Figure 4-8. Improper lining wear.

TM 10-3930-631-34

to remove tool marks, to prevent excessive lining wear

and to avoid runout when brakes are applied.

(d) Do not remove more than 0.050 inch (1.27 mm)

from a drum.

Replace drum requiring deeper

resurfacing. Maximum inside diameter after resurfacing

should not exceed 11.053 inches (280.74 mm).

(3) Check springs for cracks and brittleness. Upper

return spring (1, fig. 4-7) should have a free length of 7.5

inches (190.5 mm) inside hooks, initial tension should be

30 pounds and initial stretch 0.5 inch (12.7 mm). Lower

spring (2) should have a free length of 3.0625 (77.7 mm)

inside hooks, initial tension of 30 pounds and initial

stretch of 0.25 inch (6.35 mm). Replace unserviceable

springs.

(4) Inspect links (3) for cracks or damage. Replace

Figure 4-8. Improper lining wear.

links if necessary.

c. Installation. Refer to TM 10-3930-631-12 and

install wheel cylinders, brake assemblies and front

drums. Finish grind or hone drums

wheels.

4-11