A tip on how to install yum in RHEL 4
January 4, 2008 by Clair Ching
Filed under Links, The Free World.
PinoyTux has a guide on installing YUM on RHEL4. She got the idea from a blog entry about installing yum in RHEL3.
In any case, for those newbies who are wondering if there’s a way to install yum, I hope that this link helps! After all, you might want to use yum rather than up2date anyway.
I think that new Linux users who are encountering Red Hat related problems could learn some stuff from PinoyTux. 
It would prove to be one nice resource of tips too!
I want to install yum in RHEL4
go to this site http://linux.softpedia.com/get/Utilities/Yum-2656.shtml and download the yum package and then put it in the server’s var filesystem where u need to be installed. then unpackage it(if such) and start its’s service.