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00 INDEX AND FOREWORD
MAINTENANCE STANDARD OF ATTACHMENT CIRCUIT SELECTOR VALVE (FOR LOW PRES-
SURE) ........................................................................................................................................ 60-61
MAINTENANCE STANDARD OF CENTER SWIVEL JOINT.......................................................... 60-62
WORK EQUIPMENT............................................................................................................................. 60-63
MAINTENANCE STANDARD OF WORK EQUIPMENT LINKAGE (ROAD BUILDER)................... 60-63
MAINTENANCE STANDARD OF WORK EQUIPMENT LINKAGE (LOG LOADER) ...................... 60-72
MAINTENANCE STANDARD OF BOOM CYLINDER .................................................................... 60-78
MAINTENANCE STANDARD OF ARM CYLINDER ....................................................................... 60-80
MAINTENANCE STANDARD OF BUCKET/HEEL CYLINDER....................................................... 60-82
80 APPENDIX................................................................................................................................................ 80-1
CONTENTS ............................................................................................................................................ 80-2
ABBREVIATION LIST ............................................................................................................................. 80-4
AIR CONDITIONER SYSTEM ................................................................................................................ 80-9
PRECAUTIONS FOR REFRIGERANT ............................................................................................ 80-9
AIR CONDITIONER COMPONENT ............................................................................................... 80-10
SPECIFICATIONS OF AIR CONDITIONER ................................................................................... 80-12
CONFIGURATION AND FUNCTION OF REFRIGERATION CYCLE ............................................. 80-13
OUTLINE OF REFRIGERATION CYCLE ....................................................................................... 80-14
COMPONENT PARTS OF AIR CONDITIONER SYSTEM ............................................................. 80-16
EXPLANATION OF PROCEDURE FOR TESTING AND TROUBLESHOOTING OF AIR CONDITION-
ER .............................................................................................................................................. 80-30
CIRCUIT DIAGRAM AND ARRANGEMENT OF CONNECTOR PINS FOR AIR CONDITIONER .. 80-32
AIR CONDITIONER SYSTEM DIAGRAM ...................................................................................... 80-34
INSTALLATION LOCATIONS OF AIR CONDITIONER PARTS AND ARRANGEMENT OF CONNEC-
TORS ......................................................................................................................................... 80-37
TESTING AIR LEAKAGE (DUCT).................................................................................................. 80-41
TESTING AIR CONDITIONER USING SELF-DIAGNOSIS FUNCTION......................................... 80-43
HOW TO OPEN THE ELECTRICAL SYSTEM ABNORMALITY RECORD SCREEN IN SERVICE
MODE OF THE MACHINE MONITOR........................................................................................ 80-44
TEST VENT (MODE) CHANGEOVER ........................................................................................... 80-45
TESTING FRESH/RECIRC AIR CHANGEOVER........................................................................... 80-47
TEST SUNLIGHT SENSOR........................................................................................................... 80-48
TEST (DUAL) PRESSURE SWITCH FOR REFRIGERANT........................................................... 80-49
TEST RELAYS............................................................................................................................... 80-50
AIR CONDITIONER TROUBLESHOOTING CHART 1 .................................................................. 80-51
AIR CONDITIONER TROUBLESHOOTING CHART 2 .................................................................. 80-52
INFORMATION DESCRIBED IN TROUBLESHOOTING TABLE.................................................... 80-55
FAILURE CODE [879AKA] A/C Recirculation Air Temperature Sensor Open Circuit...................... 80-57
FAILURE CODE [879AKB] A/C Recirculation Air Temperature Sensor Short Circuit ...................... 80-58
FAILURE CODE [879BKA] A/C Fresh Air Temperature Sensor Open Circuit ................................. 80-59
FAILURE CODE [879BKB] A/C Fresh Air Temperature Sensor Short Circuit ................................. 80-61
FAILURE CODE [879CKA] Ventilating Sensor Open Circuit........................................................... 80-63
FAILURE CODE [879CKB] Ventilating Sensor Short Circuit........................................................... 80-64
FAILURE CODE [879DKZ] Sunlight Sensor Open Circuit or Short Circuit...................................... 80-65
FAILURE CODE [879EMC] Ventilation Damper Malfunction .......................................................... 80-67
FAILURE CODE [879FMC] Air Mix Damper Malfunction ................................................................ 80-68
FAILURE CODE [879GKX] Refrigerant Pressure Input Signal Out of Range ................................. 80-69
A-1 TROUBLESHOOTING FOR POWER SUPPLY SYSTEM (AIR CONDITIONER DOES NOT OPER-
ATE) ........................................................................................................................................... 80-71
A-2 TROUBLESHOOTING FOR COMPRESSOR AND REFRIGERANT SYSTEM (AIR IS NOT
COOLED) ................................................................................................................................... 80-73
A-3 TROUBLESHOOTING FOR BLOWER MOTOR SYSTEM (NO AIR COMES OUT OR AIR FLOW
IS ABNORMAL).......................................................................................................................... 80-76
A-4 TROUBLESHOOTING FOR FRESH/RECIRC AIR CHANGEOVER........................................ 80-78
TROUBLESHOOTING USING GAUGE PRESSURE..................................................................... 80-80
CONNECTION OF SERVICE TOOL .............................................................................................. 80-83
PRECAUTIONS FOR DISCONNECTING AND CONNECTING HOSES AND TUBES IN AIR CONDI-
TIONER PIPINGS ...................................................................................................................... 80-85
PC290LL-11
INDEX
00-17
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