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!

Tuff Torq K46 The Most Popular Integrated Hydrostatic Transaxle in the World

 

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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  • 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…

    • ggraham says:

      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.

  • 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)?

    • ggraham says:

      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?

    • ggraham says:

      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?

  • 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?

    • ggraham says:

      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?

    • ggraham says:

      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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