Quantcast 6.  FAN SPEED DOES NOT LOWER FROM HIGH SPEED TO LOW SPEED (CONT) - TM-9-2320-364-20-3_1054

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Page Title: 6. FAN SPEED DOES NOT LOWER FROM HIGH SPEED TO LOW SPEED (CONT)
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VOLTAGE TEST - TM-9-2320-364-20-3_1053
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VOLTAGE TEST - TM-9-2320-364-20-3_1055
TM 9-2320-364-20-3 2-2932 6.  FAN SPEED DOES NOT LOWER FROM HIGH SPEED TO LOW SPEED (CONT). Heater blower motor operates,   indicating CB15 OK. Fan operates at low speed with   hydraulic selector switch   in AUTO or CRANE/SRW   position. Fan speed does not lower with   throttle position switch   depressed. Wire 1956 is OK. Throttle postion switch OK. Wire 1957 OK. Turbo boost pressure switch   faulty. Wire 1955 faulty. KNOWN INFO POSSIBLE PROBLEMS TEST OPTIONS REASON FOR QUESTION Voltage test. STE/ICE-R #89. If turbo boost pressure switch is faulty, 22 to 28 vdc will not be present on wire 1955. YES NO Replace turbo boost pressure switch (Para 7-61). Verify repair, go to Step 19 of this Fault 17. Are 22 to 28 vdc measured on wire 1955 at the turbo boost pressure switch? Repair wire 1955 (see schematic Fig 2-67) or notify DS Maintenance. Verify repair, go to Step 19 of this Fault. 16. Are 22 to 28 vdc measured on wire 1957 at the turbo boost pressure switch? YES NO Heater blower motor operates,   indicating CB15 OK. Fan operates at low speed   with hydraulic selector switch   in AUTO or CRANE/SRW   position. Fan speed does not lower with   throttle position switch   depressed. Wire 1956 is OK. Throttle position switch OK. Wire 1957 faulty. Turbo boost pressure switch   faulty. Wire 1955 faulty. KNOWN INFO POSSIBLE PROBLEMS TEST OPTIONS REASON FOR QUESTION Voltage test. STE/ICE-R #89. If wire 1957 is loose, faulty, or shorted to ground, 22 to 28 vdc will not be present at turbo boost pressure switch. Repair wire 1957 (see schematic Fig 2-67) or notify DS Maintenance.   Verify repair, go to Step 19 of this Fault. WARNING Read   WARNING on Page 2-2933

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