleh katalog OEM. Hasilnya adalah pengganti langsung yang biasanya lebih awet daripada yang asli.

How do I determine the correct gearbox model for my equipment?

Provide us with your tractor brand/model and PTO speed, the walk-behind tractor 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.

Apa saja yang tercakup dalam garansi dan berapa lama masa berlakunya?

Garansi komprehensif 24 bulan kami mencakup semua cacat material dan pengerjaan, termasuk bantalan, roda gigi, segel, dan rumah. Garansi ini berlaku sejak tanggal pembelian dan didukung oleh sistem manajemen mutu bersertifikasi ISO kami. Program garansi diperpanjang tersedia untuk pesanan dalam jumlah besar dan pesanan armada.

Apakah gearbox tersebut cocok untuk digunakan dalam operasi pertanian bersertifikasi organik?

Kotak roda gigi kami adalah komponen mekanis dan tidak mengandung zat apa pun yang dapat memengaruhi sertifikasi organik. Namun, pemilihan pelumas perlu dipertimbangkan — kami dapat merekomendasikan oli roda gigi kelas makanan dan mudah terurai yang kompatibel dengan standar pertanian organik di Australia dan internasional.

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 the gearbox be serviced or rebuilt in the field?

Servis rutin (penggantian oli, penggantian seal, pemeriksaan bantalan) dapat dilakukan di tempat dengan peralatan standar. Untuk perbaikan besar, kami menyediakan kit perbaikan lengkap yang berisi semua bantalan, seal, dan gasket. Manual servis terperinci dan panduan video tersedia untuk diunduh dari portal dukungan kami.

🔧 Complementary Components for Garden Management Equipment

Sistem transmisi daya yang lengkap memberikan hasil yang lebih baik daripada komponen tunggal mana pun. Pertimbangkan penambahan berikut pada sistem Anda. Garden Management Machine / Walk-behind Tractor pengaturan.

PTO Shaft for Garden Management Machine / Walk-behind Tractor

Rakitan Poros Penggerak PTO

Rugged PTO drive shafts built for garden management demands. Standard, wide-angle, and CV joint options. Telescoping tube with nylon liner. Full guard kit included.

Lihat Poros PTO →

Rentang Gearbox Pertanian

Katalog Gearbox Lengkap

Browse our full range of agricultural gearboxes — from mower drives to harvester transmissions. Every unit built to the same premium standards as our Garden Management Machine / Walk-behind Tractor gearbox.

Telusuri Kotak Gigi →

⚖ Safety Standards for Garden Management Machine / Walk-behind Tractor Equipment in Australia

Australian farmers must ensure all agricultural machinery — including walk-behind tractor with PTO-driven gearboxes — meets applicable safety standards. Here is a summary of the requirements relevant to your Garden Management Machine / Walk-behind Tractor gearbox:

Applicable Standards

  • AS/NZS ISO 9001:2015 — Quality Management: Our manufacturing facility holds current certification to the international quality management standard.
  • AGMA 2001 — Gear Tooth Rating: Gear designs validated against AGMA standards for bending strength and pitting resistance.

State-Specific Requirements

  • New South Wales — Work Health and Safety Regulation 2017: requires documented maintenance records for all power-driven walk-behind tractor machinery.
  • Victoria — Peraturan K3 2017: specifies risk assessment requirements for garden management machinery operations.
  • ACT — WHS Regulation 2011: mirrors national standards for agricultural machinery including walk-behind tractor equipment.

Australia-Wide Garden Management Machine / Walk-behind Tractor Gearbox Distribution

Kami mengantarkan Garden Management Machine / Walk-behind Tractor agricultural gearboxes to every state and territory in Australia. Our logistics network covers major farming regions including the Katherine region, the Douglas Daly, and the Top End, the Riverina, the Murrumbidgee Irrigation Area, and the Liverpool Plains, and the Wheatbelt, the Ord River district, and the Great Southern. 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.

🎯 Take the Next Step — Garden Management Machine / Walk-behind Tractor Gearbox Solutions

Pabrik

Trusted Manufacturer — over two decades of in Business

100,000+ units produced annually. ISO 9001 certified. Delivering to more than 45 countries worldwide.

Pembuatan Gearbox Kustom

Standard specifications don’t always fit. Our engineering team designs and manufactures custom gearboxes to your drawings, samples, or specifications. From modified OEM replacements to completely new designs for specialised walk-behind tractor equipment — we handle it all.

Minta Penawaran →
Tentang Kami →

Mitra terpercaya Anda untuk solusi gearbox pertanian — standar dan sesuai pesanan — di seluruh Australia dan dunia.