Hi,
Im affraid you are correct. Time to pull the box.
I have made a cradle from some 12mm flat plate and some pieces of old box section that sits on my trolley jack to aid removal and replacement, just helps if im on my own in the workshop.
Its also a good idea to reverse the machine onto some wooden blocks/planks under each wheel just to give you some more room under the machine and so you have enough height to wheel the gearbox out from under the machine on the trolley jack. I remove the offside front wheel and drag the box out that way.
Well Newty, this will be a first for me. I'm used to doing a bit of work on cars, motorbikes and even rallye-prepare Paris Dakar bikes in the past but never worked on big plant. So here goes!!!
I'm a carpenter amongst other things so I'll probably make some form of support out of timber I have here on site. Have you any idea of weight, 2-300kgs I'd guess. The only other thing, for the minute , is should I raise the main lifting arm so I can get at the top part of the box easier?