CHAPTER 9: MAINTENANCE OF HULL- AND CAB-RELATED COMPONENTS TM 9-2350-256-209-41 REPLACE DRIVER'S AND RIGGER'S PERISCOPE BLOCKS AND VISION PRISMS— Continued7Remove lockwire (12).8Remove two bolts (13).NOTEBolt (13) placed in center hole (14) of wedgeplate (15) will act as a jacking screw.9Place bolt (13) in center hole (14) of wedge plate (15). Turn clockwise until wedge plate and vision prism (16) are removed from hull.10 Remove seal (17) and all remaining sealing compound from vision prism (16).b.INSTALLATIONNOTE•Steps 1 through 4 apply to basic design vision prism; steps 5 through 7 apply to later design.•Proceed to steps 8 and 9 for periscope block installation.1Apply sealing compound to vision prism (9) and install new seal (11). Remove excess sealing compound.2Install vision prism (9) and wedge plate (8) with screw (10) in center hole.3Install two screws (7) in wedge plate (8). Torque to 84-120 lb-in. (9.5-13.6 N•m).4Secure three screws (7 and 10) with new lockwire (6).5Apply sealing compound between vision prism (16), hull opening, and seal (17).6Install vision prism (16) and wedge plate (15) with two bolts (13). Torque bolts to 84-120 lb-in. (9.5-13.6 N•m).7Secure two bolts (13) with new lockwire (12).9-68
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