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Thread: Transfer gear damage

  1. 31st March 2019, 06:15 PM #1
    steveG's Avatar
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    Transfer gear damage

    Found this damage on the input gear of my LT95 transfer (the output gear from the gearbox.

    No damage on the mating gear.
    I initially thought it must have had something go through it, but now thinking it's just the case hardening breaking down.

    Thoughts??



    Steve
    1985 County - Isuzu 4bd1 with HX30W turbo, LT95, 255/85-16 KM2's
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  2. 31st March 2019, 06:56 PM #2
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    JDNSW
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    I'd say something went through it - but if this were the case I would expect a similar (perhaps lesser) set of damaged teeth on the mating gear.

    I had a broken thrust washer go through the gears on my Series 2 transfer case many years ago, and it looked like that, as far as I remember.
    John

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  3. 31st March 2019, 10:34 PM #3
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    Case hardening breaking down for my 2-bobs. Especially if the mating gear isn't similarly damaged. Looks like it's done some work, that gear.
    DiscoClax
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  4. 1st April 2019, 05:37 AM #4
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    Quote Originally Posted by DiscoClax View Post
    Case hardening breaking down for my 2-bobs. Especially if the mating gear isn't similarly damaged. Looks like it's done some work, that gear.
    That was my thought too.
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  5. 1st April 2019, 10:30 AM #5
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    Thanks guys. Doing some research online myself last night, it looks its referred to as a spalling type of failure.

    Yes - I think its fair to say its done a lot of work! The gear came from a 1981 Isuzu Stage1 box. No idea of its history prior to me but its done ~100K km's of fairly hard work in my county behind the turbo'd Isuzu.
    Its done many hours towing with the engine at max EGT and I've regularly seen 100degC temps on a sensor at the back of the transfer case.

    The matching gear was a later one - part of an ex-army tapered roller intermediate shaft set.

    I've got another couple of gears here so will fit one of those.

    Steve
    1985 County - Isuzu 4bd1 with HX30W turbo, LT95, 255/85-16 KM2's
    1988 120 with rust and potential
    1999 300tdi 130 single cab - "stock as bro"
    2003 D2a Td5 - the boss's daily drive
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