Replace the internal and external oil filters. A high pressure drop across the filter starves the compressor bearings of oil.
: Start the compressor and monitor the suction, discharge, and oil pressures immediately. Verify that the slide valve loads and unloads smoothly across its full operating range. mcquay hsa screw compressor service manual
Typically ranges from 100% down to 25% (or 10% on variable frequency drive models). Replace the internal and external oil filters
