Specifications

TM 9-2330-384-14&P
4-42. RATIO RELAY VALVE MAINTENANCE.
THIS TASK COVERS
a.
Operating Test
c.
Removal
b.
Leakage Test
d.
installation
INITIAL SETUP
Equipment Conditions:
Ref Conditions
2-11 Wheels chocked.
Tools:
l Tool kit, general mechanic’s
l Face shield
l Safety goggles
References:
l TM 9-2320-273-10 or
l TM 9-2320-283-10
Materials/Parts:
l Detergent
(item 9, Appendix E)
l Tag marker
(item 21, Appendix E)
l Antiseize tape
(item 22, Appendix E)
Personnel Required: Two
General Safety instructions:
l Wear safety goggles and face shield when
performing leakage tests on ratio relay
valve.
l Ensure that air lines do not rub against
each other or any other surface when in-
stalled.
a. OPERATING TEST
(1) If disconnected, connect tractor EMERGENCY and SERVICE air lines to semitrailer (see para-
graph 2-12). Fully pressurize semitrailer air system (see TM 9-2320-273-10 or TM 9-
2320-283-10).
NOTE
Damage to other parts of air system
may
cause parking/emergency
brakes to not release with air fully
pressurized.
(2) With air system fully pressurized,
check to see that parking/emer-
gency brakes are released. if not
released, ratio relay valve (3)
may be damaged.
4-126