SUN station memory problem

The problem is that I use this station as a remote computer for an AOI Orbotech machine and in the root of the station there is no memory available and on the refmgr folder on the same station there are 5GB free memory. So if anyone knows how can I free some space and not damaging the root files, please help because the machine needs this computer to work regulary. Thanks in advance. Regards from Macedonia.