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Thread: Gearbox fluid change

  1. #1
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    Gearbox fluid change

    I have managed to get a ZF gearbox kit direct from ZF consist of filter,fluid,gasket, plus a couple of other bits,
    Took the car to a Land Rover specialists who has a flushing machine, he said they could do the job no problem but he suggested just flushing and replacing the fluid and not dropping the sump to replace the filter as itís more of a strainer than a filter, now I donít know what to do, as he said when they do a Land Rover they have never dropped the sump and never had any problems
    Any advise would be welcome
    XJL

  2. #2
    Senior Member Andy K's Avatar
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    There must be a book of lies that come with flushing machines

    No.1 The filter is more of a strainer than a filter.

    It's a fine paper filter.
    But I do agree with them, it isn't worth replacing or disturbing the sump gasket for.

    But if you have the fluid already, don't pay them to change it. Do it yourself!
    There are ways to get the fluid out the TC and you will refil with the correct fluid
    XJR 2001 Pacific Blue
    Range Rover Sport 2005 Red 2.7 TD

  3. #3
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    Thanks for the response Andy, can you point me to any instructions for getting all the fluid out without flushing
    XJL

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    Senior Member XJrazz's Avatar
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    When the filter reaches capacity, as with an engine oil filter, any additional crud gets circulated through the transmission. ZF recommends 60K mile/100K kilometer service interval including filter change. Seems foolish not to do the full service all at once. It's not worth the risk of damaging the transmission to save the cost of an hour's labor.

  5. #5
    Senior Member Andy K's Avatar
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    I have inspected a ZF filter at 100K miles. Yes there are some tiny metal flakes on it. But there is loads of filter left to do its job. I donít know why ppl think the filter stops working. That is only when itís 100% clogged and blown a hole thru.

    Do you have a sump drain on the gearbox pan? Q1

  6. #6
    Senior Member Andy K's Avatar
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    If you have a sump plug, what you can do is :

    1) Loosen but not remove the side level check plug, to ensure you can get new fluid in. Do not remove as it will make a mess
    2) remove sump plug and drain gearbox
    3) empty drain container.

    couple of options what to do next.

    If the car is not daily driver;

    Refit sump plug
    4) disconnect the gearbox cooler line at the front of the car
    5) leave the car for a week, to let gravity do its job
    6) re drain sump. You may well get another 2 litres out

    If the car is a use daily.
    4b) Leave the sump plug out with container under it.
    5b) Start engine and run for about 20 seconds.
    6b) Fluid will be pumped out the TC and into the sump and come out sump plug.
    XJR 2001 Pacific Blue
    Range Rover Sport 2005 Red 2.7 TD

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    Quote Originally Posted by Andy K View Post
    There must be a book of lies that come with flushing machines

    No.1 The filter is more of a strainer than a filter.

    It's a fine paper filter.
    But I do agree with them, it isn't worth replacing or disturbing the sump gasket for.

    But if you have the fluid already, don't pay them to change it. Do it yourself!
    There are ways to get the fluid out the TC and you will refil with the correct fluid
    I can quite assure you Andy, that there is not a book of lies that comes with my flushing machines.

    Do you have any expertise yourself?
    XF 3.0 D Luxury 2010. And no, chemical fixes can be handy, but do not replace technicians.

  8. #8
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    Thanks for all the advice guys
    I am confused as to how a flushing machine works, does the sump get drained then the flushing machin gets connected and pushes the rest of the fluid out? so you end up with a compleatly empty gearbox and TC?so this would be the time to replace the filter then fill with fresh oil?.
    I can’t see the point of filling with fresh oil/fluid and not replacing the filter on a nearly 20 year old car done 80000 miles
    XJL

  9. #9
    Senior Member Andy K's Avatar
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    Flushers donít get under the car

    You can use the procedure I outlined and change the filter during it.

  10. #10
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    Quote Originally Posted by Andy K View Post
    You can use the procedure I outlined and change the filter during it.
    Have you ever actually done this, on an X308 with ZF box (not an XJR)?

    How does your method deal with the requirement of bringing the engine/transmission up to operating temperature to get the correct (critical) auto fluid level?
    2000 Jaguar X308 4.0
    1973 Jensen Interceptor Mk III 7.2
    1969 Jensen Interceptor Mk I 6.3

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