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  1. #11
    Veteran Member Kernopelli's Avatar
    Join Date
    Oct 2006
    Posts
    1,970
    Location
    Carterville, Illinois
    Tractor
    Mitsubishi MTE2000D, Dig It 258 Backhoe Deere Z930A ZTR

    Default Re: HyGuard J20C Trans fluid

    Quote Originally Posted by Deere Dude View Post
    Are you sure it is High Viscosity Hy-Gard?
    Yeah, the manual says "John Deere High Viscosity Hy-Gard (J20C)..... Do not mix oils. Do not use type F automatics transmission fluid, J20D Low Viscosity Hy-Gard, or Bio Hy-Gard".
    Darryl

  2. #12
    Bronze Member
    Join Date
    Aug 2012
    Posts
    52
    Location
    Missouri
    Tractor
    8N Ford, JD345, JD710A, JD2320

    Default Re: HyGuard J20C Trans fluid

    I just went out to the garage and looked at the one gallon (TY6354) container label, and it doesn't say anywhere it is High Viscosity oil. Just Transmission and Hydraulic Oil. I have JD345 tractor that runs with TY22035 Low Viscosity Hy-Gard oil. Two different types.

  3. #13
    Super Star Member
    Join Date
    Dec 2003
    Posts
    12,679
    Location
    NC
    Tractor
    Kubota Grand L3830

    Default Re: HyGuard J20C Trans fluid

    I use John Deere Hy-Gard oil in John Deere Equipment and the kubota Super hydraulic fluid in Kubota equipment.

    That is my equipment though. I am a firm believer that if a person wants to use, used motor oil in their own equipment, let them do so.

  4. #14
    Super Star Member
    Join Date
    Aug 2001
    Posts
    14,979
    Location
    Southern Wisconsin, USA
    Tractor
    JD_4x2_Gator, JD_4300, JD_X485, JD_425, JD_455, JD_110

    Default Re: HyGuard J20C Trans fluid

    Here is a chart by Deere about their oils.. trans oil begins on p 10

    https://jdparts.deere.com/partsmkt/d...01OilGuide.pdf

    May help with the confusion..

  5. #15
    Bronze Member
    Join Date
    Aug 2012
    Posts
    52
    Location
    Missouri
    Tractor
    8N Ford, JD345, JD710A, JD2320

    Default Re: HyGuard J20C Trans fluid

    I'm sure we all know that John Deere "doesn't" own a oil refinery, and has no faculty to make their own oils. John Deere may say they engineer their own oils and have a refinery to make it by their specs. Given that may be a fact, they still have someone to make the oils and chances are it may be a brand that is sold over the counter in some automobile stores or elsewhere. It turns out to be same as 10-W-30 oil



    Hy-Gard oil can be used in most transmission and hydraulic
    applications calling for 10W-30 or 5W-30 engine oil.
    NOTE: Hy-Gard should be used in all applications calling
    for JDM J20C.
    –– Low-Viscosity Hy-Gard should be used in all applications
    calling for JDM J20D.
    –– Low-Viscosity Hy-Gard and Hy-Gard are compatible with
    JDM J21A hydrostatic fluid and can be added to systems that
    contain hydrostatic fluid.

  6. #16
    Super Star Member
    Join Date
    Aug 2001
    Posts
    14,979
    Location
    Southern Wisconsin, USA
    Tractor
    JD_4x2_Gator, JD_4300, JD_X485, JD_425, JD_455, JD_110

    Default Re: HyGuard J20C Trans fluid

    Mo Lad
    You don't have a clue what JD does in their oil labs. And should look into the companies that they do own... 'nuff said.

  7. #17
    Platinum Member
    Join Date
    Feb 2013
    Posts
    945
    Location
    Pennsylvania
    Tractor
    Kubota L5060GST John Deere X758 Previously owned: J.D. 318, I.H. 354, J.D. 2350, JD 350B Crawler Loader

    Default Re: HyGuard J20C Trans fluid

    Quote Originally Posted by Kernopelli View Post
    Yeah, the manual says "John Deere High Viscosity Hy-Gard (J20C)..... Do not mix oils. Do not use type F automatics transmission fluid, J20D Low Viscosity Hy-Gard, or Bio Hy-Gard".
    Well you certainly can't go wrong by following what the owner's manual specifies.

  8. #18
    Platinum Member
    Join Date
    Apr 2011
    Posts
    577
    Tractor
    John Deere 2720

    Default Re: HyGuard J20C Trans fluid

    Quote Originally Posted by Deere Dude View Post
    Are you sure it is High Viscosity Hy-Gard? I have a CUT and have had larger JD garden tractors for decades and they all call for Lo-Vis.
    The Z930A operator's manual is pretty clear about the oil:

    Transmission and Hydraulic Oil
    NOTE: Tractor is filled with John Deere Hy-Gard (J20C) transmission oil at the factory.

    HyGuard J20C Trans fluid-z_oil-jpg

    Do not mix oils.

    Do not use type "F"automatic transmission fluid, J20D Low Viscosity Hy-Gard or Bio Hy-Gard.

  9. #19
    Elite Member Deere Dude's Avatar
    Join Date
    Feb 2011
    Posts
    3,310
    Location
    Beaver Dam Wisconsin then to Hohenwald, TN
    Tractor
    John Deere 3720

    Default Re: HyGuard J20C Trans fluid

    Quote Originally Posted by Oldoak View Post
    Well you certainly can't go wrong by following what the owner's manual specifies.
    I was going back and forth, regular hygard or lo vis, because the owners manual says it would use either, depending on the temperature, and because I heard of problems going to regular hygard. The JD service guy said to us regular. I was going to check the oil level on my JD CUT and noticed on the dipstick engraved, "Lo Vis Hy Gard." So O stuck with what was in already.
    JD 3720 with R4s and bulldozer capabilities.
    X740

    13 Millimeter = 1/2"--------25 Milimeters=1"-----------100 Millimeter = 4"----------1 Meter = 40---------1 Kilometer = 3300' or 5:8 ratio

    A 13mm will but will be just slightly larger than a 1/2" nut.

  10. #20
    Platinum Member
    Join Date
    Apr 2011
    Posts
    577
    Tractor
    John Deere 2720

    Default Re: HyGuard J20C Trans fluid

    Quote Originally Posted by Missouri Lad View Post
    I just went out to the garage and looked at the one gallon (TY6354) container label, and it doesn't say anywhere it is High Viscosity oil. Just Transmission and Hydraulic Oil. I have JD345 tractor that runs with TY22035 Low Viscosity Hy-Gard oil. Two different types.
    That is correct. The "normal viscosity" Hy-Gard is just labelled "Hy-Gard".

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