From old occupations on the Internet, a Raker could also be a street cleaner.
In my family between 1750 and 1850 the first generation was a mariner. The second and third were labourers and then both were mariners. I thought it strange until I found the deaths of each. When one died, the next generation used the boat and became a mariner, and that happened again to his son-in-law. In your family there may have been an opportunity to change career. It could also be he wife's family who had the farm. In those days they could do many jobs, so changing occuption was not an issue.