Timer job is not running on all servers in 2007 MOSS Farm

We have shifted our MOSS 2007 Solution from one Server machine to another server machine. On old server after deploying corresponding .wsp file, our custom timer job runs on all 3 servers sess1, sess2 and sess3 in the MOSS 2007 Farm. But When we have shifted our solution to new Server machine and deployed the same .wsp solution file, the same timer job only runs on one server sessNew1 where SharePoint central admin is installed.On other two servers, job is not showing. The other two servers sessNew2 and sessNew3 with that timer job are not showing under timer job status.

Any idea, what is wrong?