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  1. #1
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    Default KB 280 gearbox oil change

    Howdy. I suspect my GB oil is lower than it should be. I'm driving a bit of a distance in the coming days. I've never changed the oil myself. So .... seeing spanners.

    I have looked underneath and see a drain plug that is in the protection plate, which to me looks like the transfer case, with a filler plug up the rhs, also what looks like a filler plug for the gearbox a bit further up on the rhs.

    Could anyone confirm where I must drain and where I must fill.

    What spanner sizes i must go buy, I'm on holiday at Keurbooms, with not much tools.

    Then.... which oil....
    Last edited by ZuluCowboy; 2021/01/13 at 07:31 AM.
    Mercedes W123 300D, runs on Mother Natures Goodness.
    Powered by the Sun, the Rain and the Earth.
    Have now covered 270 000Km on veg oil.
    Oh, and an Isuzu 280DT, 40 000Km on Bio Diesel
    Rand for Rand gets 33Km/L

  2. #2
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    Default Re: KB 280 gearbox oil change

    Drain plug under gear box, on side of gear box is filler. I am not sure if the 280 is same as the the 250 gear box. Best oil for gear box is CASTROL BOT 402, pricey but worth it. If you not sure, then just take bakkie to a mechanic with your gearbox oil and get them to do a quick change. The filler plug on mine is on drivers side close to body, I always end up with gearbox oil running down into my arm pits as those bottle straws tend to leak when squirting oil into gearbox.
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  4. #3
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    Default Re: KB 280 gearbox oil change

    The TC is seperate on the 4x4 models.
    The filler is halfway up the GB (size 24 metric iirc)and drain at the bottom. If youre doing it yourself be carefull with the threads they dont take much to strip.

    Been running mine on 'Sakkies' mix of Bot402 and CastrolGTX 15w40 for a number of years- All Good.

    Filling the GB can be a messy job..haha.

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  6. #4
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    Default Re: KB 280 gearbox oil change

    As an extra tip, remove the filler plug first before removing the drain. That way you know you can definitely refill it once drained.

    I would also suggest BOT 402. Do not fill the box with normal GL4 gearbox oil. It messes up some stuff. So BOT 402....
    2008 KB300 D-TEQ 4x2

  7. #5
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    Default Re: KB 280 gearbox oil change

    As already mentioned, do not use gear oil. These boxes are designed for 15w40 engine oil, although a lot of people have a hard time believing that, it is true. Castrol's BOT 402 was formulated specifically for these gearboxes, but if you find it difficult to obtain, or too pricey, you can use the engine oil.

  8. #6
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    Default Re: KB 280 gearbox oil change

    Ok. Found the drain, on the left of the gearbox and filler on the right. Will go buy some BOT402 and a 24...and some toilet paper. Thanks.
    Mercedes W123 300D, runs on Mother Natures Goodness.
    Powered by the Sun, the Rain and the Earth.
    Have now covered 270 000Km on veg oil.
    Oh, and an Isuzu 280DT, 40 000Km on Bio Diesel
    Rand for Rand gets 33Km/L

  9. #7
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    Default Re: KB 280 gearbox oil change

    Ok. Plett Midas has BOT 402. R183 per litre. How many will I need? 3 or so?
    Mercedes W123 300D, runs on Mother Natures Goodness.
    Powered by the Sun, the Rain and the Earth.
    Have now covered 270 000Km on veg oil.
    Oh, and an Isuzu 280DT, 40 000Km on Bio Diesel
    Rand for Rand gets 33Km/L

  10. #8
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    Default Re: KB 280 gearbox oil change

    According to the owner's manual, the gearbox takes 1.55 liters if it is a 4x2, and 2.95 liters if it is a 4x4. No idea why the 4x4 gearbox will take more, as this does not include the transfer case.

    Then if it is a 4x4, the transfer case takes 1.45 liters.

    So in the case of a 4x4, you will need a minimum of 4.4 liters.

  11. #9
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    Default Re: KB 280 gearbox oil change

    Scan of the relevant page, sorry, not great, but readable:
    Attached Images Attached Images  

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  13. #10
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    Default Re: KB 280 gearbox oil change

    Best to find a hoist or a pit to use to do this.

    When we were travelling in Zambia and needed similar for the 4x4 D/Cab we found a tyre shop who did it for us for a nominal charge. We supplied the oil.
    Also much easier if they have a pump rather than trying with the bottles.
    That was quite a few years back though.
    Peter Hutchison
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  14. #11
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    Default Re: KB 280 gearbox oil change

    Quote Originally Posted by ZuluCowboy View Post
    Ok. Found the drain, on the left of the gearbox and filler on the right. Will go buy some BOT402 and a 24...and some toilet paper. Thanks.
    Drain should be under gearbox near propshaft side if 4x2.
    Isuzu STD 2.5d 2x4 rear diffy lock
    2x spotlight,2x fog lights
    215/80/R15c tyres
    1 x great humourous driver
    GPS,Bluetooth
    Eagle eye dash cam --stolen ..bought another one
    snorkel soon
    Craig
    I DON'T LIVE IN AFRICA,AFRICA LIVES IN ME- Kyle my son

  15. #12
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    Default Re: KB 280 gearbox oil change

    I got it done. Funny thing, on the filler plug, it says fill engine oil.

    Anyway, bought a 60 ml syringe and did a few fill ups and eventually got all the oil into the box. Had an eager assistant who put on latex gloves to save the mani.

    The drain is on the left, and the filler on the right. On the transfer case, the drain is at the bottom and the filler on the right.
    Mercedes W123 300D, runs on Mother Natures Goodness.
    Powered by the Sun, the Rain and the Earth.
    Have now covered 270 000Km on veg oil.
    Oh, and an Isuzu 280DT, 40 000Km on Bio Diesel
    Rand for Rand gets 33Km/L

  16. #13
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    Default Re: KB 280 gearbox oil change

    Quote Originally Posted by ZuluCowboy View Post
    I got it done. Funny thing, on the filler plug, it says fill engine oil.
    See post #5

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  18. #14
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    Default Re: KB 280 gearbox oil change

    Quote Originally Posted by ZuluCowboy View Post

    Anyway, bought a 60 ml syringe and did a few fill ups and eventually got all the oil into the box. Had an eager assistant who put on latex gloves to save the mani.

    .
    Must have qualified you as a vaccine doctor lots of syringe fulls of oil.
    Isuzu STD 2.5d 2x4 rear diffy lock
    2x spotlight,2x fog lights
    215/80/R15c tyres
    1 x great humourous driver
    GPS,Bluetooth
    Eagle eye dash cam --stolen ..bought another one
    snorkel soon
    Craig
    I DON'T LIVE IN AFRICA,AFRICA LIVES IN ME- Kyle my son

  19. #15
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    Default Re: KB 280 gearbox oil change

    Changing the subject a bit, I had to drain diesel fuel tank to drop it and fit new sender unit in. Dam that diesel really is a thick oil to syphon out. Here I thought it would syphon out fast but noooo. I always wonder why a fuel tank does not have a drain plug.
    Isuzu STD 2.5d 2x4 rear diffy lock
    2x spotlight,2x fog lights
    215/80/R15c tyres
    1 x great humourous driver
    GPS,Bluetooth
    Eagle eye dash cam --stolen ..bought another one
    snorkel soon
    Craig
    I DON'T LIVE IN AFRICA,AFRICA LIVES IN ME- Kyle my son

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