CHAPTER 9: MAINTENANCE OF HULL- AND CAB-RELATED COMPONENTS
TM 9-2350-256-20
9-41 REPLACE DRIVER'S AND RIGGER'S PERISCOPE BLOCKS AND VISION PRISMS— Continued
7
Remove lockwire (12).
8
Remove two bolts (13).
NOTE
Bolt (13) placed in center hole (14) of wedge
plate (15) will act as a jacking screw.
9
Place 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.
INSTALLATION
NOTE
•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.
1
Apply sealing compound to vision prism (9) and install
new seal (11). Remove excess sealing compound.
2
Install vision prism (9) and wedge plate (8) with screw
(10) in center hole.
3
Install two screws (7) in wedge plate (8). Torque to 84-
120 lb-in. (9.5-13.6 N•m).
4
Secure three screws (7 and 10) with new lockwire (6).
5
Apply sealing compound between vision prism (16),
hull opening, and seal (17).
6
Install vision prism (16) and wedge plate (15) with two
bolts (13). Torque bolts to 84-120 lb-in. (9.5-13.6
N•m).
7
Secure two bolts (13) with new lockwire (12).
9-68
