John Deere 757 Hydro Fluid

[brandon9715]

Hello all,
I bought a used John Deere 757 zero turn earlier this year and I want to change the hydro oil. The mower currently has 390 hours on it. I see in the manual that John Deere specs a 15w40 hydro oil for the transmission. I have a preference for Amsoil products, but only see a 5w30 hydro oil and then straight weight ISO oils for large equipment. Any suggestions for a top-tier hydro oil? I am easy on my equipment, but I would like to keep this mower pristine. No reason to ever upgrade if I can keep it running.

Note: I did contact Amsoil technical support via email about suggestions, but have not heard back yet.

 

[JavierH19]

There's no 15w-40 hydro oil just motor oil that can be used in hydrostats even if not specified on the bottle since there's no approval. Hydrostat pumps are very small and to generate pressure you need thick oil. With thin hydraulic/transmission fluid they are super weak. You can use whatever 15w-40 or 15/20w-50 as well amsoil or not. Hydrostats don't run hot nor do the pumps run hard so the oil is probably still close to clear at 390 hours. I'm just running supertech in mine. Sounds like normal, old oil drained out pretty clear.

 

[volk06]

Hello all,
I bought a used John Deere 757 zero turn earlier this year and I want to change the hydro oil. The mower currently has 390 hours on it. I see in the manual that John Deere specs a 15w40 hydro oil for the transmission. I have a preference for Amsoil products, but only see a 5w30 hydro oil and then straight weight ISO oils for large equipment. Any suggestions for a top-tier hydro oil? I am easy on my equipment, but I would like to keep this mower pristine. No reason to ever upgrade if I can keep it running.

Note: I did contact Amsoil technical support via email about suggestions, but have not heard back yet.

Amsoil has a 20w-50 hydro oil. https://www.amsoil.com/p/amsoil-20w...LPNhQ9m9MEzKuR5cgLhORVrvHdvnkP2UYDZ4uvtFvoe35

Any 15w-40, 5w-40 HDEO would work well. Deere also has a really stout 0w-40 PAO based full synthetic HDEO.

 

[fantastic]

Also Tough Torque and possibly others have recommended 5w-50 or 15w-50. With some wear at 390 certainly shouldn't hurt. 15w-40 HDEO is what you're looking for on OEM replacement fluid.

 

[DriveHard]

There's no 15w-40 hydro oil just motor oil that can be used in hydrostats even if not specified on the bottle since there's no approval. Hydrostat pumps are very small and to generate pressure you need thick oil. With thin hydraulic/transmission fluid they are super weak. You can use whatever 15w-40 or 15/20w-50 as well amsoil or not. Hydrostats don't run hot nor do the pumps run hard so the oil is probably still close to clear at 390 hours. I'm just running supertech in mine. Sounds like normal, old oil drained out pretty clear.

Those pumps run HOT...and the heat is what will kill them if you don't use the right fluid and keep them clean (so they can cool).
Pumps DO NOT need high viz fluid to produce pressure...pumps don't even produce pressure...they produce flow. It is resistance to flow that produces pressure. Those pumps would be just fine on 12 cst fluid at operating temps.

Run what the manu. suggests, or a hydraulic fluid that matches the viscosity requirements.

 

[brandon9715]

Those pumps run HOT...and the heat is what will kill them if you don't use the right fluid and keep them clean (so they can cool).
Pumps DO NOT need high viz fluid to produce pressure...pumps don't even produce pressure...they produce flow. It is resistance to flow that produces pressure. Those pumps would be just fine on 12 cst fluid at operating temps.

Run what the manu. suggests, or a hydraulic fluid that matches the viscosity requirements.

I see Walmart has Delvac Extreme Duty 15w40 on sale for $20/gal right now. Good fit?

 

[userfriendly]

Amsoil has a 20w-50 hydro oil. https://www.amsoil.com/p/amsoil-20w...LPNhQ9m9MEzKuR5cgLhORVrvHdvnkP2UYDZ4uvtFvoe35

Any 15w-40, 5w-40 HDEO would work well. Deere also has a really stout 0w-40 PAO based full synthetic HDEO.

That’s right, it’s called Delvac 0W40.

 

[DriveHard]

I see Walmart has Delvac Extreme Duty 15w40 on sale for $20/gal right now. Good fit?

https://www.fleetfarm.com/search?Ntt=hydraulic+fluid

 

[brandon9715]

Update: Amsoil Tech Team got back with me. They recommend their 15w40 diesel oil (DME). Thinking I will try the Delvac Extreme for the $20/gal and sleep well.

 

[fantastic]

Update: Amsoil Tech Team got back with me. They recommend their 15w40 diesel oil (DME). Thinking I will try the Delvac Extreme for the $20/gal and sleep well.

That Delvac Extreme is a good product & affordable.

 

[Dutchy491]

$20/gal helps you sleep? Spend a few more dollars and use the Amsoil. Repair costs should give you nightmares….

 

[fantastic]

$20/gal helps you sleep? Spend a few more dollars and use the Amsoil. Repair costs should give you nightmares….

Mobil 1 is factory filled on Corvette, Mercedes-Benz, Cadillac, & others.

 

[brandon9715]

$20/gal helps you sleep? Spend a few more dollars and use the Amsoil. Repair costs should give you nightmares….

For a hydrostatic fluid in a residential zero turn I am not as concerned. The Delvac will be more than sufficient. Most homeowners never replace the oil and still go 2,000 hours or more.