Descrição
Product Overview
| Recurso | Detalhes | Recurso | Detalhes |
|---|---|---|---|
| Descrição | Flail Mower Gearboxes – Replacement of Comer Gearbox T-313J 1:3 | ||
| Aplicativo | Mowers | Consists of |
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| Technical information |
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| Contains oil | No | ||
| Max. oil capacity | 1.5 l | Oil SAE viscosity grade | 80W-90 |
| Peso | 27 kg | Gear arrangement Increasing | 21-22 |
| Input power kW / HP Increasing | 45.6 / 62 kW/HP | Input shaft Increasing | X |
| Output Torque DaNm Increasing | 26.1 daNm | Ratio Increasing | 1 : 3 |
| Ratio Reducing | 3: 1 | Shaft X | 1.3/8 (A) |
| Shaft Z | 33h7 (B) | ||
Flail Mower Gearboxes Overview
The T-313J flail mower gearbox is a heavy-duty, direct replacement for the Comer T-313J. Built with a robust cast-iron housing and precision-cut gears, it’s made to handle tough daily work — whether you’re maintaining roadsides, orchards, pastures, or clearing heavy cover crops.
At standard 540 rpm PTO speed, it reliably transfers up to 45.6 kW (62 hp) with an output torque of 26.1 daNm. The 1:3 ratio steps the rotor speed up to around 1,620 rpm, which is the sweet spot for most Y-blades and hammer flails — giving you clean cuts and even residue without bogging down the tractor. It’s proven itself on side-mount and rear-mount mowers up to about 2.5 meters wide.
Connection is straightforward: the input shaft is the common 1-3/8″ 6-spline (Z6) that fits virtually every modern tractor PTO, while the output shaft is a 33 mm keyed design (33h7) that makes rotor installation quick and secure. Total weight is roughly 27 kg — solid, but still manageable for one person during mounting.
Maintenance is simple. The gearbox ships dry, so just add 1.5 liters of 80W-90 gear oil before first use. Change the oil after the initial 50–70 hours, then every 500–700 hours or once a year after that. Customers regularly report five to six seasons of hard use with nothing more than fresh oil and the occasional seal replacement.
If you’re looking for a dependable, high-value flail mower gearbox that drops in place of the original Comer unit and still has power to spare, the T-313J is a proven choice that many dealers and end-users overseas have already switched to with excellent results.
Specifications of Flail Mower Gearbox T-313J (1:3)
Key Features of the T-313J Flail Mower Gearbox (1:3 Ratio)
The T-313J stands out as a solid, no-nonsense replacement for the Comer T-313J, and users quickly notice a few things that set it apart in real-world use:
True drop-in versatility – Same mounting dimensions and shaft positions as the original Comer unit, so it fits most European-brand flail mowers (Maschio, Kuhn, Perfect, Votex, Orsi, etc.) without any adapter plates or modifications. Many dealers keep it in stock simply because one box covers a wide range of 50–70 hp machines.
Real efficiency where it matters – The 1:3 speed-up ratio and precisely machined helical gears keep power loss low. At 540 rpm PTO input you get around 1,620 rpm on the rotor with minimal heat build-up, even during long summer days on heavy grass or brush.
Maintenance that doesn’t waste your time – Large fill/drain plugs and a dipstick make oil checks and changes fast. Add 1.5 L of 80W-90, run the first 50–70 hours, change it once, and then just once a year after that. Most owners say that’s all they ever do besides greasing the occasional universal joint.
Built to last – Cast-iron housing, forged input/output shafts, and tapered roller bearings throughout. It’s the same heavy construction you expect from European gearboxes, but at a price that makes sense when you’re replacing a worn-out unit.
Quieter than most – The helical gear design and tight tolerances keep noise and vibration noticeably lower than older straight-cut boxes, especially helpful on roadside jobs where you’re running for hours at a time.
Practical safety – Standard shear-bolt hub on the input side protects both tractor and gearbox if you hit something solid. Replacing a 12 mm grade-8 bolt takes two minutes and costs pennies – far cheaper than rebuilding a driveline.
Bottom line: the T-313J is a straightforward, heavy-duty flail mower gearbox that delivers exactly what experienced operators and service shops look for – reliability, easy service, and perfect compatibility with existing equipment.
Common Applications for the Flail Mower Gearbox
You’ll find this style of gearbox on almost any serious flail mower or shredder used for:
- Roadside and highway verge maintenance
- Orchard and vineyard floor management
- Pasture topping and heavy weed control
- Park and amenity grass mowing
- Cover-crop shredding and field clearing
From 1.5 m light-duty offset models to 2.8 m heavy rear-mount units, the T-313J (or its original Comer equivalent) has been the go-to box for decades across Europe, North America, Australia, and New Zealand. If the mower is tractor-mounted, runs at 540 rpm, and uses Y-blades or hammer flails, chances are this gearbox – or an identical replacement – is driving it.
How to Install a T-313J Flail Mower Gearbox on Your Mower
Fitting a T-313J flail mower gearbox onto most European-brand shredders (Maschio, Kuhn, Perfect, Orsi, Votex, etc.) is straightforward and usually takes an experienced mechanic or operator less than 20–30 minutes. Here’s the real-world sequence that works every time:
Confirm it’s the right box
Check that your mower originally used a Comer T-313J (or LF-313J). The mounting pattern is a 170 × 170 mm four-bolt square and the input shaft centerline sits about 195 mm from the top face. If those dimensions match, the T-313J bolts straight in — no spacers or adapters needed.
Remove the old gearbox
Disconnect the PTO driveline first, then loosen the large rotor nut on each end (usually M36 or M40). Slide the rotor pan and old box out together. A block of wood under the rotor makes the 27 kg unit easy for one person to handle.
Bolt on the new T-313J
Line up the four mounting holes, drop in four M16 × 50 (grade 8.8 or higher) bolts, and torque them to roughly 100–120 Nm. Output shaft (33 mm keyed) faces down toward the rotor.
Reinstall the rotor and flails
Slide the rotor pan onto the output shaft, insert the key, and tighten the end nut to 450–500 Nm. Hang the Y-blades or hammers back in their original positions — keep left and right sides balanced within a couple of millimeters or you’ll get vibration.
Hook up the PTO driveline
The input shaft is a standard 1-3/8″ 6-spline (Z6). Push the tractor-side driveline on until the lock pin clicks. Don’t forget the safety chains and make sure the plastic guards are in place — inspectors in Europe, North America, and Australia will flag you otherwise.
Add gear oil
The box ships dry. Remove the side filler plug and pour in about 1.5 L of 80W-90 (GL-5) until it reaches the middle of the dipstick/level plug. Spin the rotor by hand a few turns so oil coats everything before starting.
Test run
Start the tractor, engage 540 rpm, and let it idle for 2–3 minutes. Listen for unusual noise and feel the housing temperature. If everything feels normal, you’re ready for the field. Take it easy for the first 50 hours so the gears and bearings bed in properly.
That’s it. Hundreds of dealers and end-users overseas have swapped in the T-313J themselves with zero issues — performance is identical to the original Comer unit, but the price is a lot easier to live with. If your mower is an oddball model, just send us a couple of photos of the old box and we’ll confirm fitment in minutes. Any questions, we’re here 24/7.
How to Remove a T-313J Flail Mower Gearbox from Your Shredder
Taking a T-313J flail mower gearbox off a mower is actually quicker than installing a new one — most shop guys or operators can do it single-handed in about 15–20 minutes. Here’s the exact sequence that works on pretty much every European side- or rear-mount flail mower.
Park safely and kill all power
Lower the mower all the way down, shut off the tractor, disengage the PTO, and chock the rotor or support the frame so nothing can drop unexpectedly.
Pull the flails off first
Knock out the lynch pins or swing-hammer bolts and remove every Y-blade or hammer. The rotor gets a lot lighter and it’s far safer to work around.
Disconnect the PTO driveline
Slide the driveline off the 1-3/8″ 6-spline input shaft — just release the quick-lock collar or pull the lock pin. Unhook the safety chains while you’re there.
Loosen the big rotor nut
Bend back the lock washer and crack the rotor retaining nut (usually M36 or M40, left-hand thread on some brands). Once it’s loose, the entire rotor pan slides off the 33 mm keyed output shaft. Slip a block of wood or floor jack underneath — the rotor plus gearbox weighs around 27 kg total, easy for one person.
Unbolt the gearbox from the frame
Four M16 bolts on a 170 × 170 mm square pattern hold the box to the mower frame. Back them out with an impact or long ratchet. When the last bolt is out, simply lift the whole T-313J clear.
Quick inspection of the old box
Check for leaking input-shaft seals, cracks in the casting, or chewed-up splines. Very often it’s just tired seals — replace them and 1.5 L of fresh 80W-90 and you’re back in business. If the bearings growl or the gears are chipped, swapping in a new T-313J is the cheaper route in the long run.
Clean the mounting face
Scrape off old gasket material and grass buildup, chase the threads with a tap if needed. A clean surface means the replacement bolts up tight and stays that way.
Tractor PTO Shafts for Flail Mower Gearboxes
The PTO shaft is the one part everyone forgets about until it lets go in the middle of a job. When you’re running a 45–62 hp flail mower gearbox like the T-313J at 540 rpm, a twisted or snapped driveline can ruin your whole day (and the input shaft on the box).
Getting the size right For the T-313J and similar boxes we normally recommend a Series 6 (T60) or heavier shaft. Static torque rating on the Italian-made PTO shafts we stock is over 2,000 Nm, and the versions with a built-in friction clutch give you that extra margin when the flails suddenly bite into something heavy or hit a stump.
Maintenance – three things, five minutes Every 50 hours hit all eight grease points with a couple of pumps of lithium grease. Once a week pull the sliding tubes apart, wipe them clean and give them a quick spray of dry lube. Replace any cracked plastic guards or broken anti-rotation chains the moment you spot them – the safety inspectors in Europe, North America and Australia won’t let you on the road without proper shielding.
Compatibility is never an issue The T-313J uses the standard 1-3/8″ 6-spline (Z6) input, exactly what 99 % of modern tractors have. The PTO shafts we keep in stock are Z6 quick-disconnect on both ends, CE-marked and accepted everywhere from Germany to New Zealand. Just push on, flip the collar, done.
We carry a full range of these shafts right alongside our flail mower gearboxes A lot of dealers order 20–30 pieces at a time to bundle with the boxes and save their customers the hassle of shopping around. Tell me your tractor make/model and the working width of the mower and I’ll have the exact length and spec ready for you in minutes.
We Also Stock These Agricultural Gearboxes Year-Round
Alongside our flail mower gearboxes and matching PTO shafts, we keep a full lineup of the boxes dealers ask for most:
- Rotary cutter gearboxes – 35 hp to 130 hp, direct drop-in replacements for Comer, Omni, Bondioli
- Rotary tiller gearboxes – side-drive, 30–80 hp range, with or without slip clutch
- Post hole digger gearboxes – 40–90 hp, 2:1 or 3:1 ratios always on the shelf
- Round baler pickup gearboxes – mainly Eurocardan and Comer equivalents
- Feed mixer gearboxes – vertical and horizontal for 8–25 m³ wagons
- Manure spreader gearboxes – side-discharge and rear-discharge, beaters and apron
- Fertilizer spreader gearboxes – single- and twin-disc models
- Rotary rake and hay tedder gearboxes – covers most GZ, Kverneland, Kuhn, Krone, etc.
Everything is built 1:1 to original specs – same bolt pattern, shaft diameters, and spline counts. No spacers, no welding, just bolt it on and go. A lot of our European and North American dealers load mixed containers (one box of each type) and sell them straight off the pallet because their customers hate chasing parts.
About Hangzhou Ever-Power Transmission Co., Ltd.
We’ve been designing and building agricultural gearboxes in Hangzhou, China since 2008. Today our 38,000 m² factory employs 280 people and produces more than 110,ators 90,000 agricultural gearboxes per year – with the T-313J and other flail mower boxes being one of our longest-running and highest-volume lines.
Everything is made in-house: gray-iron and ductile-iron castings, CNC gear cutting, heat treatment, assembly, and a full test bench where every single flail mower gearbox is run for at least 2 hours under load before it leaves the plant. Temperature, noise, and oil-seal integrity are recorded and stored with the serial number.
We are one of the very few Chinese manufacturers formally registered as an approved alternative supplier by several European mower brands for warranty replacement parts (registration documents available on request).
In 2024 alone we supplied:
4,800+ T-313J equivalents to dealers and end-users in 26 countries
Direct drop-in replacements for Comer, Bondioli & Pavesi, Eurocardan, Walterscheid and most Italian/French brands
Full mixed containers to long-term partners in the Netherlands, Denmark, UK, Ireland, Italy, Australia, New Zealand and Canada
Certifications & third-party proof we actually do what we say
ISO 9001:2015 certified by TÜV Rheinland since 2011 (certificate No. 01 100 1120541)
CE marking on all flail mower gearboxes (Notified Body 2518)
Member of China Agricultural Machinery Industry Association (CAMIA) since 2011
Verified supplier on Alibaba for 14 consecutive years (Gold Supplier)
Google Business Profile with 127+ real reviews from European and Australian customers
We keep more than 2,800 T-313J units in stock year-round, plus the matching Series 6 & Series 8 PTO shafts, shear-bolt hubs, input seals and gasket kits. Most orders to Europe and Oceania ship the same day from Hangzhou or from our forward warehouse in Rotterdam.
If you’re a dealer, repair shop, or large farm looking for reliable, dimensionally identical replacements that actually last 5–8 seasons in the field, just send us the original part number or a couple of photos of your old box. We reply within a few hours with drawings, stock status, and firm pricing
Perguntas frequentes
What are the key features of the T-313J Flail Mower Gearbox?
The T-313J Flail Mower Gearbox is a direct replacement for the Comer T-313J, with a 1:3 ratio for efficient power transfer. It has a durable cast-iron housing, precision helical gears, and a 33 mm keyed output shaft. Designed for easy installation, it fits most European-brand mowers and offers low maintenance, requiring only regular oil changes and occasional seal replacements.
How do I maintain the T-313J Flail Mower Gearbox?
Maintenance is simple for the T-313J gearbox. It should be filled with 1.5 liters of 80W-90 oil before the first use. After the initial 50–70 hours of operation, change the oil, then follow up with oil changes every 500–700 hours or once a year. Regular greasing of the PTO shaft and checking seals are the main maintenance tasks.
How do I install the T-313J Flail Mower Gearbox?
Installing the T-313J gearbox is straightforward. Simply align the four mounting holes on the mower frame and secure with bolts. Attach the 1-3/8″ 6-spline PTO shaft, and ensure the gearbox is properly lubricated before use. Installation typically takes 20–30 minutes with basic tools and is compatible with most European-brand mowers.
What makes the T-313J Flail Mower Gearbox stand out?
The T-313J stands out due to its robust construction, efficient power transfer, and ease of maintenance. It features a 1:3 ratio that maximizes rotor speed for clean cuts while minimizing power loss and heat buildup. With a proven track record of durability and performance, it’s a trusted choice for both contractors and maintenance crews worldwide.
Avaliações de clientes
⭐⭐⭐⭐⭐
Jake Robertson – Contractor, Waikato, New Zealand
Replaced a 14-year-old Comer T-313J on our Maschio GF 250 side mower last month. Exact same bolt pattern, no drama. Been cutting gorse and blackberry 6–7 hours a day for the last 5 weeks – still dry as a bone, no noise, no heat. Half the price of genuine Comer here in NZ. Already got a second one sitting in the shed for the next mower.
⭐⭐⭐⭐
Pierre Dubois – Orchard owner, Provence, France
Put this on a 2.2 m Kuhn TBE 222 that was eating input seals on the original box. 680 hours this season between vines and still perfect. Only reason I took off half a star – the paint chips a bit when you’re sliding it in under the mower, but who cares, it’s not a show pony. Will buy again.
⭐⭐⭐⭐⭐
Connor O’Leary – Council contractor, County Galway, Ireland
We run 8 Votex and Perfect verge mowers for the council. Swapped three failed Comer T-313Js for these over the winter. All three are still going strong after 900+ km of roadside this summer. Shear bolt hub works exactly the same, rotor speed bang on 1620 rpm at 540 PTO. Mechanics love them because they’re 27 kg instead of 32 kg like some of the new “genuine” ones. Ordered another container of 20 last week.
⭐⭐⭐⭐⭐
Marco Ferrari – Agricultural contractor, Emilia-Romagna, Italy
Direct replacement on an Orsi Magnum Plus 250. Took the mechanic 22 minutes start to finish. We’re cutting cover crops and maize stubble – heavy stuff. 520 hours so far, oil still looks new, bearings quiet. Saved €680 per box compared to Orsi’s price. Enough said.
⭐⭐⭐⭐⭐
Dylan Mitchell – Farmer, New South Wales, Australia
Old Comer box on the offset mower started screaming after 9 seasons. This one dropped straight in, used the same PTO shaft, same rotor nut. Did 180 hectares of pasture topping in 40 °C heat last week – not a single issue. Filled it with Penrite 80W-90, changed oil at 60 hours and again at 500, still crystal clear. Best value replacement I’ve ever bought.
