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  1. #1
    Silver Member Rockin' G Ranch's Avatar
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    Apr 2008
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    213
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    Point Blank, TX
    Tractor
    Kubota L4740 HST with FEL

    Default Grease vs Gear Oil

    My Agric tiller gear box leaks so bad that I can't keep it full for long jobs. I don't want to tear it apart to change all of the gaskets and oil seal. What do ya'll think about just filling the gear box with grease?

  2. #2
    Platinum Member Mighty Dodge's Avatar
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    Jan 2007
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    505
    Location
    The Hereford Zone, MD
    Tractor
    JD 4200

    Default Re: Grease vs Gear Oil

    Grease being thick wont flow to the bearings or other internal parts, gears, chain, etc. It's best to fix replace the seals, gaskets etc. That way you can also check the other internal parts to make sure the parts are in good order and show no unusual wear.

    M.D.
    2001 JD 4200, 420 loader, HF Quick Hitch, bucket boom, back blade, boom pole, forks, carry-all, moldboard plow, middle buster, receiver hitch, post hole digger.

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  3. #3
    Platinum Member ampsucker's Avatar
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    Dec 2007
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    573
    Location
    Southeast Kansas
    Tractor
    BX24

    Default Re: Grease vs Gear Oil

    yeah, i would skip on the grease. too thick.

    if you just want to get through the season, i would get something like STP motor honey or equivalent. it is thick as molasses but still flows and flows better when hot. it will still lube but won't leak as bad.

    work it through the summer, then rip it apart and fix the seals this winter when you have some down time and want to work next to the wood stove in the shop....

    amp
    Kubota BX24 (loader, hoe, 60" belly); Ford 800 tractor; Scott's/Deere 42" mower; 5' and 6' rear blade; 54" Howse tiller; 20' 7,000 lb carhauler trailer; 2 other trailers; 5' dethatcher; 10" single bottom moldboard plow; middle buster plow; 600 lb roller; 3pt auger; front tire chains; Stihl and Honda small engine equip.

    Growing with you season by season.

  4. #4
    Veteran Member Kays Supply's Avatar
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    Jul 2006
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    1,119
    Location
    Southern Illinois
    Tractor
    Iseki TA 207

    Default Re: Grease vs Gear Oil

    Lucas additive straight, is what they put in leaky 4x4 front ends and tillers etc. It is a patch like mentioned above.

  5. #5
    Super Star Member
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    Feb 2006
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    10,226
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    VA
    Tractor
    JD2010, Kubota3450,2550, Mahindra 7520 w FEL w Skid Steer QC w/Tilt Tatch, & BH, BX1500

    Default Re: Grease vs Gear Oil

    Quote Originally Posted by Rockin' G Ranch
    My Agric tiller gear box leaks so bad that I can't keep it full for long jobs. I don't want to tear it apart to change all of the gaskets and oil seal. What do ya'll think about just filling the gear box with grease?
    NLGI#2 has worked well for me for many years in a bushog in heavy use that shakes it a bit. NLGI1 would probably be fluid enuf for a tiller to shake it into the bearings. Maybe mix in a little gearoil occasionaly
    larry

  6. #6
    Epic Contributor Bird's Avatar
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    Mar 2000
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    Texas

    Default Re: Grease vs Gear Oil

    I, too, would be reluctant to use grease instead of gear oil, but I had a neighbor who said he filled his with grease when the gear oil leaked out and that he'd been using it that way for 10 years.
    Bird

  7. #7
    Veteran Member
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    Nov 2003
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    1,366
    Location
    Tombstone Az
    Tractor
    KIOTI LK30

    Default Re: Grease vs Gear Oil

    How about some of the grease they put in the bottom end of outboard motors. Ought to work just fine.

  8. #8
    Epic Contributor Bird's Avatar
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    Mar 2000
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    Texas

    Default Re: Grease vs Gear Oil

    Quote Originally Posted by Jimbrown
    How about some of the grease they put in the bottom end of outboard motors. Ought to work just fine.
    Jim, I've changed the oil in the lower unit of Evinrude, Johnson, and Mercury outboard engines and none used a thicker oil than the 80W-90 gear lube. In fact, I think they were all considerably thinner.
    Bird

  9. #9
    Silver Member
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    Jun 2007
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    155
    Location
    Madison, WI
    Tractor
    John Deere 790

    Default Re: Grease vs Gear Oil

    What do folks think of that Farm Oyl brand "Fluid Gear Grease" for gearboxes and the like? Comes in a bottle like 90w, but it's thicker, more like grease. Seems to be a good compromise combination, flowing like 90w-ish oil, but thick enough not to leak past housing gaskets and shaft seals. We bought a used 5' KK rotary cutter last year, and the gearbox content looked something like Kahlua (obviously mixed with water). Replaced it with that Farm Oyl stuff, and have run it for 50 hours, so far so good.

  10. #10
    Veteran Member Glowplug's Avatar
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    Oct 2006
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    3rd Planet from the Sun
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    Kubota M7040HD

    Default Re: Grease vs Gear Oil

    There is a such thing as NLGI #00 grease. It's sort of a semi-liquid state, like a slime. It will flow like an oil but is much more viscous. It's basically what they put in the Rhino mower gearboxes. Works really well for leaky gearboxes. I know that Texas Refinery Corp. makes some that looks to be a superior product. It is called Millenium 2200. I actually had thought about getting some and replacing all my gear oil with it.
    Chuck

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