When you put in the spray tips of a surface cleaner the tips line needs to run the same way as the bar. The line that on the tip should run adjacent w spray arm bar.
You should have a white plastic card that you use to set the angle of the spray bars, if you do not have it call where you bought it from and have them send you one.
The wrong angle will not spin fast enough and blast the concrete too hard and the other wrong angle will make the bars spin too fast and barely clean anything.
I actually got a template of the gauge emailed to me .The real deal plastic is in the mail .
The thing is when i pre set them by eye ball ,they were darn close the the template i cut out .
physics i guess works the best ,lol.