CHAPTER 9: MAINTENANCE OF HULL- AND CAB-RELATED COMPONENTS TM 9-2350-256-209-40 REPLACE PERISCOPE QUICK-RELEASE MOUNT (INFRARED NIGHT VIEWER)THIS TASK COVERSa.Removalb. InstallationINITIAL SET-UPTools:Parts:Tool kit, general mechanic's (Appendix C, item 53)Lockwashers (4) (Appendix G, item 125)a.REMOVALRemove mount (1) by removing four screws (2), fourlockwashers (3), and four nuts (4).b.INSTALLATIONInstall mount (1) with four nuts (4), four new lockwashers(3), and four screws (2).9-41 REPLACE DRIVER'S AND RIGGER'S PERISCOPE BLOCKS AND VISION PRISMSTHIS TASK COVERSa.Removalb. InstallationINITIAL SET-UPTools:Material/Parts:•Tool kit, general mechanic's (Appendix C,•Compound, sealing (Appendix D, item 27)item 53)•Lockwires (2) (Appendix G, item 154)•Socket set (Appendix C, item 49)•Seals (2) (Appendix G, item 251)•Wrench, torque (Appendix C, item 62)NOTE•Removal and installation procedures are the same for both driver's and rigger's periscope blocks andvision prisms. Driver's side shown.•Steps 1 and 2 apply only to periscope blocks. Proceed to step 3 for vision prism removal.a.REMOVAL1Loosen four wingnuts (1) and release periscopes by turning retainers (2) 1/2 turn. Pull three periscope blocks (3) out of openings.2Remove four wingnuts (1), four flat washers (4), four retainers (2), and four studs (5).9-66
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