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5.  PARKING BRAKES ON AXLE NO. 3 DO NOT APPLY (CONT) - TM-9-2320-364-20-2_1006
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TM-9-2320-364-20-2 Truck Tractor Line Haul 52 000 GVWR 6x4 M915A2 Truck Tractor Light Equipment Transporter (Let) Manual
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5.  PARKING BRAKES ON AXLE NO. 3 DO NOT APPLY (CONT) - TM-9-2320-364-20-2_1008
TM 9-2320-364-20-2      2-1783 Truck must be on level ground and wheels must be chocked before parking brake is released.  Otherwise, truck may roll and cause injury to personnel. Wear safety goggles when performing leakage tests on valves.  Failure to do so may result in serious eye injury due to high pressure air. If air lines are under high pressure when they are disconnected, they can whip around and cause injury to personnel.  Caution should be exercised when loosening or disconnecting air line fittings. (1)   Start engine and build pressure to 125 4 psi (861 28 kPa) (TM 9-2320-364-10). (2)   Turn OFF ENGINE switch. (3)   Disconnect air line 2022 from right air chamber on Axle No. 3. (4)   Connect a 0 to 160 psi (0 to 1103 kPa) gage to air line 2022. (5)   Release and apply PARKING BRAKE. (a)   If there are 125 4 psi (861 28 kPa) present at air line 2022, perform Steps (6) and (7) below and replace relay spring valve No. 1 (Para 12-16). (b)   If there are not 125 4 psi (861 28 kPa) at air line 2022, relay spring valve No.1 is OK. (6)   Apply PARKING BRAKE. (7)   Remove gage and connect air hose 2022 to air chamber. RELAY SPRING VALVE NO. 1 TEST (1)   Listen to air chamber while assistant releases and applies PARKING BRAKE. (a)   If assistant cannot hear air chamber operate, or the brake shoe does not move when parking brake control is pushed and pulled, perform Step (2) below and replace air chamber (Para 12-10). (b)   If air chamber operates correctly, air chamber is OK. (2)   Release PARKING BRAKE. OPERATION TEST

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