Yes, check all adjustments FIRST; else, your pressure test results may be in error.
In addition to the shop manual, you should review
SC Vol. 27, No. 2 (starting pg. 7), which covers the latest updates relative to linkage adjustment for 23rd-26th Series and is nicely illustrated.
This is also covered in
SSB No. 340 (starting pg. 5) for 23rd-54th (exc Gear Start), but wth a revised (one-size-fits-all) version of the special adjusting gauge. This document also includes relative dimensions for the checking throttle control rod
(see pg. 7).
Last but not least, see this
thread for an alternate approach to for the special adjusting gauge - with "a tip o' the hat" to
HH56. (Click on his attached JPG image to enlarge.)
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