TM 55-1520-240-T CHAPTER 6 DRIVE SYSTEM TROUBLESHOOTING CHAPTER OVERVIEW Chapter 6 contains procedures for Drive System troubleshooting.  Each system and failure symptom is listed below.  Included in this chapter are locations and views of all electrical connectors, receptacles, relays, and ground connections for the Drive System. Refer to TM 55-1520-240-23 for required maintenance procedures. SYSTEM PARA TRANSMISSION LUBRICATION SYSTEMS 6-1 TRANSMISSION CHIP DETECTORS AND DEBRIS INDICATING SCREENS 6-2 FAILURE SYMPTOM LIST TRANSMISSION LUBRICATION SYSTEMS SYSTEM TASK XMSN AUX OIL PRESS CAPSULE ON WITH ROTORS TURNING 6-1.3 XMSN OIL HOT CAPSULE ON, ONE TRANSMISSION OIL TEMPERATURE INDICATION HIGH 6-1.3 XMSN OIL PRESS CAPSULE ON AND ONE TRANSMISSION OIL PRESSURE INDICATION LOW 6-1.3 XMSN OIL PRESS CAPSULE ON, TRANSMISSION OIL PRESSURE INDICATIONS NORMAL 6-1.3 TRANSMISSION CHIP DETECTORS AND INDICATING SCREENS SYMPTOM TASK AFT TRANSMISSION DEBRIS SCREEN INDICATOR DOES NOT CHANGE TO BLACK-AND-WHITE FAN DISPLAY WHEN DEBRIS SCREEN SHORTED 6-2.3 FWD TRANSMISSION DEBRIS SCREEN INDICATOR DOES NOT CHANGE TO BLACK-AND-WHITE FAN DISPLAY WHEN DEBRIS SCREEN SHORTED 6-2.3 LEFT TRANSMISSION DEBRIS SCREEN INDICATOR DOES NOT CHANGE TO BLACK-AND-WHITE FAN DISPLAY WHEN DEBRIS SCREEN SHORTED 6-2.3 LH COMB TRANSMISSION DEBRIS SCREEN INDICATOR DOES NOT CHANGE TO BLACK-AND-WHITE FAN DISPLAY WHEN DEBRIS SCREEN SHORTED 6-2.3 NO. 1 ENG CHIP DET (WITHOUT 74, ENG 1 CHIP DETR (WITH 74) CAPSULE DOES NOT COME ON WHEN NO. 1 ENGINE TRANSMISSION CHIP DETECTOR SHORTED 6-2.3 SYMPTOM TASK NO. 1 OR NO. 2 ENG CHIP DET (WITHOUT 74) ENG 1 OR ENG 2 CHIP DETR (WITH 74) CAPSULE LIT, TRANSMISSION OR ENGINE CHIP DETECTOR INDICATOR BLACK-AND- WHITE 6-2.3 NO. 2 ENG CHIP DET (WITHOUT 74), ENG 2 CHIP DETR (WITH 74) CAPSULE DOES NOT COME ON WHEN NO. 2 ENGINE TRANSMISSION CHIP DET SHORTED 6-2.3 RH COMB TRANSMISSION DEBRIS SCREEN INDICATOR DOES NOT CHANGE TO BLACK-AND-WHITE FAN DISPLAY WHEN DEBRIS SCREEN SHORTED 6-2.3 RIGHT TRANSMISSION DEBRIS SCREEN INDICATOR DOES NOT CHANGE TO BLACK-AND-WHITE FAN DISPLAY WHEN DEBRIS SCREEN SHORTED 6-2.3 SYMPTOM TASK TRANSMISSION CHIP DETECTOR INDICATOR DISPLAYS BLACK-AND-WHITE FAN, XMSN CHIP DET (WITHOUT 74) XMSN CHIP DETR (WITH 74) CAPSULE OUT 6-2.3 TRANSMISSION CHIP DETECTOR INDICATOR IS ALL BLACK WHEN GND SWITCH IS SET TO TEST 6-2.3 TRANSMISSION DEBRIS SCREEN INDICATOR DISPLAYS BLACK-AND-WHITE FAN 6-2.3 TRANSMISSION DEBRIS SCREEN INDICATOR IS ALL BLACK WHEN GND SWITCH IS SET TO TEST 6-2.3 XMSN CHIP DET (WITHOUT 74), XMSN CHIP DETR (WITH 74) CAPSULE DOES NOT COME ON WHEN AFT SHAFT CHIP DETECTOR SHORTED 6-2.3 XMSN CHIP DET (WITHOUT 74), XMSN CHIP DETR (WITH 74) CAPSULE DOES NOT COME ON WHEN AFT TRANSMISSION CHIP DETECTOR SHORTED 6-2.3 Change 17  6-2.1