Stal Mini R59K

Hi Everybody,

We have 1995 model Stal mini R59K. Aprox. Every two months the compressor locked and the system has given the overloaded fault. When we dissambled the compressor we have seen the bearings were damaged and we considered there was a problem about oil system. We maintained the oil pumps and system, and we run, after two months same problem occurs and the oil pressure that the pressure cage show was 5 bar. Is there any experince about this situation and english manual of R59K?

Thanks...