This is the brake adjustment procedure as called out in TM9-2320-209-20-3-2 and others. Here’s a quick summary:
1) Remove the wheel(s)
2) Remove the drum inspection slot cover
3) Turn the drum so the inspection slot is to 8 o'clock, adjust the bottom right anchor pin CW\CCW till you see .010 inch clearance
4) Turn the drum so the inspection slot is to 11 o'clock, adjust the top right anchor pin CW till you see .020 inch clearance
5) Turn the drum so the inspection slot is to 5 o'clock, adjust the bottom left anchor pin CW\CCW till you see .010 inch clearance
6) Turn the drum so the inspection slot is to 1 o'clock, adjust the top left anchor pin CCW till you see .020 inch clearance
7) Reinstall the drum inspection cover
8) Turn the top left cam stud CCW until you feel a slight drag & back off a tad
9) Turn the top right cam stud CW until you feel a slight drag & back off a tad
10) Reinstall the wheel(s)
After you are back on the road or doing a minor adjustment, you only need to adjust the top eccentrics:
1) Jack up the axle to be adjusted, both sides
2) Turn the wheel to listen for drag as you do steps 3 & 4, the opposing wheel will turn the opposite direction
3) Turn the top left cam stud CCW until you feel a slight drag & back off a tad
4) Turn the top right cam stud CW until you feel a slight drag & back off a tad
5) Repeat 3 & 4 as necessary, adjusting to feel
6) Lower the axle
Be Safe and ALWAYS use wheel chocks and jack stands! I used two sets of jack stands to be extra careful.