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The Government requests a one-time service to rebuild the Russ-Beach Rotary Pump OC# OC4141 Model#750RPM900A listed on the Appendix A. Vacuum pump must be returned to the following operational capabil... The Government requests a one-time service to rebuild the Russ-Beach Rotary Pump OC# OC4141 Model#750RPM900A listed on the Appendix A. Vacuum pump must be returned to the following operational capability: Pump displacement: At least 750 CFM at 200 rpm. Ultimate vacuum: 1 Torr (abs) or less Time to pump down a volume of 1900 cubic feet from prevailing atmospheric to 8.36 mmHg: 16 minutes Warranty for aforementioned performance characteristics must be at least one year from time of reception of equipment by customer Contractor must have tungsten carbide thermal spray capability. Rotating Element Repair damage to bearing and seal surfaces on shaft of rotating element utilizing tungsten carbide thermal spray. Build up and machine keyway utilizing tungsten carbide thermal spray. All tungsten carbide additive must have a final hardness of at least 78 Rockwell. Cast weld and machine multiple cracks on gate Build up and machine to repair damaged corner of gate. Pump Heads Cast weld and machine surface to repair cracks on front and rear pump heads Replace front and rear ring bearing sleeves Replace front and rear sleeve bushings Cylinder Inspect cylinder bore for deformation including surface irregularities, and geometry including ellipsing Build up and return to serviceable condition Valve Body Manufacture and replace valve studs and disks as needed Rocker Seals & Springs Manufacture and replace springs & seals as needed Ensure the rocker arms produce an adequate seal, rebuild if necessary Maintain OEM Clearances See the Performance Work Statement and Technical Requirement documents for the complete list of rebuild requirements.