Tuff Torq K46 ǀ The Most Popular (IHT) in the World
The Tuff Torq K46 is the most popular integrated hydrostatic transaxle (IHT) in the world…and for good reason.
This power unit has all the features and performance of much larger and more expensive transaxles, all at a very affordable cost and in a small and purpose-focused design. This transaxle has a proven track record in a vast array of applications in all kinds of conditions. We are confident that the Tuff Torq K46 is a great choice for your next riding mower or lawn tractor project
Why Choose Tuff Torq?
Many companies will immediately tell you how wonderful their products are by jumping right into discussing features and benefits, we’ll get into that below, but first… in our opinion, great products can only be made by great companies and Tuff Torq is truly a great company.
Here’s why, Tuff Torq exists to provide a secure future for our employees, benefit the community, and respect the environment…we just happen to build the highest-value off-highway powertrain solutions in the world.
Now for the features and specifications…
Features
- Patented L.O.G.I.C. case design for easy installation, reliability and serviceability.
- Internal wet disk brake system
- Reversible output/control lever operating logic for application optimization.
- Smooth operation for either foot or hand control system.
Specifications
| Specification | Value | Units |
|---|---|---|
| Application | Rear Engine Riding Mower Lawn Tractor |
|
| Reduction Ratio | 28.04:1 21.53:1 |
|
| Axle Torque (Rated) | 28.04:1 = 231.4 (171) 21.53:1 = 177.7 (131) |
Nm (ft-lb) |
| Max. Tire Diameter | 28.04:1 = 508 (20) 21.53:1 = 457 (18) |
mm (in) |
| Brake Capacity | 28.04:1 = 330 (243) 21.53:1 = 253 (187) |
Nm (ft-lb) *@ 350 N (79 lb) Brake arm force |
| Displacement (Pump/Motor) | 7/10 | cc/rev |
| Max. Input Speed | 3,400 | rpm |
| Axle Shaft Size | 19.05 (0.75) | mm (in) |
| Weight (dry) | 12.5 (27.6) | kg (lb) |
| Brake Type | Internal Wet Disc | |
| Housing (Case) | Die-Cast Aluminum | |
| Gears | Heat-treated Powder Metal | |
| Differential | Automotive-type Bevel Gears | |
| Speed Control System | Foot Control: Dampening system or external shock absorber available Hand Control: External friction pack and lever avalailable |
|
| Bypass valve (Roll Release) | Standard | |
| Hydraulic Fluid Type | Proprietary Tuff Torq Tuff Tech drive fluid recommended. (Contact OEM for other options) |
For more information, download the Tuff Torq K46 brochure here Residential-IHT-brochure-web
Whether you are a customer, distributor, dealer, or OEM we would love to hear from you. Please reach out using the form below!
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wayne gowland says: Your specs for the K46 transaxle says it has a 3/4 ” axle shaft. the XT2 LX42 Cub Cadet tractor specs says it has a K 46 transaxle with 1″ axle shaft. Which one is correct? Thank-you
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ggraham says:
Hello,
The K46 does have 3/4 inch axles.
Vincent Gonzalez says: how to determine if pistons on pump or motor are worn? specifications to measure them.
Can you rebuild or refurbish these pumps or motors? Is repair kit only option?
looking for parts for 7A64+6084180 S/N 46BT029180
Thanks
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Hello,
It is not usually the pistons that are bad. I know it is all over the internet, but you would need to look at the center case faces on which the cylinder blocks rotate. Specifically, look at the area between the kidney ports for scratches or grooves, and if you flip the cylinder block over, look at the metal between the kidney ports. If there is anything not glassy smooth on any of the parts then that is your issue. A repair kit replaces the hydraulic parts so it is the best fix.
Hello I am in New Zealand and have a mower with a K46L that is worn out. I have been unable to find a replacement but have been offered a K46CY . I have the skills to make some basic modifications to make it fit if there is some minor differences but are they smaller enough to allow that
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Hello,
A K46CY will not work. Its configuration is set to be controlled with a pedal and the K46L is configured for fender control. The K46L does not have an internal return to neutral spring but the K46CY does so it will constantly be pulling itself out of “gear” because of the return to neutral spring. We do have a Distributor in New Zealand and I will put their contact information in this response.BE Pressure Supply Ltd
8 Perclo Place
Pukete, Hamilton, 3200
64 7 849 0000
jlahman@bepressure.co.nz-
Me says:
Pedal or LEver they both move the same part and it wouldn’t make a difference.
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Hello,
Yes, the pedal or lever moves the same part, that is true. However, there are instances that I have witnessed where the pivot point for the linkage starts to get worn and it will not move the lever as far. The lever is connected to the swashplate, internally and it is the swashplate that squeezes the pistons in the pump cylinder block to produce oil pressure to drive the transaxle. Now the Transaxle has a variable speed pump because the swashplate moves and if it moves a little it squeezes the pistons only a little so only a small amount of oil pressure is built so moves the transaxle or it squeezes a lot and the pressure is much higher moving the transaxle faster. The oil pressure is determined by the swashplate, so it follows logically that if something with the linkage is making the control lever move not quite as far in one direction then the swashplate will pump less oil than it can. Now you see? It is an external issue that affects the transaxle itself that is a lot easier and cheaper to deal with than rebuilding a transaxle that may not actually need to be rebuilt. An easy check and an easy cheaper fix that has actually gotten to the issue. That is why I always give troubleshooting advice to check external things first. I want to empower owners to find the real issue.
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Hello,
K46 is a line of transaxles Tuff Torq produces. The K46E is a specific K46 that is produced for Countax.
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Hello,
I am sorry but the internal configurations are such that those two will w=not work to swap them.
Martin Caird says: I have a 6 yr old John Deere LA130 that needs a new transmission. Is the K46 the correct model and what other parts do I need to add to it?
Costs would be great too.
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Hello,
The LA130 has a K46BE installed with a part number of 7A646084121. Since you are located in Canada you would need to contact the Canadian Distributor, CPT.
Canada Power Technology
161 Watline Ave.
Mississauga, Ontario L4Z 1P2
1-800-561-0004
jharrington@canadapowertech.com
http://www.canadapowertech.com
Richard Hayes says: What is the difference between a K46 and a K46BE
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Hello,
K46 is a transmission line that Tuff Torq produces and K46BE is a specific version of the K46 line. There are no generic K46’s. All are specifically produced for a particular tractor that they are installed in.
Lester Raby says: i just bought a new K46 axle from amazon does these have the oil done in them it came in a husqvarna box New. Just needed to know?
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Hello,
Yes, it does have oil if it is a K46.
Al says: Price of jd transaxle 7A646024090. K46
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Hello,
I am sorry but I do not have a K46 with that part number. Which tractor is it in?
Ken Cullipher says: Is the K46AC similar to the K46BE? My newer mower uses the K46BE. The old mower that lost the K46AC is 16 years old. I’d be willing to buy a new K46BE to replace the bad K46AC, if it would work in the old mower, then it would be a spare transmission for the new mower, should anything happen to the old mower…
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I am sorry but the configurations are different enough to make it not work as a replacement. There are still new K46AC’s available, however.
Tom Meads says: After removing the axle seals. I found the bushing had walked out past the limit per your illustration.
I would like to know what tolerances to expect with new bushings (axle run out) so I can make a more informed decision about new bushings. I also need part no.s for inner and outer k46bt parts. Thank you for your help so far.
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Hello,
Here is the link to the transmssion>> https://tufftorq.ordertree.com/catalog/partslist/view/group_id/426790/?assembly=Parts&assembly_id=2700
BUSHING I.D. 19.13 – 19.23 mm
AXLE SHAFT O.D. 19.00 – 19.05 mm
CLEARANCE 0.08 – 0.23 mm
MAXIMUM WEAR LIMIT 0.5 mm
Tom Meads says: The bt model originally has the splash plate’s big end down. If this is true. It would take a (be) model with the splash plate inverted to operate (properly)?
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Between a K46BT and a K46BE there are even more differences. Add the axles as a difference and the original oil. They are bought by 2 different companies.
Tom Meads says: Referring to a previous post. What exactly will happen by interchanging the BE with the BD models?
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Hello,
The Logic is different so if you swap one for the other it will go in reverse when you hit the forward pedal. Also, the fan and pulley stack up, and the height are not the same so there would have to be some modifying to get it to line up correctly or the belt will come off constantly.
Tom Meads says: How much axle run out is too much. I put a dial indicator on the axle and got a (0.010) ”
movement. My axle seal is leaking.
F
Do the bushings need replacing along with the seals?
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Hello,
There can be a considerable amount of Play. Usually, you only need to change the bushing if it is starting to come out of the housing and is pressing on the seal. You will only really be able to see it if you remove the seal. Here is the link to the procedure for changing the axle seal.
https://tufftorq.ordertree.com/media/promo/TuffTorq/Axle%20Bushing%20Alignment%20Procedure%20-%20T40,%20TL-200,%20K46,%20K57%20or%20K574.pdf
Dan Kaiser says: I have a craftsman 46″ 24hp mower model ” 24420 t8200 pro series with 260 hours on it. Possibly K46 DM trans. It barely backs up but goes forward fine. Any ideas what to do?
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Hello,
You should check all the linkages and make sure they are moving the control lever in its full arc. it is then you need to check the oil level and make sure there is enough oil. if the oil is fine I would then recommend changing the oil to our Tuff Tech oil and see if it gets better.
Brandon Broyles says: will a K46BE interchange with a K46BT?
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Hello,
no those are two different transmissions, though it will bolt in the configurations internally are different enough to make the transaxle not work the same as the original transaxle
J Egge says: I purchased and installed a K46C transaxle on a John Deere in June,2017. It is slipping when I cut uphill. It was prefilled with oil. Is there anything I can adjust or a way to check the oil?
The original trans served me well for 15 years.
David Coffield says: I may need to purchase either a K46 transaxle or the repair kit from you. Can you send me the pricing information? I’m not a repair shop, so whatever your retail price is. My transaxle probably stripped when the Ariens tractor ran out of gas while driving down a steep hill. The stress was enough to bend the tractor frame. I repaired the frame and reinstalled the transaxle, but it isn’t responding (and the release for transport IS engaged). The drive belt is turning and the transaxle pulley is spinning.
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S. Haase says:
The website ” https://www.tufftorqservices.com ” has no reaction.
The link-buttons are without any function …
No Information can be reached …
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