Table 3-1. INTERMEDIATE DIRECT SUPPORT AND INTERMEDIATE GENERAL SUPPORT
TEST OR INSPECTION
23. THERE IS CONTINUOUS BLOW FROM THE EXHAUST WITH THE HANDLE IN RELEASE POSITION.
Step 2. Check for brake cylinder pressure not approaching main reservoir pressure in APPLICATION position of
the independent brake valve.
Replace O-ring in the independent brake valve (center O-ring) (para 4-12).
A-1 CHARGING CUTOFF PILOT VALVE
24. THERE IS CONTINUOUS SANDING.
Check for air leaking from the sanding choke.
Replace O-ring on the actuating piston of the A-1 charging cutoffpilot valve (2nd O-ring from top)
6-NFR DISTRIBUTING VALVE
25. AUTOMATIC BRAKE CYLINDER PRESSURE FAILS
TO DEVELOP OR APPLIES AND REDUCES TO ZERO.
Step 1. Check for a blow of air at port 9 of H-5 relay air valve.
Repair or replace H-5 relay air valve seat that is leaking (port 11 to port 9) (para 4-16).
Step 2. Check for a blow of air at automatic brake valve exhaust cavity.
Repair or replace pipe 12 check valve seat that is leaking.
Step 3. Check for a blow of air at safety valve.
Repair or replace safety valve seat that is leaking (para 4-13).
Step 4. Check for a blow of air at application piston exhaust during application.
Repair or replace leak in application valve diaphragm (para 4-13).
Step 5. Check for a blow of air at independent brake valve exhaust.
Replace No. 24 double check valve (port 20) (para 3-54).