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I am coming up on my 50 hour service for my 1025R and have found some interesting information on the trans/hydro oil. This information may have been discussed before but I could not find it on a search. I apologized if this has already been discussed.

As per the service manual and my dealer all 1025R come from the factory with low vis hy-guard no matter where the tractor is shipped in the country. On the dip stick is says to use low vis hy-guard. However, On the back of the low vis hy-guard bottle is says to use in ambient temps from -44 to 86 degrees F. On the bottle of Hy-guard is says to use in ambient temps of some around -15 to 122 degrees F. I have questioned several people at my dealer on this as my 1025R is used in 90 degrees plus quite often. Me dealer tells me that Deere says to use the low-vis in the 1025R and other Scut and mowers not matter what the ambient temp is because it hydrostat trans needs the low vis. The standard hy-guard is not designed to be used in those hydrostats. Has anyone heard of this? Is anyone using the standard hy-guard?

I have owned a 445 for 16 years and been using the low-vis in it's hydrostat and never had a problem with it. And I have mowed many many times in 100 degrees plus for 6 and 8 hours at a time. So maybe there is no problem here. Just a little second guessing myself with the product label contradicting what the manufacture is recommending. Thanks.
 

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I am coming up on my 50 hour service for my 1025R and have found some interesting information on the trans/hydro oil. This information may have been discussed before but I could not find it on a search. I apologized if this has already been discussed.

As per the service manual and my dealer all 1025R come from the factory with low vis hy-guard no matter where the tractor is shipped in the country. On the dip stick is says to use low vis hy-guard. However, On the back of the low vis hy-guard bottle is says to use in ambient temps from -44 to 86 degrees F. On the bottle of Hy-guard is says to use in ambient temps of some around -15 to 122 degrees F. I have questioned several people at my dealer on this as my 1025R is used in 90 degrees plus quite often. Me dealer tells me that Deere says to use the low-vis in the 1025R and other Scut and mowers not matter what the ambient temp is because it hydrostat trans needs the low vis. The standard hy-guard is not designed to be used in those hydrostats. Has anyone heard of this? Is anyone using the standard hy-guard?

I have owned a 445 for 16 years and been using the low-vis in it's hydrostat and never had a problem with it. And I have mowed many many times in 100 degrees plus for 6 and 8 hours at a time. So maybe there is no problem here. Just a little second guessing myself with the product label contradicting what the manufacture is recommending. Thanks.
My dealer told me the same thing.


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My 2¢:

It's not ambient temperature that specifically dictates viscosity, it's the temperature of the fluid when at working temperature. Since we don't change the fluid according to the seasons, I use the fluid that mostly falls into the ambient temperature guidelines for my use.

I use low visc, too. :good2:

Jd seems to be full of these broad sweeping specifications that are quite confusing and contradicting.

:unknown:
 

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I used the regular hy-guard due to the ambient temp listed on the bottle and in the owner's manual. I keep track of pump temps when doing various work in high heat and with the regular the pump seems to stay about the same as it was last year in the heat.

My dealer stated they put regular hy-guard in everything.

With the regular in the tractor seems to have a little more oomph with a little more speed.
 

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In my area , we have three different large multi location JD Dealers, I like this as I use all three for information. With this question on which oil to use in the hydro in the 1025R they all confirm the same. Use the Low Vis
 

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I used the regular hy-guard due to the ambient temp listed on the bottle and in the owner's manual. I keep track of pump temps when doing various work in high heat and with the regular the pump seems to stay about the same as it was last year in the heat.

My dealer stated they put regular hy-guard in everything.

With the regular in the tractor seems to have a little more oomph with a little more speed.
Umm... Low visc j20d has just over 2 centistokes thinner than j20c at 100°C, and at 40°C it's 26 centistokes thinner; thinner oil may mean less protection from shear wear, but faster flow due to less resistance.

Call it psychsomatic but I swear my loader and hoe working speed increased, and my feathering of the controls was easier after changing to Low

:lol:
 

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The other week when the tractor was delivered I also bought 6 gal of hyd fluid . Till now I had no idea what , I just looked at the invoice Low Hy-guard.
 

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My 2¢:

It's not ambient temperature that specifically dictates viscosity, it's the temperature of the fluid when at working temperature. Since we don't change the fluid according to the seasons, I use the fluid that mostly falls into the ambient temperature guidelines for my use.

I use low visc, too. :good2:

Jd seems to be full of these broad sweeping specifications that are quite confusing and contradicting.

:unknown:
Actually it is both. The low ambient dictates the oil flow point when the transmission is at -18F (Hyguard) or -44F (low Visc Hyguard) If trans is below -18 F with hyguard in it, it may not circulate well enough to lubricate. Conversely if above 86F with low visc Hyguard, it may not maintain sufficient fluid film integrity during hard use where the fluid temperatures rise significantly to keep the parts from contacting metal to metal. This is the reason Ron can get away with easily running Hyguard down south and those in Alaska need to run low visc hyguard. Personally for how many times the trans will get down to -18 in PA, I will put a heater on it and heat it up. I use it very hard in the summer, so I would rather the protection then. No different that your engine oil fellas. Once it is running the fluid temp will always be above ambient, it is just start up that deer is worried about. So buy a pan heater if you are worried. Unless of course your tractor is outside and it is always -18 or below. Shame on Deere if the product varies that much and they say in the book you can use either. They should be called something totally different if it is that. This cryptic nonsense of theirs needs to stop.:nunu:
Bill
 

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Use the Low Vis

Use the Low Vis, it is the "preferred" fluid. Unless you live in and constantly operate your machine in temperatures above 110 degrees you will be fine. The new technology pumps, transmissions are designed to use low vis. Remember there is a fluid cooler located in front of the radiator that WILL KEEP THE OIL TEMP in the correct operating range in hot weather. Low vis is more important when operating in cold temperatures than in high temperatures but be assured the transmission will be completely protected. I have used it for years in my machines and have NEVER had an issue. As a general rule of thumb I change my fluids and filters every 200 hours, thats just cheap insurance.
 
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