Leaking steering box

[Jojo]

G'day all!
The steering box on the 110 now loses more than a few drops of ATF. On full lock there is a steady stream running from apparently above the drop arm joint. To be honest, I have been topping up the reservoir every now and then over the last two years or so, but never been able to localise a leak. Until now, that is.
Anyone of you with an idea about what the cause of the problem is? (Faulty seal, of course, but where???) Can it be repaired in situ or does I have the steering box have to cone off (big bother). Any other advice? Short term fix possible (at least until the weather is getting warmer, no fun working on the vehicle in knee deep snow and -20°C)?
Cheers

[AK83]

easy to do in situ, unless you have an aversion too working whilst lying down.

only hard part is getting drop arm off.

if you are unsure, plenty of tutorials on the net to help.

[POD]

What year is your 110? I don't know when they were improved, but the early boxes were a bugger for leaking, replacing the seal was a complete waste of time. The sector shaft ran in a bush, the shaft would wear and slop around, even replacing the bush did not solve the problem because of the wear on the shaft, a new seal would be leaking again before you could drive around the block. Later boxes I believe have a roller bearing on the sector shaft so don't suffer from this problem.

[p38arover]

I replaced the seal with a revised seal on my '86 RRC (same box I believe). I had to hire an hydraulic puller and, even with it, getting the droparm off was exceptionally difficult. I thought I was going to break the puller.

[Jojo]

Thanks for all replies! Will attempt to replace the seal as soon as the weather allows (and I have found a seal kit). Anyone having advice for stop gap measures in the meantime (apart from topping off regularly)? I have filled up with stop-leak and will see if it makes any difference.
The truck is MY'86 originally but I have replaced the pump about 15 years ago with one from a Discovery, so it should be from the early/mid 90's.