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Transmission - TM-5-4210-220-12_148
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TM-5-4210-220-12 Truck Firefighting: Powered Pumper: Foam and Water 500-GPM Capacity; Centrifugal Pump Power Takeoff Driven Manual
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Main Engine Test Continued
TM 5-4210-220-12 4-4.  INTRODUCTION - Continued k. Auxiliary Power Unit Continued (6) Inspect fuel line connections for evidence of leakage.  Tighten, or remake joints as required. m. Auxiliary Power Unit Test (1) Start auxiliary power unit (Refer to para. 2-12).  (If unit falls to start due to discharged main batteries, start manually). (2) Start   winterization   system   and   check   operation   of   the   circulating   pump,   compartment   heaters   and winterization heater. (3) Allow to run for 20 minutes and then stop winterization heater. (4) Check  for  any  leaks  in  the  winterization  system  and  repair  as  required.    Stop  APU  when  inspection complete. n. Main Engine Test (1) Start main engine (Refer to para. 2-10). (2) When engine is running, check. - oil pressure builds up to at least 20 psi (140 kPa), warning lamp extinguishes. - air pressure warning lamps extinguish (primary and secondary). - engine air filter gage remains in safety zone. - engine water temperature warning lamp extinguishes. - battery voltage and current (amps) remain in safety zone. - transmission oil temperature lamp extinguishes. (3) Check operation of all lamps, beacons. - tall park and head lights (high beam and low beam) - marker lights - spotlights - panel lights - dome lights - rear beacon lights - compartment lights - hose pick-up lights - engine compartment lights - dash lights Replace any lamps that have failed. (4) Check operation of rear buzzer, main siren, and PA system. (5) Check operation of radiator shutter manual override.  When engine is not running, shutter is closed.  When engine   is   started,   shutter   closes   and   fan   freewheels.      When   engine   warms   up,   fan   lock   ups   and   shutter   opens automatically. (6) Allow engine to warm up to 170-195 deg. F (75-90 deg. C). 4-5

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