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SIGHTS
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TM-750-116 Topographic Support System (TSS) Downsized Direct Support Section (DDSS) Manual
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Figure  3-51  Night  Sight  Cover  Actuator Handle/Support
TM  750-116 (d) Perform purging and charging procedure para 2-5.b. (e) Remove outlet port screw and discard. (f) Purge instrument at 4 psig for 10 minutes or until all visible traces of moisture are gone. (g) Apply thin coat of lubricant (item 3, appx B) to o-ring of replacement outlet port screw and install. (h) Torque  outlet  port  screw  to  24-28  in-lb  (28-32 cm kg). (i) Charge instrument at 4 psig for 10 minutes. (j) Leak test instrument for minimum of 10 minutes. If leak is detected, repair per table 3-1. Table  3-1  Leak  Test,  Integrated  Sight  Unit Part leak de- tected  from lamp  window collar assembly lampholder  as- sembly  cover valve  assembly all other parts of ISU Manual re- ferred for M2, M3, M2A1, and M3A1  vehicles TM9-2350-252- 20-2-3 TM9-2350-252- 20-2-3 TM9-2350-252- 20-2-3 TM9-1425-474- 34-1 (M2/M3) TM9-1425-453- 34-1 (M2A1/ M3A1) LAMP WINDOW COLLAR ASSEMBLY Manual re- ferred for M2A2  and M3A2  vehicles TM9-2350-284- 20-2-3 —— TM9-2350-284- 20-2-3 TM9-1425-453- 34-1 LAMPHOLDER  COVER  (M2,  M3,  ONLY) Figure  3-49  Lamp  Assembly (k) For M2A1, M3A1, M2A2, and M3A2 only, re- duce pressure from 4 psig to approximately 1.5 psig. (l) For M2, M3, M2A1, and M3A1 only, close sight shield  assembly  per  TM  9-2350-252-20-2-3. (m) For M2A2 and M3A2 only, install ballistic sight shield  assembly  per  TM  9-2350-284-20-2-3. (n) Close and secure gunner’s hatch cover per TM 9-2350-252-10-2 (for M2, M3, M2A1, and M3A1 only) or TM 9-2350-284-10-2 (for M2A2 and M3A2 only). (3) Commander’s Relay Assembly (figs. 3-50 and  3-51). Figure  3-50  Commander’s  Relay  Assembly Commander’s Relay Assembly seals could rupture if pressure is too high. Never let low pressure gage get higher than 4 psig. (a) Open and secure gunner’s hatch cover per TM 9-2350-252-10-2   (for   M2,   M3,   M2A1,   and   M3A1   only)   or TM 9-2350-284-10-2 (for M2A2 and M3A2 only). NOTE Shim(s) may or may not be present between night  sight  cover  support  and  turret. (b) For M2A2 and M3A2 only, remove two screws, washers, shim(s), and night sight cover actuator handle/sup- port. 3-22

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