I believe this started as a TV movie (circa 1980's) and segued into a short-lived series.
The protagonist was a retired gentleman who took up lost causes from people who could not afford outside help. The principal actor reminds me of Michael Caine but I've checked that BIO backwards and forwards and it is not him. If there was an original TV movie, the principal character was a retired machinist¹. I don't use the term 'gentleman' lightly; the principal character could be considered the embodiment of a modern-day 'knight of the round table'.
I've done my own research on this but I keep getting caught up on the fact that I remember the original title as the 'The Expeditor' (which is wrong). It may be something similar or I could be completely off-track.
¹ After some more research fueled by swstephe's answer, I believe my tiny little brain had mashed up the Equalizer series with a 1988 TV movie called The Child Saver starring Martin Balsam who played a retired machinist in a simlar role. Don't do drugs kids.