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:
Materials/Parts:
Ref
Conditions
Detergent
(item 9, Appendix E)
l
Tag marker
(item 21, Appendix E)
l
Antiseize tape
(item 22, Appendix E)
l
Tools:
Personnel Required: Two
Tool kit, general mechanic's
l
Face shield
l
General Safety instructions:
Safety goggles
l
Wear safety goggles and face shield when
l
performing leakage tests on ratio relay
References:
valve.
l TM 9-2320-273-10 or
Ensure that air lines do not rub against
l
l TM 9-2320-283-10
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-
2320-283-10).
NOTE
Damage to other parts of air system
cause
parking/emergency
may
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
