SECTION 5
TROUBLESHOOTING
TABLE 5-9. TROUBLE ANALYSIS FOR TIRE INFLATION SYSTEM (CONT.).
CORRECTIVE ACTION
PROBABLE CAUSE
TROUBLE
Adjust safety valve. Observe tire
Safety Valve "Blows
Safety valve out of adjustment.
ply vs. air pressure table.
Off"
Adjust governor.
Governor out of adjustment.
Clean screen.
Dirty screen.
Regulator Pressure
"Creeps"
Clean, repair, or replace as
Valve disc dirty, rough or pitted.
necessary.
Clean, repair, or replace as
Valve seat dirty, rough or pitted.
necessary.
Clean guide plug or O-ring.
Guide plug or O-ring dirty.
Regulating Valve
Action Is Uneven
Or Faulty
Grease O-ring groove.
No grease in O-ring groove.
Lubricate, repair, or replace O-ring
Valve pin O-ring nicked,
as necessary.
scratched, dirty, or not
lubricated.
Clean screen.
Dirty screen.
Little Or No Air Flow
Through Regulating
Valve
C l e a n valve.
Dirty valve.
Tighten bonnet screws.
Bonnet screws loose.
Air Leaks Between
Regulator Bonnet
and Body
Replace diaphragm.
Defective diaphragm.
Replace valve pin and relief
Defective valve pin and relief
Air Leaks
seat.
seat.
Continuously From
Regulator Bonnet Hole
Replace diaphragm.
Defective diaphragm.
Seat regulating spring in lower
Regulating spring not seated in
s p r i n g rest.
lower spring rest.
Clean, repair, or replace valve
Valve disc and seat nicked,
disc and/or seat as necessary.
scratched or dirty.
Replace
Rotary unions leaking.
Tires go flat over
night.
Replace.
Pressure holding valve defective.
5-57