TM 9-2320-209-34-2-1 FRAME 17 1. Paint 2. Turn NOTE Gears that are not put back in matched sets generally are noisy at first. After new gear and mating old gear have been run in, noise usually disappears. teeth of bevel pinion gear (1) with red lead or Prussian blue. gears (1 and 2) and note contact marks. Pattern A shows correct tooth contact. IF GEAR TOOTH SHOWS PATTERN B, C, D or E, GO TO FRAME 18. IF GEAR TOOTH SHOWS PATTERN A, GO TO FRAME 19 10-85