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Hydrostatic Transmission Fluid #1982072 08/10/10 05:56 PM
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rclint Offline OP
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I have a Craftsman DYT 4000 with hydrostatic transmission with the unit never been serviced... However overall hours on the mower is low as well around 100 hours (with 10 or so of them maybe more being from switch being left on). I have read over post on servicing the "non service" transmission my question is what fluid to use ? I would love to hear from those that have done this, and also what fluid you used.. I would love to be able to get this local off the shelf..

I do have a 5 gallon bucket of Hy-Tran which is supposed to be outstanding fluid I use in my IH Cub Cadet Sundstrand transmission/pump & rearend

Re: Hydrostatic Transmission Fluid [Re: rclint] #1982149 08/10/10 07:40 PM
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JTK Offline
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Your DYT 4000 most likely has a Hydrogear brand hydrostatic drive. If you do dump and fill it, you will want to refill with a quality 20w50 motor oil.

Joel


2019 Nissan Pathfinder SV
2017 Ram 1500 4x4, 3.6L.
2015 Nissan Versa 1.6 S
Re: Hydrostatic Transmission Fluid [Re: JTK] #1982180 08/10/10 08:12 PM
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gd9704 Offline
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I used Mobil 1 extended performance 5w-50 in my tuff torq k51 and for a 2+ years has been A-1.


'14 Buick Regal AWD
'13 Cadillac SRX4
'09 John Deere X540
'82 Ariens 724 Sno Thro
'12 Honda EU6500is inverter generator
Re: Hydrostatic Transmission Fluid [Re: gd9704] #1982191 08/10/10 08:29 PM
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sweezy722 Offline
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If the unit has a tag on it saying hydrogear then JTK is correct. The service department at hydrogear is very friendly and told me 2 years ago that plain 20-50 motor oil is all you need to refill with. He told me that they had 2 models that used something different but they were something out of the ordinary.

If it is a tuff torq unit then it most likely will take 10-30 motor oil.

Re: Hydrostatic Transmission Fluid [Re: sweezy722] #1982199 08/10/10 08:38 PM
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rclint Offline OP
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Thanks for the info, I will check the tag for sure before changing the fluid..

Re: Hydrostatic Transmission Fluid [Re: rclint] #1982309 08/10/10 10:14 PM
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motorcity Offline
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They are real easy to service. Theirs a black cap on top. just pry it off, and remove the magnet under it. And then turn the axle over on a drain pan to drain. When you are re-filling it, turn the fan and axle shafts, this helps bleed the air out of the internal pump.When your done putting the axle back in, its a good idea to run the tractor , with the rear wheels up in the air. this makes sure the system is bled of air.

Last edited by motorcity; 08/10/10 10:16 PM.
Re: Hydrostatic Transmission Fluid [Re: motorcity] #1983051 08/11/10 03:30 PM
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rclint Offline OP
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uhgg motorcity that sounds pretty involved !! You have to remove the axle from the tractor in order to do a fluid change ?

What is your opinion on the fluid, does it extend the life of the rear axle/pump when changing the fluid ?

Re: Hydrostatic Transmission Fluid [Re: rclint] #1983315 08/11/10 08:01 PM
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JTK Offline
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Originally Posted By: rclint
uhgg motorcity that sounds pretty involved !! You have to remove the axle from the tractor in order to do a fluid change ?

What is your opinion on the fluid, does it extend the life of the rear axle/pump when changing the fluid ?


It's not as bad as it sounds. Parking brake linkage, motion control linkage, drive belt and 4-6 bolts and it's off. Fresh clean oil in there can only help these units. The main thing for longevity is, keep the unit clean and dry and make sure the cooling fan is intact. I've seen badly neglected hydrostatic trans come back to life after an oil change.

Joel


2019 Nissan Pathfinder SV
2017 Ram 1500 4x4, 3.6L.
2015 Nissan Versa 1.6 S
Re: Hydrostatic Transmission Fluid [Re: JTK] #1983347 08/11/10 08:26 PM
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motorcity Offline
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Originally Posted By: JTK
Originally Posted By: rclint
uhgg motorcity that sounds pretty involved !! You have to remove the axle from the tractor in order to do a fluid change ?

What is your opinion on the fluid, does it extend the life of the rear axle/pump when changing the fluid ?


It's not as bad as it sounds. Parking brake linkage, motion control linkage, drive belt and 4-6 bolts and it's off. Fresh clean oil in there can only help these units. The main thing for longevity is, keep the unit clean and dry and make sure the cooling fan is intact. I've seen badly neglected hydrostatic trans come back to life after an oil change.

Joel


I have to agree, if you have a hilly yard to cut, I think the preventitive maintanence is a good measure. taking it out for the first time is a little bit of a pain. But i can have an axle out of a Cub Cadet in about 30 min. It helps if you have some help putting it back in, they need to guide the control rods in as you get the axle in position to raise back up.


Last edited by motorcity; 08/11/10 08:28 PM.
Re: Hydrostatic Transmission Fluid [Re: motorcity] #1983800 08/12/10 08:10 AM
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JTK Offline
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Originally Posted By: motorcity
...It helps if you have some help putting it back in, they need to guide the control rods in as you get the axle in position to raise back up.



Good plan right there mc. They can be a PITA to fiddle into place later on.

Joel


2019 Nissan Pathfinder SV
2017 Ram 1500 4x4, 3.6L.
2015 Nissan Versa 1.6 S
Re: Hydrostatic Transmission Fluid [Re: JTK] #1984866 08/13/10 09:16 AM
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motorcity Offline
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One other trick I do, is I put hairpin type clips back on, instead of cotter pins. It makes it alot easier next time.Some of the cotter pins can be a real pain to get out and back in. Due to their location, and sppace around them to try and bend them over and straiten them out.

Re: Hydrostatic Transmission Fluid [Re: motorcity] #1989272 08/17/10 10:20 PM
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AlanJW Offline
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I have a tuff torq tranny in my john deer, they told me to use 10w30? is that right, some of the other guys said 20w 50? I made the mistake of trying to use gear oil the first time.

Re: Hydrostatic Transmission Fluid [Re: AlanJW] #1990206 08/18/10 07:26 PM
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Brett Miller Offline
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I put Syntec 5W-50 in my K46 Tuff Torq.

Re: Hydrostatic Transmission Fluid [Re: Brett Miller] #1990323 08/18/10 08:46 PM
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motorcity Offline
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The Tuff torq's us a lighter oil than the Hydro gears. 20w-50 for Hydro Gear and 10w-30 in the Tuff Torqs. I put Amsoil Tractor Hydrualic Fluid in a Tuff Torq, with good results

Re: Hydrostatic Transmission Fluid [Re: motorcity] #1990459 08/18/10 11:10 PM
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AlanJW Offline
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ok, thanks, I still probably need to change the fluid again, not to sure I got all the gear oil out, Its Kinda sluggish when I start out in colder temps, but as i get gowing, it smoothes out

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