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Cub Cadet Hydrostatic oil substitute #4751594
05/08/18 09:12 PM
05/08/18 09:12 PM
Joined: Jul 2006
Posts: 613
SW Michigan, near Fennville
Nebraskan Offline OP
Nebraskan  Offline OP
Joined: Jul 2006
Posts: 613
SW Michigan, near Fennville
Got out our Cub Cadet XT1 Enduro Series and notice a oil spill under the rear of the lawn tractor (mower). Once I got it backed out I let it sit for several days and when trying to move it while running it barely moved forward and very little in reverse. Oil had leaked from the "Hydrostatic Transmission" and is sealed at the factory and not a owner serviceable (as in add oil) unit. You cannot check or change the oil and is designed for the life of the unit. Some life! Bought it June 3, 2015 and so not yet 3 years old (which might be withing it's warranty period. I took out the battery and one of the brackets and low and behold on the left side is a cap. Got the cap off and I was able to look right down into the trans-axle. Only thing I had that looked like it might be compatible for a Hyrdostatic drive was my Honda CR-V, Genuine Honda Fluid 08798-9031 Manual Transmission Fluid. Our Honda CR-V is a 5 speed stick shift 2002 light RV. So the transmission oil is not transmission 90W or anything like ATF.

I added about 1-2 cups of this Honda oil, replaced the cap and "what do you know" I was able to move it like normal again. I am scheduled to take it to the Cub Cadet service center to have this apparent leaking seal fixed. BUT was wondering if any of you have heard exactly what type of oil is in these Hydrostatic Transmission on the MTD Cub Cadet lawn mower tractors??


Cheers!
Home beer maker as well. smile
Re: Cub Cadet Hydrostatic oil substitute [Re: Nebraskan] #4751605
05/08/18 09:22 PM
05/08/18 09:22 PM
Joined: Jun 2013
Posts: 1,721
Virginia
mattwithcats Offline
mattwithcats  Offline
Joined: Jun 2013
Posts: 1,721
Virginia
Transmission is a Tuff Torq K46, I believe.

Fill from factory was 10w-30, however Tuff Torq now says use 5w-50.

5w-50 is hard to find, so most people use Mobil 1 15w-50 or NAPA 15w-50...


2009 Smart Pure
Pennzoil Platinum Euro 0W-40, Purolator Synthetic PSL 14610, 45 mpg...
185/55R15 General HP tires, "H" speed rated, 44 psi (300 kpa)
Re: Cub Cadet Hydrostatic oil substitute [Re: Nebraskan] #4751648
05/08/18 10:37 PM
05/08/18 10:37 PM
Joined: Mar 2018
Posts: 60
TX
raburn2906 Offline
raburn2906  Offline
Joined: Mar 2018
Posts: 60
TX
My manual says not owner serviceable as well, but lists 20W50 hydro fluid as the fill oil.


2008 Ford F150 XLT 4.6L
171,609 - Valvoline Synthetic Max Life - Wix XP51372
2001 Ford F150 XLT 5.4L
216,051- Valvoline Synthetic Max Life - Wix 51372
Re: Cub Cadet Hydrostatic oil substitute [Re: Nebraskan] #4751742
05/09/18 06:15 AM
05/09/18 06:15 AM
Joined: Jun 2013
Posts: 1,721
Virginia
mattwithcats Offline
mattwithcats  Offline
Joined: Jun 2013
Posts: 1,721
Virginia


2009 Smart Pure
Pennzoil Platinum Euro 0W-40, Purolator Synthetic PSL 14610, 45 mpg...
185/55R15 General HP tires, "H" speed rated, 44 psi (300 kpa)
Re: Cub Cadet Hydrostatic oil substitute [Re: Nebraskan] #4751765
05/09/18 06:59 AM
05/09/18 06:59 AM
Joined: Sep 2002
Posts: 2,317
VA
Gebo Offline
Gebo  Offline
Joined: Sep 2002
Posts: 2,317
VA
mattwithcats is right on. My older stuff's manual said to use 10w-30 but it has since changed. TT now recommends heavier weight oils for the most parts. You gotta find out which transmission you have. Then simply call TT or go online and search. I have mowers using K61 and K62 transmissions and I use Amsoil Zero Turn Hydrostatic fluid 20w-50 in both of mine. Really quieted them down. IF I remember correctly, some of the TT transmissions still call for lighter weight oils. But like I stated earlier, most moved up to thicker weight. I only use my mower to mow and it's between 50-100 degrees when being used.

I change my fluid every other year.


'98 LEX LS400 280K
'00 LEX GS300 195K
'02 4Runner 225K
'05 Lex LS430 85K
'06 Toyota Highlander 145K
'09 Lex IS350 85K
'07 Lex GX470 60K
Amsoil in all engines, transmissions and differentials

Re: Cub Cadet Hydrostatic oil substitute [Re: Nebraskan] #4751850
05/09/18 09:14 AM
05/09/18 09:14 AM
Joined: Jul 2006
Posts: 613
SW Michigan, near Fennville
Nebraskan Offline OP
Nebraskan  Offline OP
Joined: Jul 2006
Posts: 613
SW Michigan, near Fennville
I found the little plug on top and using a funnel put a little bit of this HONDA Manual Transmission oil in there. Here is the link. https://www.amazon.com/dp/B001IWL1O8/?co...lv_ov_lig_dp_it Curious how compatible this is to what was in there and leaked out.


Last edited by Nebraskan; 05/09/18 09:18 AM.

Cheers!
Home beer maker as well. smile
Re: Cub Cadet Hydrostatic oil substitute [Re: Nebraskan] #4751875
05/09/18 09:55 AM
05/09/18 09:55 AM
Joined: Aug 2003
Posts: 10,877
Buffalo, NY
JTK Offline
JTK  Offline
Joined: Aug 2003
Posts: 10,877
Buffalo, NY
I would top it off with 15w40 or 20w50 motor oil.

FWIW, I was in line behind a guy at Advance Auto the other day who had a late model Cub Cadet riding mower with an axle seal leak. It's still under warranty, but the guy didn't want to wait to have it fixed. The counter guy sold him a bottle of 75w90 gear oil. shocked


2017 Ram 1500 4x4, 3.6L. 2016 Nissan Quest SV (Babe magnet IV)
Re: Cub Cadet Hydrostatic oil substitute [Re: Nebraskan] #4751885
05/09/18 10:04 AM
05/09/18 10:04 AM
Joined: Jun 2014
Posts: 743
Northern Arizona
funflyer Online content
funflyer  Online Content
Joined: Jun 2014
Posts: 743
Northern Arizona
Originally Posted By: Nebraskan
I found the little plug on top and using a funnel put a little bit of this HONDA Manual Transmission oil in there. Here is the link. https://www.amazon.com/dp/B001IWL1O8/?co...lv_ov_lig_dp_it Curious how compatible this is to what was in there and leaked out.




It shouldn't be an issue other than lowering the oil's viscosity and causing the leak to get worse, but I would get the correct fill in there as soon as I could. I got the 5w-50 oil for my Cub from Napa, https://www.napaonline.com/en/p/MCL122075


2016 Prius 1.8L
2001 Tacoma 2.4L
1966 GTO 6.5L
2015 Cub Cadet
Honda CT70 (X6)
Re: Cub Cadet Hydrostatic oil substitute [Re: mattwithcats] #4751967
05/09/18 12:17 PM
05/09/18 12:17 PM
Joined: Apr 2010
Posts: 4,465
Storrs, Connecticut
jeepman3071 Offline
jeepman3071  Offline
Joined: Apr 2010
Posts: 4,465
Storrs, Connecticut
Originally Posted By: mattwithcats
Transmission is a Tuff Torq K46, I believe.

Fill from factory was 10w-30, however Tuff Torq now says use 5w-50.

5w-50 is hard to find, so most people use Mobil 1 15w-50 or NAPA 15w-50...


Yup, according to the Tuff Torque rep, they now recommend 5w50. I'd use a 5w50 or 15w50 and you should be set. I filled the K66 in my Deere with Castrol Edge 5w50 and it has been working pretty good since. The transmission seemed a tad bit more responsive after the change and was definitely quieter. It had a significant whine when mowing up hill before the change, and the fluid that came out was pretty nasty at 350 hours.


2000 Jeep Cherokee 4.0L (181k) - Pennzoil 10w30, Napa Gold 1516, Magnefine trans filter
2009 BMW 328i (34k) - Castrol Edge Euro 0w40, MANN HU816X
Re: Cub Cadet Hydrostatic oil substitute [Re: Nebraskan] #4752021
05/09/18 01:10 PM
05/09/18 01:10 PM
Joined: Jun 2005
Posts: 88
alabama
wayne50 Offline
wayne50  Offline
Joined: Jun 2005
Posts: 88
alabama
I have a K46 in a John Deere and and as others have said, TuffTorq now says use 5W-50 synthetic. That what I did when I changed mine. I followed the procedure I found online.

Re: Cub Cadet Hydrostatic oil substitute [Re: Nebraskan] #4752067
05/09/18 02:30 PM
05/09/18 02:30 PM
Joined: Jul 2006
Posts: 613
SW Michigan, near Fennville
Nebraskan Offline OP
Nebraskan  Offline OP
Joined: Jul 2006
Posts: 613
SW Michigan, near Fennville
This hydrostatic transmission doesn't have a drain plug on the bottom.


Cheers!
Home beer maker as well. smile
Re: Cub Cadet Hydrostatic oil substitute [Re: Nebraskan] #4752279
05/09/18 06:40 PM
05/09/18 06:40 PM
Joined: Apr 2010
Posts: 48
ms
racinjason Offline
racinjason  Offline
Joined: Apr 2010
Posts: 48
ms
Originally Posted By: Nebraskan
This hydrostatic transmission doesn't have a drain plug on the bottom.


None of the cheap mowers do. You have to take the trans out and turn it over to drain from the fill plug, OR use a mighty vac if you can get to it. Sounds like you can if you have a mighty vac.

If itís a k46 have 2 qts handy to fill it back up, clean the magnet under the full plug.

Re: Cub Cadet Hydrostatic oil substitute [Re: racinjason] #4753368
05/10/18 07:27 PM
05/10/18 07:27 PM
Joined: Jun 2014
Posts: 743
Northern Arizona
funflyer Online content
funflyer  Online Content
Joined: Jun 2014
Posts: 743
Northern Arizona
Originally Posted By: racinjason
Originally Posted By: Nebraskan
This hydrostatic transmission doesn't have a drain plug on the bottom.


None of the cheap mowers do. You have to take the trans out and turn it over to drain from the fill plug, OR use a mighty vac if you can get to it. Sounds like you can if you have a mighty vac.

If itís a k46 have 2 qts handy to fill it back up, clean the magnet under the full plug.



I only plan on taking out my Cub's trans-axle one time and that's to drill and tap the lower housing for drain plugs. I'll have about 50 hours on it by the end of this season so that's long enough for the factory fill to stay in. I thought about using a vac to do it but that only gets out less than half the oil from what I've read. Here's a pic with the port locations if anyone is interested.





Last edited by funflyer; 05/10/18 07:29 PM.

2016 Prius 1.8L
2001 Tacoma 2.4L
1966 GTO 6.5L
2015 Cub Cadet
Honda CT70 (X6)
Re: Cub Cadet Hydrostatic oil substitute [Re: funflyer] #4754178
05/11/18 12:26 PM
05/11/18 12:26 PM
Joined: Apr 2010
Posts: 48
ms
racinjason Offline
racinjason  Offline
Joined: Apr 2010
Posts: 48
ms
I havenít vacuumed a k46 because the gas tank is always in the way and typically dump them, the super cheap hydro gear rears(I e like a Troy Bilt horse) I get 2 qts out with a mighty vac.

A k46 may have something in the way to prevent full vacuuming.


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