301 Redirection of New Website Structure – NEED ASSISTANCE ASAP

I have changed complete my website and that’s why url structure also updated. On that time I have redirect approx 100 old site urls to new site urls for taking benefit of page rank….Now our new urls has been getting good page rank…
So can I remove redirection from old urls to new urls and removed old website urls from search engine indexing…
Too much 301 redirection is harmful or not?
Please suggest me on this asap.

See original post by crystaltechonline