samba - Oct 2007 - ad query using machine account credentials?

I need some ldap - AD queries from a linux client, which is member of 
the respective domain.
This work fine, when the user on that linux client has gotten a kerberos 
ticket .
As in that domain the passwords do frequently change, I would like to 
use the credentials of the machine account
of that box to be the originator of that AD query.
Is this possible?  How would I get a kerberos  ticket for  the machine 
account.
Thanks
Norbert