Although I haven't pulled one apart, I believe the Bontrager Race Lite Tandem wheels uses a DT/Swiss hub. The star ratchet mechanism is very easy to service and should be cleaned and lubed every now and again, but does require the use of a very lightweight lubricant. Here are some links to servicing instructions:
http://www.dtswiss-us.com/hubmaintenance.htm
The complete manual for the DT line of hubs that address bearing service, including the 540 tandem hubs, can be found here:
http://www.dtswiss.com/getdoc/4e78ad...Datasheet.aspx