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Agricultural Gearbox Solutions — United Kingdom
Horizontal Feed Mixer Gearbox D732A 1:1 / 1.93:1
A precision-engineered, direct replacement for Comer D732A — built for UK dairy, sheep, and livestock feed operations demanding reliability, power, and zero compromise on uptime.
The Horizontal Feed Mixer Gearbox D732A is a high-performance, drop-in replacement for the Comer D732A gearbox, purpose-built for mixing wagon applications across the UK agricultural sector. Rated at a maximum input power of 59 kW (80 HP), it delivers a gear ratio of 1:1.93, making it well-suited for the heavy continuous loads encountered in livestock feed processing. The cast iron GG25 housing, precision-machined gears, and reinforced bearing seats collectively ensure the unit maintains operational stability across extended working seasons — from the lambing runs of the Scottish Borders to large-scale dairy operations in Somerset and Cheshire. Whether you are running a Kuhn, Trioliet, Storti, or Jaylor mixing wagon, this gearbox integrates seamlessly, restoring full mechanical performance without costly machine downtime.
Dimensional Reference — D732A 1:1 / 1.93:1
Tekniske specifikationer
| Parameter | Specifikation |
|---|---|
| Gearbox Model | D732A (Replacement for Comer D732A) |
| Forholdsfaktor | 1:1 / 1:1.93 |
| Maks. indgangseffekt | 59 kW |
| Max. Output Power | 80 HP |
| Connection 1 (Input Shaft) | 1-3/8 inch, 6 splines |
| Connection 2 Outside Diameter | 60 mm |
| Husmateriale | Cast Iron GG25 |
| Olie SAE viskositetsgrad | 80W-90 |
| Max. Oil Capacity | 5.6 L |
| Første olieskiftinterval | 50–70 driftstimer |
| Efterfølgende olieskiftinterval | 500–700 hours or once annually |
| Anvendelse | Mixing wagon / horizontal feed mixer |
| Vægt | 63 kg |
| Leveres med olie | No (must be filled before first use) |
How the PTO-Driven Feed Mixer Gearbox Works
Understanding the working principle helps operators maintain the gearbox correctly and get the longest possible service life from it. The D732A receives rotational power through the PTO shaft connected to the tractor’s rear output, typically spinning at 540 RPM. Inside the gearbox housing, a helical or bevel gear set converts this input into the appropriate output speed and torque required to drive the horizontal mixing augers or paddles. The internal gear ratio of 1:1.93 means the output shaft rotates faster than the input — a deliberate design choice that ensures augers can deliver the vigorous churning action needed to fully homogenise dense, fibrous TMR (Total Mixed Ration) loads.
The cast iron GG25 housing provides a rigid, vibration-damping structure that keeps gear mesh geometry accurate under load — a critical factor for reducing tooth wear and noise. Precision-machined bearing seats ensure concentricity between the input and output shafts, eliminating the kind of micro-misalignment that accelerates seal degradation and oil leaks. The 80W-90 gear oil, held at a capacity of 5.6 litres, creates a pressurised lubrication film that protects all gear and bearing surfaces, even during high-torque starting loads on cold winter mornings on UK farms.
The operator controls mixing intensity directly through tractor throttle position. Reducing PTO speed allows gentler handling of delicate ingredients like wet silage, while full rated speed at 59 kW input handles tough batches containing compacted straw bales or root crops. This flexibility makes the horizontal feed mixer gearbox D732A a genuinely versatile piece of equipment across the full spectrum of UK livestock farming.
Key Advantages for UK Farm Operations
Direct Comer D732A Replacement
Identical mounting dimensions and shaft configurations mean no modification to your existing mixing wagon frame or PTO driveline. Fit, align, fill with oil — back to work the same day.
GG25 Cast Iron Durability
The grey cast iron GG25 housing resists cracking under repeated shock loads — the kind of stress that occurs every time a large rock or metal fragment enters the mixing drum on a busy UK farm.
Forlængede olieskiftintervaller
Routine maintenance is straightforward: first oil change at 50–70 hours, then every 500–700 hours or once per year. This low-intervention schedule suits the demanding workloads of UK mixed livestock units.
Optimised Mixing Homogeneity
The 1:1.93 output ratio delivers the auger speed needed for a consistent, lump-free TMR blend — directly improving dry matter intake uniformity and supporting milk yield targets in UK dairy herds.
Broad Farming Application
Equally at home in dairy, sheep, beef, goat, equine, and poultry feeding systems. UK contract feed mixing contractors report that a single unit handles multiple client farm types without adjustment.
Reduced Operating Noise
Precision-hobbed gear teeth and tight housing tolerances keep noise levels low — a practical benefit inside enclosed livestock buildings where operator exposure to machinery noise is subject to UK HSE guidelines.
UK Farm Application Scenarios
Across the United Kingdom, the horizontal feed mixer gearbox D732A sees daily use in some of the most demanding livestock feeding environments imaginable. In large-scale dairy units in North Yorkshire and Shropshire, mixing wagons loaded with silage, brewers’ grains, and mineralised concentrates run twice daily, seven days a week throughout the winter housing period. The gearbox’s 59 kW rated capacity provides adequate headroom even when wagons are loaded to maximum capacity with wet, dense silage that resists initial auger engagement.
In upland sheep enterprises in Wales and the Scottish Highlands, where farm tracks are rough and machinery is often operated in freezing temperatures, the GG25 housing’s thermal properties ensure the gearbox reaches working viscosity quickly even after cold overnight periods. The low-maintenance oil change schedule aligns with seasonal management windows — typically carried out during the quieter summer grazing months before the next housing season begins.
Equine livery yards and specialist hay replacer operations in the Home Counties and East Anglia have also adopted this gearbox as an aftermarket replacement, particularly where original Comer units have failed mid-season and rapid sourcing of a replacement is essential to avoid feed regime disruption. The fact that this unit ships without oil — requiring the operator to fill with the specified 80W-90 grade on arrival — is standard practice and ensures no oil degradation occurs during transit or storage.
Common Faults & Recommended Actions
| Symptom | Sandsynlig årsag | Anbefalet handling |
|---|---|---|
| Overdreven støj/vibrationer | Worn gears, loose bolts, damaged bearings | Inspect gear teeth and bearing races; re-torque all fasteners to specification |
| Overophedning af hus | Low oil level, wrong viscosity, overloading | Check and top up with 80W-90 oil; reduce load or allow cooling break |
| Oil seeping from seals | Degraded shaft seals, cracked housing, overfill | Replace lip seals; check oil level does not exceed 5.6 L maximum capacity |
| Reduced mixing efficiency | Incorrect PTO speed, blocked auger, worn blades | Confirm tractor PTO engages at 540 RPM; clear any blockage; inspect blade edges |
| PTO shaft disengages under load | Worn splines, incorrect shaft length, missing safety collar lock | Measure shaft length; replace worn yoke; engage locking collar securely |
Customer Success: Dairy Farm, Cheshire, UK
Whitmore Lane Dairy, Nantwich, Cheshire — 380-cow Holstein herd
In autumn 2023, the original Comer D732A gearbox on Whitmore Lane Dairy’s Trioliet Solomix 2 mixing wagon failed without warning during the start of housing season — the worst possible time for a mechanical breakdown. The farm manager, James Hartley, needed a replacement that would bolt on without any frame modification and could be sourced quickly enough to avoid disrupting the twice-daily TMR feed routine for 380 Holstein cows.
After contacting us directly, a D732A replacement gearbox was dispatched and arrived within the agreed lead time. Fitting took one afternoon with two mechanics. The unit was filled with 80W-90 oil on-farm, the PTO shaft reconnected, and the mixer returned to full operation before evening feeding. James reported that the replacement runs noticeably quieter than the original Comer unit did in its final months of service, and no oil seepage has been observed after six months of continuous winter housing use.
“We were back up and running faster than we expected. The gearbox has performed faultlessly through the entire housing period — I wouldn’t hesitate to order again.” — James Hartley, Farm Manager
“Ordered as a direct replacement for our Kuhn mixing wagon in Lincolnshire. Dimensions matched perfectly, oil change interval fits our seasonal schedule, and it has handled our 500-head sheep enterprise without a single issue.”
— Robert T., Sheep Farmer, Lincolnshire, UK
“We run contract feed mixing across several farms in Devon and needed a reliable spare gearbox on the truck at all times. This unit is priced well, built to a high standard, and the technical support from the sales team was genuinely helpful.”
— Mark D., Agricultural Contractor, Devon, UK
“Running a 200-cow beef enterprise in Herefordshire. Had the original Comer unit for 7 years before it gave out. This replacement arrived quickly, fitted without drama, and has been running for over 400 hours. No leaks, no noise. Highly recommended.”
— Ian S., Beef Farmer, Herefordshire, UK
Manufacturing & Custom Gearbox Engineering
Our manufacturing facility specialises in the production of agricultural gearboxes for global markets, with the United Kingdom representing one of our most active supply regions. We hold stock of standard configurations including the D732A replacement, and our in-house engineering team is fully equipped to develop custom gearbox solutions where off-the-shelf units do not meet your exact requirements. Shaft rotation direction, gear ratio, input and output shaft dimensions, mounting flange geometry, housing configuration, and environmental sealing specifications are all parameters that can be modified to suit your application.
We supply direct replacements for Comer Industries, Bondioli & Pavesi, Brevini, Kuhn, Storti, Trioliet, Jaylor, and Schuler gearboxes, and can also manufacture entirely new designs from technical drawings or sample units. Our quality control process covers raw material certification, machining tolerances, gear hobbing accuracy, housing pressure-testing, and final assembly inspection before despatch to UK customers.
Ofte stillede spørgsmål
What is the price of a Comer D732A replacement feed mixer gearbox for a UK dairy farm, and how do I get a quote?
Pricing for the horizontal feed mixer gearbox D732A varies depending on order quantity, shipping destination within the UK, and any customisation requirements. The most efficient way to get an accurate cost is to contact us directly at [email protected] with your mixing wagon make and model, current PTO shaft configuration, and the annual operating hours expected. We typically respond to UK enquiries within one working day.
How do I know if the D732A gearbox is compatible with my existing Trioliet or Kuhn mixing wagon in the UK?
The D732A replacement is designed to match the mounting dimensions and shaft configurations of the original Comer D732A unit. If your mixing wagon originally used a Comer D732A, the replacement should fit directly. To confirm compatibility, check the input shaft spline count (should be 6-spline, 1-3/8 inch) and the output shaft outside diameter (60 mm). If you are uncertain, share the wagon’s serial number or a photograph of the existing gearbox mounting, and our technical team will advise.
Where can UK sheep and beef farmers buy a horizontal feed mixer gearbox that is a direct Comer replacement and ships quickly?
UK livestock farmers can purchase our D732A replacement gearbox directly through this website or by emailing [email protected]. We maintain stock for prompt dispatch and can work with your preferred freight forwarder or UK agricultural parts distributor to ensure delivery is aligned with your operational timeline.
What type of oil should I use in a horizontal feed mixer gearbox D732A, and how often should I change it on a busy UK farm?
The specified oil grade is SAE 80W-90 gear oil, with a maximum fill capacity of 5.6 litres. The gearbox is supplied dry and must be filled before first use. Carry out the initial oil change after 50–70 operating hours to flush any manufacturing residues. After that, change the oil every 500–700 operating hours or at least once per year — whichever comes first. For UK farms with extended housing seasons running above 800 hours annually, a twice-yearly change is advisable.
Can I get a custom-ratio feed mixer gearbox to replace a non-standard unit on an older UK mixing wagon?
Yes. Our engineering team can modify gear ratios, shaft dimensions, housing mounting patterns, and rotation direction to suit non-standard applications. This service is particularly useful for older UK mixing wagons where the original gearbox manufacturer no longer produces a direct replacement. Contact us with your technical drawings or the specifications of the failed unit and we will assess feasibility and provide a quotation.
Which PTO shaft spline configuration do I need when connecting a D732A feed mixer gearbox to a modern UK tractor?
The D732A input connection is a 6-spline, 1-3/8 inch configuration — the most common standard on UK agricultural tractors operating at 540 RPM PTO speed. Verify that your tractor’s PTO output matches this spline count and shaft diameter before ordering a new driveline. If your tractor has a 1000 RPM output or a different spline count, discuss this with our technical team before installation to avoid mismatched shaft engagement.
Ready to Order or Need Technical Guidance?
Our team of agricultural gearbox engineers is on hand to assist UK customers with product selection, compatibility checks, and custom fabrication enquiries. No query is too technical.
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