Simple editing images to remove background and convert to PNG

I need someone who can work fast in removing background from photos to have clear transparent background around isolated machine graphic and ensure the machine stay intact in the photos. There are 2 machine folders: - one folder contains 44 photos - another folder contains 33 photos The measurements of edited photos with transparent background and isolated machine displayed intact are: - 800 x 800 pixels - PNG format - 1920 x 1920 pixels - PNG format These new files must be supplied in zip format, can be uploaded to dropbox or google drive then provide links. The purpose of job is to clean up the photos to remove distracting background to ensure a clean isolation of product ready to make 360 degrees view photo interactive media. / animation. Urgent job done in 24 hours required.