(1) Drain air tanks (TM 9-2320-365-10).
(2) Loosen air hose 502 at secondary air tank
inversion valve delivery port.
(3) Start engine and charge air tanks
(TM 9-2320-365-10).
(4) Check for presence of air at secondary air tank
inversion valve delivery port.
(5) If air is not present, replace secondary air tank
inversion valve (para 23-4).
(6) If air is present, replace air hose 502
(para 23-3).
(7) Drain air tanks (TM 9-2320-365-10).
(8) Tighten air hose 502 at secondary air tank
inversion valve delivery port.
Change 1 2-1968.7
TM 9-2320-365-20-2