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From a post on the Honda Karma website for this model:
the CR-V has dual hydraulic pump center/rear differential and 4WD transfer case.
The pump is constantly measuring the pressure and when the sensors pick up a difference greater than 3% between the two pumps it engages . The CR-V has clutch that connects the front and rear axles that kicks in to engage four wheel drive.
http://hondakarma.com/threads/is-my-cr-v-4x4.1781
In the review of this model on this HJ site, under the "What to watch out for" section it says
As with previous model, the oil in the 4WD rear differential dual pump clutch is known to degrade prematurely, well before the recommended replacement interval. Symptoms are a moaning/groaning noise when manoeuvering on full lock. This is easily misdiagnosed as a steering rack problem, which may lead to uneccessary repairs. The solution is to simply replace the dual pump fluid with the latest spec Honda fluid which is called Dual Pump 2 fluid.
I had a later model CR-V and the Owners Manual recommended periodically swapping the front and rear wheels to equalise tyre wear so that the 4WD system didn't engage unnecessarily.
Edited by RichT54 on 28/04/2014 at 13:01
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