(1) Remove roll pins from knobs of SYSTEMPARK and TRAILER AIR SUPPLY valves.(2) Remove SYSTEM PARK and TRAILER AIRSUPPLY valve knobs.(3) Unscrew nuts at base of valve stem on eachvalve.(4) Remove six screws and dash plate frompersonnel heater.(5) Pull out TRAILER AIR SUPPLY valve frompersonnel heater.(6) Loosen air hose 102 at TRAILER AIR SUPPLYvalve delivery port.(7) Start engine (TM 9-2320-365-10).(8) Push in SYSTEM PARK control(TM 9-2320-365-10).(9) Push in TRAILER AIR SUPPLY valve stem.(10) Check for presence of air at TRAILER AIRSUPPLY valve delivery port.(11) If air is not present, go to step 8 of this fault.(12) If air is present, replace air hose 102(para 11-19).(13) Shut down engine (TM 9-2320-365-10).(14) Tighten air hose 102 at TRAILER AIR SUPPLYvalve delivery port.Change 1 2-1742.9TM 9-2320-365-20-2
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