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  1. #1
    Veteran Member
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    Default Fluid in the front axle and a front tire pressure w/loader? L3940

    We were checking all the fluids yesterday, took delivery this week and everything
    looks fine except the front axle didn't show any oil when I backed out the check
    level plug. I took the fill plug out and twisted up a clean blue shop towel stuck it in and
    it appears to be 1/8 - 1/4" low. Now according to my manual you can run
    UDT, Super UDT or SAE80-SAE90 gear oil in the front axle. Well maybe I'm
    thinking wrong but in my mind there's a big difference in Hydraulic oil and
    Gear oil? I want to pick up some but I have no way of knowing exactly
    what's in there when the manual gives you 3 choices. I guess I may call the
    dealer tomorrow and see what they put in there because if I'm not mistaken
    they're shipped dry, as the front axle appeared to be partially disassembled
    when I saw it in the crate.

    Now for the tire pressures on our L3940. The tires are R4's the rears are filled
    and the check off sheet says they set them to 19psi and the fronts to 45psi.
    The manual says for 10-16.5 6PR use 20psi, the loader manual says the same
    thing and doesn't mention anything about increasing the pressure in the front
    for a loader. This is our first 4WD tractor so you'll have to excuse all the
    questions, I did search the forum for tire pressure but didn't really find what
    I wanted.
    Thanks
    Last edited by Grateful11; 04-18-2010 at 11:44 PM.

  2. #2
    Super Member bp fick's Avatar
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    Beaver Creek, Northern Michigan
    Tractor
    Kubota BX2360

    Default Re: Fluid in the front axle and a front tire pressure w/loader? L3940

    Having the front axle read low upon delivery is pandemic. The fact is that these front axles hold a lot of lube. The dealers sometimes fail to top off, and even if they do, if you use it an hour or two, the air gets worked out and they read low. Top it off. Check again in a week. This is widespread issue that isn't really an issue at all, just the nature of the beast.

    You will get a lot of pro udt and sudt support here, but an equal amount of firm believers in gear lube. Myself? I'm not a zealot either way, but there's gear lube in mine. 75w-90 gear lube. Semi-synthetic. Sold almost everywhere. WalMart, TSC, Auto Parts Stores, you name it. Shoot, K-Mart likely has it. Standard GL-5 80w-90 is sold everywhere.

    Air pressure. Just checked all four of mine today. I run 2 lbs lower than the sidewall recommended MAXIMUM. Good to remember that sidewall is the max, not the normal, imho. Work off of what's on the sidewall from the tire builder. You could safely go 4-6 lbs off that, if you want a softer ride.
    BP


    "Some chickens, some gardens and a Kubota."

  3. #3
    Elite Member dex3361's Avatar
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    3,570
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    N. of Charleston WV
    Tractor
    Kubota L4400-1 HST,FEL, 3x3 remotes, TNT. BX1500 54 mmm

    Default Re: Fluid in the front axle and a front tire pressure w/loader? L3940

    Most of the kubota tractors come with SUDT in the front axle but the good thing is the UDT and SUDT are compatible. Pick up some UDT and top it off. When you change the front axle fluid out put the 80-90 gear oil back in. The front tires are good to fill to about 5 psi below the max tire (side wall stated) rated pressure with a loader. R4s are not as bad to roll a tire off the rim.
    Randall



    1Timothy Chapter 2:
    3 For this is good and acceptable in the sight of God our Saviour;
    4 Who will have all men to be saved, and to come unto the knowledge of the truth.
    5 For there is one God, and one mediator between God and men, the man Christ Jesus.
    From: The HOLY BIBLE

  4. #4
    Super Member RickB's Avatar
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    7,621
    Location
    Eastern NY
    Tractor
    Case 885, Ford 4000

    Default Re: Fluid in the front axle and a front tire pressure w/loader? L3940

    Remove one of the drain plugs and let enough oil out to figure what it is. Buy some and top off.
    We have too much gun control.
    What we need is more idiot control.

  5. #5
    Elite Member Ken45101's Avatar
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    Feb 2009
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    southern Ohio
    Tractor
    Kubota M5040, M9540, B21 TLB, B2710, RTV900, JD 325 Skid steer, KX-121-3 mini excavator

    Default Re: Fluid in the front axle and a front tire pressure w/loader? L3940

    Air pressure. Just checked all four of mine today. I run 2 lbs lower than the sidewall recommended MAXIMUM. Good to remember that sidewall is the max, not the normal, imho. Work off of what's on the sidewall from the tire builder. You could safely go 4-6 lbs off that, if you want a softer ride.
    At least on the bigger tractors (e.g. M5040) with R1 tires, their tire capacity is well below the loader capacity and really sag under load if not inflated to max. I've been afraid of breaking the bead loose when I have a full bucket.

    It seems that the loaders are rated much higher than the rubber that has to support them

    Ken

  6. #6
    Gold Member
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    Nov 2009
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    338
    Location
    Grimes County, Texas
    Tractor
    Kubota GL 3940

    Default Re: Fluid in the front axle and a front tire pressure w/loader? L3940

    The service dept at my dealer told me the tractor was shipped with SUDT in the front axle but at the first service, if they were doing it, they would change to the 80-90 gear lube. Not only do they like the viscosity better but it's cheaper for the customer than the SUDT. So that was my course. I topped up with SUDT (the remainder will be used during the HST service) and I will change to the 80-90 1st service.
    Kubota GL 3940, FEL w/ssqa, third function valve, grapple, 6' Landpride cutter, 6' landscape rake, 6' box blade, post hole auger

    "Knowledge is knowing the street is one way. Wisdom is still looking both ways before crossing"

  7. #7
    Veteran Member
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    Default Re: Fluid in the front axle and a front tire pressure w/loader? L3940

    I called the dealer and asked for some in the service dept. and he said they
    fill them with UDT and said the same thing that's been mentioned here that
    after a few hours use they usually work the air and stuff out and the level
    drops a bit. I really like the Service guys at the dealership where we bought
    it but the one salesman we dealt lacks a lot to be desired, first you don't tell
    a customer what they want if the customer has a pretty good idea of what
    they want. We're planning on getting a backhoe and grapple when we can
    and I mentioned getting a mechanical or hydraulic thumb for the BH and he
    said, "what would you need that for?" I'm thinking to myself that's my business
    and not yours. We have 85 acres here at the farm, 12 acres a 1/4 mile up the
    road and rent another 10 acres so yes I can think of a lot things I could do
    with a BH and a thumb. I guess I should have mentioned that he first recommended
    that we rent a mini excavator instead of even considering a BH. My wife is
    even thinking of a 72" belly mower but that's got to be some pretty big bucks.
    She'd like to have it for clipping pastures instead of using a bush hog but
    the kubota belly mower looks difficult to install, I don't see a drive over
    option or rotating castors.

    I'm getting way Off Topic gotta stop.

  8. #8
    Veteran Member
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    Default Re: Fluid in the front axle and a front tire pressure w/loader? L3940

    I did check the sidewall on the fronts and sure enough it says 45psi max.
    I may drop them by 5 psi and see it rides a bit better. I know what y'all mean
    about front tires and heavy loads with loader our IH 574 has a Manure
    bucket and when it's slam full it's a load and I've seen the sidewalls do
    pretty serious flexing.

  9. #9
    Veteran Member
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    Default Re: Fluid in the front axle and a front tire pressure w/loader? L3940

    Well it took an entire quart in the front axle before I got anything out the
    check hole. Seems the dealers need to drive them around the building and
    let them set for a few minutes and check the level before sending them on
    their way.

  10. #10
    Super Member bp fick's Avatar
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    Beaver Creek, Northern Michigan
    Tractor
    Kubota BX2360

    Default Re: Fluid in the front axle and a front tire pressure w/loader? L3940

    Problem is it takes more than a drive around the building to work the air out.
    Hopefully, the dealer or the manual reminded you to check the fluid levels, for exactly this reason. Good job. One quart out of 2-3 gallons isn't much.
    BP


    "Some chickens, some gardens and a Kubota."

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