Gear oil weight for 54D MMM
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Thread: Gear oil weight for 54D MMM

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    mjarmstr's Avatar
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    Gear oil weight for 54D MMM

    I've got about 480 more hours to put on my mower deck until the first oil change, but since I put it up vertically on wheels for the winter it leaked quite a bit before I got it plugged so I'm assuming I may have to top off the gear box in the spring. The manual only says:
    Gear Oil
    Use oil viscosity based on the expected air temperature range during the period between oil changes.
    John Deere GL-5 Gear Lubricant is recommended.
    Other oils may be used if they meet one or more of the following:
    • API Service Classification GL-5.
    • Military Specification MIL-L-2105D.
    • Military Specification MIL-L-2105C.
    • Military Specification MIL-L-2105B.
    Oils meeting Military Specification MIL-L-10324A may be used as arctic oils.
    The manual for my 1025R has similar verbage but also has an accompanying chart of oil weight vs temperature range. I'm wondering if I can use the same 80W-90 gear oil I have for my snow blower. I was thinking probably not considering the differing temperatures winter/summer and different PTO speeds of the attachments. I found this chart that makes it seem like mid summer mowing would be pushing it for 80W-90 but I might be okay if I'm just topping off and not doing a full oil change.

    This also makes me wonder about the tractor itself. I won't put enough hours a year on it change the oil more than once a year or so according to the maintenance intervals so where should my bias be for choosing oil weight considering that here in Iowa I may be moving snow when it is below 0 and mowing when it is over 100.
    - Mike

    2014 1025R

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    Captain Hook Kennyd's Avatar
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    The 80-90w would work great, its not picky. I would not wait till 500 hours either!
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    Kenny

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    RandyM's Avatar
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    I changed the gear lube after the first year in both my 62 and 72 inch decks. I use Mobil 1.
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    cheesetrain's Avatar
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    I'd have to check the bottle in the garage to be sure, but the John Deere GL5 the book recommends is 80W-90. The 60" deck uses the same. My gearbox was low when I got the tractor.


    Sent from my iPhone using Tapatalk
    1025R w\ block heater and one rear work light
    H120 FEL w 53" bucket, 54" QH blade, 60" MMM w\ autoconnect, mulch kit and independent lift kit
    JD 3 bag MCS with powerflow
    Land Pride RTA1250 tiller and CA1556 core aerator
    Imatch Quick Hitch
    JamisonBryce MCS Imatch adapter
    Heavy Hitch weight bracket & sub soiler combo
    CMP Attachments 60" HD front dethatcher
    Garber 72" 3pt mount drop spreader
    Countyline 3pt PHD with 9" diameter auger

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    mjarmstr's Avatar
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    OK sounds like I'd be fine with the 80W-90...
    - Mike

    2014 1025R

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    cheesetrain's Avatar
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    This is what is used in the 60" MMM

    Click image for larger version. 

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    Bill56 likes this.
    1025R w\ block heater and one rear work light
    H120 FEL w 53" bucket, 54" QH blade, 60" MMM w\ autoconnect, mulch kit and independent lift kit
    JD 3 bag MCS with powerflow
    Land Pride RTA1250 tiller and CA1556 core aerator
    Imatch Quick Hitch
    JamisonBryce MCS Imatch adapter
    Heavy Hitch weight bracket & sub soiler combo
    CMP Attachments 60" HD front dethatcher
    Garber 72" 3pt mount drop spreader
    Countyline 3pt PHD with 9" diameter auger

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    mjarmstr's Avatar
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    Thanks
    - Mike

    2014 1025R

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