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Simplicity Regent Tuff Torq K56A-SMP hydro transmission

#1

R

Rob O.

Does anyone know the difference in theTuff Torq K56A-SMP Hydro transaxle? Simplicity has 2 part numbers. 1717194 and 1720092. Are they interchangeable? Differences? I think my 1720092 is on it’s last leg but the 1717194 is much more popular and easier to locate. I just don’t know if it will swap out easily.


#2

R

Rivets

Post your tractor model numbers so we can cross reference to the tranny.


#3

R

Rob O.

Hi Rivets and thank you for responding. I have a Regent 15 HP Hydro model # 1693528. I bought it in 2000 and it has been a great mower. I just overhauled and reconditioned the entire machine and stuck a bit of $$$ into it. I like the fact that it’s reliable and don’t really want to replace it with one of today’s “throw away” machines. But I’m worried about the tranny........


#4

R

Rivets

Sorry, but I’m not going to be of much help. I’ve tried to find the differences between the two trannies, but keep getting roadblocks, because we’ve just got Simplicity numbers not Tuff Torq numbers. I can offer this suggestion if you have the bar code numbers off each tranny. With these numbers you can contact Tuff Torq directly with a phone call and they can help you out. I’ve found them extremely helpful and friendly when dealing with them. This website shows what you will need before calling. https://www.tufftorq.com/tuff-torq-barcodes/


#5

tom3

tom3

I looked at both units on Ebay, (used and pretty expensive even at that). Don't see any major differences and with the same Tuff Torq basic model number I'd guess they are pretty much interchangable. Maybe a different wire connector or something that you could swap from the old one. Have you ever changed the oil in your trans? There is a lot of info on the net about those Tuff Torq hydros and videos on Youtube on servicing them.


#6

Scrubcadet10

Scrubcadet10

All dependent upon the trans having a drain plug.


#7

R

Rob O.

tom3 said:
I looked at both units on Ebay, (used and pretty expensive even at that). Don't see any major differences and with the same Tuff Torq basic model number I'd guess they are pretty much interchangable. Maybe a different wire connector or something that you could swap from the old one. Have you ever changed the oil in your trans? There is a lot of info on the net about those Tuff Torq hydros and videos on Youtube on servicing them.
Click to expand...
I have never changed the oil. I’ve watched a few videos and seen some of the results that went bad. Guess I’ll give it a try. Not much to loose. I hate the thought of replacing it with a $300 used tranny that MAY or MAY NOT be good.


#8

R

Rob O.

Scrubcadet10 said:
All dependent upon the trans having a drain plug.
Click to expand...
Is that the ONLY difference? You know this for sure?


#9

R

Rivets

There is no way any of us would know for sure unless we had both units sitting in front of us. If you want to know for absolutely sure, you’ll have to do what I said early, contact Tuff Torq. Make sure you have all the numbers or they won’t be able to help you.


#10

StarTech

StarTech

No drain plug. Unit must be removed, item 8 (sealing cap) and 6 (filter) removed, and turned upside down and drain thru the hole. Also I would recommend changing the main oil filter (item 21) while the unit is upside down as there are a few captive items that will fall out otherwise when you remove the oil pan (lower case). one is item 20. Item 8 should also be replaced as they will age and crack leading to water intrusion.
Tuff K56.JPG

Also 1686788SM is the current replacement for the 1693528 mower.

1720092 (superseded to 1720092SM) is a K56A-8MP
1717194 (superseded to 1686788SM) is a K56A-SMP
1717194 was just a newer version of the K56A. Per the above IPL image all K56A are the same unit internally. It just some of the internal parts have been upgraded.

Just be aware this is a $2000+ transaxle. Comes with pulley kit but may not come with the fan.


#11

Scrubcadet10

Scrubcadet10

Rob O. said:
Is that the ONLY difference? You know this for sure?
Click to expand...
sorry, i meant to reply to Tom3, about the changing the gear oil.


#12

StarTech

StarTech

Scrubcadet10 said:
sorry, i meant to reply to Tom3, about the changing the gear oil.
Click to expand...
Scrub that why we need to quote the post we are relying to as to not confuse those that are already confused.?


#13

R

Rob O.

StarTech said:
No drain plug. Unit must be removed, item 8 (sealing cap) and 6 (filter) removed, and turned upside down and drain thru the hole. Also I would recommend changing the main oil filter (item 21) while the unit is upside down as there are a few captive items that will fall out otherwise when you remove the oil pan (lower case). one is item 20. Item 8 should also be replaced as they will age and crack leading to water intrusion.
View attachment 55093

Also 1686788SM is the current replacement for the 1693528 mower.

1720092 (superseded to 1720092SM) is a K56A-8MP
1717194 (superseded to 1686788SM) is a K56A-SMP
1717194 was just a newer version of the K56A. Per the above IPL image all K56A are the same unit internally. It just some of the internal parts have been upgraded.

Just be aware this is a $2000+ transaxle. Comes with pulley kit but may not come with the fan.
Click to expand...
Awesome and Thank You. I think that’s the info that I was looking for. So, as per your information, they are interchangeable. I always assumed they were due to the Tuff Torq K56A model number but I wasn’t sure. Much appreciate the information.


#14

B

bertsmobile1

Hydros are much like cube carbs
Most are built into the same body and are identical inside
where the difference occurs in variants is the placement of the controls , the type of fitment of the controls.
Then there is the length , thickness & retainers on the end of the input shaft.
Plus the same parameters for the axels.
Thus any hydro can be replaced with almost any other.
'However to make them work you may need to fabricate new connections between the box and the controls.
And you may need to change the axels or use the wheels that were originally fitted to the replacement hydro.

As you go up usually the only difference is the displacement of the pump & motor and in many cases a bigger one can be fitted to upgrade the box.
They have to be made like this to take advantage of economies of scale
If each box was totally different internally they would have a starting price of $ 5000 not $ 1500 .

I have done this on more than one occasion as I inherited a large number of rear engine hydros that I have been fitting into tractor style mowers


#15

R

Rob O.

bertsmobile1 said:
Hydros are much like cube carbs
Most are built into the same body and are identical inside
where the difference occurs in variants is the placement of the controls , the type of fitment of the controls.
Then there is the length , thickness & retainers on the end of the input shaft.
Plus the same parameters for the axels.
Thus any hydro can be replaced with almost any other.
'However to make them work you may need to fabricate new connections between the box and the controls.
And you may need to change the axels or use the wheels that were originally fitted to the replacement hydro.

As you go up usually the only difference is the displacement of the pump & motor and in many cases a bigger one can be fitted to upgrade the box.
They have to be made like this to take advantage of economies of scale
If each box was totally different internally they would have a starting price of $ 5000 not $ 1500 .

I have done this on more than one occasion as I inherited a large number of rear engine hydros that I have been fitting into tractor style mowers
Click to expand...
Great to know. Thank you


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