TM 9-2520-246-34-1 b. Backlash Check. 1. 2. 3. 4. 5. NOTE This frame tells how to check backlash for all gears. Do this frame when measuring backlash for each set of gears in frames 2 and 3. Mount dial indicator on housing and set stem against side of gear tooth (1) as shown. NOTE When measuring backlash make sure that gear (2) does not turn. If gear turns, backlash readings will be wrong. Turn gear (3) away from dial indicator until gear tooth (4) touches gear tooth (5) as shown in view A. Set dial indicator to O. Turn gear (3) towards dial indicator until gear tooth (6) touches other side of gear tooth (5) as shown in view B. Check that dial indicator readings are within wear limits given for each set of gears. — GO TO FRAME 2 TA 087801 2-3