Never read in the first place. But when you need them, you cannot find them: manuals. Here is a quick guide how to find manuals of spray guns, diaphragm pumps and other spray finishing equipment online.
This is the first thing that comes to mind. And here is a simple search query you can use in pretty much any search engine:
“brand” “model” manual pdf
e.g. Binks Mach1 manual pdf
“manual” is the most common term in this context. But depending on geographic location and company policy, the manual can be given a different name. So you can replace the term “manual” by one of the key words in blue stated below:
customer product manual
operating instructions manual
instructions parts list
There are some websites dedicated to manuals and pdf documents. The most relevant ones for spray guns and spray finishing equipment are:
(very good resource)
Each of these websites has a search function where you can input your brand and model.