3-12. AIR BRAKE SYSTEM MAINTENANCE (CONT)
c. Pressure Protection Valve (Cont).
For this procedure, you must use an air pressure regulator which can be
adjusted to reduce air pressure to 85 psi.
Connect an air pressure regulator to shop compressed air system.
Connect air hose from air pressure regulator outlet to pressure protec-
tion valve inlet.
Adjust air pressure regulator to 85 psi.
Check if air flows from pressure
protection valve outlet. If air
flows from outlet, turn cap
clockwise until air stops flow-
Turn cap counterclockwise just
until air flows from pressure
protection valve outlet.
Hold cap to prevent it from moving and
tighten nut against cap. Be sure air
continues to flow from pressure protec-
tion valve outlet.
Disconnect air hose from pressure protection valve.
Install pressure protection valve (refer to TM 5-3805-262-20).