re: checking inside transfer box
I'd rather not get into telling people what to do, however:
I've been advised that faults with these transfer boxes are rare, usually caused by bad maintenance, such as not checking the oil level
In my case a previous owner had the transfer box rebuilt by some "experts"
who have a lot to answer for...
To get to the offending pump, you'd need to remove the transfer box from the van, (I unbolted mine from the back of the gearbox in situ), then strip it down on the bench, the bracket is a small folded steel item, which in theory can be ordered from your local dealer
My advice is:
Don't try this at home, unless you've got experience rebuilding gearboxes.
Having seen the mess that was inside mine, make sure yours is filled with the right type and quantity of nice clean oil.
The workshop manuals for the 4x4 daily are available on ebay