Author [NL] [FR] [ES] [DE] [SE] [IT] Rear drive fluid replacement  (Read 2583 times)

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  • Offline JerseyJeff

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    Offline JerseyJeff

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    Rear drive fluid replacement
    on: Sep 05, 2020, 12.52 pm
    Sep 05, 2020, 12.52 pm
    I've read both things, to replace the fluid is good, because there is wear going on inside. And I've read, it's only necessary to change out the fluid once, after the break in and never again.

    I'm feeling like the first is true, it does need to be done every so often. What can it hurt to put fresh, clean fluid in the drive right ?

    Anyone have thoughts to contribute ? Do I need Triumph gear oil, or will any 90 Wt. automotive oil do ?

  • Offline Rick505   us

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    Offline Rick505

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    Re: Rear drive fluid replacement
    Reply #1 on: Sep 05, 2020, 02.31 pm
    Sep 05, 2020, 02.31 pm
    Other than the thread(s) where others have weighed in on the subject, I believe the spec is 75W90.  The manual calls for replacing once at initial service.  Others make their own decisions and will replace at each oil change, annually and or at some other interval they choose.  I'd suggest, and you get what you pay for, make a decision that you are comfortable with and go ride.

  • Offline Coconut   gb

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    Offline Coconut

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    Re: Rear drive fluid replacement
    Reply #2 on: Sep 05, 2020, 03.50 pm
    Sep 05, 2020, 03.50 pm
    The Owners Handbook specifies the Final Drive Oil as :
    Castrol SAF-XO Fully Synthetic Hypoid Gear Oil.

    I believe that this has now been superceded ( by Castol ) and is now sold as :
    Castrol Syntrax Longlife 75W-90 Fully Synthetic Gearbox Oil.

    As long as whatever you buy meets the same specifications,
    I can't see any problem using a different brand, especially
    when draining all the exisitng oil out for a complete oil change,
    compared to just Topping Up, where it is my personal preference
    not to "mix and match" wherever possible.

    Cheers  :821:




  • Offline JerseyJeff

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    Offline JerseyJeff

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    Re: Rear drive fluid replacement
    Reply #3 on: Sep 06, 2020, 09.05 pm
    Sep 06, 2020, 09.05 pm
    Picked up Valvoline, full synthetic Synpower (?) 75-90 wt.  And yes, I'll drain the entire rear and replace. Thanks Coconut.
    Since I don't have an owners manual, not sure about the specs. The stuff I bought says SAE J2360  Api GL-5 and 4,  and MT-1. Hypoid differentials  conventional and limited slip. :087:

  • Offline darmah59   us

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    Offline darmah59

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    Re: Rear drive fluid replacement
    Reply #4 on: Dec 06, 2020, 11.11 am
    Dec 06, 2020, 11.11 am
    Fill for life, means fill for life. Once the initial wear is over, and you are 100% sure it has been replaced once just leave it alone.
    If it ain't broken dont fix it.

  • Offline Merlot

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    Offline Merlot

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    Re: Rear drive fluid replacement
    Reply #5 on: Dec 06, 2020, 12.29 pm
    Dec 06, 2020, 12.29 pm
    Just to pitch my two penneth worth, I change the final drive oil usually around the time I replace the rear tyre.  I don't know of any oil that keeps its lubrication properties over years.  A cheap and easy insurance.
    Torque setting for both the fill and drain plugs are 25NM.
     :002:

  • Offline STJIM   us

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    Offline STJIM

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    Re: Rear drive fluid replacement
    Reply #6 on: Dec 06, 2020, 01.13 pm
    Dec 06, 2020, 01.13 pm
    *Originally Posted by Merlot [+]
    Just to pitch my two penneth worth, I change the final drive oil usually around the time I replace the rear tyre.  I don't know of any oil that keeps its lubrication properties over years.  A cheap and easy insurance.
    Torque setting for both the fill and drain plugs are 25NM.
     :002:

      +1

    I don't know of any other MC that doesn't have a drain & replace service interval for the FD gear oil.  It doesn't make sense to me not to.  And it only takes about 10 minutes to do the job every year or tire change.  I admit I'm big on PM .
    Last Edit: Dec 06, 2020, 01.15 pm by STJIM
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  • Offline darmah59   us

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    Offline darmah59

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    Re: Rear drive fluid replacement
    Reply #7 on: Dec 06, 2020, 01.25 pm
    Dec 06, 2020, 01.25 pm
    Study after study has shown that after a couple of hundred miles there is really no wear in a final drive, hence Triumph's recommendation. As long as there is fluid in the reservoir there is not issue. When was the last time you changed the diff fluid in your car? Unfortunately changing the fluid leads to risk of leaks, wrong fluid, etc. Over changing oil is perhaps not a bad thing, but always has a risk of some other issue and also a waste of resources and of course money.