TM 5-4930-244-14
4-51. EMERGENCY RELAY VALVE - REPLACE.
This Task Covers:
a. Removal
b. Installation
Initial Setup:
Tools Required
Tool Kit, General Mechanic's Automotive (Appendix B, Section III, Item 1).
Materials/Parts Required
Teflon Tape (Appendix E, Section II, Item 7)
Rags, wiping (Appendix E, Section II, Item 1)
Equipment Condition
Unit shut down and cool
WARNING
·
Chock wheels when unit is not on a level surface. Unit could roll and cause
injury.
·
Compressed air may cause severe injury or death, if not used properly.
Make sure that air pressure in trailer brake system is completely drained
before maintenance.
a. Removal. (Refer to Figure 4-51).
(1)
Completely vent trailer air brake system pressure by opening drain valve (1). Then close drain valve (1).
(2)
Tag and identify five air brake lines (2)
(3)
Disconnect five air brake lines (2) from emergency relay valve (3) fittings
(4)
Unthread hex nipple (4) and emergency relay valve (3) from tank bracket (5)
(5)
Remove hex nipple (4) from emergency relay valve (3).
(6)
Remove five air brake fittings (6), bushing (7) and plugs (8) from emergency relay valve (3) (7) Clean and inspect
emergency relay valve (3), fittings (6), bushing (7) and plugs (8) and air brake lines (2).
b. Installation.
NOTE
Before installation wrap threads on hex nipple (4) and fittings (6), bushing (7) and
plugs (8) with Teflon Tape.
(1)
Install hex nipple (4) into tank bracket (5)
4-157
