TM 5-4220-225-14
5-7.
Lower Breech Ring.
This task covers:
Repair
INITIAL SETUP:
Tools
Materials/Parts
3/32-inch Hex Wrench (Item 22, Appendix B)
Lower Lug
0-50 lb-in. Torque Wrench (Item 19, Appendix B)
Halocarbon Grease 25-55 (Item 10, Appendix E)
Adapter, Socket Wrench (Item 41, Appendix B)
RTV Sealant (Item 1, Appendix E)
Hex Insert (Item 55, Appendix B)
Lower Breech Ring Retainer
9/64-inch Hex Wrench (Item 22, Appendix B).
Neck Dam
Jocking Harness Bracket
Repair.
(1)
Replace (lowerlug). (figure 5-1)
(a)
Remove two screws (1) and lower lug (2).
(b)
Apply a thin coat of lubricant to lower lug surface that contacts lower breech ring (3).
(c)
Apply a thin coat of sealant to threads on screws (1).
(d)
Install lower lug (2) and thread two screws (1) fingertight.
(e)
Install lower breech ring (3) on helmet (4) (slide quick release pins into loaded position).
(f)
Tighten lug screws (1) evenly and torque screws (1) to 18-20 in.-lb (2.1-2.3 Nm).
(g)
Work both quick release pins to ensure they do not bind.
5-6
