Thread: RRC gearbox LT95 what's the hose tap for?

Originally Posted by isuzu110

Isn't that the filler plug it is tapped into ? If so, I agree it could be a bypass hose to the transfer case because the intermediate seal between the gearbox and the transfer case is stuffed and oil is pumping one way and overfilling one of the two.

As another option, someone may have had a hose on it to make it easier to fill the gearbox as it's not the easiest filler to get to.

That used to be a common bodge to stop the gearbox (IIRC) pumping all its oil into the transfer (or vice versa) when one overfilled it would drain back to the other through the 'balance' pipe.

Maybe problem was solved and half removed or replaced.

Martyn

It's actually simpler than that..

Just fill the gearbox and transfer up level to the filler plugs. After a few thousand k's, let the box cool and undo the filler (not drain) plugs. If a lot of oil comes out of one filler, see how much oil the other filler needs to top back up.

I used to see my transfer case overfill as the oil pumped from the gearbox into the transfer. Had a two seals fitted back to back between the transfer and gearbox to stop this when the box was overhauled.