Is this an original Comer C3A gearbox?

No. It is a Raydafon-manufactured replacement unit built to the C3A mounting pattern, with the same 1-3/4 inch Z20 splined input and output connections, the same 540 r/min design point and the same housing footprint. Comer and C3A are trademarks of Comer Industries S.p.A., and Raydafon is an independent manufacturer that is not affiliated with, authorised by or an original equipment supplier to Comer Industries.

How do I check whether the C3A replacement gearbox fits my feed mixer?

Confirm three things against the dimension drawing: the spline size (1-3/4 inch with 20 splines on input and output), the ratio required for your auger speed (1:1 or 1.8:1 on this pattern), and the mounting dimensions and bolt-hole spacing on the gearbox plate. If your machine differs, send a photo of the old gearbox nameplate and Raydafon will confirm compatibility before you order.

Does the feed mixer gearbox come filled with oil?

No. The gearbox is delivered without oil and must be filled with SAE 90 gear oil before first use. Oil should be ordered separately with the unit so that commissioning is not delayed. The first oil change is due after 50-70 operating hours, then every 500-700 operating hours or at least once a year.

What input power and speed does this replacement gearbox accept?

This C3A pattern unit is rated for a maximum input speed of 540 r/min and up to 92 kW maximum input power. If the tractor PTO or drive motor runs at a different speed, contact Raydafon before ordering so the permitted power at that speed can be confirmed.

Which mixing wagon brands is this replacement gearbox compatible with?

The C3A mounting pattern is used on mixing wagons from a number of builders, and this replacement unit is commonly fitted to machines from Aksa, DAF Agro, Falke Maschinenbau, Euromilk and Metal-Fach. Brand names indicate mounting compatibility only; for unlisted machines, a photo of the existing gearbox and nameplate is usually enough to confirm fitment.

How quickly can the gearbox ship and can spare parts be supplied later?

Standard units ship on a short production schedule after the drawing is confirmed, by air or sea freight as required. Replacement seals, bearings and gear sets remain available from the same factory, so a later repair does not depend on dealer-only parts. Raydafon replies with price and lead time within 24 hours of the inquiry.

Comer Replacement Feed Mixer Gearbox

A Raydafon-manufactured replacement for the C3A feed mixer gearbox used on mixing wagons and TMR feeders. Rated for a 540 rpm input and up to 92 kW input power, with 1-3/4 inch Z20 splined input and output connections on the standard C3A mounting pattern. The housing is cast iron; gears are carburized and quenched to HRC55 or above for wear and impact resistance, and imported high-speed bearings carry the mixing load in continuous daily duty. Ratios of 1:1 and 1.8:1 are available for this pattern. Compatible with mixing wagons from Aksa, DAF Agro, Falke Maschinenbau, Euromilk and Metal-Fach. Comer and C3A are trademarks of Comer Industries; Raydafon is an independent manufacturer and is not affiliated with them. Send your ratio and a photo of the old nameplate for a fitment confirmation and quotation within 24 hours.

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Product Description

Comer Replacement Feed Mixer Gearbox — C3A Mounting Pattern

An independent aftermarket replacement for the C3A feed mixer gearbox used on mixing wagons. Cast-iron housing, carburized and quenched gearing at HRC55 or above, 1-3/4" Z20 splined input and output, 540 rpm rated input and up to 92 kW input power — a drop-in answer when the original unit is worn out or out of stock.

540RATED INPUT rpm

92 kWMAX INPUT POWER

Z201-3/4" SPLINE, BOTH ENDS

HRC55+TOOTH SURFACE HARDNESS

Request Price & Availability See Dimensions

Brand notice: Raydafon is an independent gearbox manufacturer. Comer and C3A are trademarks of Comer Industries S.p.A. This page describes a Raydafon-manufactured replacement unit that is dimensionally and functionally interchangeable with the C3A mounting pattern. Raydafon is not affiliated with, authorised by, or an original equipment supplier to Comer Industries. Always confirm the mounting drawing before ordering.

Comer Replacement Feed Mixer Gearbox — Compatible C3A Replacement Unit

When a mixing wagon gearbox fails, the practical question is never "which brand is on the casting" but "will it bolt up, take the load, and get here this season". This C3A-pattern gearbox is built to answer exactly that: the same splined input and output arrangement, the same 540 rpm design point, and a cast-iron housing that mounts on the wagon's gearbox plate without modifying the machine. It suits TMR mixers and feed wagons that were originally fitted with the C3A unit, and it is supplied by Raydafon from its own factory in Ningbo, China, under an ISO 9001 quality system.

Because it is a stock-production replacement rather than a dealer-only original part, lead time and unit price are both shorter and lower — which matters when a mixer is down during the feeding season. The unit ships dry and must be filled with SAE 90 gear oil before first use, so make sure oil is ordered with the gearbox. If you need the drive line as well, our PTO shaft for feed mixers is matched to the same spline profile.

Technical Specifications

ModelC3A
ApplicationMixing wagon / feed mixer
Max. input rotation speed540 r/min
Max. input power92 kW
Connection 1Splined, 1-3/4 inch, 20 splines
Connection 2Splined, 1-3/4 inch, 20 splines
Housing materialCast iron
Gear treatmentCarburized and quenched, HRC55 or above
BearingsImported high-speed bearing sets
Oil SAE viscosity grade90
Oil supplied with unitNo — oil ordered separately
Unit of saleEach

Full specification sheet for this replacement unit. Scroll sideways on a phone to see every row value.

Product name	Feed Mixer Gearboxes — Replacement of Comer C3A, 1:1, 1.8:1
Model	C3A
Unit	Each
Application range	Mixing wagon
Max. input rotation speed	540 r/min — contact us for power at a different RPM
Max. input power	92 kW
Connection 1	Splined, outside diameter 1-3/4 inch, 20 splines
Connection 2	Splined, outside diameter 1-3/4 inch, 20 splines
Housing material	Cast iron
Gear treatment	Carburized and quenched, tooth surface hardness HRC55 or above
Oil SAE viscosity grade	90
Contains oil	No — the gearbox is delivered without oil and must be filled before first use
Oil change schedule	First change after 50–70 operating hours, then every 500–700 operating hours or at least once a year
Consists of	Gearbox (order oil separately)
Compatible machine brands	Aksa, DAF Agro, Falke Maschinenbau, Euromilk, Metal-Fach

Before you order: confirm the gearbox mounting face, the input and output spline (1-3/4" Z20 on the standard C3A pattern), and the required ratio. If your mixer runs a different ratio or shaft arrangement, send the old nameplate photo or the drawing and we will match it.

Product Dimensions

The outline below is the reference geometry for the C3A replacement unit. Use it to check bolt-hole spacing, shaft centres, input and output positions and overall height against the gearbox plate on your mixer before ordering.

Comer replacement feed mixer gearbox C3A outline and mounting dimension drawing — C3A-pattern replacement gearbox — outline and mounting dimensions.

Dimensions are shown for reference. Please confirm the final drawing against your machine before placing an order — a 5 mm difference in bolt spacing is the most common cause of a return.

Which Mixers and Brands This Gearbox Fits

The C3A pattern is used on mixing wagons from a number of European and international builders. This replacement unit is commonly fitted to machines from:

Aksa
DAF Agro
Falke Maschinenbau
Euromilk
Metal-Fach

Brand names are listed only to indicate mounting compatibility. If your wagon is not listed, send a photo of the existing gearbox and its nameplate — in most cases we can confirm compatibility from the spline size, ratio and bolt pattern alone.

Product Application: How the Gearbox Works on a Mixing Wagon

On a feed mixer the gearbox is the interface between the tractor PTO and the mixing auger. Tractor power arrives at 540 rpm, the gear set reduces it and multiplies torque, and the auger turns slowly enough to lift, fold and blend hay, grain, silage and wet by-products into a consistent ration. The ratio fitted to the C3A pattern — typically 1:1 or 1.8:1 in this application — is what sets the balance between mixing speed and turning force, which is why the correct ratio matters as much as the bolt pattern.

Two operating characteristics decide whether a mixer gearbox survives a season. The first is how it copes with wet, dense material: silage and beet pulp place a much higher continuous load on the gear teeth than dry hay, so tooth-surface hardness and bearing quality are what prevent pitting and premature failure. The second is how it behaves at start-up, when a full auger has to break free of compacted feed. A gearbox with properly matched backlash and a rigid cast housing absorbs that shock far better than a light housing that flexes under load.

This is also why the practical running cost of a feed mixer is dominated by the gearbox rather than by the tractor. A unit that transmits power with minimal loss needs less fuel or electricity for the same ration, and one that holds its settings needs fewer oil changes, fewer seal replacements and less downtime in the middle of a feeding cycle. For a farm running several wagons, those numbers add up over a season.

Comer replacement feed mixer gearbox installed as the auger drive on a mixing wagon — The replacement gearbox in its working position as the auger drive on a mixing wagon.

Product Advantages

Built to run all day

A cast-iron housing and carburized gears rated HRC55 or above hold their geometry through continuous 8-hour mixing of high-fibre forage and wet grain, including the dust and humidity of daily farm use.

Efficient power transfer

Tightly matched gear engagement keeps transmission losses low, so the same tractor can mix several tonnes in a shorter cycle and burn less fuel or draw less electricity for the same ration.

Fits a wide range of wagons

The C3A mounting pattern and 1-3/4" Z20 splines cover mixers from small family machines to large TMR wagons, and the unit can replace the original gearbox without modifying the machine frame.

Straightforward servicing

The layout is deliberately simple: seals, bearings and gear sets are individually replaceable, so a workshop can complete most repairs without special tooling and get the wagon back to work the same day.

Competitive factory-direct price

Produced in our own factory rather than bought in through a distribution chain, the unit is priced below dealer-only original parts, with the same spline, ratio and mounting dimensions.

Spares and technical support

Oil specification, ratios, replacement seals and bearings are all available from the same supplier, with engineers available to confirm fitment from a photo of the failed unit.

Performance depends on correct oil grade, correct oil level and the operating hours stated in the maintenance schedule — the oil change intervals for this unit are not optional, and skipping the first change at 50–70 hours is the most common cause of early bearing noise.

Ordering, Delivery and Maintenance

Send the details.Tell us the model or ratio (C3A, 1:1 or 1.8:1), the quantity, and — if you have it — a photo of the old gearbox nameplate and its mounting face.
Confirm the drawing.We check the spline, ratio and mounting pattern against the C3A reference drawing and send a confirmation before production, so nothing is built against a wrong assumption.
Firm quotation and lead time.You receive price, quantity breaks, packing details and delivery schedule, normally within 24 hours of the inquiry.
Shipping.The gearbox is packed for export and shipped dry. Air or sea freight, and door-to-door delivery, can be arranged on request.
Commissioning.Fill with SAE 90 oil before first use, check the oil level at the sight plug, and run the mixer unloaded briefly to confirm smooth rotation and no seal weeping.
Maintenance schedule.First oil change after 50–70 operating hours, then every 500–700 operating hours or at least once a year — whichever comes first.

Customer Testimonials

★★★★★

Michael ThompsonFeedlot Operator

Installation was straightforward and the wagon ran smoothly from the first mix. The unit feels solid, holds its speed under load and takes the effort out of feeding. I asked a long list of questions before ordering and the team answered every one patiently, which is not always the case with an overseas supplier. I will come back when the second wagon needs one.

★★★★★

David WilsonDairy Farm Manager

The gearbox is well made and has run steadily since we fitted it, with no problems in daily use. Communication was the part I appreciated most — clear answers, no language barrier, and delivery on the date they promised. As a buyer abroad that reliability matters, and I will keep ordering from them.

★★★★★

Hannah MooreRanch Owner, New Zealand

I have been through several batches of mixer gearboxes over the years, and wet material was always the problem — the old units would slip or overheat. This one handles silage and beet pulp without complaint, keeps a steady mixing speed, and my cycle time is close to twice as fast as before. Maintaining it has been simple.

Buyer FAQ

Is this an original Comer gearbox?No. It is a Raydafon-manufactured replacement unit built to the C3A mounting pattern: same 1-3/4" Z20 splined connections, same 540 rpm design point and the same housing footprint. Comer and C3A are trademarks of Comer Industries; Raydafon is an independent manufacturer and is not affiliated with or authorised by them.
How do I know it will fit my mixer?Compare the spline (1-3/4 inch, 20 splines), the ratio (1:1 or 1.8:1 on this pattern) and the mounting dimensions in the drawing above with your existing unit. If anything differs, send us a photo of the old nameplate and we will confirm before you order.
Does the gearbox come with oil?No. It is delivered dry and must be filled with SAE 90 gear oil before first use. Order oil separately with the gearbox so commissioning is not delayed.
What is the oil change interval?First change after 50–70 operating hours to clear the initial wear particles, then every 500–700 operating hours or at least once a year, whichever comes first.
What input power and speed can it take?The unit is rated for a maximum input speed of 540 r/min and up to 92 kW maximum input power. If your tractor or motor runs at a different RPM, contact us before ordering so we can confirm the power rating at your speed.
How fast can you ship, and can I get spare parts later?Standard units ship on a short schedule after drawing confirmation, with air or sea freight options. Replacement seals, bearings and gear sets are available from the same factory, so a repair later does not depend on finding dealer-only parts.