The manuals are almost as varied as the reels themselves.
Most were provided with reels, but they varied in the quality of details provided over time.
The Pimple reels were not produced with manuals as they were so simple to maintain, but they did have a supply of all spare parts available.
Some manuals produced in recent decades did not have the pictorial detail and step by step servicing instructions of the early years from 40/70's .
All usually had a schematic diagram, absolutely essential before the internet times, now they can be freely and easily downloaded if lost. Some people also sell CD's with many schematics.
The number available preclude me showing all here.
My most recent Pure Fishing Spinning reel acquired (I have now bought the Soron 20, 40, 60, 70) to actually fish with (based on the good service given by the big brother size 60) is the deminutive ABU Soron STX 20Samples of various reel type manuals. much older, first.
Record Casting Reels
Ambassadeur Casting Reels
The famous close-face spinning reels from
Series Close-Face reels
ABU 12/20/30 IGFA Trolling/Jigging Reels
Record Fly reels
I have 4 of this very reliable series of reels that I use in Salt water. The 60 has landed a very tough 26 kg GT over 30 minutes on 30lb mono.