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Thread: URGENT - how hot is too hot for an LT95?

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    URGENT - how hot is too hot for an LT95?

    Sorry to post this here, but I need an answer quickly. What sort of temperatures would be considered too hot for an LT95 gearbox? I am towing a trailer that is about 1 tonne all in, and have a fair bit in the back of the 101 as well. The actual gearbox body temp is 78 degrees, but the area where the output shafts are is at 98. The overdrive has just topped 100. I have been checking the temps regularly since leaving home this morning, and they have been steadily rising, but I have been climbing up the Hume from Melbourne, which is mostly uphill. I've stopped for a while now at the Maccas just North of Glenrowan to let everything cool down, but I'm not sure if I should press on...

    Oh, the box is running the same oil as the engine and it has plenty in there - Castrol 20W50.

    Help and advise would be appreciated.

    Cheers - Gav.
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    Slow down a bit everything is stacked against the box and the 20/50 is too thick avoid using the overdrive where possible.

    You also need to check the oil levels a low thick oil level is a disaster waiting to happen.

    Via the modern day equivalent to smoke signals fromsome place other than the cave where my hat hangs.

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    I have rung blknight, he will be along shortly.....

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    Keep us up to date Gav, there are quite a few members between where youe and Sydney if you need a hand.

    If worse comes to worse one of us can come and pick your camper up if you need some load taken off.

    I think you may need to drop that oil out and put something more suitable as Dave seems to think it's too thick.

    A bonus is that it's pretty flat right through Gundagai from Glenrowan.

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    Quote Originally Posted by Blknight.aus View Post
    Slow down a bit everything is stacked against the box and the 20/50 is too thick avoid using the overdrive where possible.

    You also need to check the oil levels a low thick oil level is a disaster waiting to happen.

    Via the modern day equivalent to smoke signals fromsome place other than the cave where my hat hangs.

    Feel freeto get my number fromthe hats if you need it.

    I think Dave ment to say the ho har's

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    This might be a dumb question. But how does a manual gearbox generate heat at all. The gears should all be in constant mesh, and there is no torque converter pump/slipping to generate heat.

    Unless of course it has a failing bearing running red hot .....

    You know it maybe quite normal. After all I've never heard of anyone having the capability of reading transmission tempertures. It is however bolted to something that runs at about 95degrees. So I'm not surprised the gearbox oil/gearbox eventually ends up at the same temperature as the engine it's bolted too.

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    Quote Originally Posted by Blknight.aus View Post
    Slow down a bit everything is stacked against the box and the 20/50 is too thick avoid using the overdrive where possible.
    I agree with not using the overdrive when towing but why do you think the oil is too heavy? The overdrive should not be used in high load conditions - hills/towing etc.

    I have always used engine oil (as is advised in all the documentation) and have used my 101 in plenty high load conditions and towed my Jayco campervan over long distances in hilly conditions - all OK.

    I do change my oil every few thousand km (basically because my 101 does not get a lot of use) and the oil has always come out looking good and not being overworked.

    I certainly would not go any heavier oil and maybe one grade lower but the oil should be OK.

    Is the handbrake dragging putting heat into the system?

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    Thanks for you quick replies guys, I really appreciate it.

    It's a bit hard for anyone to call me, as I can't hear **** while driving..

    Apart from your replies, I also 'Phoned a friend' - thanks Justin for taking my call.

    Ok, overdrive is now disengaged, and I've slowed down to 85 ish. Been pulling up every 30 or so KM to check temps and they have settled down a lot. Now I'm only getting mid 80's from the TC, and the overdrive is the same, so I guess a combination of speed, big hills, and the overdrive were pushing the temps up.

    I'm now well clear of Albury about 120 clicks out of Gundagai which is around the place I tend to pull stumps for the night.

    I'll check back here and let you all know how I'm travelling. A lot happier now, I was starting to think I'd have to head home, but I'm confident to push on now.

    What oil should I be running in the gearbox anyway? I though engine oil was correct?

    I am happy to drain it and refill it if need be.

    Cheers - Gav.
    If you need to contact me please email homestarrunnerau@gmail.com - thanks - Gav.

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    Quote Originally Posted by garrycol View Post
    Is the handbrake dragging putting heat into the system?

    Garry
    No, checked that - all good there thanks.
    If you need to contact me please email homestarrunnerau@gmail.com - thanks - Gav.

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    Quote Originally Posted by garrycol View Post
    ...

    I have always used engine oil (as is advised in all the documentation) and have used my 101 in plenty high load conditions and towed my Jayco campervan over long distances in hilly conditions - all OK.

    I do change my oil every few thousand km (basically because my 101 does not get a lot of use) and the oil has always come out looking good and not being overworked.

    ...

    The world (and lubrication technology) has moved on since the documentation was written. However LT95s are sufficiently over engineered to cope with most oils.

    If you are changing it every few thousand km the I sure hope it wouldn't discolour!!!

    However there are much better (gear) oil options - especially given parts and rebuild cost for an LT95 is probably only increasing???

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