Iwaki pump motor hosing is made of full metal. If the housing is left to vibrate on a hard flooring or surface, that's explain the loud noise.
You can sit the pump on a piece of heavy duty ruuber mat or simply a mouse pad to absord the metal vibration.
As for the fan noise, after long usage, the fan will tends to make noise due to dust and blockage of the vent. You need to clean them to increase air flow and reduce the air noise.
Iwaki MD-70RLT draws 210watt and output 5160 Litres/hr at head of 4.0 ft.
Iwaki MX-70M draws 250watt and output 5400 Litres/hr at head of 4.7 ft. MX series is suppose to take over MD series, where the later will be phasing out soon.