Points well-taken, which are the most common issues within industry. They look thrashed but the tools
have been basically taken care of, just heavily used, ha. Most of what you see are older machines,
(obsolete A, B and C versions of the 5540) which are around 10-plus years old and used all the time.
Machines are blown out daily when they were working, (and unplugged overnight,) but on their last
run they get no cleaning just handed to me for the fix.
I have a Milwaukee at home which only I use, and it is at least 20 years old and pristine, so our workers
do not have the same stake in my tools as I do, ha ha. (But they use them all day long too…)
It’s up to me to do things like switch and brush maintenance. I’ve become pretty good at fixing the guts of
that pesky switch. If it wasn’t for that, the 5540 and 6078 would be great machines. The 9227 has that
darn delay at spool up. Otherwise a great sander because they are light in weight, my Sanders are
young so the 13 pounds doesn’t bug them. They decide if they want to put tape on the “eye side” and
I agree you’re right, do not want backflow which glazes the brushes and possibly overheats. At least the
tape is not completely covering the vent, just diverting forward which also clears seeing the disc a little.
Once I see an armature drop I know it costs too much (my time and $) to change out parts, so I get a new
one, then that one becomes cannibalized. I just ordered more parts today, turns out there are no complete
5540’s immediately available in local stores. I’ll keep at least three of them going with the parts coming…
I want to say that I’ve tried many other brands, one of our guys even went the Harbor Freight route (and
bought the warranty) but eventually gave up after his 5th exchange, plus they said they would not totally
replace his machine after the 3rd one so he paid partially for the last 2.
Hitaci had a great sander/polisher which is excellent for shaping, the lightest tool of its’ kind, but the
switch is too sensitive to dust. I still have two of those machines, almost new looking still, (but shaping
only.)
Another brand that works okay is the DeWalt, but the action is not as nice for rail work as the Milwaukee.
I should note the switches last a lot longer if the machines are unplugged when not in use… …the switch
has dual high tension contacts a bit like the points in a distributor of an older car, they can fry if left alone.
George