AFAIK, the rear diff is engaged electronically. The oil should be changed regularly - every 30k or if the diff starts to squeal when turning tight corners. Apparently, it's not as easy a job as it sounds..... apparently! (According to a Honda loving mechanic)
Having spent time researching these before buying, I believe the dual pump system is entirely mechanical. It's just two propellors that engage the rear diff clutches when a difference between front and rear wheel speeds causes them to engage.
The more recent models are not purely mechanical, I was recently seriously interested in a new or nearly new one and there is electronics involved because there was a software problem which caused the 4wd system to revert to 2wd to prevent the rear diff from overheating or overloading.
Because of the total nonsense on this subject emanating from Honda UK I didn't buy one in the end.
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