Is the noise coming from the motor or the pump? From what I can gather, the pump is a Procon Model# 111A100F11AA. It does not come with a motor. You have to attach one separately. Are you operating it above 150F? That's it's upper limit.
•Carbonator-Mount Rotary Vane Pumps
•These positive displacement pumps run quietly, have low vibration and pulsation characteristics, and are virtually maintenance-free. They can handle many liquids with low lubricating characteristics at relatively high pressures. Flow remains constant over entire pressure range. Most models are self-priming (except 6XE92 and 6XE95). Metal-to-metal contact is eliminated, resulting in low starting torque. 303 stainless steel shaft, stainless steel rotors, and built-in relief valve. Pumps mount on NEMA 56C frame motors (adapter kit sold separately) for a coupling drive, or can be attached to a NEMA 48YZ motor with a V-band clamp. High-temperature plastic internal bypass valve eliminates the need for an external relief valve on all models except 6XE92 and 6XE95. (6XE82 and 6XE84 have internal solid-brass bypass valves. Brass and stainless steel also available on all other models; call your local branch. ) For pumping water and moderately aggressive liquids, carbonated water for beverage dispensers, ultra-filtration, deionized water, reverse osmosis systems, espresso coffee machines, lubrication spraying, insecticide spraying, soap dispensing, distilled water, fire-resistant fluids, hydraulic oil, steam cleaning machines with clean water, cooling circulation, pressure booster, atomizing/misting humidification systems, laboratory pumps, pilot plants, boiler feeds, textile machines, car wash machines, water purification, and fire jockey pumps.
•Max. operating pressure: 200 psi
•Max. fluid temperature: 150°F
•Relief valves preset to 250 psi
•All pumps NSF rated, except 6XE82 and 6EX84
•This item has been restricted from sale in the following states: [CA, VT]
•California Proposition 65 Warning: This product contains a chemical known to the State of California to cause birth defects or other reproductive harm.
Rotary Vane Pump, Inlet/Outlet NPTF 3/8 In, 100 GPH, Relief Pressure Max 250 PSI, Brass Construction, With Filter Strainer, External Relief Not Required, By-Pass, Carbonator Clamp Style Mounting, 100 Mesh Filter, Max Temp 150 F, Built-In Relief Valve, Relief Valve PSI Setting 200, 303 Stainless Steel Shaft, GPH @ 50 PSI 102, @ 150 PSI 98, HP @ 50 PSI 1/4, @ 150 PSI 1/3, Min Flow 94 GPH, Max Flow 112 GPH