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TM 5-4210-220-12
4-22 AIR SYSTEM - Continued
4-22.4 Relay Valve.
This task covers
a. Removal
b.
Installation
c.
Repair
TOOLS
MATERIALS/PARTS
Shop Equipment, Automotive
22, Appendix E Pipe Sealant
Maintenance and Repair,
NSN 4910-00-754-0705
EQUIPMENT CONDITION
Main Engine Shutdown (see para. 2-10)
APU Shutdown (see para. 2-12)
Batteries Disconnected (see para. 4-24)
All Air Tanks Drained
WARNING
Death or serious injury could occur if compressed air is directed against the skin. Always
drain all air tanks via the draincocks prior to maintaining the relay valve.
NOTE
This valve is installed on the frame cross member above the rear axle.
REMOVAL
(1)
Tag and disconnect air lines A, B, C, D and E
from relay valve
(2)
Remove locknuts and remove relay valve from
truck
(3)
Remove all pipe fittings from relay valve ports.
Make a sketch that indicates which fittings fit
which ports
INSTALLATION
(1)
Install pipe fittings in relay valve ports using
sketch as a guide. Coat all threads with pipe
sealant (item 22, Appendix E) prior to installation.
(2)
Install relay valve on truck using locknuts
(3)
Install air lines to valve ports. Be sure the air lines are connected the same as noted in step 1 of
REMOVAL preceding
(4)
Reconnect the batteries and start the truck main engine
4-348
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