Question: Can I buy service parts for Tuff Torq transaxles?

Answer: Yes, depending on the serial number, there should be service parts and complete replacement units available.

Question: The part number or image is not located on the exploded diagram. Is this not available through Tuff Torq?

Answer: This usually means that either it is no longer available, or it was an item that was supplied by the vehicle manufacturer. Double-check the TTC drawing.

Question: My barcode label is gone so what model do I have?

Answer: Check under the seat in case it is a model that had duplicate barcode stickers. If not found, please refer back to the Tractor Manufacturer for more product information or the owner’s manual. The serial number is key information for all rebuilds and especially for filing warranty claims.

Question: Can I use a different model to replace my broken transmission? For example, I want to buy a K46BT to replace my K46AC.

Answer: No, you must rebuild or replace the damaged transaxle with the same model transaxle. The units are not interchangeable.

Question: Should I use Synthetic Oil when rebuilding my Tuff Torq Transaxle?

Answer: In most instances, the answer is yes, but to make certain of this, we suggest that you view our oil fluid chart. Tuff Torq branded 5W-50 FULL Synthetic Oil is recommended.


Question: How much oil does the unit hold?

Answer: Please refer to the Fluid & Lubricant chart for unit oil volume.


Question: My mower slows down after it warms up. What is wrong?

Answer: Make sure all external connections are in place and functioning properly; this also includes the drive pulley, belt, and the engine rpms. Make sure the wheel hub keys are installed and double-check all external parts. If all is OK, then you should inspect the oil inside the trans. If the unit is low, then add oil. If this doesn’t solve the problem, then it must be rebuilt with a repair kit or replaced with a new transaxle.

Question: After repairing the transaxle, the customer’s forward is reverse and reverse is forward. (In other words the trans is now running backwards)

Answer: You should rotate the Motor Housing 180° in order to fix this issue.

Question: What is the max temp on a unit before you risk the damage to internal parts?

Answer: First of all, loss of power is common when oil temperature rises above 90°C (195). As the oil temperature rises its viscosity decreases and internal leakage increases, thus efficiency decreases (unable to transmit as much power).

Question: I have oil on top of the unit, so do I have a leak?

Answer: Not necessarily, but the unit should be inspected for leaks. If no leaks are observed, then it is possible that the unit has pushed oil from the vent valve due to extreme heat. The oil level should be inspected and topped off if low.

Question: Can the fluid be changed in my K46 now that it is out of warranty? I was told it was a sealed unit?

Answer: Yes, please refer to the Oil replacement document.


Question: I don’t know if I have a K50 or a K55? Can you tell me what I have?

Answer: To determine what you have, you must inspect the axle housings. If the case halves split over the axles, then you have a K50. If the axles run through the upper housing and the lower housing is just a cover, then you have a K55.

Question: I don’t know if I have a K60 or a K61? Can you tell me what I have?

Answer: To determine what you have, you must inspect the axle housings. If the case halves split over the axles, then you have a K60. If the axles run through the upper housing and the lower housing is just a cover, then you have a K61.

Question: What type of sealant do I seal the case halves up with?

Answer: It is highly recommended that you use Tuff Torq approved sealant.

Question: Where is the serial number located?

Answer: It is located on the back portion of the transaxle on a white label. Occasionally, a duplicate label will be located under the seat on the mower.

Question: My owner’s manual says that I have a (EX. K46HD) Can you sell me parts or a new unit?

Answer: Always refer back to the Tuff Torq serial number on the transaxle. This is critical that you identify the unit based off the original trans serial number. We don’t advise that you rely only on the owner’s manual as this could be a misprint from the tractor manufacturer.

Question: What does IDS mean or stand for?

Answer: IDS stands for the Internal Dampening System. Tuff Torq developed this as an alternative to having an external shock absorber or dampener. Refer to the IDS diagram for orientation details.

Question: I can’t get the unit to free-wheel or the bypass doesn’t work.

Answer: First of all, has the unit been rebuilt? If so, was the bypass pin and washer installed? If the unit hasn’t been touched or opened, then perhaps the bypass valve, spring, pin, or washer is damaged. This would result in an internal transmission repair.

Question: What does IRH stand for?

Answer: This stands for Internal Reservoir Housing. In other words, the K46 IRH models actually have more oil capacity than the NON-IRH K46 models. This is why the NON-IRH models have external oil reservoir tanks.

Question: How often should I change my fluid?

Answer: This is model specific, but for light duty units (K46) it is typically not recommended. However, if the customer insists on changing the fluid, then it should be done at 50 hours (initial break-in period) and then every 200 hours.

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