L-25J Fertilizer Spreader Gearbox Ratio 1:1.9 Replacement for Comer L-25J Gearbox

The L-25J Fertilizer Spreader Gearbox Ratio 1:1.9 Replacement for Comer L-25J Gearbox, also called a fertilizer distributor gearbox, is an essential component of agricultural machinery, specifically designed for tasks such as soil preparation, crop treatment, and fertilizer spreading. Located at the center of the machine, it transmits power from the tractor's power take-off (PTO) to the spinning discs or augers that evenly distribute fertilizer across the fields. Engineered for durability and reliability, this fertilizer spreader gearbox ensures consistent power transmission to meet varying operational demands across diverse farm environments.

Equipped with precision-cut gears and hardened shafts, this agricultural gearbox adjusts rotational speed and torque based on the spreading requirements, optimizing machine performance throughout the season. With a gear ratio of 1:1.9, an aluminium housing that keeps unit weight down to just 4.1 kg, and compatibility with standard 1.3/8-6 spline PTO shafts running at 540 r/min, this gearbox is built to withstand the rigorous conditions of agricultural work. Whether applied in grain farming, vegetable cultivation, pasture management, or horticulture, this fertiliser spreader gearbox plays a crucial role in enhancing the efficiency and effectiveness of fertilizer application programs while reducing operator input and maximizing yield outcomes.

Technical Parameters

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-25J Fertilizer Spreader Gearbox Dimensions

Key Features of the L-25J Fertilizer Spreader Gearbox 1:1.9

1. PTO Interface & Spline Compatibility
The input shaft is machined to match the standard 1.3/8-6 tractor PTO spline profile, ensuring a direct, vibration-free fit with most common tractor drivelines running at 540 r/min. Correct PTO matching eliminates misalignment, reduces mechanical wear, and prevents premature bearing failure. Our gearboxes are supplied ready to couple without any adapter modification, significantly reducing installation time and complexity for operators in the field.

2. Optimized Gear Ratio & Output Options
The 1:1.9 gear ratio is carefully selected to deliver the ideal disc RPM range for centrifugal fertilizer spreading. This speed-up configuration takes 540 r/min PTO input and boosts output speed to achieve precise, wide-coverage spreading arcs. The 22 mm diameter output shaft supports standard disc and agitator mounts across a broad range of OEM fertilizer spreader machines. Contact CMN Transmission for custom ratio configurations where different spreading widths or granule types require tailored output speeds.

3. Corrosion-Resistant Construction
Fertilizer environments are chemically aggressive: nitrogen, potash, and phosphate compounds attack unprotected metal surfaces rapidly. This gearbox features an aluminium alloy housing that resists corrosion naturally, combined with high-quality lip seals and sealed bearings that block moisture ingress and fertilizer dust contamination. Internal gear surfaces and shafts are treated to resist chemical attack during extended spreading seasons. This makes the L-25J particularly well suited to operators handling corrosive compound fertilizers in wet or tropical climates.

4. Agitator & Disc Drive Integration
The L-25J is designed to integrate smoothly with both spinning disc systems and agitator-driven spreader configurations. In single-disc designs, the output shaft connects directly to the disc hub. In twin-disc or agitator-inclusive models, the gearbox provides a consistent torque supply that prevents material bridging in the hopper while simultaneously powering the main spread disc. This dual functional design makes the gearbox a versatile core component across multiple spreader platform types from compact trail spreaders to wide-boom trailed machines.

5. Serviceability in Field Conditions
The L-25J gearbox is designed with operator serviceability in mind. Oil fill, drain, and level check points are conveniently positioned and accessible without removing the gearbox from the machine. The maximum oil capacity of 0.35 L and the recommended 80W-90 SAE grade gear oil are industry-standard, available at any agricultural supply outlet globally. The first oil change interval at 50-70 operating hours allows early detection of any break-in wear particles, while the 500-hour or annual standard interval makes scheduled maintenance simple and predictable for farm managers.

6. Wide Range of Agricultural Applications
Beyond fertilizer spreading, the L-25J gearbox is rated for mowers, multi-row rotary tillers, and band saw applications, making it one of the most versatile compact gearboxes in the agricultural machinery segment. Its 11 kW / 15 HP power handling and 1000 N·m maximum output torque cover the full working range of light to medium-duty implements. Whether you operate mixed grain and forage systems or dedicated horticulture enterprises, this agricultural gearbox for fertilizer spreader delivers reliable performance season after season without the premium cost of OEM replacement parts.

How Does the L-25J Fertilizer Spreader Gearbox Work

The L-25J fertilizer spreader gearbox receives rotational power from the tractor's PTO shaft at a standard input speed of 540 r/min. Through a precisely engineered 1:1.9 gear arrangement, it converts this input into a higher output speed suited to driving centrifugal spreading discs. The gear pair within the aluminium housing are helical or bevel-cut to minimize noise and vibration during operation, while the gear reduction arrangement (type 1-2) ensures the output shaft delivers the correct torque multiplied force required to overcome the inertia of a loaded hopper disc even under full-load spreading conditions. This smooth, consistent power flow is what distinguishes a quality fertilizer distributor gearbox from lower-grade alternatives that exhibit speed fluctuation and uneven spread patterns.

The aluminium alloy housing of the L-25J naturally dissipates heat generated during sustained PTO operation, maintaining internal lubricant film integrity even during extended fertilizer application runs in warm climates. The housing is engineered with machined bearing seats that maintain dimensional accuracy over the life of the gearbox, preventing the wobble and side-load on output shafts that is common in cheaper cast-steel alternatives. High-quality lip seals at both the input and output shaft exits provide a reliable barrier against fertilizer dust, mud, and moisture intrusion. The gearbox is pre-fitted with all internal components and shipped dry, allowing the operator to fill with the locally available 80W-90 gear oil before first use. Internal oil capacity of 0.35 L is sufficient to maintain full lubrication of all gear and bearing contact surfaces throughout the 500-hour service interval.

The relationship between gearbox torque output and fertilizer spread pattern quality is direct: inconsistent torque output leads to disc speed variation, which in turn produces uneven spread width and application rate. The L-25J is rated to a maximum output torque of 1000 N·m, providing a substantial torque reserve above normal working loads. This reserve capacity means the disc speed remains stable even when hopper blockages, material clumping, or sudden load surges occur. The stable disc speed translates into consistent spreading widths and accurate application rates, which are critical for achieving uniform nutrient distribution across large field areas and preventing both over- and under-application zones that waste expensive fertilizer inputs.

While the L-25J gearbox itself is a mechanically robust power transmission unit, it is designed to be used in combination with a compatible PTO shaft fitted with a slip clutch or shear bolt overload protection system. In the event of a foreign object or material jam at the spread disc or agitator, the overload protection upstream of the gearbox interrupts the torque transmission before damaging loads reach the gearbox internal components. This system-level approach to overload protection ensures the gearbox investment is protected throughout its operational life, minimizing the risk of catastrophic gear failure that would otherwise require a complete gearbox replacement rather than a simple shear bolt change.

Application Fields

L-25J Fertilizer Spreader Gearbox Parts

Gearbox Housing
The aluminium alloy housing forms the structural foundation of the L-25J. Precision die-cast and machined to tight dimensional tolerances, it maintains accurate bearing seat geometry and gear mesh alignment throughout the product's service life. The aluminium material provides excellent thermal conductivity to dissipate heat during sustained operation, while its natural corrosion resistance makes it ideal for the aggressive chemical environment of fertilizer application.

Input Shaft
The hardened and ground input shaft features a 1.3/8-6 spline profile that connects directly to the tractor PTO driveshaft. The shaft is manufactured from high-grade alloy steel, case-hardened to ensure the spline teeth resist wear even after repeated coupling and uncoupling cycles. Proper input shaft condition is critical for maintaining a vibration-free connection between the PTO driveline and the gearbox internal gear pair.

Bevel Gears
The bevel gear pair is the heart of the L-25J's power transmission. Precision-machined from case-hardened alloy steel and lapped to achieve optimized tooth contact patterns, these gears convert the direction of power flow while stepping up the rotational speed at the 1:1.9 ratio. Correct gear mesh and lubrication of the bevel set directly determines spread uniformity, noise level, and the overall operational life of the gearbox assembly.

Output Shaft
The output shaft, with its 22 mm outside diameter, is the connection point between the gearbox and the spreading disc or agitator. Machined from high-tensile steel with a ground bearing journal and keyway, it transmits the boosted speed and torque from the gear pair directly to the spreading mechanism. The shaft is supported by precision bearings at both inboard and outboard positions to handle the combined radial and axial loads from the spinning disc assembly.

Bearings
Deep groove ball bearings or tapered roller bearings are used at each shaft support position within the L-25J. These are selected for their ability to carry the combined radial loads from gear mesh forces and the axial loads from disc weight and centrifugal spreading forces. Pre-greased sealed bearings at the output shaft exit prevent fertilizer ingress, while the input shaft bearing is lubricated by the 80W-90 gear oil bath that circulates within the gearbox housing.

Oil Seals
High-quality NBR rubber lip seals are fitted at each shaft exit point to prevent oil leakage from the housing and block ingress of fertilizer dust, moisture, and field contamination. In the aggressive chemical environment of fertilizer spreading, seal quality is paramount: inferior seals deteriorate rapidly when exposed to nitrogen and phosphate compounds, leading to oil loss, bearing starvation, and accelerated internal wear. Replacement seals are a standard fertilizer spreader gearbox part that should be inspected at each service interval.

Lubrication System
The L-25J uses a splash lubrication system where the lower gear immerses in the 0.35 L oil sump and throws lubricant across gear teeth and bearing contact surfaces during rotation. The specified 80W-90 SAE gear oil provides an adequate viscosity film at normal operating temperatures, protecting all internal surfaces from metal-to-metal contact. The oil fill and drain plugs are accessible from outside the housing for convenient oil changes at the recommended 500-hour intervals without removing the gearbox from the spreader frame.

Housing Gaskets & Fasteners
The split-line gasket between housing halves is manufactured from oil-resistant material to maintain an oil-tight seal even under the thermal cycling conditions experienced during seasonal agricultural use. Stainless-grade or zinc-plated housing fasteners resist the surface corrosion caused by fertilizer splash, ensuring secure reassembly after service and preventing the galvanic corrosion between fastener and aluminium housing that can seize bolts after extended outdoor storage.

Common Troubleshooting

Fertilizer Spreader Gearbox vs Flail Mower Gearbox

What Is a Fertilizer Spreader Gearbox?

A fertilizer spreader gearbox, also called a fertilizer distributor gearbox, is an essential component of agricultural machinery specifically designed for tasks such as soil preparation, crop treatment, and fertilizer spreading. Located at the center of the machine, it transmits power from the tractor's PTO to the spinning discs or augers that evenly distribute fertilizer across the fields. These gearboxes are engineered for durability and reliability, ensuring consistent power transmission to meet varying operational demands. They are equipped with a series of gears and shafts that adjust the rotational speed and torque based on spreading requirements, optimizing machine performance.

Advantages of Fertilizer Spreader Gearboxes

• Precision application: Delivers consistent disc speed that translates to repeatable spreading widths and application rates across varying field conditions and material types.
• Corrosion resistance: Aluminium housing and sealed internal components resist chemical attack from nitrogen, potash, and phosphate fertilizers over multiple seasons.
• Lightweight design: At 4.1 kg, the L-25J adds minimal weight to the spreader frame, reducing the implement's total mass and improving tractor fuel efficiency during field operations.
• Speed-up capability: The 1:1.9 ratio converts standard 540 r/min PTO speed into the higher disc RPM needed for centrifugal spreading without requiring a separate step-up gearbox in the driveline.
• Multi-application compatibility: Functions across mowers, rotary tillers, and band saw applications in addition to fertilizer spreading, offering value across multiple machine types on a mixed farm.

Applications of Fertilizer Spreader Gearboxes

• Centrifugal twin-disc and single-disc fertilizer spreaders for arable and horticultural crops
• Lime and soil amendment spreaders for pH correction programs
• Pendulum spreaders used in vegetable and fruit farm precision application
• Sports turf and golf course fertilizer application equipment
• Pasture topdressing systems in dairy and sheep farming operations

What Is a Flail Mower Gearbox?

A flail mower gearbox is the essential power transmission component in a flail mower, designed to efficiently convert the tractor's PTO power into the necessary torque for effective vegetation cutting. Constructed from high-quality materials such as cast iron or aluminium alloy, these gearboxes are built to withstand heavy-duty mowing operations involving high rotor inertia and impact loads from stones and debris. The gearbox houses interlocking spur, worm, or bevel gears encased in a robust housing that protects internal components from dirt and plant debris. Regular lubrication ensures smooth operation and extends the gearbox's lifespan under demanding cutting conditions.

Advantages of Flail Mower Gearboxes

• High torque capacity: Designed to handle the shock loads generated when flail blades strike rocks, stumps, and dense vegetation without catastrophic gear failure.
• Speed reduction: Steps down from PTO input speed to a lower, higher-torque rotor RPM suited to heavy vegetation cutting without overspeeding the flail blade tips.
• Robust housing: Cast iron or heavy-gauge aluminium housings withstand the vibration and impact transmitted back through the driveline from rotor strikes in rough terrain.
• Overload protection compatibility: Designed to work with slip clutch or shear bolt protection systems that prevent gearbox damage when rotor blockages occur in heavy grass or crop residue.

Applications of Flail Mower Gearboxes

• Roadside and verge mowing operations in highway maintenance
• Orchard floor vegetation management and undergrowth control
• Crop residue chopping and mulching after harvest
• Land clearing and scrub reduction on difficult terrain
• Vineyard row management and grass suppression between vine rows

Comparison Table:

Fertilizer Spreader Gearbox and PTO Drive Shaft

Fertilizer spreader gearboxes transfer power from the tractor's PTO to the spinner discs or agitators that distribute fertilizer, seed, or granular amendments. The gearbox reduces or steps up PTO rotational speed, adjusts torque, and ensures consistent spreading performance across varying ground speeds and material types. The L-25J's durable, corrosion-resistant aluminium design withstands harsh fertilizer environments for multiple seasons without housing degradation. It converts the 540 r/min PTO input to the optimized disc speed required for the target spreading width, ensuring nutrient placement is uniform and accurate across every pass of the field.

The internal gear set, sealed bearings, and oil lubrication system work together to maintain this performance consistently without operator intervention between the specified service intervals. For operators who need a direct-fit replacement for a worn Comer L-25J unit, this gearbox provides a precise OEM-equivalent specification match including identical spline profiles, mounting bolt patterns, and shaft dimensions, enabling a like-for-like swap in the field with standard agricultural hand tools.

A PTO drive shaft, also called a Power Take-Off shaft, is a mechanical drivetrain component that transfers rotational power from a tractor or engine directly to an attached implement or piece of equipment. Rather than requiring every piece of farm machinery to carry its own engine, the PTO shaft lets a single tractor power a wide range of tools, from rotary tillers and flail mowers to wood chippers, balers, and fertilizer spreaders. PTO shafts are standardized at common operating speeds of 540 r/min (for lighter agricultural implements) and 1000 r/min (for higher-power implements), with corresponding standard spline profiles including the 1.3/8-6 spline used by the L-25J gearbox input shaft.

PTO shafts incorporate universal joints (U-joints) at each end to accommodate the angular offset between the fixed tractor PTO output and the moving implement hitch point. Telescoping tube sections allow the shaft to extend and retract as the implement raises and lowers on the three-point linkage or as it articulates during headland turns. A safety shield covers the rotating shaft and should always be in place during operation to protect operators from entanglement risk.

The PTO shaft connects the tractor power source directly to the L-25J gearbox input shaft via the standard 1.3/8-6 spline coupling. The tractor engages the PTO at the rated 540 r/min, and this rotational speed travels down the PTO drive shaft through its universal joints to the gearbox input. Inside the gearbox, the bevel gear pair converts this input at the 1:1.9 ratio, delivering a higher output speed and proportionally reduced torque to the spreading disc.

The quality and condition of the PTO shaft directly affects gearbox health: worn universal joints create cyclic speed fluctuation that causes vibration and gear tooth fatigue inside the gearbox. Excessive PTO shaft angle beyond the rated universal joint limits causes similar speed variation. For this reason, CMN Transmission recommends inspecting PTO shaft universal joints for play and wear at each season start, and confirming that the PTO shaft is the correct length and series rating for the spreader model before installation.

CMN Transmission supplies a complete range of PTO shafts, universal joints, yokes, and torque limiters compatible with the L-25J gearbox and the broader range of agricultural implements in our product portfolio. Contact our technical team to confirm the correct PTO shaft specification for your tractor model and spreader configuration.

Why Choose CMN Transmission's Fertilizer Spreader Gearboxes?

Korea CMN Transmission Co., Ltd. was established in 2000 and is located in Sandan-o, Danwon-gu, Ansan-si, Gyeonggi-do, Korea. With 100+ factory employees dedicated to the research, development, manufacturing, sales, and service of agricultural gearboxes, CMN Transmission has grown into a reliable global supplier over more than two decades of continuous operation. Exporting to 60+ destinations worldwide, CMN Transmission brings deep engineering expertise and consistent manufacturing quality to every product in our catalog.

Our product range covers 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, center 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, and poultry feeding gearboxes, along with custom agricultural gearboxes covering nearly one thousand specifications. These products are widely used in grain harvesting equipment, forage machinery, mowers, balers, rakes, rotary tillers, fertilizer spreaders, sprayers, feed mixers, silage machines, and combine harvesters across global markets.

CMN Transmission's broader product portfolio also includes PTO shafts, universal joints, yokes, tubes, torque limiters, covers, adapters, couplings, bearings, blades, chains, and sprockets, enabling us to supply complete driveline solutions rather than individual components alone. With annual production exceeding 500,000 units, CMN Transmission consistently delivers reliable performance and long-term durability for global OEM manufacturers and aftermarket distributors.

All products are manufactured under CE and ISO 9001 certified quality management systems, ensuring consistent dimensional accuracy, material specification compliance, and performance reliability across every batch. 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, with extensive experience providing technical solutions for agricultural machinery partners across every major farming region in the world.

For fertilizer spreader gearbox suppliers and OEM procurement teams, CMN Transmission supports custom production based on customer drawings and specifications. Whether you need a direct Comer replacement like the L-25J, a modified ratio configuration, a custom housing mounting pattern, or a branded private-label product for your distribution network, our engineering team has the capability to support your requirement from prototype through volume production. When you choose CMN Transmission, you gain access to a proven manufacturer with two decades of agricultural gearbox expertise, a global logistics network, and a technical support team that understands the operational demands your equipment faces in the field every day.

Frequently Asked Questions

Q: Is the CMN L-25J a direct replacement for the Comer L-25J fertilizer spreader gearbox?
A: Yes. The CMN L-25J is engineered as a direct-fit Comer L-25J replacement, matching the same 1:1.9 gear ratio, 1.3/8-6 input spline profile, 22 mm output shaft diameter, and mounting bolt pattern. This enables a like-for-like installation on all spreader models originally equipped with the Comer L-25J without modification. Always verify the mounting dimensions and shaft specifications against your specific machine before ordering if the spreader has been modified from its original configuration.

Q: What oil should I use in the L-25J fertilizer spreader gearbox, and how do I check the oil level?
A: Use SAE 80W-90 gear oil as specified. To check the fertilizer spreader gearbox oil level, place the spreader on level ground, remove the oil level plug (located on the side of the housing), and verify that oil is present at the plug opening. The gearbox should be at ambient temperature during the check. Maximum oil capacity is 0.35 L. Top up with 80W-90 if the level is below the plug. Avoid overfilling, as excess oil can pressurize the housing and accelerate seal failure.

Q: What is the correct fertilizer spreader gearbox ratio for centrifugal disc spreading?
A: The L-25J operates at a fertilizer spreader gearbox ratio of 1:1.9, meaning the output shaft rotates at 1.9 times the input speed. At the standard 540 r/min PTO input, this produces approximately 1,026 r/min at the output shaft. This speed range is optimal for centrifugal disc spreaders handling granular NPK fertilizers and lime at typical field spreading widths. Contact CMN Transmission if your spreader application requires a different ratio such as 1:1.35 or 1:1.0, as alternative configurations are available.

Q: Can this gearbox be used with a 1000 r/min PTO instead of 540 r/min?
A: The L-25J is rated for a maximum input rotation speed of 540 r/min. Operating the gearbox at 1000 r/min PTO speed will exceed the rated limits and significantly shorten bearing and gear life, and may cause seal failure from elevated internal pressure. If your tractor only has a 1000 r/min PTO output, contact CMN Transmission for advice on a compatible gearbox specification or the use of a PTO speed reduction adapter to bring the input speed within the rated range.

Q: How long will the L-25J fertilizer spreader gearbox last under normal operating conditions?
A: With correct oil fill at installation, first oil change at 50-70 hours, and subsequent 500-hour or annual oil changes, users report 1,500 to 3,000+ operating hours of service life from the L-25J under normal agricultural spreading conditions. Lifespan is heavily influenced by oil maintenance discipline, avoidance of PTO overspeed, correct overload protection in the driveline, and post-season cleaning to remove fertilizer deposits that can attack seals and housing surfaces during storage.

Q: Do I need a slip clutch or overload protection device with this gearbox?
A: CMN Transmission strongly recommends using a PTO shaft fitted with an appropriate slip clutch or shear bolt overload protection device between the tractor PTO output and the gearbox input. The L-25J's 1000 N·m torque rating provides working capacity, not overload protection. If the spreading disc strikes an obstacle or a material jam occurs, unprotected shock torque can damage internal gears and bearings in a single event. Overload protection preserves the gearbox investment and is standard practice on all professionally configured spreader drivelines.

Q: Can CMN Transmission supply fertilizer spreader gearboxes in bulk for OEM manufacturers or distributors?
A: Yes. CMN Transmission is an established OEM and aftermarket fertilizer spreader gearbox manufacturer with annual production exceeding 500,000 units across all product lines. Bulk orders with custom branding, modified specifications, or specific packaging requirements can be accommodated through our OEM program. Distributor pricing tiers and minimum order quantities are available on request. CMN Transmission's CE and ISO 9001 certified production management ensures consistent quality across high-volume orders.

Q: How do I correctly fill the L-25J gearbox with oil for the first time?
A: Install the gearbox on the spreader frame in its operating position. Remove the oil fill plug on the top of the housing. Pour SAE 80W-90 gear oil slowly into the fill port until oil reaches the level plug opening on the side of the housing, indicating the correct 0.35 L fill level. Refit both the fill and level plugs securely. Run the gearbox at low speed for a few minutes, then shut down and recheck for leaks at both plugs and shaft seal exits before proceeding to field operation.

Q: What are the main agricultural gearbox types available from CMN Transmission?
A: CMN Transmission manufactures a comprehensive range of agricultural gearboxes including fertilizer spreader gearboxes, flail mower gearboxes, rotary tiller gearboxes, rotary cutter gearboxes, post hole digger gearboxes, round and square baler gearboxes, disc mower gearboxes, feed mixer gearboxes, silage machine gearboxes, combine harvester gearboxes, and irrigation gearboxes, covering nearly one thousand specifications. Custom agricultural gearboxes based on customer drawings or OEM samples are also available. Contact CMN Transmission's technical team to discuss your specific gearbox requirements.

Q: What mounting configurations are available for the L-25J from Comer, and does the CMN replacement match them?
A: According to the Comer L-25J technical catalog (Code 124.8, section 3.02), the original gearbox is available in multiple shaft and mounting configurations including 1" 3/8 Z6 input splines and various Z output combinations. The CMN L-25J is supplied in the standard configuration matching the most common market variant. If your spreader uses a non-standard Comer variant, contact CMN Transmission with the Comer code number from your original gearbox label and we will confirm compatibility or identify the correct replacement specification from our range.

Customer Reviews

Alejandro Rodriguez | 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-25J mid-season and honestly could not 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 was clean inside, no metal particles, no wear at all. Very impressed with the quality at this price point."

James Harrison | Grain Farming | United Kingdom
"Been running Comer gearboxes for years but the cost of OEM replacements has gotten ridiculous. Tried the CMN L-25J as a replacement on one of our Amazone ZA-M spreaders and I genuinely cannot tell the difference in the field. Spread pattern is spot on, no vibration, fits perfectly. Ordered three more for the season after that. The customer service team answered my technical questions about the mounting dimensions quickly too, which made the decision easy. Would definitely recommend to other contractors looking to reduce parts costs."

Klaus Müller | Crop Farming | Germany
"Ordered two L-25J units to replace worn gearboxes on our Rauch spreaders before the autumn application window. Shipping to Bavaria was faster than expected, about 12 days, and the packaging was solid with no transit damage. Spline fit was correct, oil seals looked high quality, and after filling with 80W-90 as specified they ran smoothly from day one. We put about 200 hours on them through the season spreading compound NPK and lime with no issues. Will be our go-to replacement source from now on. Sehr gut."

Marco Vitale | Horticulture & Nurseries | Italy
"I use these gearboxes on compact spreaders for our vegetable and greenhouse operations. The aluminium housing is perfect for our indoor climate where standard iron gearboxes rust fast. The 22mm output shaft fitted our disc hub directly without any modification. I was initially skeptical about a Korean replacement for the Comer original but the quality is genuinely comparable. Weight is just 4.1 kg which matters when you are moving equipment around a busy nursery. Placed a second order after six months of trouble-free use."

David Patterson | Pasture Management | Australia
"Needed a gearbox urgently mid-season for topdressing pastures before the autumn break and the CMN team organized express shipping to Victoria that got it here in time. Fitted straight onto our old spreader frame, 1.3/8 spline matched perfectly to our driveshaft. Been spreading lime and superphosphate for about 300 hours since fitting. The aluminium housing handles our wet conditions far better than the old iron unit did and the seals show no signs of fertilizer leakage. Will be recommending CMN to other farmers in our district."

Pierre Laurent | Vineyard Maintenance | France
"We use these on our inter-row spreaders in the vineyards for potassium and micronutrient application. The price is significantly better than sourcing through local dealers and the quality has been excellent. Two units running now for a full season without any problems, which is impressive given we work on slopes where vibration from uneven ground is hard on equipment. The technical datasheet they provided showed all the dimensions clearly which made it easy to confirm fit before ordering. Fast response to email questions too."

Robert Thompson | Agricultural Machinery | Canada
"We stock the CMN L-25J gearboxes as a service part for customer spreaders and the sell-through has been very strong. Price point is about 35% lower than OEM Comer and quality has been consistent across every unit we have sold. No warranty returns in two seasons which says everything you need to know. Packaging is good for retail display. CMN's technical support documents are detailed enough that our parts staff can answer customer fitment questions without needing to escalate. Shipping from Korea to Ontario has consistently been 10 to 14 days."

Ravi Sharma | Sugar Cane Farming | India
"Difficult to source quality gearbox parts in our region so we ordered directly from CMN. The L-25J arrived well packed and the spline matched our PTO driveshaft without any adapter needed. We use it on a disc spreader for urea and potash application across about 80 hectares per season. Runs hot here but the aluminium housing handles heat well. Oil level easy to check and change. Communication with CMN was good throughout. Would order again and have already passed the contact details to two neighboring farmers who need the same part."

Carlos Martinez | Golf Course Management | Spain
"We use a PTO-driven spreader for fertilizer applications across the course fairways and rough areas. Our old Comer gearbox was becoming unreliable and the OEM replacement price was difficult to justify. The CMN L-25J arrived quickly, installed without any issues, and the disc speed on our spreader is identical to what we had before with the original unit. After one full season of use across about 40 hectares of turf we have had zero problems. The gearbox exterior cleans up easily after each use which matters for presentation on a golf property. Very satisfied."