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TM 5-2420-222-34
10-4.
HYDRAULIC BRAKE CYLINDER MAINTENANCE (Con’t).
5.
Using combination square, measure free length of piston springs. Free length must be 7.5 in. (190.5 mm).
6.
Using spring tester, torque wrench, and combination square, compress piston springs to 5.75 in. (146.05 mm). It
should require 20 lb.-ft. (27 N•m) to compress springs.
7.
Using vernier calipers, measure free length of springs (21). Free length must be 0.797 in. (20.244 mm).
8.
Using portable spring resiliency tester, torque wrench, and combination square, compress springs (21) to 0.281 in.
(7.144 mm). It should require 1.8 lb.-in. (0.2 N•m) to compress springs.
d.
REPAIR
Restore damaged threads using screw threading or pipe threading set.
TA701470
10-23
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