We have a 25hp Travaini LRVP that has become a bit of a bear to fix. It started generating a rattling noise once the oil heats up and at certain vacuum pressures. When dead headed, the rattling dissipates. After speaking to Travaini US, they suggested that we replace the bearings on the pump. We did and the noise remained. We then thought that perhaps after many years of operation in a wood shop that the heat exchanger / radiator had become restricted due to build up. We replaced it with new, yet the rattling remained. We then changed the nose bearing (the bearing that sets the vanes to center in the pump housing) to a standard bearing that has a tighter tolerance than the C3. Our thoughts were that the C3 would allow for too much lateral movement. We checked the side to side clearance and found it to be in spec with the manufacturers specifications. The rattling remains. Include also, the mechanical seals were changed at bearing replacement and an oil change with the Travaini brand. This has become a major mystery. There just is not a lot of moving parts in this machine yet eliminating the noise is beyond perplexing. Has anyone else had this same problem?