TM 9-2320-209-34-2-2 FRAME 10 1. 2. 3. 4. Working through boring case inspection hole (1), mount dial indicator on housing and set stem against side of rack feed idler gear tooth (2) as shown. NOTE When measuring backlash, make sure second reduction feed pinion (3) does not turn. If pinion turns, back- lash readings will be wrong. Turn idler gear (4) away from dial indicator until idler gear tooth (5) touches pinion tooth (6) as shown in view A. Set dial indicator to read 0. Turn idler gear (4) toward dial indicator until idler gear tooth (7) touches other side of pinion tooth (6) as shown in view B. Note reading on dial indicator. IF READING ON DIAL INDICATOR IS NOT BETWEEN .011 INCH TO .034 INCH, GO TO FRAME 11. IF READING ON DIAL INDICATOR IS BETWEEN .011 INCH to .034 INCH, GO TO FRAME 12 17-523