TM 9-2320-361-34 15-38. BORING CASE MAINTENANCE (Contd) 13, 14. 15. 16. 17. 18. 19. Place dial indicator against rack feed idler gear (1) and measure backlash between rack feed idler gear (1) and rack feed spur pinion (2). NOTE If backlash is 0.006-0.016 in. (O. 15-0.41 mm), proceed to step 17. If backlash is outside limits, proceed to step 14. Remove bearing adjusting nut (11), roller bearing (12), rack feed idler gear (1), and roller bearing (5) from carrier (3). NOTE If dial indicator reading is not within limits, add or remove shims as required. Install or remove shims (4) as required, and install roller bearing (5), rack feed idler gear (1), roller bearing (12), and bearing adjusting nut (11) on rack carrier (3). Tighten bearing adjusting nut (11) until rack feed idler gear (1) has no in and out play, then back off bearing adjusting nut (11) 1/8 turn. Perform step 13. Install new lockwasher (10) and bearing adjusting nut (9) on carrier (3). Tighten bearing adjusting nut (9) and bend tabs of new lockwasher (10) against bearing adjusting nuts (11) and (9). Install sleeve spacer (8) on rack carrier (3). NOTE For step 19, shim must be same thickness as recorded during removal. Pack roller bearing (6) with GAA grease and install new shims (7) and roller bearing (6) on carrier (3). 15-138