TM 9-2320-209-34-2-1 FRAME 26 1. Move dial indicator (1) so ball end is against a tooth of helical drive gear (2). 2. Hold spur gear pinion (3) to keep it from turning. 3. Rock helical drive gear (2) back and forth. Reading on dial indicator (1) should be between 0.007 and 0.014 inch. 4. Take off dial indicator (1). GO TO FRAME 27 10-94