Boîte de vitesses pour épandeur d'engrais L-25A, rapport 2,78:1, remplaçant la boîte de vitesses Comer L-25A

The L-25A Fertilizer Spreader Gearbox Ratio 2.78:1 Replacement for Comer L-25A Gearbox, also known as a fertilizer distributor gearbox, is an essential power transmission component engineered specifically for chemical fertilizer spreaders and a wide range of agricultural machinery. Positioned at the mechanical heart of the spreader, it receives rotational power directly from the tractor's Power Take-Off (PTO) at up to 540 RPM and converts it via a precise 2.78:1 reducing gear arrangement into the correct output speed and torque for driving spinning discs, agitators, or augers that uniformly distribute granular fertilizer, lime, compost, or seed across croplands and pastures. Weighing just 4.1 kg with an aluminium housing, this fertilizer spreader gearbox combines lightweight portability with industrial-grade durability, making it the ideal direct drop-in replacement for the OEM Comer L-25A unit.

Engineered for consistent performance under demanding field conditions, these fertilizer spreader gearboxes are designed to handle the corrosive chemical environment of fertilizer operation. Sealed bearings, precision-machined bevel gears, and a robust aluminium housing with high-durability oil seals ensure long service life even in wet, dusty, or chemically aggressive environments. With a maximum input power of 14 kW, a maximum output torque of 29 N·m, and dual 25 mm connection shafts, the gearbox integrates seamlessly into centrifugal spreaders used in crop farming, pasture management, lawn care, orchard applications, and landscaping. Maintenance is straightforward: the first oil change is required at 50 to 70 operating hours, with subsequent intervals of up to 500 hours, using SAE 80W-90 gear oil. As a leading agricultural gearbox for fertilizer spreader applications, this unit from CMN Transmission meets the daily operational demands of professional farmers, contractors, and OEM equipment builders worldwide.

Paramètres techniques

Nous avons fait réaliser un audit fournisseur et une vérification d'entreprise par un tiers, avec le soutien de SGS/TÜV Rheinland. Cette vérification permet aux acheteurs d'examiner l'identité de l'entreprise, ses activités, son profil et ses capacités de production. Des rapports d'inspection spécifiques aux produits, des documents relatifs aux matériaux ou des attestations de conformité peuvent être fournis sur demande.

Quantité minimale de commande (MOQ) : Paramétrable de manière flexible en fonction du type de produit et de la quantité commandée.

Exemples : Les nouveaux clients peuvent demander de 1 à 5 échantillons dans certaines circonstances.

Commandes mixtes : La combinaison de différents modèles est prise en charge ; le montant total de la commande doit atteindre environ $1 500.

Petites commandes : Les commandes à partir de 1 ou 2 pièces sont acceptées, mais le prix unitaire sera relativement plus élevé.

Délai de mise en œuvre: 10 à 25 jours ouvrables pour les pièces standard ; 20 à 45 jours ouvrables pour les composants personnalisés ; 45 à 120 jours ouvrables pour les équipements spécifiques à un projet.

Conditions commerciales : Les conditions EXW, FOB, CIF et DAP sont généralement acceptées ; les conditions FCA, CFR, CPT, CIP et DDP peuvent faire l’objet de négociations spécifiques.

Dimensions de la boîte de vitesses de l'épandeur d'engrais L-25A

Key Features of the L-25A Fertilizer Spreader Gearbox 2.78:1

1. Interface de prise de force et compatibilité des cannelures
The input shaft is machined to match the standard 1" 3/8 Z6 six-spline profile used across virtually all modern tractor PTO outputs operating at 540 RPM, ensuring a direct, tool-free engagement with existing PTO drivelines. Correct spline geometry is critical: even minor dimensional mismatches cause vibration, premature bearing wear, and eventual shaft failure. The L-25A's precision-cut spline profile guarantees zero play and full torque transmission from the moment of installation, protecting the driveline and the spreader mechanism from the cyclic stress that develops when shaft alignment is compromised.

2. Precise Gear Ratio and Output Configuration
The 2.78:1 reduction ratio is carefully selected to translate 540 RPM tractor PTO speed into approximately 194 RPM at the output shaft, delivering the precise disc rotational speed required for optimal fertilizer throw pattern on centrifugal spreaders. Both connection diameters are standardised at 25 mm, enabling compatibility with a variety of disc mounts, single-disc configurations, and spreader agitator attachments. The fertilizer spreader gearbox ratio of 2.78:1 is engineered to produce the correct balance between spreading width and application density for granular materials including NPK fertilizers, urea, ammonium nitrate, lime, and pelleted compost.

3. Construction en aluminium résistant à la corrosion
Chemical fertilizers including ammonium nitrate, urea, and potassium chloride are highly corrosive to ferrous metals and many plastics. The L-25A's die-cast aluminium housing resists chemical attack while saving significant weight compared to cast iron equivalents. Internal gear surfaces receive precision surface treatments to withstand corrosive oil contamination, and all sealing points use high-durability elastomeric oil seals rated for fertilizer-environment duty. Sealed, grease-packed bearings eliminate the risk of fertilizer ingress into the bearing races, which is a primary failure mode in unprotected agricultural gearboxes operating in dusty or wet spreading conditions.

4. Intégration de l'agitateur et du lecteur de disque
The dual-output shaft configuration on the L-25A with two 25 mm connection points makes it adaptable for spreader designs that require simultaneous operation of both the main spreading disc and an agitator mechanism. Agitators prevent material bridging in the hopper, which is a common operational problem with hygroscopic fertilizers such as urea and ammonium nitrate that absorb moisture and cake together in humid field conditions. By supporting both the disc drive and agitator from a single compact gearbox, the L-25A reduces mechanical complexity and eliminates the need for secondary drive chains or belt arrangements, resulting in a cleaner, lower-maintenance drivetrain layout.

5. Field Serviceability and Accessible Maintenance
Routine lubrication and inspection have been designed to be achievable without removing the gearbox from the spreader frame. The oil fill and drain plugs are positioned for easy wrench access in typical spreader mounting positions, and the 0.35 L oil capacity keeps fill operations quick and mess-free. The prescribed 500-hour oil change interval aligns conveniently with annual seasonal schedules for most commercial spreading operations. The fertilizer spreader gearbox oil level can be checked visually without tools by locating the level plug on the housing wall. Breather venting prevents internal pressure buildup that would otherwise force lubricant past seals, a detail that significantly contributes to the gearbox's long-term oil seal integrity when used across multiple seasons.

6. Verified OEM-Quality Manufacturing Standards
Every CMN L-25A agricultural gearbox is manufactured under ISO 9001 quality management protocols at CMN Transmission's Korea facility, with CE marking confirming compliance with European machinery directive requirements. Gear tooth profiles, shaft tolerances, and bearing fits are held to tighter-than-catalogue limits to ensure consistent, repeatable performance across production batches. This level of process control is what distinguishes CMN's fertilizer spreader gearbox parts from generic aftermarket copies that may replicate external dimensions while using inferior gear steel grades or substandard heat treatment processes.

Principe de fonctionnement

The operating cycle begins at the tractor's rear PTO stub shaft, which rotates at 540 RPM under the standard European and North American agricultural convention. A telescopic PTO driveshaft with universal joints transmits this rotational energy forward to the L-25A gearbox's input spline. The 1" 3/8 Z6 spline profile on the input shaft engages the PTO shaft yoke with zero backlash, transferring full torque without slippage, vibration damping, or power loss at the interface. This direct mechanical connection ensures that 100 percent of the available PTO torque reaches the gearbox's internal gear train from the moment the PTO lever is engaged on the tractor.

Inside the aluminium housing, precision-cut bevel gears perform the core mechanical function of the gearbox: translating the 540 RPM, low-torque input from the PTO into a reduced-speed, higher-torque output. The 2.78:1 gear ratio means the output shaft turns at approximately 194 RPM for every 540 RPM at the input, while output torque increases proportionally minus frictional losses. The bevel gear arrangement redirects the rotational axis by 90 degrees, changing the power transmission direction from the longitudinal PTO axis to the transverse or vertical axis required to drive the spreader disc. This axis change is fundamental to the mechanical layout of centrifugal fertilizer spreaders, where the disc must spin in a horizontal plane while the PTO shaft is oriented longitudinally behind the tractor.

The output shaft exits the gearbox at the correct speed and torque to drive one or both spinning discs of the fertilizer spreader. Granular fertilizer falls by gravity from the hopper onto the spinning disc vanes, which impart centrifugal acceleration to each granule and project it outward in a controlled arc. The width and distribution pattern of the spread swath is determined by disc speed, vane angle, and the physical properties of the fertilizer material. At the rated 2.78:1 ratio, the L-25A delivers the disc RPM range specified by most European centrifugal spreader manufacturers for medium-spread-width granular fertilizer application, typically covering swath widths of 12 to 24 metres depending on machine setup.

The gearbox's internal components operate in a bath of SAE 80W-90 gear oil, which simultaneously lubricates gear tooth contact zones, shaft bearings, and oil seal running surfaces. The viscosity grade 80W-90 is selected to provide adequate film strength at the gear tooth contact pressures generated during maximum-power operation while remaining fluid enough at typical field operating temperatures to reach all internal surfaces by splash lubrication within seconds of startup. The aluminium housing conducts heat away from internal components efficiently, preventing the localised hotspots that can degrade lubricant quality and cause premature gear surface fatigue. Proper oil level maintenance is essential: operating the fertilizer spreader gearbox with insufficient oil accelerates wear dramatically, which is why the first oil change at 50 to 70 hours removes any manufacturing debris, and subsequent 500-hour intervals maintain oil quality within service limits.

While the L-25A gearbox itself is rated to handle the continuous torque demands of normal spreading operation, the complete spreader driveline is typically protected by a slip clutch or shear bolt device located in the PTO driveshaft assembly. When the spreader disc strikes a solid obstacle or jams with caked material, these overload protection devices interrupt torque transmission before gearbox internals or the tractor PTO shaft are overloaded. The gearbox is designed to operate continuously at rated load when the overload device is correctly set, providing reliable, consistent power delivery throughout extended spreading sessions without requiring operator intervention or mid-session adjustments to maintain even application rates across the field.

Applications des boîtes de vitesses des épandeurs d'engrais

L-25A Gearbox Manufacturing Process

1. Raw Material Inspection and Selection
Every production batch begins with incoming material verification. Alloy steel billets for gear and shaft production are spectrographically tested to confirm chemical composition matches the specified grade for case-hardening response. Aluminium alloy ingots for housing die casting are similarly verified for alloy grade and impurity content. Material certifications from accredited steel mills are retained and linked to production batch records, enabling full traceability of any component back to its source material lot. This first-stage quality gate prevents substandard material from entering the machining process and reaching finished products.

2. Housing Die Casting and Precision Machining
Aluminium housings are pressure die-cast in hardened steel dies to produce near-net-shape castings with consistent wall thickness, port locations, and external geometry. Following casting, each housing is transferred to CNC machining centres for the precision operations that create bearing bores, shaft passages, oil plug threads, and mounting flange surfaces. Bore diameters and positional tolerances for bearing locations are held to tighter-than-standard limits to ensure correct bevel gear mesh geometry during assembly. Surface roughness specifications on sealing surfaces prevent oil seal leakage at shaft exits. Completed castings undergo dimensional verification using coordinate measuring machines before progression to assembly.

3. Gear Cutting and Heat Treatment
Bevel gears are roughed on dedicated gear cutting machines and then finished by grinding to final tooth profile geometry. Pitch, pressure angle, lead, and tooth thickness are verified by gear measurement machines to ensure correct mesh geometry in the assembled gearbox. Following profile finishing, gears undergo case hardening heat treatment in controlled-atmosphere furnaces to develop the combination of hard, wear-resistant tooth surface and tough, impact-resistant core structure required for agricultural gearbox duty. Post-hardening, gear distortion from heat treatment is corrected by final profile grinding. Input and output shafts undergo similar turning, milling, and surface hardening operations on their spline and bearing journal surfaces before inspection.

4. Component Sub-Assembly and Bearing Installation
Gear shaft sub-assemblies are built up by pressing bearings, seals, and spacers onto machined shafts in the correct sequence before installation into the housing. Bearing press fits are dimensionally controlled to achieve the interference that prevents bearing rotation on the shaft without introducing excessive hoop stress that could fracture the bearing outer ring. Oil seals are pressed into housing bores using purpose-made tooling that applies even force across the seal body without distorting the seal lip or misaligning the seal axis. All sub-assembly operations are performed on clean, temperature-controlled benches to prevent contamination of bearing raceways and sealing surfaces before housing closure.

5. Gearbox Assembly and Gear Mesh Setting
Complete gearbox assembly is the most technically demanding production stage. Shaft and gear sub-assemblies are installed into the housing, and the bevel gear mesh is set by adjusting shim thickness at the bearing cap locations to achieve the specified tooth contact pattern and gear backlash. Contact pattern is verified using marking compound applied to the gear teeth and rotating the assembly under light load to transfer the contact footprint onto the tooth surface. Correct contact position and footprint shape are prerequisites for quiet operation and rated service life. Out-of-specification contact patterns are corrected by shim adjustment before housing cover installation. Torque plug tightening sequences are specified to prevent housing distortion and ensure consistent joint clamping across the assembly population.

6. Run-in Testing and Performance Verification
Assembled gearboxes are run on test benches under no-load and progressively loaded conditions to verify smooth rotation, correct bearing preload, absence of abnormal noise, and effective sealing at all shaft exits. Input and output shaft rotational speeds are verified against ratio specification using optical tachometers. Oil temperature rise is monitored during extended test runs to confirm that lubrication is reaching all internal surfaces without localised hot spots. Any gearbox exhibiting noise beyond the specification limit, oil seepage, or non-compliant ratio is rejected for root cause investigation and rework before re-test. Only units passing full test criteria proceed to packaging and shipment as certified fertilizer spreader gearbox parts.

7. Surface Treatment and Corrosion Protection
External exposed surfaces of shafts, plugs, and fasteners are treated with corrosion-resistant coatings appropriate to the fertilizer spreading operating environment. Aluminium housing surfaces may be anodised or painted with chemical-resistant coatings to resist the mild acid or alkali attack of fertilizer residues that accumulate on the spreader gearbox during normal operation. Internal gear and shaft surfaces receive their corrosion protection from the SAE 80W-90 oil charge, which also serves as the assembly corrosion inhibitor during the storage and transit period before first installation. Completed, sealed gearboxes are packaged with end-cap protection on all shaft stubs to prevent transit damage to precision-machined surfaces during handling and shipping.

How to Correctly Replace the L-25A Fertilizer Spreader Gearbox

1. Safety Isolation and Spreader Preparation
Before commencing any gearbox replacement work, disconnect the PTO driveshaft from the tractor, lower the spreader to the ground, and engage the tractor's park brake. Allow the gearbox to cool if it has been recently operated, as the aluminium housing can reach temperatures that cause burns on contact. Empty the fertilizer hopper completely and wash the spreader to remove all fertilizer residue, protecting both the person performing the replacement and any tools or components from chemical contamination. Photograph the existing gearbox installation from multiple angles before disassembly to record the correct orientation, cable routing, and any shims or spacers in the original installation that must be replicated on the replacement unit.

2. Oil Drainage from the Old Gearbox
Place a suitable drain tray beneath the existing gearbox and remove the drain plug to allow full drainage of the old lubricant. Dispose of used gear oil responsibly in accordance with local environmental regulations, as SAE 80W-90 gear oil is classified as a controlled waste in most jurisdictions. Inspect the drained oil for signs of metal particles, water emulsion, or a milky appearance that indicates seal failure and water ingress, which may suggest that additional components such as bearings or seals on the spreader shaft may need attention at the same service opportunity. Clean the drain plug threads and inspect the plug's sealing washer condition before setting the plug aside.

3. Removal of the Spreader Disc and Output Connections
Before removing the gearbox from the spreader frame, disconnect the output shaft connection to the spreader disc hub. This typically involves removing a retaining bolt, nut, or snap ring at the disc hub centre, and then pulling the disc assembly free from the output shaft. Take note of any shims, spacers, or washers between the disc hub and the gearbox housing face, as these must be reinstalled in the same position on the replacement unit to maintain correct axial positioning of the disc relative to the hopper outlet. Support the disc during removal to avoid dropping it, as disc vane edges are sharp and the disc assembly is heavier than it appears.

4. Gearbox Unbolting and Removal from Frame
The gearbox mounting flange is secured to the spreader frame by four bolts through the O11 mm bolt hole pattern. Remove these four bolts and retain the original hardware for reuse with the replacement gearbox, verifying that thread condition and washer integrity are satisfactory. Lift the old gearbox clear of the frame mounting pad, taking care to catch any alignment dowels or anti-rotation pins that may be present in the mounting interface. Inspect the frame mounting surface for corrosion, warping, or cracking that could affect the seating of the replacement gearbox. Clean the mounting surface thoroughly to ensure the replacement unit sits flat without rocking, which is essential for maintaining correct output shaft alignment with the disc hub.

5. New Gearbox Installation and Torquing
Position the CMN L-25A replacement gearbox on the cleaned mounting pad with the output shaft oriented correctly to engage the disc hub and the input spline pointing toward the PTO driveshaft. Install the four mounting bolts finger-tight first, verifying that the gearbox sits flat on the frame surface without any rocking movement that would indicate a mounting surface irregularity. Torque the four mounting bolts to the spreader manufacturer's specification in a diagonal cross pattern to achieve even clamping force distribution across the mounting flange. Do not use impact wrenches at full power on aluminium housing flanges, as thread stripping in the housing wall is a risk if torque is applied rapidly without control. Refit any alignment dowels removed during disassembly.

6. Oil Fill, Disc Reconnection, and Pre-Start Checks
Fill the new gearbox with exactly 0.35 L of SAE 80W-90 gear oil through the fill plug, then check the oil level at the level plug to confirm correct quantity. The gearbox is supplied dry from the factory and must be filled before first operation; running even briefly without oil will cause irreversible gear and bearing damage. Reinstall the disc assembly on the output shaft with the original shims in their correct positions, and secure the disc retaining fastener to specification torque. Reconnect the PTO driveshaft and verify that all guards are correctly installed and secured. Engage the PTO at low engine speed for the first 15 minutes of initial operation, checking for abnormal noise, vibration, or oil seepage before returning to full operational workload. Log the first oil change reminder at 50 to 70 hours from first use.

Comment choisir la boîte de vitesses agricole adaptée à un épandeur d'engrais

Boîte de vitesses d'épandeur d'engrais et arbre de prise de force agricole

The Power Take-Off (PTO) shaft is the mechanical bridge between the tractor's engine gearbox output and any implement mounted or towed behind the tractor. In the vast majority of agricultural tractors worldwide, the PTO stub shaft protrudes from the rear of the tractor gearbox housing and rotates at either 540 RPM or 1000 RPM depending on the tractor's operating speed and the selected PTO engagement mode. The 540 RPM standard is by far the most widely used for light to medium implements including fertilizer spreaders, mowers, and tillers, while 1000 RPM is reserved for higher-power implements requiring faster input speeds.

The PTO driveshaft assembly that connects the tractor stub shaft to the implement input gearbox consists of a telescopic central shaft that accommodates variations in the distance between tractor and implement during operation and turning, combined with universal joint assemblies at each end that transmit torque through angular misalignment between the tractor and implement when operating on uneven ground or during headland turns. These universal joints are the most maintenance-intensive components in the fertilizer spreader driveline, requiring regular greasing and periodic inspection for worn bearing cups, cracked yokes, and damaged safety guards.

The fertilizer spreader gearbox receives its power input exclusively from the PTO driveshaft. The driveshaft's implement-end yoke engages the gearbox input spline, locking the two components in rotational synchrony so that every revolution of the tractor PTO stub produces exactly one revolution at the gearbox input shaft. The gearbox then applies its 2.78:1 gear reduction, delivering 194 RPM output for every 540 RPM input, simultaneously redirecting the power axis from longitudinal to the orientation required to drive the spreader disc. This coordinated system means that the operator controls disc speed indirectly by adjusting tractor engine RPM or PTO engagement state, and controls application rate by varying both travel speed and hopper outlet opening area. The PTO shaft guard must be correctly installed and secured before operating the spreader to comply with machinery safety legislation in all jurisdictions where CMN's fertilizer spreader gearbox products are sold and used.

The L-25A fertilizer spreader gearbox is designed for the 1" 3/8 inch six-spline (Z6) PTO connection that is standard on tractors operating at 540 RPM. When sourcing a replacement PTO driveshaft to use with the CMN L-25A, the implement-end yoke must match the gearbox's 1" 3/8 Z6 input spline profile precisely. Mismatched spline profiles create fretting corrosion at the engagement interface, generating metal particles that contaminate the surrounding area and eventually cause spline tooth stripping under load. Always measure the existing implement-end yoke bore profile before purchasing a replacement driveshaft if the original driveshaft is being replaced at the same time as the gearbox.

The telescopic PTO driveshaft must be correctly sized for the tractor-to-implement distance measured at both maximum extension (when the tractor is fully reversed against the implement) and minimum compression (when the implement is at its closest approach during field operation). An incorrectly short shaft can bottom out and push the gearbox sideways under load, while an excessively long shaft may not telescope far enough to accommodate the tractor's turning radius and will transmit the resultant bending moment as a destructive side load on the gearbox input shaft bearing. CMN recommends that customers replacing both the gearbox and PTO driveshaft simultaneously have the shaft length measured and set by a qualified agricultural machinery dealer familiar with the specific tractor and spreader combination being serviced.

Between the PTO driveshaft and the fertilizer spreader gearbox input, most properly configured spreader drivelines include either a slip clutch or shear bolt overload protection device. This protection device is critically important for the longevity of the L-25A gearbox: when the spreader disc is suddenly stopped by a foreign object or caked fertilizer blockage, the overload device absorbs or releases the sudden torque spike before it reaches the gearbox gear teeth. Without overload protection, a single severe jam can fracture gear teeth, destroy bearings, or crack the housing on any agricultural gearbox for fertilizer spreader applications.

Pourquoi choisir les boîtes de vitesses pour épandeurs d'engrais de CMN Transmission ?

Korea CMN Transmission Co., Ltd. was established in 2000 and is headquartered in Sandan-o, Danwon-gu, Ansan-si, Gyeonggi-do, Korea. Since our founding in 2000, CMN Transmission has focused exclusively on the research, development, manufacturing, and global distribution of agricultural gearboxes. This singular focus means our engineering team has accumulated over two decades of application-specific knowledge in fertilizer spreader gearbox design, materials science, and failure mode analysis that generalist transmission manufacturers simply cannot replicate. Every product improvement we implement is driven by real field data from our global customer base across 60-plus export destinations. With more than 500,000 agricultural gearbox units produced annually at our Korea manufacturing facility with over 100 factory employees, CMN Transmission has the production scale to deliver consistently high quality across large volume orders while maintaining the process discipline that smaller production volumes cannot sustain. Our production volume also drives the investment in precision CNC machining equipment, gear measurement systems, and test bench infrastructure that underpins our product quality.

Beyond fertilizer spreader gearboxes, CMN's product catalogue covers rotary cutter gearboxes, rotary tiller gearboxes, feed mixer gearboxes, rotary mower gearboxes, flail mower gearboxes, post hole digger gearboxes, round baler gearboxes, square baler gearboxes, disc mower gearboxes, center pivot irrigation gearboxes, hydraulic drive gearboxes, silage machine gearboxes, orchard sprayer gearboxes, rotary rake gearboxes, combine harvester gearboxes, grain storage gearboxes, corn headers gearboxes, cutting bar gearboxes, and poultry feeding gearboxes, with custom agricultural gearbox solutions covering nearly one thousand specifications. This breadth allows distributor and OEM customers to consolidate their agricultural gearbox sourcing with a single, qualified supplier.

CMN Transmission exports to the United States, Canada, Mexico, Brazil, Argentina, France, Germany, Italy, Spain, the United Kingdom, Russia, China, India, Thailand, Vietnam, Turkey, Australia, New Zealand, and many additional markets worldwide. This global reach is supported by established logistics partnerships that ensure competitive shipping times, correct customs documentation, and appropriate packaging for long-haul container transport. Our international experience means we understand the import requirements, technical standards, and commercial expectations of customers across all major agricultural markets. CMN Transmission holds CE, ISO 9001 Quality Management System, Environmental Management, and Occupational Health and Safety certifications. These independently audited certifications validate our manufacturing processes, quality control systems, environmental responsibility practices, and workplace safety standards. For OEM and distributor customers, CMN's certification portfolio provides the documented quality assurance required to qualify CMN as an approved supplier in corporate procurement programmes and supports CE marking declarations for European market equipment.

CMN's in-house engineering team provides technical support for application selection, compatibility verification, and custom gearbox development for OEM customers building new spreader models or upgrading existing machinery. Our R and D capability extends to FEA analysis of housing and gear designs, gear ratio optimisation for non-standard PTO speeds, and custom shaft configuration development for unique spreader layouts. Customers seeking a fertilizer spreader gearbox manufacturer capable of supporting product development from specification through production should contact CMN to discuss their project requirements.

Foire aux questions

Q : La boîte de vitesses CMN L-25A remplace-t-elle directement la boîte de vitesses Comer L-25A ?
A: Yes. The CMN L-25A Fertilizer Spreader Gearbox is a verified direct replacement for the Comer L-25A (Comer Code 124.8 series). It replicates the Comer unit's 2.78:1 gear ratio, 1" 3/8 Z6 input spline, 25 mm output shaft diameters, four-bolt mounting flange with O11 mm hole pattern, and overall housing envelope dimensions. No frame modification or adapter brackets are required for a direct bolt-on swap on spreaders originally equipped with the Comer L-25A gearbox.

Q : Quelle huile dois-je utiliser dans la boîte de vitesses de l'épandeur d'engrais L-25A ?
A: The L-25A requires SAE 80W-90 mineral or synthetic gear oil. The housing holds 0.35 L. Fill through the fill plug on the housing top surface until oil flows from the level plug port, then reinstall both plugs. Do not use multi-grade engine oil or ATF fluid, as these do not provide the extreme pressure additive film required for bevel gear operation. The first oil change is due at 50 to 70 operating hours to remove metallic run-in particles from initial gear surface bedding. Subsequent changes at 500 hours or annually. Checking the fertilizer spreader gearbox oil level at the start of each spreading season takes less than two minutes and is the single most effective maintenance action for maximising gearbox service life.

Q: What is the correct fertilizer spreader gearbox ratio for a centrifugal disc spreader?
A: For standard centrifugal spreaders operating at 540 RPM PTO speed, the 2.78:1 ratio in the L-25A produces approximately 194 RPM output, which is within the typical disc speed range for medium to wide swath spreading with granular fertilizers. Different fertilizer spreader gearbox ratio options exist for applications requiring higher or lower disc speeds. If you are replacing a gearbox on an existing spreader, match the ratio of the original unit. If specifying a gearbox for a new spreader build, consult the disc and hopper manufacturer's recommended disc RPM specification and work back from the tractor's PTO speed to identify the required gear ratio.

Q: How do I check the fertilizer spreader gearbox oil level correctly?
A: Checking the fertilizer spreader gearbox oil level on the L-25A requires the spreader to be on level ground. Remove the level plug on the side of the housing. If oil flows out or is visible at the plug aperture, the level is correct. If the cavity behind the level plug is dry, the oil level is low and oil must be added through the fill plug on the housing top until oil appears at the level plug hole. Always re-install and tighten both plugs before operating the gearbox. A routine level check at the start of each spreading day during peak season takes less than one minute and ensures that oil seal leakage is detected before internal damage occurs.

Q: Can I use the L-25A gearbox with a 1000 RPM PTO tractor?
A: The L-25A is rated for a maximum input rotation speed of 540 RPM and is designed specifically for 540 RPM PTO tractors. Operating the gearbox from a 1000 RPM PTO would increase internal component speeds and oil churning losses beyond the design envelope, potentially causing overheating, seal failure, and gear damage. If your tractor only has a 1000 RPM PTO output, contact CMN Transmission's technical team to identify the appropriate gearbox variant for your specific input speed. For power requirements at non-standard RPM values, CMN can advise on compatible agricultural gearbox options or custom configurations.

Q: What fertilizer spreader gearbox parts are commonly replaced during service?
A: The most frequently serviced fertilizer spreader gearbox parts are the oil seals on the input and output shaft exits, which should be inspected for weeping at each oil change and replaced at the first sign of seeping lubricant. Bearings are the next highest-wear items and typically last several thousand operating hours under correct lubrication conditions, but should be replaced proactively at the first sign of increased running noise or radial play at the shaft. Bevel gears themselves rarely fail in correctly lubricated gearboxes but are vulnerable to accelerated wear from low-oil operation, contaminated oil, or incorrect gear mesh from worn bearings. CMN supplies service kits containing matched oil seals and bearings for the L-25A series.

Q: Which spreader brands and models is the CMN L-25A compatible with?
A: The L-25A is compatible with any fertilizer spreader that was originally built with the Comer L-25A gearbox, including models from spreader manufacturers including Vicon, Amazone, Kverneland, Sulky, Bogballe, Rauch, and numerous other European and North American OEM spreader brands that specify the Comer L-25A as an installed or replacement component. Compatibility verification should always be confirmed against the specific spreader serial number and original parts list before ordering, as some spreader models have been updated with different gearbox variants across production years. CMN's technical support team can assist with compatibility queries if you provide the spreader model, year, and original Comer part number from your service documentation.

Q: Is this fertiliser spreader gearbox CE certified?
A: Yes. CMN Transmission holds CE certification for its agricultural gearbox product range, confirming conformity with applicable European machinery directive and safety requirements. CE documentation is available on request for customers importing into European Union member states or other CE-recognition markets. CMN Transmission's manufacturing facility also operates under ISO 9001 quality management system certification, Environmental Management certification, and Occupational Health and Safety certification. These certifications are maintained through regular third-party audit and apply across the full range of CMN's fertilizer spreader gearbox and other agricultural gearbox products.

Q: What are the correct L-25A gearbox mounting dimensions?
A: Based on the Comer L-25J / L-25A Code 124.8 technical drawing, the key mounting dimensions are: overall housing width 75 mm, housing height 113.5 mm, X-Y shaft centre span 148 mm, four mounting bolt holes at N.4 x O11 mm diameter on a 45 mm x 45 mm bolt pitch pattern, mounting shaft centres at 74 mm x 74 mm from housing centreline, and output shaft (Z) outside diameter 25 mm. Input shaft is 1" 3/8 Z6 standard spline. Total weight 4.1 kg. For the full certified dimensional drawing of the CMN L-25A, contact CMN Transmission's technical sales team with your application details.

Q: Can I order the L-25A gearbox in bulk for OEM or distributor supply?
A: Yes. CMN Transmission is a major fertilizer spreader gearbox manufacturer with annual production exceeding 500,000 units across its full agricultural gearbox range, making us one of the few suppliers with genuine volume production capacity for OEM and distribution customers. We supply fertilizer spreader suppliers, equipment OEMs, and agricultural parts distributors in more than 60 countries worldwide. OEM customers can request custom labelling, specific packaging formats, technical documentation support, and direct-from-factory container shipment. Contact CMN's international sales team to discuss MOQ, pricing, lead times, and customisation options for your specific fertilizer spreader gearbox for sale programme.

Avis clients

Alejandro, Agriculture, Argentine
"We farm about 1,200 hectares of wheat and corn in the Pampas and run four centrifugal spreaders through our fertilizer program each season. Two of the original Comer gearboxes were leaking oil and one was making a grinding noise, so we ordered three CMN L-25A units mid-season. They arrived in Buenos Aires in good shape; the spline fit was exact on all three machines, and we swapped them all out in a single afternoon. Did the first oil change at 62 hours as instructed and the oil came out clean with zero metal particles. We are now at 280 hours on these units and they are still running smooth. Very impressed with the build quality for the price."

James, Crop Farming, United Kingdom
"I run a 400-acre arable farm in Lincolnshire and had a Vicon Rotaflow spreader that needed a new gearbox after the original failed at the output shaft bearing. Found CMN through a Google search and took a chance on the L-25A. Honestly it was the right call. Arrived in four days, the dimensions were spot-on for the Comer original, and the quality of the machining looked very professional when I opened the box. The aluminium housing is noticeably thicker than some cheaper copies I have seen. Been spreading ammonium nitrate and triple super phosphate with it for two seasons now, no leaks, no noise. Would order again without hesitation."

Klaus, Gestion des pâturages, Allemagne
"We operate a large farm in Bavaria and use three centrifugal spreaders for our liming and fertilizing programs. We ordered the CMN L-25A gearboxes as replacements for our old Comer units and were amazed at how good the quality is. Delivery to Munich took nine days, everything was neatly packaged, and nothing was damaged. We now have two gearboxes in operation for over 400 operating hours; they run quietly and are leak-proof. Customer service also helped us quickly when we had a technical question about the oil filling. Highly recommended."

Craig, Sugar Cane Farming, Australia
"I operate an agricultural contracting business in Queensland and we use fertilizer spreaders on sugar cane and sorghum properties across about 6,000 acres each season. We ordered two L-25A gearboxes after one of our original units cracked its housing on a rock strike. The CMN units shipped from Korea and arrived in Brisbane in 12 days, which was fine for our planning window. Both fit straight onto our Kuhn spreader frames without any modification. We have had one of the units through a full cane fertilizing season now, spreading urea and humates in humid tropical conditions, and it has not missed a beat. The oil seals have held up perfectly in conditions that used to eat cheaper gearboxes alive."

Jean-Pierre, Vineyard Maintenance, France
"We manage several vineyards in the Bordeaux region and use compact spreaders for fertilizing our vines. I ordered two CMN L-25A gearboxes after the original Comer units started leaking oil after six seasons. The manufacturing quality is good, and the installation was simple thanks to the provided documentation. The only negative point is that the delivery time was 14 days, which delayed us a bit during the spring fertilization period. But the quality of the product itself is truly satisfying. The gearboxes run silently, and the distribution is uniform just like the originals."

Nguyen Van, Rice and Vegetable, Vietnam
"We grow rice and vegetables across 800 acres in the Mekong Delta and started using centrifugal spreaders for our fertilizer program two seasons ago. When we needed a replacement gearbox for the Comer-equipped machine we bought second-hand, a friend recommended CMN Transmission. The price was good, the communication with the sales team was easy in English, and the gearbox arrived in Ho Chi Minh City within 10 days. The 2.78:1 ratio gives us exactly the disc speed we need for our DAP and urea blends. We are very happy and have already recommended CMN to two neighboring farms who also need fertilizer spreader gearboxes."

Michael, Golf Course Turf Maintenance, Canada
"I manage turf care for three golf courses in Ontario and we use a compact tractor-mounted spreader for our seasonal fertilizer programs. The original gearbox on our Vicon spreader finally gave out after eight years, and we were quoted an absurd price for an OEM replacement. CMN's L-25A came in at a fraction of that cost and looks absolutely identical in construction quality. I was honestly a bit skeptical but the proof is in the results - the spread pattern on our fairways is completely uniform, the gearbox is quiet in operation, and after one full season of use including winter applications of sand and fertilizer blends, there is zero sign of wear or leakage. Shipping to Toronto was faster than expected too."

Rajesh, Grain Farming, India
"Our grain farming cooperative in Madhya Pradesh recently bought five fertilizer spreaders for our member farms and needed replacement gearboxes for two machines that came with worn units. The CMN team was excellent in responding to our technical queries and confirmed the L-25A was the correct match for our spreaders before we placed the order. The five units arrived well packaged with no damage and the installation was straightforward. We have been using them for the rabi and kharif fertilizer applications and the build quality is noticeably better than similar products we previously tried from other suppliers. The oil seal quality in particular is much better and we have had no leaks despite dusty operating conditions."

Antonio, Crop Farming, Spain
"We farm about 3,000 hectares of cereal in Castilla y Leon and use several fertilizer spreaders during the season. We needed to replace two L-25A gearboxes because the original ones had many hours on them. The ordering process was simple, and the sales team was very attentive in answering my questions about whether the gearbox was compatible with our machine. The shipment arrived in eight business days, well packaged. Installation was fast because the measurements perfectly match the original Comer ones. We have already logged over 200 hours with the two new units and have not had any issues. Good product, good service."