TM 9-4310-397-14
(5)
Measure timing gear backlash.
Figure 6-41. Gear Backlash
(a)
Measure backlash between gears. Specifications of backlash of new parts is as follows:
1
Gear (Figure 6-41, A): 0.003 - 0.014 in. (0.07 - 0.35 mm).
2
Gear (B): 0.003 - 0.014 in. (0.07 - 0.35 mm).
3
Gear (C): 0.003 - 0.012 in. (0.07 - 0.30 mm).
4
Gear (D): 0.003 - 0.014 in. (0.07 - 0.35 mm).
5
Gear (E): 0.002 - 0.014 in. (0.05 - 0.36 mm).
(b)
If backlash is not correct, install new gears.
(6)
Measure idler gear end play with a dial indicator (Figure 6-42). Check end play of upper and lower idler
gears.
(a)
End play should read 0.001 - 0.007 in. (0.02 - 0.17 mm).
(b)
Maximum wear tolerance is 0.015 in. (0.26 mm).
6-41
