L-25A Fertilizer Spreader Gearbox Ratio 1:1 Replacement for Comer L-25A Gearbox
The L-25A Fertilizer Spreader Gearbox Ratio 1:1, a certified replacement for the Comer L-25A, is a high-performance agricultural gearbox engineered as the mechanical heart of modern fertilizer spreading machines. Also referred to as a fertilizer distributor gearbox, this unit is centrally mounted within the spreader chassis and transmits power from the tractor’s PTO shaft directly to the spinning discs or augers responsible for even nutrient distribution across fields. With a maximum input power of 11 kW (15 HP output) and a rated speed of 540 r/min, it delivers stable, consistent torque in 1:1 ratio, making it ideal for uniform spreading operations without speed loss or gain. The precision-machined internal bevel gears and high-strength shafts ensure dependable power transfer under the full range of field conditions encountered in modern crop production.
The L-25A Fertilizer Spreader Gearbox Ratio 1:1, a certified replacement for the Comer L-25A, is a high-performance agricultural gearbox engineered as the mechanical heart of modern fertilizer spreading machines. Also referred to as a fertilizer distributor gearbox, this unit is centrally mounted within the spreader chassis and transmits power from the tractor's PTO shaft directly to the spinning discs or augers responsible for even nutrient distribution across fields. With a maximum input power of 11 kW (15 HP output) and a rated speed of 540 r/min, it delivers stable, consistent torque in 1:1 ratio, making it ideal for uniform spreading operations without speed loss or gain. The precision-machined internal bevel gears and high-strength shafts ensure dependable power transfer under the full range of field conditions encountered in modern crop production.
This fertilizer spreader gearbox is equally suited to chemical fertiliser spreaders, mowers, and band saws, showcasing its versatility beyond standard granular spreading. The lightweight aluminium housing (total weight: 4.1 kg) minimises machine load while improving corrosion resistance against fertilizer dust and agrochemical splash. Designed with serviceability in mind, it uses SAE 80W-90 gear oil (max capacity: 0.35 L), with the first oil change recommended after 50 operating hours and then every 500 hours thereafter. For farms, agricultural contractors, OEMs, and distributors seeking reliable fertilizer spreader gearbox parts with a proven track record, the CMN L-25A stands as a direct drop-in solution with zero compromise on performance.
Technical Parameters
| Model | L-25A Gearbox 1:1 |
| Replace Brand | Comer |
| Product details |
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| Application range |
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| Long description |
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| Ratio factor | 1:1 |
| Connection 1 outside diameter | 25.00 mm |
| Connection 2 Outside Diameter inch and splines | 1.3/8-6 |
| Model | L-25A |
| Max. input power | 11 kW |
| Max. input rotation speed | 540 r/min |
| Max. output power | 15 HP |
| Max. output torque | 18.9 nm |
| Gear arrangement increasing | 1-2 |
| Gear arrangement reducing | 1-2 |
| Contains oil | No |
| Max. oil capacity | 0,35 l |
| Max. oil change interval | 500 h |
| Oil SAE viscosity grade | 80W-90 |
| Housing material | Aluminium |
| Weight | 4.1 kg |
We have completed a third-party supplier audit and company verification supported by SGS / TÜV Rheinland. This verification helps buyers review company identity, business operations, supplier profile and general manufacturing capability. Product-specific inspection reports, material documents or compliance records can be provided according to order requirements.
Minimum Order Quantity (MOQ): Flexibly set based on the product type and order amount.
Samples: New customers may request 1–5 samples under appropriate circumstances.
Mixed Orders: Combining different models is supported; the total order amount must reach approximately $1,500.
Small Orders: Orders starting from 1–2 pieces are supported, but the unit price will be relatively higher.
Lead Time: 10–25 working days for standard parts; 20–45 working days for customized components; 45–120 working days for project-based equipment.
Trade Terms: EXW, FOB, CIF, and DAP are generally supported; FCA, CFR, CPT, CIP, and DDP terms can be specifically negotiated.
L-25A Fertilizer Spreader Gearbox Dimensions
Key Features of the L-25A Fertilizer Spreader Gearbox
1. Precision 1:1 Ratio Transmission
The L-25A maintains a true 1:1 fertilizer spreader gearbox ratio, meaning input and output speeds are perfectly matched. This eliminates speed-induced over-application or under-application, giving operators calibrated, repeatable fertiliser distribution across varying field speeds. The result is reduced input costs and improved nutrient efficiency per hectare.
2. Agricultural-Grade Durability
Built with a robust aluminium alloy housing and precision-ground internal gears, this agricultural gearbox withstands constant exposure to harsh chemicals, moisture, fertilizer dust, and field debris. The sealed design prevents contaminant ingress, protecting bearings and gear surfaces from abrasive wear and extending service life beyond typical season requirements.
3. Optimised Torque and Fuel Efficiency
With a maximum output torque of 18.9 Nm and an efficiently designed gear mesh, the L-25A minimises parasitic mechanical losses during power transmission. This optimised torque transfer reduces the load placed on the tractor's PTO and engine, directly lowering fuel consumption during extended spreading operations compared to less efficient agricultural gearbox designs.
4. Broad Application Versatility
This gearbox for fertilizer spreader applications is engineered to handle granular, pelleted, and mineral fertilizer types across diverse terrains. Beyond spreading, it performs reliably in mowers and band saws, making it one of the most versatile agricultural gearboxes in the CMN Transmission lineup. Its standard 1-3/8" 6-spline PTO connection ensures compatibility with a wide range of tractor models globally.
5. Minimal Maintenance Requirements
Oil-bath lubrication with SAE 80W-90 gear oil (max 0.35 L capacity) keeps internal components running cool and protected. The first oil change is required only after 50 to 70 operating hours, with subsequent intervals extending to 500 hours or annually. The modular housing design allows straightforward inspection and component replacement, reducing unplanned downtime during critical planting seasons.
6. Direct Comer L-25A Replacement
Manufactured to match the exact dimensional and performance specifications of the original Comer L-25A, this replacement gearbox requires no modifications to the spreader frame or driveline. OEM-equivalent connection dimensions (25 mm and 1-3/8" 6-spline) ensure bolt-on compatibility. This makes it the preferred choice among fertilizer spreader gearbox suppliers, OEMs, and service technicians managing large fleet replacements.
How Does the L-25A Fertilizer Distributor Gearbox Work
The L-25A fertilizer spreader gearbox receives rotational power directly from the tractor's Power Take-Off (PTO) shaft, typically operating at a standard speed of 540 r/min. The 1-3/8" 6-spline input shaft connection is the universal agricultural standard, ensuring compatibility with virtually all modern tractors used in field crop production worldwide. The PTO coupling transfers raw mechanical energy into the gearbox housing where all subsequent speed and torque conversions take place. At the core of this agricultural gearbox for fertilizer spreader applications is a precision bevel gear set that redirects and transmits torque between the input and output shafts at a true 1:1 ratio. Unlike reducing gearboxes that lower RPM while multiplying torque, the 1:1 configuration maintains the same rotational speed at both shafts, delivering exactly 18.9 Nm of output torque matched to the input rotation of 540 r/min. This is the ideal configuration for spinner disc mechanisms that require direct PTO-equivalent speeds for optimal fertiliser throw patterns and spreading width.
The output shaft (25 mm diameter) delivers rotational power to the spreading mechanism, whether that is a single spinner disc, twin counter-rotating discs, or an auger system. At the correct RPM, the spinning elements generate the centrifugal force required to propel granular fertilizer particles to the desired application width, which can range from a few metres to over 24 metres depending on spreader design and disc configuration. The stable 1:1 output ensures consistent disc speed regardless of tractor throttle variation within the rated operating window. Internal components, including the bevel gears, input/output shaft bearings, and oil seals, are continuously lubricated by a bath of SAE 80W-90 gear oil held within the sealed aluminium housing. The oil circulates as the gears rotate, carrying heat away from contact surfaces and forming a protective film that prevents metal-to-metal wear. The recommended fertilizer spreader gearbox oil level is set by the fill plug at the housing side wall, with the maximum capacity being 0.35 L. Correct oil level maintenance is critical to the longevity of the gearbox.
High-quality radial lip seals on both the input and output shaft exits prevent the ingress of fertilizer dust, moisture, and soil particles while retaining lubrication oil under all operating angles and vibration loads. Agricultural environments are among the most chemically aggressive industrial settings, with ammonium nitrate, potassium chloride, and other fertilizer compounds capable of accelerating corrosion on unprotected surfaces. The sealed housing design ensures these compounds cannot reach internal gear and bearing surfaces, dramatically extending service life.
The aluminium alloy housing acts as a passive heat sink, conducting frictional heat generated by gear meshing and bearing rotation away from the internal surfaces and dissipating it into the surrounding air. Aluminium's superior thermal conductivity compared to cast iron means the L-25A runs cooler during extended spreading operations, reducing thermal stress on oil viscosity and gear tooth geometry. This thermal advantage helps maintain consistent performance even during long continuous runs on large farm operations. While the L-25A gearbox does not include an integrated slip clutch, it is designed to operate within the PTO driveline's standard overload protection systems provided by the tractor or the spreader's driveshaft assembly. The rated maximum input power of 11 kW defines the safe operating envelope. Exceeding this rating due to blockages or mechanical shock loads should be managed through the driveline's shear bolt or torque-limiting coupling, protecting the fertilizer gearbox from internal damage.
Application Scenarios
Arable Crop Farming
Essential for uniform application of NPK granules, urea, and other fertilizers across grains, oilseeds, and row crops. The 1:1 fertilizer spreader gearbox ratio ensures that the disc rotation matches PTO output precisely, delivering consistent spreading widths of up to 24 metres for maximum field coverage efficiency and optimal crop nutrient uptake.
Pasture and Livestock Farming
In livestock operations, pasture maintenance depends on timely and even fertilizer application to maintain forage quality and sward density. This fertiliser spreader gearbox powers spreaders that distribute nitrogen, phosphorus, and potassium blends across grazed pastures without leaving over-application strips that could damage sensitive grass species or create bare patches.
Turf, Sports Fields and Golf Courses
High-value turf environments demand precise, customisable fertilizer application without scalding or uneven distribution. The stable 1:1 output of this gearbox for fertilizer spreader applications allows groundskeeping teams to dial in exact application rates for premium sports fields, race courses, and golf fairways, protecting costly turf investments while promoting uniform grass growth and colour.
Horticulture and Nurseries
Controlled-environment and open-field horticultural operations use this agricultural gearbox to power precision spreaders for granular fertilizer delivery around potted crops, ornamental plants, and greenhouse borders. The low weight of just 4.1 kg makes it practical for smaller, manoeuvrable spreader units used in nursery alleys and polytunnel lanes.
Orchards and Vineyards
In orchard and vineyard settings, fertilizer must be applied precisely around delicate root zones without over-spraying onto fruit or vine canopy. The reliable torque transmission of this fertilizer spreader gearbox ensures that spreader discs operate at consistent speed even during slow inter-row tractor passes, protecting root health and soil microbiology in high-value perennial crop systems.
Soil Amendment Distribution
Beyond standard fertilizers, this gearbox drives spreaders distributing lime, dolomite, compost granules, biochar, and other soil conditioners that improve pH, structure, and fertility. These amendments are often applied in large volumes at coarser particle sizes, and the robust 11 kW input rating handles the increased mechanical demands without overheating or premature wear of the fertilizer spreader gearbox parts.
L-25A Fertilizer Spreader Gearbox Components
Aluminium Gearbox Housing
The precision die-cast aluminium alloy housing forms the structural backbone of the entire gearbox assembly. It encloses and protects all internal moving components from environmental contaminants, while its high thermal conductivity promotes efficient heat dissipation during extended operation. The housing is machined to tight tolerances to ensure accurate shaft alignment and consistent gear mesh geometry throughout the product's service life.
PTO Input Shaft
The hardened steel input shaft is machined with a standard 1-3/8" 6-spline profile, designed to accept the universal PTO coupling used on virtually all agricultural tractors. It is supported by precision roller bearings at both ends to handle the combined radial and axial loads generated during spreader operation. The shaft interfaces directly with the bevel gear to begin the power transmission sequence within the gearbox.
Bevel Gear Set
At the heart of this fertilizer distributor gearbox is a matched pair of case-hardened bevel gears that redirect power flow between perpendicular shafts at the specified 1:1 ratio. The gear teeth are precision-ground to minimise backlash and noise, and surface-hardened to resist the contact stress generated during continuous agricultural operation. Correct gear mesh is pre-set at the factory, requiring no field adjustment throughout the gearbox service life.
Output Shaft
The 25 mm diameter output shaft transmits the converted torque of 18.9 Nm to the spreader's disc or auger drive system. Made from high-tensile alloy steel and precision-turned, it is supported by dual roller bearings within the housing to handle the significant overhung loads generated by heavy spinner discs during field operation. The shaft exits through a precision-machined bore sealed with a lip seal to prevent oil leakage and contamination ingress.
Roller Bearings
Four precision-grade roller bearings support the input and output shafts, handling both radial (weight and disc load) and axial (thrust from bevel gear operation) forces simultaneously. Sourced to agricultural machinery quality standards, these bearings are rated for the 500-hour oil change cycle and are accessible for replacement when sourcing fertilizer spreader gearbox parts during scheduled maintenance overhauls.
Radial Lip Oil Seals
High-performance rubber lip seals are fitted at every shaft exit point on the housing to provide a dynamic seal against rotating surfaces. These seals prevent the internally contained SAE 80W-90 lubricating oil from escaping while simultaneously blocking the ingress of fertilizer dust, water spray, and soil particles. Seal material selection is optimised for compatibility with agricultural-grade gear oils and fertilizer chemical environments.
Oil-Bath Lubrication System
The lubrication system consists of the oil fill plug, a drain plug, and an oil level check point integrated into the housing walls. The gearbox operates with 0.35 L of SAE 80W-90 gear oil forming a continuous bath that reaches the gear and bearing contact zones as the unit rotates. The monitoring and management of the fertilizer spreader gearbox oil level is the single most important routine maintenance action for ensuring component longevity.
Installation Steps
1. Safety Preparation and PTO Disconnection
Before beginning any installation work, disengage the tractor PTO, switch off the engine, remove the ignition key, and allow all rotating components to come to a complete standstill. Engage the tractor's handbrake and place wheel chocks under the tyres. Personal protective equipment including gloves and safety glasses should be worn throughout. Failure to observe these precautions when working on fertilizer spreader gearbox parts presents a serious crush injury risk.
2. Remove the Old Gearbox
Disconnect the PTO driveshaft from the existing gearbox input by sliding the yoke off the splined shaft after removing the retaining clip. Disconnect the output shaft coupling from the spreader disc drive using appropriate spanners. Support the old gearbox weight before unbolting the four mounting flange bolts. Lift the old unit clear of the spreader frame and clean the mounting face and shaft connection points to remove any rust, debris, or old sealant residue.
3. Position and Bolt the New L-25A Gearbox
Lift the CMN L-25A replacement gearbox into position on the spreader mounting frame, aligning the four N.4 x 11 mm bolt holes with the frame's corresponding threaded apertures. The mounting bolt pattern (113.5 x 148 mm) matches the Comer L-25A original exactly, so no frame modification should be required. Insert Grade 8.8 mounting bolts and tighten progressively in a diagonal sequence to the torque value specified in the spreader machine manufacturer's manual, ensuring even clamping force across the flange face.
4. Connect PTO Driveshaft and Output Coupling
Slide the PTO driveshaft yoke onto the 1-3/8" 6-spline input shaft until fully engaged, then lock with the retaining circlip ensuring it seats correctly in its groove. Connect the output shaft coupling (25 mm) to the spreader disc drive assembly and secure with the appropriate fasteners. Check that the driveshaft is free from kinks and operates at an angle within the driveshaft manufacturer's rated operating angle limits across the full range of tractor articulation.
5. Fill with Gear Oil to Correct Level
Remove the oil fill plug located on the upper housing face. Using a syringe or small funnel, fill the gearbox with SAE 80W-90 gear oil to the level of the check/fill aperture (maximum 0.35 L). The gearbox is supplied without oil, so this step is mandatory before operation. Do not overfill, as excess oil causes pressure build-up that can force seals out or cause oil leakage past the shaft seals. Replace the fill plug securely and wipe away any spillage from the housing exterior.
6. Commission and First Operation Check
With all personnel clear of rotating parts, start the tractor engine and engage the PTO at low throttle (approximately 300-350 RPM) for the first two to three minutes to allow oil to circulate and coat all internal surfaces. Gradually increase to operating speed (540 r/min) and listen for any abnormal noise indicating misalignment or assembly issues. Check all connection points for oil leakage. After the first 50 to 70 operating hours, drain and replace the initial run-in oil to remove any fine metal particles from bedding-in, then refill with fresh SAE 80W-90.
How to Choose the Right Agricultural Gearbox for Fertilizer Spreader
Match Load Capacity to Your Spreader
Calculate the combined weight of your spreader hopper at full load and the inertial load of the spinning discs. For compact trailed or mounted spreaders with a single disc, the L-25A rated at 11 kW input is typically more than adequate. For twin-disc or high-volume spreaders, consult CMN Transmission's engineering team to confirm the appropriate model. Always select a gearbox with at least 20% rated power headroom above your calculated requirement to ensure longevity and prevent thermal overload of the agricultural gearbox for fertilizer spreader duty.
Select the Correct Gearbox Ratio
The fertilizer spreader gearbox ratio directly determines disc rotational speed and therefore spreading width and distribution pattern. A 1:1 ratio (as in the L-25A) passes full PTO speed to the disc, which is ideal for standard spinner spreader designs calibrated for 540 RPM disc operation. If your spreader system calls for a slower disc speed (e.g., for liquid-fertilizer or precision-placement applications), selecting a ratio of 2:1 or 3:1 would be appropriate. Always cross-reference the disc manufacturer's recommended RPM range before selecting a ratio.
Prioritise Material Durability for Your Environment
In regions with high humidity, coastal salt air, or intensive fertilizer chemical exposure, selecting a gearbox with an aluminium housing (like the L-25A) provides superior corrosion resistance compared to cast iron alternatives. The aluminium's natural oxide layer and ability to accept additional protective coatings makes it particularly suited to fertilizer environments. For very high-load or high-shock applications such as manure spreading, heavier-duty cast iron options from the CMN range should be considered instead.
Verify Dimensional Compatibility
Before ordering, confirm that the replacement gearbox's shaft dimensions, spline profiles, and mounting bolt pattern match your existing spreader frame and driveshaft. The L-25A is a direct dimensional replacement for the Comer L-25A, with identical 1-3/8" 6-spline input, 25 mm output, and N.4 x 11 mm bolt hole pattern. For other spreader brands and models, download the CMN Transmission dimensional drawing or contact our technical sales team with your existing unit's measurements to confirm cross-reference compatibility before purchase.
Consider Long-Term Maintenance Access
A key selection criterion for large fleet operators and agricultural contractors is the long-term availability of spare parts and the ease of service. CMN Transmission's global network of distributors in 60+ countries ensures that fertilizer spreader gearbox parts, including bearings, seals, and oil, are readily accessible in most agricultural markets. Choose a gearbox brand with documented service schedules, clear oil type specifications, and established distributor support in your country to minimise total cost of ownership over the product's working life.
Evaluate Certifications and Quality Standards
For OEM procurement, export compliance, and end-user assurance, gearbox certifications matter significantly. CMN Transmission holds CE marking, ISO 9001 quality management, Environmental Management, and Occupational Health and Safety certifications. These validate that the L-25A fertilizer spreader gearbox is designed, manufactured, and tested to internationally recognised standards. When evaluating multiple fertilizer spreader suppliers, prioritise vendors who can provide third-party certification documentation rather than relying solely on marketing claims regarding quality.
Fertilizer Spreader Gearbox vs Flail Mower Gearbox
Fertilizer Spreader Gearbox
A fertilizer spreader gearbox, such as the CMN L-25A, is engineered to transfer PTO power to spinner discs or agitators that project granular or powdered fertilizer, seed, or granules across the field. The operating load is relatively light and consistent because spinning discs require low torque at constant speed. The primary engineering priorities are corrosion resistance (due to constant exposure to fertilizer chemicals), precise ratio maintenance (to ensure spreading width consistency), and low weight to suit compact, lightweight spreader frames. Housings are typically aluminium to minimise weight and resist agrochemical corrosion. Oil capacity is small (0.35 L in the L-25A) due to the compact size. The gearbox for fertilizer spreader applications does not need to absorb sudden shock loads and is not typically equipped with integrated slip clutches, relying instead on the driveshaft's overload protection. Common ratio options range from 1:1 to 3:1 depending on disc speed requirements.
Flail Mower Gearbox
A flail mower gearbox transmits PTO power to a high-inertia drum or rotor carrying dozens of individual steel flails (hammers or blades) that chop and mulch grass, crop residues, hedgerow material, and light scrub. The operating environment demands a gearbox that can handle significant peak shock loads when flails strike hard objects such as stones, stumps, or dense crop stems. Flail mower gearboxes are therefore built with heavier-section housings (often cast iron or thick-wall cast aluminium), larger gear modules for shock resistance, higher oil capacities, and are frequently paired with integrated slip clutches or shear bolt protection to absorb sudden overloads. They typically operate at speed-reducing ratios (commonly 1.4:1 to 3:1) because the large diameter rotor needs lower RPM than the PTO shaft provides. The gearbox must also manage sustained high-torque loading during heavy cutting passes, requiring larger bearing sections and more robust shaft diameters than comparable fertilizer spreader gearboxes.
| Feature | Fertilizer Spreader Gearbox | Flail Mower Gearbox |
|---|---|---|
| Primary Function | Drive spinner discs / augers for fertilizer distribution | Drive rotor with flails for chopping / mulching |
| Typical Load Profile | Light, consistent, low-torque | Heavy, variable, high shock torque |
| Common Ratios | 1:1 to 3:1 (speed maintaining or slight reduction) | 1.4:1 to 3:1 (speed reducing, torque multiplying) |
| Housing Material | Aluminium (light, corrosion-resistant) | Cast iron or heavy aluminium (shock-resistant) |
| Typical Weight | 2 to 8 kg | 8 to 35 kg |
| Overload Protection | External (driveshaft slip clutch) | Often integrated slip clutch or shear bolt |
| Corrosion Resistance Priority | High (fertilizer chemical exposure) | Moderate (soil and debris exposure) |
| Oil Capacity | Small (0.35 L for L-25A) | Larger (0.8 L to 3+ L) |
| Gear Type | Bevel gears (right-angle drive) | Bevel and/or spur gears (right-angle or in-line) |
| Typical PTO Speed | 540 r/min | 540 or 1000 r/min |
Why Choose CMN Transmission's Fertilizer Spreader Gearboxes?
Korea CMN Transmission Co., Ltd. was established in 2000 and is headquartered in Sandan-o, Danwon-gu, Ansan-si, Gyeonggi-do, Korea. With over 100 dedicated factory employees and more than two decades of focused manufacturing experience, CMN Transmission has grown from a regional supplier into a globally recognised name among fertilizer spreader gearbox manufacturers. Our operations encompass the complete product lifecycle: in-house R&D, CNC precision manufacturing, quality assurance testing, and global after-sales support. An annual production capacity exceeding 500,000 gearbox units underpins our ability to fulfil both small distributor orders and high-volume OEM supply agreements without compromising on lead times or consistency.
Our product range is among the most comprehensive available from any single agricultural gearbox manufacturer: rotary cutter gearboxes, rotary tiller gearboxes, feed mixer gearboxes, rotary mower gearboxes, fertilizer spreader gearboxes, flail mower gearboxes, post hole digger gearboxes, round baler gearboxes, square baler gearboxes, disc mower gearboxes, centre pivot irrigation gearboxes, hydraulic drive gearboxes, silage machine gearboxes, orchard sprayer gearboxes, rotary rake gearboxes, combine harvester gearboxes, grain storage gearboxes, grain transportation gearboxes, corn header gearboxes, cutting bar gearboxes, poultry feeding gearboxes, and custom agricultural gearboxes covering nearly 1,000 specifications.
CMN Transmission holds CE, ISO 9001, Environmental Management, and Occupational Health and Safety certifications. Our products are exported 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 beyond.
Whether you are an agricultural machinery OEM integrating gearboxes into new spreader designs, a distributor stocking replacement parts for the aftermarket, or a farm operator seeking a direct Comer replacement, CMN Transmission offers the product quality, technical support, and supply chain reliability to meet your requirements. Contact our team today for a quotation, technical consultation, or to discuss custom agricultural gearbox specifications.
Frequently Asked Questions
Q: Is the CMN L-25A a direct replacement for the Comer L-25A fertilizer spreader gearbox?
A: Yes. The CMN Transmission L-25A is manufactured as a direct dimensional and functional replacement for the original Comer L-25A gearbox. The input shaft (1-3/8" 6-spline), output shaft diameter (25 mm), mounting bolt pattern, and housing external profile all match the Comer original. No spreader frame modification or driveshaft adaptation is required for a like-for-like swap.
Q: What type of oil should I use in the L-25A fertilizer spreader gearbox, and what is the correct oil level?
A: The L-25A requires SAE 80W-90 mineral gear oil. The correct fertilizer spreader gearbox oil level is set by filling through the fill plug aperture until oil reaches the check port, with a maximum capacity of 0.35 L. The unit is supplied without oil, so filling is mandatory before first use. Overfilling can damage seals, while underfilling causes premature gear and bearing wear. Check and top up the oil level at the start of each spreading season.
Q: How often should the gear oil be changed in a fertilizer gearbox?
A: Perform the first oil change after 50 to 70 operating hours to flush fine metal particles generated during the initial run-in period. Subsequent oil changes are recommended every 500 operating hours or at a minimum once per year, whichever comes first. In high-dust or high-moisture environments, or where the fertilizer spreader gearbox is used with particularly aggressive agrochemicals, more frequent changes of every 300 to 400 hours are advisable.
Q: What is the fertilizer spreader gearbox ratio of the L-25A and why does it matter?
A: The L-25A features a 1:1 fertilizer spreader gearbox ratio, meaning the output shaft rotates at exactly the same speed as the input shaft. At a standard tractor PTO speed of 540 r/min, the spreader disc also rotates at 540 r/min. This direct speed relationship is important because disc RPM directly determines the fertilizer throw distance and spreading width. Changing to a different ratio (e.g., 2:1 or 3:1) would require recalibration of all spreading width and application rate settings.
Q: Can the L-25A fertilizer spreader gearbox be used with both 540 RPM and 1000 RPM PTO tractors?
A: The L-25A is rated for a maximum input rotation speed of 540 r/min and is designed for use with standard 540 RPM PTO outputs only. Operating the gearbox at 1000 RPM PTO speed would significantly exceed the rated maximum and could result in premature bearing wear, gear fatigue failure, and overheating. If you require a gearbox for a 1000 RPM PTO system, please contact CMN Transmission for the appropriate model specification from our agricultural gearbox range.
Q: What is the maximum input power rating of the L-25A agricultural gearbox?
A: The L-25A is rated for a maximum input power of 11 kW (approximately 15 HP). This is the upper continuous operating limit, and the gearbox should not be run at higher power inputs. For applications where the spreader regularly requires more than 11 kW due to heavy disc loads, large hopper sizes, or twin-disc configurations, CMN Transmission's larger-frame agricultural gearbox models with higher power ratings should be considered. Contact us with your specific power and load requirements for a tailored recommendation.
Q: Does the L-25A gearbox come with oil included, and how do I know when to replace it?
A: No, all CMN Transmission gearboxes are supplied without oil. You must add 0.35 L of SAE 80W-90 gear oil before the first use. To check when oil needs replacement, drain a small sample from the drain plug after the unit has been running. Fresh 80W-90 gear oil is amber-coloured and translucent. Oil that is dark brown to black, milky (indicating water contamination), or contains visible metal particles should be changed immediately regardless of the operating hours elapsed.
Q: Can I use this gearbox on a twin-disc fertilizer spreader?
A: The L-25A has a single output shaft (25 mm diameter) and is suited to single-disc spreader configurations or as one gearbox in a twin-disc system where each disc has its own dedicated gearbox. If your spreader is designed to use one central gearbox driving both discs through a secondary chain or belt system, confirm that the total power demand of both discs combined does not exceed the 11 kW rated maximum of the L-25A. Contact CMN Transmission if you require advice on your specific twin-disc spreader configuration.
Q: Where can I find CMN Transmission's fertilizer spreader gearbox for sale, and do you offer bulk pricing?
A: The L-25A is available directly through our online store and through CMN Transmission authorised distributors in over 60 countries. For OEM buyers, agricultural machinery importers, and dealers requiring quantities of 10 units or more, we offer tiered volume pricing and consolidated shipping from our Korea manufacturing facility. Enquire via the contact form or email our export sales team with your annual volume estimate for a customised quotation.
Q: What certifications does CMN Transmission hold for its agricultural gearboxes?
A: CMN Transmission Co., Ltd. holds CE marking certification (confirming compliance with EU machinery directives), ISO 9001 Quality Management System certification, Environmental Management certification, and Occupational Health and Safety certification. These certifications cover the complete product range including fertilizer spreader gearboxes, rotary tiller gearboxes, and all other agricultural gearbox types. Certification documents are available upon request for OEM qualification and import compliance purposes in regulated markets including the EU, UK, and Australia.
Customer Reviews
James, Crop Farming, Australia
"We've been running the L-25A on our twin-disc centrifugal spreader for about eight months now, and it's holding up really well. Replaced an old Comer unit that had started leaking, and the CMN one bolted straight in, no drama. We spread around 600 acres of canola last autumn and had zero issues. The oil level check is easy to do, which I appreciate because maintenance often gets skipped when you're under pressure during the season."
Michal, Pasture Management, Germany
"We ordered 25 units of the L-25A gearbox for our spreader assembly line and the quality was consistent across the whole batch. Every housing passed our incoming inspection for dimensional accuracy and the spline profiles were spot on. Lead time from Korea to our facility in Poznan was about three weeks by sea, which is acceptable for planned production. The price per unit makes the landed cost very competitive versus sourcing European-brand replacements."
Carlos, Agricultural Machinery, Brazil
"I run a small agricultural machinery repair workshop in Sao Paulo state and the CMN L-25A has become my go-to Comer replacement. Local farmers bring in spreaders with worn-out gearboxes every season, and the CMN unit fits without any modification. I've installed maybe 30 of them over the past two years and not a single one has come back for a warranty issue. The pricing is fair and my CMN distributor here keeps stock, so I'm never waiting weeks for parts."
Pierre, Crop Farming, France
"I ordered two L-25A gearboxes to replace the old ones on our fertilizer spreaders. Delivery from Korea took about four weeks, which is reasonable. The packaging was solid, with no damage in transit. Assembly was simple, the dimensions matched exactly. After a full working season on our arable land in Burgundy, both gearboxes are functioning perfectly, with no oil leaks and no abnormal noise. I recommend it without hesitation."
Mark, Agricultural Parts Distributor, United States
"We distribute agricultural spare parts across the Midwest and added the CMN L-25A to our catalog last spring. It's been one of our best-selling replacement gearboxes. Farmers who've tried it say it runs quietly and doesn't leak, which are the two things they complained most about with cheaper aftermarket alternatives. The aluminium housing looks solid and the weight is good for a 4.1 kg unit. Customer return rate on this product so far is basically zero, and that's what matters most for us as distributors."
Alejandro, Crop Farming, Argentina
"We manage about 1,200 ha of wheat and corn in the Pampas region and use several centrifugal spreaders for our fertilizer program. We replaced three worn gearboxes with the CMN L-25A mid-season and honestly couldn't believe how easy it was. Arrived in Buenos Aires in good condition, the spline was identical to our existing driveshafts, and we had them all running within an hour. After doing the first oil change at 60 hours as instructed, everything is clean inside - no metal particles, no wear at all. Very impressed."
David, Lawn and Turf Management, United Kingdom
"Purchased the L-25A through CMN's UK distributor for our estate's fertilizer spreader and the service was excellent from start to finish. The technical team confirmed the compatibility with our machine before I ordered, which I found very helpful. Delivery was two days from the UK warehouse. Fitting took about 45 minutes including filling with 80W-90 oil. It's been running for one full spreading season without a single problem. The build quality feels noticeably better than the generic unit we tried before this one."
Rajiv, Soil Amendments, India
"Our cooperative sources agricultural machinery parts for several hundred member farms across Punjab and Haryana. We trialled the CMN L-25A on ten spreaders before committing to a larger order. The results were very positive. Farmers reported quieter running and no oil leakage after a full Rabi and Kharif season spreading DAP and urea. The aluminium housing handles the heat well during our summer operations. We have since placed a bulk order for 200 units, which arrived in Mumbai on schedule. CMN's export documentation was also clean and complete."
Marco, Crop Farming, Italy
"We replaced six old transmissions on as many fertilizer spreaders with CMN's L-25A and the result was excellent. The measurements perfectly matched our original Comer mountings, so assembly was fast. After the whole spring spreading season on corn and wheat in Emilia-Romagna, we did not encounter any problems. The build quality and price convinced us to include CMN as a main supplier for this type of component. The pre-sales support service was very professional."
Additional information
| Edited by | Yjx |
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