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![]() TM 9-2320-363-20-2 
CONSTANT AIR JUNCTION BLOCK REPLACEMENT 
This task covers: 
a. Removal 
b. Cleaning/Inspection 
c. Installation 
INITIAL SETUP 
Tools and Special Equipment: 
General Safety Instructions: 
Shop Equipment, SC 4910-95-CL-A72 
Tool Kit, SC 5180-90-CL-N26 
WARNING 
 Make sure all air lines and 
Materials/Parts: 
fitting s are clear of debris. 
Nut, Kep (2) 
P/N 420Z 
Make sure excess pipe 
sealant compound does not 
Compound, Pipe 
Appendix C, Item 8 
enter air lines or fittings. 
Failure to do so could result 
Equipment Condition: 
in equipment failure and/or 
injury to personnel. 
Reference 
Condition Description 
 Sealant compounds can burn 
Page 2-28 
Air System Drained 
easily, can give off harmful 
vapors, and are harmful to 
skin and clothing. To avoid 
injury or death, keep away 
from open fire and use in 
well-ventilated area. If sealant 
compound gets on skin or 
clothing, wash immediately 
with soap and water. 
REMOVAL 
NOTE 
Procedure is the same for all vehicles except as noted. 
1. 
REMOVE SIX TORX SCREWS (1), DASH TOP COVER (2), AND FIVE TORX SCREWS (3). SET TACHOGRAPH 
PANEL (4) ASIDE. 
Change 3 4-517 
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