T-281A Fertilizer Spreader Gearbox Ratio 1:1 Replacement for Comer T-281A Gearbox

The T-281A Fertilizer Spreader Gearbox Ratio 1:1 Replacement for Comer T-281A Gearbox, also known as a fertilizer distributor gearbox, is an essential component of agricultural machinery, specifically engineered for soil preparation, crop treatment, and precise fertilizer spreading. Positioned at the mechanical heart of the spreader, it transmits rotational power from the tractor's Power Take-Off (PTO) directly to the spinning discs or augers that distribute fertilizer uniformly across the field. With a direct 1:1 ratio, a maximum input power of 16.9 kW (23 HP), and a maximum output torque of 290 N·m, this agricultural gearbox ensures consistently reliable performance under demanding field conditions. The lightweight aluminium housing (7 kg) combined with a robust internal gear arrangement makes it a versatile and field-proven choice.

Designed as a direct drop-in replacement for the original Comer T-281A unit, this gearbox for fertilizer spreader applications accepts standard 1-3/8" Z6 PTO spline input and delivers output through dual 30 mm connection shafts, making retrofitting fast and straightforward. Whether fitted on broadcast spreaders for large arable farms, pasture management rigs, or specialty horticulture equipment, the CMN T-281A delivers consistent torque transfer and long service life. As one of the leading fertilizer spreader gearbox manufacturers, CMN Transmission supplies this unit to OEM partners and independent distributors across 60+ countries, backed by ISO 9001 quality management and CE certification.

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.

T-281A Fertilizer Spreader Gearbox Dimensions

Key Features of the T-281A Fertilizer Spreader Gearbox 1:1

1. PTO Interface and Spline Compatibility
The input shaft is precision-machined to the universal 1-3/8" Z6 spline standard, ensuring a direct, vibration-free fit to any tractor PTO output operating at 540 r/min. Correct PTO matching is critical: it eliminates lateral runout, prevents premature bearing wear, and removes the need for adapters. The CMN T-281A mates with standard PTO driveshafts right out of the box, dramatically reducing installation time and misalignment risk in field conditions.

2. 1:1 Ratio Configuration and Dual Output Options
With a direct 1:1 fertilizer spreader gearbox ratio, this unit preserves full PTO speed at the output shaft, ensuring spinner discs or agitators operate at the exact RPM required for consistent broadcast spread patterns. Both output connections (30 mm diameter) support different disc mounts and twin-disc configurations, giving machine builders flexibility to adapt the gearbox to a wide range of spreader frame designs without custom modifications.

3. Corrosion-Resistant Aluminium Construction
Fertilizer compounds are inherently corrosive to metal components. The T-281A housing is die-cast in high-strength aluminium alloy, which provides excellent resistance to chemical attack from ammonium nitrate, urea, and compound NPK granules. Sealed bearings and precision-fit oil seals prevent ingress of fertilizer dust and moisture, significantly extending the service life of internal gears compared to uncoated ferrous housings found in lower-grade agricultural gearbox for fertilizer spreader alternatives.

4. Agitator and Disc Drive Integration
The dual-output shaft arrangement (connections X and Z, each 30 mm) makes it straightforward to simultaneously drive an agitator and the primary spreading disc from a single power source. Agitators are essential for preventing fertilizer bridging in the hopper, especially with hygroscopic granules or pelletized products in humid conditions. This integrated approach reduces mechanical complexity, eliminates the need for additional gearboxes or chain drives, and lowers the overall weight of the spreader assembly.

5. Field Serviceability and Easy Maintenance
Accessible fill, drain, and level plugs allow the operator to check and change the 80W-90 gear oil without disassembling the unit. The recommended fertilizer spreader gearbox oil level capacity is 0.5 L, with the first oil change due at 50-70 operating hours, then every 500 hours or annually. Breather vents prevent pressure build-up during thermal cycling, reducing seal stress. All service points are reachable with standard agricultural tools, making routine maintenance practical even in remote field locations.

6. Direct OEM-Grade Replacement Compatibility
Engineered to match the original Comer T-281A dimensional envelope, bolt pattern (N.4 x Ø11 mm, 78 mm PCD), and shaft specifications, the CMN T-281A drops directly into existing spreader frames without modification. As a global fertilizer spreader suppliers network member, CMN Transmission maintains consistent production standards across all units, so OEM integrators and agricultural dealers can specify this gearbox with confidence across repeat orders and multiple machine lines.

How Does the T-281A Fertilizer Spreader Gearbox Work

The operating cycle begins when the tractor's PTO shaft engages and transmits rotational energy at 540 r/min through the universal 1-3/8" Z6 spline interface into the gearbox input shaft. The input shaft is precision-balanced and supported by sealed deep-groove ball bearings at both ends. This bearing arrangement absorbs radial loads imposed by PTO driveshaft angularity while maintaining accurate shaft alignment, which is the foundational requirement for quiet, vibration-free operation of any fertilizer gearbox.

Inside the die-cast aluminium housing, the input shaft drives a bevel or spiral-bevel gear set arranged in a 5-6 tooth configuration. This gear arrangement converts the axial input rotation into the correct output orientation while maintaining the 1:1 speed ratio. The gears are case-hardened to ensure resistance to surface fatigue and pitting under cyclic loading. Gear tooth geometry is optimised to deliver smooth meshing across the full torque range up to 290 N·m, reducing noise and heat generation during extended spreading operations. The 80W-90 gear oil film, maintained at a capacity of 0.5 L, ensures hydrodynamic lubrication across all meshing surfaces even during sustained heavy-duty passes.

Torque exits the gearbox through two 30 mm output shafts (connection points X and Z as per Comer 9.281 series drawing convention). The main output drives the spreading disc or auger, while the secondary output can simultaneously power an agitator to keep fertilizer granules in constant motion within the hopper. This dual-drive capability eliminates the material bridging and uneven flow issues common in single-disc spreaders when handling dense or humid granular materials. The output shafts rotate at the same 540 r/min as the input, maintaining the precise disc speed needed for consistent spread width and application rate.

The aluminium housing acts as a combined structural frame and thermal radiator, dissipating the modest heat generated at 16.9 kW input power. Radial lip seals on all three shaft exits prevent fertilizer dust, crop debris, and moisture from entering the gear cavity. A breather vent equalises internal pressure as the oil heats and cools through the working cycle, preventing pressure differentials that could force oil past the seals. Together, these protective systems ensure that the fertilizer spreader gearbox maintains its sealing integrity season after season.

Correct lubrication is the primary determinant of fertilizer spreader gearbox service life. The 0.5 L oil bath is filled before first use with SAE 80W-90 gear oil. At initial run-in (50-70 operating hours), microscopic metallic debris from gear and bearing bedding-in accumulates in the oil; the first oil change removes this contaminant load before it causes accelerated abrasive wear. Subsequent changes every 500 hours (or annually, whichever comes first) maintain oil viscosity and additive package integrity. The clearly marked fill and level plugs simplify this fertilizer spreader gearbox oil level management process, keeping service time to a minimum even in high-throughput farming operations.

Application Areas

T-281A Gearbox Components

Gearbox Housing
Die-cast from high-strength aluminium alloy, the housing provides the structural skeleton of the entire gearbox assembly. It integrates the bearing seats, oil bath cavity, and shaft seal landings into one rigid unit. Aluminium's thermal conductivity helps dissipate heat generated by gear mesh friction, reducing operating temperatures and protecting internal components during sustained full-load operation in warm conditions.

Input Shaft
The input shaft is machined to the 1-3/8" (six-spline Z6) profile and accepts the standard PTO driveshaft yoke without adapters. It is case-hardened to withstand the repeated shock loads inherent in PTO engagement and disengagement. The shaft is supported by a pair of pre-lubricated sealed bearings that handle both radial and axial forces from the gear mesh, ensuring long, maintenance-free service in this critical interface between tractor and implement.

Bevel Gears
A matched pair of precision-ground bevel gears (gear arrangement 5-6) changes the direction of power transmission while maintaining the 1:1 ratio. The gears are manufactured from case-hardened alloy steel with a high surface hardness to resist contact fatigue over millions of load cycles. Tight dimensional tolerances on tooth profile, pitch, and helix angle ensure quiet meshing and even load sharing across the full face width at maximum torque.

Output Shafts (X and Z)
Both output shafts measure 30 mm outside diameter and are machined to tight cylindrical tolerances for secure coupling to spreading discs, agitator flanges, or additional driveline components. The dual-output design (positions X and Z per Comer drawing convention) enables simultaneous drive of two independent working elements, doubling functional output without adding a second gearbox. Shaft ends are chamfered for easy coupling engagement in the field.

Bearings
Pre-lubricated deep-groove ball bearings or tapered roller bearings are fitted at each shaft journal within the housing. These bearings are selected to carry the combined radial load from gear mesh forces and axial thrust generated by bevel gear geometry. Factory-set preload and precision-machined bearing seats ensure that shaft deflection under peak torque remains within the limits needed to maintain correct gear tooth contact patterns across the full life of the unit.

Oil Seals
Radial lip seals, manufactured from nitrile or fluorocarbon rubber compounds, are pressed into the housing at all three shaft exit points. Their primary function is to retain the 80W-90 gear oil within the housing while simultaneously blocking the ingress of fertilizer dust, plant matter, and field moisture. Replacement seals are standard metric components available from agricultural bearing distributors worldwide, keeping fertilizer spreader gearbox parts sourcing straightforward.

Lubrication System
The lubrication system comprises an oil bath, fill plug, level plug, drain plug, and breather vent. The 0.5 L oil bath provides splash lubrication to all gear and bearing surfaces during operation. The breather vent prevents internal pressure build-up from thermal expansion, a common cause of seal failure on unvented gearboxes. Fill, drain, and level plugs are positioned for ergonomic access, allowing a single operator to complete an oil change in under 15 minutes without specialist tools.

How to Replace the T-281A Fertilizer Spreader Gearbox

1. Safety Isolation and Machine Preparation
Before any disassembly, disengage the PTO, switch off the tractor engine, and apply the handbrake. Allow the spreader and gearbox to cool completely if recently operated. Place chocks under the spreader wheels and disconnect the PTO driveshaft from the gearbox input. Always wear appropriate PPE including eye protection and chemical-resistant gloves when working around fertilizer residues on the spreader components.

2. Remove the Spreading Discs and Agitator
Unbolt the spinning disc(s) from the gearbox output shafts and set aside. If the spreader is equipped with an agitator, detach it from the secondary output shaft. Mark the original disc orientation with a paint pen or chalk before removal so they can be reinstalled in the same position, preserving the calibrated spread pattern. Store all fasteners in a labelled tray to prevent mixing with the new unit's hardware.

3. Drain the Old Gearbox Oil
Position a suitable drain tray beneath the old gearbox and remove the drain plug to empty the oil. Inspect the drained oil for metal particles, milkiness (indicating water ingress), or an unusually dark colour, as these symptoms can confirm the root cause of the failure and inform whether other driveline components should also be inspected. Dispose of old oil in accordance with local environmental regulations; never allow it to enter watercourses or drains.

4. Unbolt and Remove the Old Gearbox
Remove the four M10 mounting bolts (N.4 x Ø11 holes on the 78 mm PCD flange). Support the old gearbox weight with a second person or a suitable lifting strap before extracting the final bolt, as the housing will drop when unsupported. Clean the spreader mounting face thoroughly with a wire brush to remove corrosion, old gasket material, and fertilizer encrustation, ensuring a flat, clean mating surface for the new unit.

5. Verify Dimensional Compatibility Before Installation
Before bolting the new CMN T-281A into position, confirm that the bolt hole pattern (N.4 x Ø11, 78 mm PCD), shaft diameters (30 mm output, 1-3/8" Z6 input), and overall housing envelope match the original Comer dimensions as shown in the dimensional drawing. Cross-check the Comer part code on the old unit against the 9.281.012 or equivalent code in the Comer catalogue to ensure shaft orientation (X, Y, Z positions) is identical to your application requirement.

6. Install and Torque the New Gearbox
Offer up the new T-281A to the spreader mounting face, aligning all four bolt holes. Start all four bolts by hand to ensure no cross-threading before applying torque. Tighten the mounting bolts in a cross pattern to the manufacturer-specified torque value (typically 40-50 N·m for M10 class 8.8 bolts) to ensure uniform flange clamping. Apply thread-locking compound to the bolt threads if the machine is subject to high vibration during normal operation.

7. Fill with Correct Gear Oil Before First Use
The CMN T-281A is supplied without oil. Before reconnecting the PTO driveshaft or starting the machine, fill the gearbox through the fill plug with SAE 80W-90 gear oil to the correct fertilizer spreader gearbox oil level. The maximum capacity is 0.5 L. Check the level plug to confirm oil is at the correct height. Operating the gearbox even briefly without oil will cause immediate and irreversible gear and bearing damage, invalidating any warranty claim.

8. Run-In Test and First Inspection
With the discs and agitator reinstalled, reconnect the PTO shaft and engage it briefly at low throttle for 5-10 minutes without load. Listen for abnormal noise and check for oil leaks around the seals and plugs. After the first 50-70 operating hours, perform the mandatory first oil change to flush run-in metallic debris. Following this break-in procedure is essential to achieving the maximum rated service life of the CMN T-281A fertilizer spreader gearbox.

Common Faults and Troubleshooting

Fertilizer Spreader Gearbox and PTO Drive Shaft

Fertilizer spreader gearboxes transfer rotational power from the tractor's PTO to the spinner discs or agitators that distribute fertilizer, seed, or granular soil amendments across the field. The gearbox reduces or maintains PTO speed, increases output torque as required by the specific ratio, and ensures consistent spreading performance regardless of tractor engine load fluctuations. Its durable, corrosion-resistant aluminium design withstands the harsh chemical environment created by nitrogen, phosphate, and potassium-based fertilizer compounds. As one of the central fertilizer spreader gearbox parts, the unit is the mechanical bridge between tractor power and precision agronomic output. Choosing the correct ratio, shaft configuration, and power rating from a qualified fertilizer spreader gearbox manufacturers source ensures many seasons of reliable service with minimal downtime.

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 manure spreaders. The standard agricultural PTO operates at 540 r/min (for lighter implements up to approximately 65 HP) or 1000 r/min (for heavy-duty implements on higher-powered tractors). PTO shafts consist of a telescoping two-part tube (allowing length adjustment as the implement moves relative to the tractor), universal joints at each end to accommodate angular misalignment, and a protective plastic or steel guard tube surrounding the entire assembly for operator safety. The 1-3/8" Z6 spline interface at each yoke is the global standard connection for tractors in the 40-100 HP class, which is exactly the profile the CMN T-281A gearbox input shaft is designed to receive.

The PTO shaft and the fertilizer spreader gearbox form an inseparable power transmission chain. The tractor PTO stub engages the driveshaft yoke, and the driveshaft's opposite yoke connects to the gearbox input shaft spline. As the tractor engine runs, PTO power flows through this chain at up to 16.9 kW and 540 r/min, entering the T-281A housing and exiting through the dual output shafts to drive the spreading mechanism. The telescoping driveshaft accommodates the three-point linkage height variation as the tractor navigates uneven terrain, while the universal joints absorb the angular offset between tractor and implement mounting points. Correct PTO shaft length selection is critical: a driveshaft that is too short can pull apart at full linkage extension, while one that is too long can bottom out at minimum height and bend, creating dangerous imbalance forces. Always verify the minimum overlap of the inner and outer telescoping tubes is maintained at maximum extension, as specified by the PTO shaft manufacturer.

For the CMN T-281A running at 540 r/min, the PTO driveshaft must be rated for the same power as or higher than the gearbox input rating of 16.9 kW (23 HP). The shaft should feature 1-3/8" Z6 yokes at both ends, a safety guard tube and cone guards over the universal joints, and a CE-marked shear bolt or slip clutch overload protection device installed between the tractor PTO stub and the driveshaft to protect the gearbox from sudden torque spikes. When selecting an overload clutch setting, calibrate it to disengage at approximately 120-130% of the gearbox rated torque (around 350-380 N·m for the T-281A) to provide adequate protection without nuisance tripping during normal spreading operations. Contact CMN Transmission's technical team for recommendations on matched PTO driveshaft assemblies for specific tractor and spreader combinations.

Fertilizer Spreader Gearbox vs Rotary Tiller Gearbox

Comparison Table

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 more than 100 factory employees, CMN Transmission is dedicated to the research and development, manufacturing, sales, and after-sales service of agricultural gearboxes across the full spectrum of farm machinery categories.

Over the past two decades, CMN Transmission has grown into a globally recognised supplier in the agricultural gearbox industry. Our product range includes 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 fully custom agricultural gearbox solutions covering nearly 1,000 specifications.

With an annual production volume exceeding 500,000 units, CMN Transmission consistently delivers reliable performance and long-term durability to global OEMs and distributors. 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, and New Zealand, with extensive experience providing technical solutions for agricultural machinery partners worldwide. As a leading choice among fertilizer spreader suppliers and fertilizer spreader gearbox manufacturers, CMN Transmission is your long-term partner for reliable agricultural power transmission.

• 25+ Years of Manufacturing Experience
  Founded in 2000 in Ansan, Korea, CMN Transmission has over two decades of dedicated agricultural gearbox R&D and manufacturing experience, with a factory workforce of 100+ and annual output exceeding 500,000 units.
• Export to 60+ Countries
  CMN Transmission exports to the United States, Canada, Germany, France, the United Kingdom, Brazil, Argentina, Australia, India, Turkey, and many other markets, with established logistics routes and import documentation expertise for each destination.
• CE and ISO 9001 Certified
  Full CE marking for EU market access, ISO 9001 Quality Management, Environmental Management, and Occupational Health and Safety certifications confirm that every unit leaving the CMN factory meets internationally recognised design and production standards.
• 1,000+ Specifications Available
  CMN's product catalogue covers nearly 1,000 specifications across rotary cutter, rotary tiller, flail mower, round baler, disc mower, silage, combine harvester, and fertilizer spreader gearboxes, enabling OEM customers to standardise on a single trusted supplier across multiple machine lines.

Frequently Asked Questions

Q: What oil should I use in the T-281A fertilizer spreader gearbox, and how often should I change it?
A: Use SAE 80W-90 mineral gear oil. The maximum oil capacity is 0.5 L. The gearbox is supplied dry, so you must fill it with oil before first use. Perform the first oil change after 50-70 operating hours to remove metallic break-in debris. Subsequently change the oil every 500 hours or at least once per year, whichever comes first. Always check the fertilizer spreader gearbox oil level at the start of each season and before extended working shifts. Never mix oil grades or use hydraulic fluid as a substitute.

Q: Is the CMN T-281A a direct replacement for the original Comer T-281A gearbox?
A: Yes. The CMN T-281A is engineered to match the original Comer T-281A dimensional envelope, bolt hole pattern (N.4 x Ø11 mm on a 78 mm PCD flange), shaft diameters (30 mm outputs, 1-3/8" Z6 input), and the Comer 9.281 series mounting geometry. It drops into existing spreader frames without requiring modification to brackets, shaft couplings, or disc mounts. Before installation, cross-reference the Comer part code on your old unit with the shaft orientation (X, Y, Z positions) shown in the dimensional drawing to confirm the configuration matches your specific spreader model.

Q: What is the fertilizer spreader gearbox ratio of the T-281A, and can I get other ratios?
A: The T-281A is a 1:1 ratio unit, meaning the output shafts rotate at the same speed as the PTO input (540 r/min). CMN Transmission also manufactures gearboxes in the Comer 9.281 series with ratios of 1.35:1, 1.46:1, 1.84:1, 2.16:1, and 2.91:1 to achieve different disc RPMs for specific spreading applications. Contact our sales team for the full range of ratio options and their corresponding Comer code equivalents. Custom ratios may be available on request for OEM volume orders.

Q: What is the maximum power and torque the T-281A agricultural gearbox can handle?
A: The T-281A is rated for a maximum input power of 16.9 kW (23 HP) at 540 r/min, with a maximum output torque of 290 N·m. Operating continuously above these ratings will cause premature gear wear, bearing failure, and potential housing fracture. If your tractor or application requires higher power, contact CMN Transmission for a heavier-duty agricultural gearbox recommendation. Always install a PTO driveshaft with an appropriate overload clutch to protect the gearbox from instantaneous torque spikes during start-up or disc impact.

Q: Where can I find fertilizer spreader gearbox parts for the T-281A for maintenance or repair?
A: Common wear parts for the T-281A including radial lip seals, deep-groove ball bearings, and breather vents are standard metric components available from agricultural bearing suppliers and industrial parts distributors worldwide. Oil seals are sized to ISO metric standards and can be sourced from brands such as SKF, FAG, or equivalent. CMN Transmission can supply original replacement components including complete inner gear sets on request for high-volume service operations. Contact our technical support team with your unit's production serial number for an accurate parts reference list.

Q: Does the T-281A come with oil already filled, and what should I do before first start?
A: No, all T-281A units are supplied without oil for shipping safety and to comply with international freight regulations. Before connecting the PTO shaft or starting the machine, you must fill the gearbox with 0.5 L of SAE 80W-90 gear oil through the fill plug. Confirm the oil reaches the correct level by checking the level plug. Running the unit even briefly without oil will cause catastrophic internal damage. After filling, replace the fill plug and ensure it is tight before engaging the PTO.

Q: What spreader brands and models is the T-281A compatible with besides Comer?
A: The T-281A is designed as a replacement for Comer T-281A units, but its dimensional compatibility also makes it suitable for use in many third-party spreaders built around the Comer 9.281 series mounting standard, including equipment from manufacturers such as Vicon, Amazone, Bogballe, Sulky, and various regional OEMs that standardised on the Comer 9.281 bolt pattern and shaft specification. Always verify the four bolt hole positions, shaft output orientation (X/Z), and housing dimensions against your original unit before ordering. Our technical support team can assist with compatibility verification if you provide the original part number or spreader model details.

Q: Can I use the T-281A fertilizer spreader gearbox for applications other than fertilizer spreading?
A: Yes. The T-281A's specification (540 r/min, 16.9 kW, dual 30 mm output shafts, 1-3/8" Z6 input) suits a range of agricultural power transmission applications beyond fertilizer spreading. The Comer documentation lists compatible uses including mowers, multi-row rotary tillers, and band saws. Seed broadcasters, some manure spreaders, and irrigation reel drives with similar power and speed requirements may also be compatible. Verify that the application's torque demand does not exceed 290 N·m and that operating speed does not exceed 540 r/min at the input shaft.

Q: How do I determine the correct fertilizer spreader gearbox ratio for my spreading disc?
A: The required disc RPM is determined by the spreader manufacturer's specification for the desired working width and application rate. With a standard 540 r/min PTO, a 1:1 gearbox delivers 540 r/min to the disc, while a 1.84:1 gearbox delivers approximately 293 r/min. If your spreader disc is designed for a specific RPM that does not match your current gearbox output, switching to the correct ratio is the easiest adjustment. CMN Transmission manufactures gearboxes across the full Comer 9.281 ratio range (1:1 to 2.91:1). Contact us with your disc diameter and target spread width for a ratio recommendation.

Q: What certifications does the CMN T-281A fertilizer distributor gearbox hold?
A: CMN Transmission holds CE marking (required for sale in the European Union), ISO 9001 Quality Management System certification. These certifications confirm that the T-281A is designed, manufactured, and quality-controlled to internationally recognised standards. For distributors and OEM customers in regulated markets, CMN can supply copies of the relevant certification documentation and test records upon request as part of the order process.

Customer Reviews

James, Arable Crop Farming, United States
"We run about 1,400 hectares of corn and wheat out here in Iowa and we go through a fair amount of fertilizer in the spring season. Had the original Comer gearbox on one of our Bogballe spreaders crack at the housing after 3 seasons -- ordered two CMN T-281A units as replacements and honestly couldn't be happier. The splines matched perfectly to our existing PTO shafts, bolted straight in with zero modification. Did the first oil change at around 60 hours just like the instructions said and the oil looked totally clean inside. Now at about 280 hours and both units are running smooth. Good product, good price."

David, Pasture Management, Canada
"We manage about 800 ha of mixed pasture and hay in Ontario and switched to CMN gearboxes two seasons ago after a local dealer recommended them. The T-281A 1:1 ratio has been great for our twin-disc Amazone spreader. It arrived in Toronto in about 12 days, well packaged and no damage. The aluminium housing is noticeably lighter than the old cast iron one we pulled off, which I think actually helps with our smaller tractor on the slope ground. Very solid unit."

Renato, Soy Farming, Brazil
"Soy and sunflower farm in Mato Grosso, we needed three replacement gearboxes for our fleet of spreaders before the main fertilizer window in September. CMN got the order processed fast and shipment arrived in Cuiaba within 18 days which was better than I expected for international freight. One of the three units had a slightly sticky drain plug on arrival but that was sorted with a spanner -- nothing serious. All running fine, 1:1 ratio was exactly what we needed for our existing disc configuration. Would order again."

Klaus, Agricultural Machinery Dealer, Germany
"We are an agricultural machinery dealer in Bavaria and we've been sourcing replacement gearboxes from CMN Transmission for about two years now. The T-281A is by far our best seller for Comer replacements. Quality is consistently good, dimensions are accurate to the original, and customers rarely come back with complaints. We stock ten units at a time and they always move quickly in spring and autumn. Delivery to our warehouse in Munich typically takes under three weeks, which is workable for our planning cycles."

Thomas, Rapeseed Farming, United Kingdom
"I run a 200-hectare mixed cereal and rapeseed farm in Yorkshire and bought two T-281A units as preventive spares for our Vicon spreader this spring. Fitted one straightaway to replace a unit that was leaking oil from the seal. The process was dead simple -- four bolts, same shaft sizes as the original, had it sorted in under an hour in the field without bringing the spreader back to the yard. The technical support from CMN was also helpful when I had a question about the oil grade. Recommend them to any farmer looking for fertilizer spreader gearbox for sale at a fair price."

Pierre, Large-Scale Crops, France
"A 600-hectare arable farm in the Beauce region. We replaced two fertilizer gearboxes last March with CMN T-281A models. The manufacturing quality is very decent, the bearings are quiet, and the 1:1 ratio is perfect for our disc spreaders. Delivery to France took about 16 days. The after-sales service responded quickly to our questions by email. Very satisfied with these agricultural gearboxes for our spreaders."

Andrew, Agricultural Parts Distributor, Australia
"We distribute agricultural parts across New South Wales and have been trialing CMN gearboxes as a Comer alternative for our customers. The T-281A passed our bench checks on dimensions and torque capacity. Have sold about 15 units to farmers in the past season -- only had one return, which turned out to be operator error (ran it dry). CMN's documentation on the first oil fill is clear but some farmers skip it. Overall, solid product, reasonable lead time to Sydney, and the CE certification documentation is clean which matters for our compliance customers."

Alejandro, Wheat and Soybean Farming, Argentina
"900-hectare farm in the province of Buenos Aires, mainly wheat and soybeans. We bought four T-281A units to replace the original gearboxes on our seeder-fertilizers. They arrived in good condition in Buenos Aires in approximately 20 days. The 1-3/8 Z6 splines fit perfectly with the existing drive shafts. After 150 hours of work with urea and MAP, there are no oil leaks or excessive heating. The value for money is very good for a fertilizer multiplier gearbox with these specifications."

Mehmet, OEM Machinery Manufacturer, Turkey
"We are an OEM manufacturer of spreader machines in Konya and use CMN gearboxes as standard fitment on our mid-range spreader line. Have been sourcing T-281A units for three years now -- the consistency between batches is very good which is important for production line assembly. CMN's technical team helped us confirm the correct shaft orientation (X and Z output positions) for our frame design before we placed the first order. Would recommend CMN to any Turkish OEM looking for reliable agricultural gearbox suppliers with solid export documentation."