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Komatsu PC78US-10 Hydraulic Excavator Service Manual

1,786 pages · Publication SEN06518-03

$179.75
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Models
PC78US-10
Serial coverage
30001 and up
Manual type
Service Manual
Pages
1,786
Publication
SEN06518-03
Condition
Brand new
Komatsu PC78US-10 Hydraulic Excavator Service Manual, publication SEN06518-03

What's inside

From the manual's own table of contents: 316 sections, 584 entries. See sample pages (PDF, 941 KB)

INDEX AND FOREWORD
ABBREVIATION LIST
FOREWORD, SAFETY, BASIC INFORMATION
HOW TO READ THE SHOP MANUAL
SAFETY NOTICE FOR OPERATION
PRECAUTIONS TO PREVENT FIRE
ACTIONS IF FIRE OCCURS
PRECAUTIONS FOR DISPOSING OF WASTE MATERIALS
PRECAUTIONS FOR HANDLING HYDRAULIC EQUIPMENT
PRECAUTIONS FOR DISCONNECTION AND CONNECTION OF PIPINGS
PRECAUTIONS FOR HANDLING ELECTRICAL EQUIPMENT
PRECAUTIONS FOR HANDLING FUEL SYSTEM EQUIPMENT
PRECAUTIONS FOR HANDLING INTAKE SYSTEM EQUIPMENT
PRACTICAL USE OF KOMTRAX
DISCONNECT AND CONNECT PUSH-PULL TYPE COUPLER
PRECAUTIONS FOR DISCONNECTION AND CONNECTION OF CONNECTORS
METHOD FOR DISCONNECTING AND CONNECTING DEUTSCH CONNECTOR
METHOD FOR DISCONNECTING AND CONNECTING SLIDE LOCK TYPE CONNECTOR
METHOD FOR DISCONNECTING AND CONNECTING CONNECTOR WITH LOCK TO PULL
METHOD FOR DISCONNECTING AND CONNECTING CONNECTOR WITH LOCK TO PUSH
HOW TO READ ELECTRICAL WIRE CODE
EXPLANATION OF TERMS FOR MAINTENANCE STANDARD
STANDARD TIGHTENING TORQUE TABLE
CONVERSION TABLE
Show all 316 sections
SPECIFICATIONS
SPECIFICATION DRAWING
WORKING RANGE DRAWINGS
WEIGHT TABLE
TABLE OF FUEL, COOLANT, AND LUBRICANTS
STRUCTURE AND FUNCTION
SYSTEM
LAYOUT DRAWING OF BOOT-UP SYSTEM
SYSTEM OPERATING LAMP SYSTEM
BATTERY DISCONNECT SWITCH
ENGINE SYSTEM
LAYOUT DRAWING OF ENGINE SYSTEM
ENGINE CONTROL SYSTEM
ENGINE AUTOMATIC WARM-UP SYSTEM
OVERHEAT PREVENTION SYSTEM
TURBOCHARGER PROTECTION SYSTEM
AUTOMATIC IDLE STOP SYSTEM
COMPONENT PARTS OF ENGINE SYSTEM
COOLING SYSTEM
LAYOUT DRAWING OF COOLING SYSTEM
CONTROL SYSTEM
LAYOUT DRAWING OF CONTROL SYSTEM
MACHINE MONITOR SYSTEM2 topics
  • KOMTRAX SYSTEM
  • COMPONENT PARTS OF CONTROL SYSTEM
HYDRAULIC SYSTEM4 topics
  • LAYOUT DRAWING OF HYDRAULIC SYSTEM
  • CLSS
  • ENGINE AND PUMP COMBINED CONTROL SYSTEM
  • COMPONENT PARTS OF HYDRAULIC SYSTEM
WORK EQUIPMENT SYSTEM7 topics
  • LAYOUT DRAWING OF WORK EQUIPMENT SYSTEM
  • STRUCTURE OF VALVE CONTROL
  • PPC LOCK SYSTEM
  • WORK EQUIPMENT AND TRAVEL AUTOMATIC LOCK SYSTEM
  • OVERLOAD CAUTION SYSTEM
  • OIL FLOW ADJUSTER SYSTEM FOR ATTACHMENT
  • COMPONENT PARTS OF WORK EQUIPMENT SYSTEM
SWING SYSTEM3 topics
  • LAYOUT DRAWING OF SWING SYSTEM
  • SWING CONTROL SYSTEM DIAGRAM
  • COMPONENT PARTS OF SWING SYSTEM
TRAVEL SYSTEM3 topics
  • LAYOUT DRAWING OF TRAVEL SYSTEM
  • TRAVEL CONTROL SYSTEM DIAGRAM
  • COMPONENT PARTS OF TRAVEL SYSTEM
UNDERCARRIAGE AND FRAME2 topics
  • LAYOUT DRAWING OF UNDERCARRIAGE
  • IDLER CUSHION
WORK EQUIPMENT4 topics
  • STRUCTURE OF WORK EQUIPMENT
  • FUNCTION OF WORK EQUIPMENT
  • WORK EQUIPMENT CLEARANCE ADJUSTMENT SHIM
  • BUCKET CLEARANCE ADJUSTMENT SHIM
CAB AND ITS ATTACHMENTS3 topics
  • ROPS CAB
  • CAB MOUNT
  • TAKE WIRING HARNESS OUT OF CAB
STANDARD VALUE TABLE
STANDARD VALUE TABLE FOR ENGINE1 topic
  • STANDARD VALUE TABLE FOR ENGINE: PC78US-10
STANDARD VALUE TABLE FOR MACHINE2 topics
  • STANDARD VALUE TABLE FOR MACHINE: PC78US-10
  • MACHINE POSTURE AND PROCEDURE FOR MEASURING PERFORMANCE
STANDARD VALUE TABLE FOR ELECTRICAL
TESTING AND ADJUSTING
RELATED INFORMATION ON TESTING AND ADJUSTING2 topics
  • TOOLS FOR TESTING AND ADJUSTING
  • SKETCH OF TOOLS FOR TESTING AND ADJUSTING
ENGINE AND COOLING SYSTEM6 topics
  • TEST ENGINE SPEED
  • TEST EXHAUST GAS COLOR
  • TEST AND ADJUST VALVE CLEARANCE
  • TEST COMPRESSION PRESSURE
  • TEST BLOWBY PRESSURE
  • TEST ENGINE OIL PRESSURE
TEST FUEL PRESSURE
TEST FUEL RETURN RATE AND LEAKAGE
BLEED AIR FROM FUEL SYSTEM
TEST FUEL CIRCUIT FOR LEAKAGE
HANDLE CYLINDER CUT-OUT MODE OPERATION
HANDLE NO-INJECTION CRANKING OPERATION
TEST AND ADJUST AIR CONDITIONER COMPRESSOR BELT TENSION
TEST ALTERNATOR BELT
TEST AUTOMATIC TENSIONER
WRITE INJECTOR COMPENSATION VALUE TO ENGINE CONTROLLER
POWER TRAIN
TEST SWING CIRCLE BEARING CLEARANCE
TEST AND ADJUST TRACK TENSION
RELEASE REMAINING PRESSURE FROM HYDRAULIC SYSTEM
TEST AND ADJUST OIL PRESSURE IN WORK EQUIPMENT, AND TRAVEL CIRCUITS
TEST AND ADJUST SWING AND BLADE CIRCUIT OIL PRESSURE
TEST OIL PRESSURE OF CONTROL CIRCUIT
TEST AND ADJUST OIL PRESSURE IN PUMP PC CONTROL CIRCUIT
TEST AND ADJUST OIL PRESSURE IN PUMP LS CONTROL CIRCUIT
TEST OUTLET PRESSURE OF SOLENOID VALVE
TEST PPC VALVE OUTLET PRESSURE
ADJUST WORK EQUIPMENT AND SWING PPC VALVES
TEST AND ADJUST TRAVEL DEVIATION
TEST THE PARTS CAUSING HYDRAULIC DRIFT IN WORK EQUIPMENT
TEST OIL LEAKAGE
BLEED AIR FROM HYDRAULIC CIRCUIT
METHOD FOR ADJUSTING MIRRORS
TEST AND ADJUST ENGINE HOOD CATCHER
ELECTRICAL SYSTEM
SET AND OPERATE MACHINE MONITOR
METHOD FOR STARTING UP KOMTRAX TERMINAL
ADJUST REARVIEW CAMERA ANGLE
HANDLE VOLTAGE CIRCUIT OF ENGINE CONTROLLER
HANDLE BATTERY DISCONNECT SWITCH
TEST DIODES
Pm CLINIC
Pm CLINIC SERVICE
TROUBLESHOOTING
RELATED INFORMATION ON TROUBLESHOOTING
GENERAL TROUBLESHOOTING POINTS
SEQUENCE OF EVENTS IN TROUBLESHOOTING
CHECKS BEFORE TROUBLESHOOTING
INSPECTION PROCEDURE BEFORE TROUBLESHOOTING
TESTING IN ACCORDANCE WITH TESTING PROCEDURE
ELECTRICAL SYSTEM TROUBLESHOOTING - PREPARATION
PROCEDURE FOR TESTING AND TROUBLESHOOTING
SYMPTOMS OF FAILURE AND TROUBLESHOOTING NUMBERS
INFORMATION DESCRIBED IN TROUBLESHOOTING TABLE1 topic
  • SOR SYSTEM
CONNECTORS LIST AND LAYOUT
CONNECTOR CONTACT IDENTIFICATION
BOX AND T-BRANCH ADAPTER TABLE2 topics
  • FUSE LOCATION TABLE
  • FAILURE CODES TABLE
TROUBLESHOOTING BY FAILURE CODE (DISPLAY OF CODE)55 topics
  • FAILURE CODE [879AKA]
  • FAILURE CODE [879AKB]
  • FAILURE CODE [879BKA]
  • FAILURE CODE [879BKB]
  • FAILURE CODE [879CKA]
  • FAILURE CODE [879CKB]
  • FAILURE CODE [879DKZ]
  • FAILURE CODE [879EMC]
  • FAILURE CODE [879FMC]
  • FAILURE CODE [879GKX]
  • FAILURE CODE [989L00]
  • FAILURE CODE [989M00]
  • FAILURE CODE [989N00]
  • FAILURE CODE [A900FR]
  • FAILURE CODE [A900N6]
  • FAILURE CODE [A900NY]
  • FAILURE CODE [AB00KE]
  • FAILURE CODE [B@BAZG]
  • FAILURE CODE [B@BCNS]
  • FAILURE CODE [CA115]
  • FAILURE CODE [CA122]
  • FAILURE CODE [CA123]
  • FAILURE CODE [CA131]
  • FAILURE CODE [CA132]
  • FAILURE CODE [CA144]
  • FAILURE CODE [CA145]
  • FAILURE CODE [CA153]
  • FAILURE CODE [CA154]
  • FAILURE CODE [CA187]
  • FAILURE CODE [CA221]
  • FAILURE CODE [CA222]
  • FAILURE CODE [CA227]
  • FAILURE CODE [CA234]
  • FAILURE CODE [CA238]
  • FAILURE CODE [CA239]
  • FAILURE CODE [CA271]
  • FAILURE CODE [CA272]
  • FAILURE CODE [CA322]
  • FAILURE CODE [CA324]
  • FAILURE CODE [CA331]
  • FAILURE CODE [CA332]
  • FAILURE CODE [CA343]
  • FAILURE CODE [CA351]
  • FAILURE CODE [CA352]
  • FAILURE CODE [CA356]
  • FAILURE CODE [CA357]
  • FAILURE CODE [CA386]
  • FAILURE CODE [CA435]
  • FAILURE CODE [CA441]
  • FAILURE CODE [CA442]
  • FAILURE CODE [CA449]
  • FAILURE CODE [CA451]
  • FAILURE CODE [CA452]
  • FAILURE CODE [CA466]
  • FAILURE CODE [CA515]
FAILURE CODE [CA516]
FAILURE CODE [CA553]
FAILURE CODE [CA555]
FAILURE CODE [CA556]
FAILURE CODE [CA559]
FAILURE CODE [CA689]
FAILURE CODE [CA691]
FAILURE CODE [CA692]
FAILURE CODE [CA697]
FAILURE CODE [CA698]
FAILURE CODE [CA731]
FAILURE CODE [CA778]
FAILURE CODE [CA1117]
FAILURE CODE [CA1695]
FAILURE CODE [CA1696]
FAILURE CODE [CA1843]
FAILURE CODE [CA1844]
FAILURE CODE [CA1896]
FAILURE CODE [CA1942]
FAILURE CODE [CA1961]
FAILURE CODE [CA2185]
FAILURE CODE [CA2186]
FAILURE CODE [CA2249]
FAILURE CODE [CA2272]
FAILURE CODE [CA2311]
FAILURE CODE [CA2349]
FAILURE CODE [CA2353]
FAILURE CODE [CA2357]
FAILURE CODE [CA2765]
FAILURE CODE [CA3419]
FAILURE CODE [CA3421]
FAILURE CODE [CA3724]
FAILURE CODE [CA3918]
FAILURE CODE [CA3919]
FAILURE CODE [CA3921]
FAILURE CODE [CA3922]
FAILURE CODE [CA3923]
FAILURE CODE [D110KB]
FAILURE CODE [D19JKZ]
FAILURE CODE [D811MC]
FAILURE CODE [D862KA]
FAILURE CODE [D8ALKA]
FAILURE CODE [D8ALKB]
FAILURE CODE [D8AQKR]
FAILURE CODE [DA20MC]
FAILURE CODE [DA22KK]
FAILURE CODE [DA25KP]
FAILURE CODE [DA26KP]
FAILURE CODE [DA29KQ]
FAILURE CODE [DA2LKA]
FAILURE CODE [DA2LKB]
FAILURE CODE [DA2QKR]
FAILURE CODE [DA2RKR]
FAILURE CODE [DAF0MB]
FAILURE CODE [DAF0MC]
FAILURE CODE [DAF8KB]
FAILURE CODE [DAF9KQ]
FAILURE CODE [DAFGMC]45 topics
  • FAILURE CODE [DAFLKA]
  • FAILURE CODE [DAFLKB]
  • FAILURE CODE [DAFQKR]
  • FAILURE CODE [DAZ9KQ]
  • FAILURE CODE [DAZQKR]
  • FAILURE CODE [DB2QKR]
  • FAILURE CODE [DB2RKR]
  • FAILURE CODE [DDNRKA]
  • FAILURE CODE [DDNRKY]
  • FAILURE CODE [DDNS00]
  • FAILURE CODE [DGH2KB]
  • FAILURE CODE [DHPAMA]
  • FAILURE CODE [DHS3MA]
  • FAILURE CODE [DHS4MA]
  • FAILURE CODE [DHS5MA]
  • FAILURE CODE [DHS8MA]
  • FAILURE CODE [DHS9MA]
  • FAILURE CODE [DHSAMA]
  • FAILURE CODE [DHSBMA]
  • FAILURE CODE [DHSCMA]
  • FAILURE CODE [DHSDMA]
  • FAILURE CODE [DKULKA]
  • FAILURE CODE [DKULKB]
  • FAILURE CODE [DKULKY]
  • FAILURE CODE [DV20KB]
  • FAILURE CODE [DW43KA]
  • FAILURE CODE [DW43KB]
  • FAILURE CODE [DW43KY]
  • FAILURE CODE [DW45KA]
  • FAILURE CODE [DW45KB]
  • FAILURE CODE [DW45KY]
  • FAILURE CODE [DW4CKY]
  • FAILURE CODE [DWJ0KA]
  • FAILURE CODE [DWJ0KB]
  • FAILURE CODE [DWJ0KY]
  • FAILURE CODE [DXA8KA]
  • FAILURE CODE [DXA8KB]
  • FAILURE CODE [DXE4KA]
  • FAILURE CODE [DXE4KB]
  • FAILURE CODE [DXE4KY]
  • FAILURE CODE [DY20KA]
  • FAILURE CODE [DY20MA]
  • FAILURE CODE [DY2CKB]
  • FAILURE CODE [DY2DKB]
  • FAILURE CODE [DY2EKB]
TROUBLESHOOTING OF ELECTRICAL SYSTEM (E-MODE)7 topics
  • ENGINE DOES NOT START (ENGINE DOES NOT CRANK)
  • MANUAL PREHEATING SYSTEM DOES NOT WORK
  • WHILE PREHEATING IS WORKING, PREHEATING MONITOR DOES NOT LIGHT UP
  • NOTHING
  • NING
  • CHARGE LEVEL MONITOR LIGHTS UP IN RED WHILE ENGINE IS RUNNING
  • FUEL LEVEL MONITOR LIGHTS UP IN RED WHILE ENGINE IS RUNNING
ENGINE OIL PRESSURE MONITOR LIGHTS UP IN RED WHILE ENGINE IS RUNNING
FUEL GAUGE DISPLAY DOES NOT MOVE FROM MINIMUM OR MAXIMUM
DISPLAY OF FUEL GAUGE DIFFERS FROM ACTUAL FUEL LEVEL4 topics
  • OR MAXIMUM
  • ANT TEMPERATURE
  • MAXIMUM
  • PERATURE
SOME AREAS OF MACHINE MONITOR SCREEN ARE NOT DISPLAYED
FUNCTION SWITCH DOES NOT OPERATE
AUTOMATIC WARM-UP SYSTEM DOES NOT WORK (IN COLD WEATHER)1 topic
  • DOES NOT LIGHT UP OR DOES NOT GO OFF
AUTO-DECELERATOR IS NOT OPERATED OR CANCELED WITH LEVER3 topics
  • NOT DISPLAYED
  • NOT CHANGED
  • CHANGE
ALARM BUZZER CANNOT BE CANCELED
SERVICE MODE CANNOT BE SELECTED
ALL OF WORK EQUIPMENTS, SWING, AND TRAVEL MECHANISM DO NOT MOVE
ALL OF WORK EQUIPMENT, SWING, AND TRAVEL MECHANISM DO NOT LOCK3 topics
  • SWING
  • BRAKE DOES NOT OPERATE
  • SWITCH IS IN RELEASE POSITION
ALARM DOES NOT SOUND DURING TRAVEL
ALARM DOES NOT STOP SOUNDING WHILE MACHINE IS STOPPED
HORN DOES NOT SOUND
HORN DOES NOT STOP SOUNDING
WHEN WIPER SWITCH IS OPERATED, WINDSHIELD WIPER DOES NOT OPERATE
ARM IN INDICATOR IS NOT DISPLAYED PROPERLY WITH MONITORING FUNCTION4 topics
  • SWING INDICATOR IS NOT DISPLAYED PROPERLY WITH MONITORING FUNCTION
  • BLADE RAISE ON IS NOT DISPLAYED CORRECTLY WITH MONITORING
  • BLADE LOWER ON IS NOT DISPLAYED CORRECTLY WITH MONITORING
  • KOMTRAX SYSTEM DOES NOT OPERATE NORMALLY
TROUBLESHOOTING FOR HYDRAULIC AND MECHANICAL SYSTEMS (H MODE)35 topics
  • INFORMATION MENTIONED IN TROUBLESHOOTING TABLE (H MODE)
  • SYSTEM CHART OF HYDRAULIC AND MECHANICAL SYSTEMS
  • FAILURE MODE AND CAUSE TABLE
  • ALL WORK EQUIPMENT, SWING AND TRAVEL DO NOT WORK
  • ALL WORK EQUIPMENT, SWING AND TRAVEL LACK SPEED AND POWER
  • FINE CONTROL PERFORMANCE OR RESPONSE IS POOR
  • UNUSUAL NOISE IS HEARD FROM AROUND HYDRAULIC PUMP
  • ENGINE SPEED DROPS LARGELY OR ENGINE STOPS
  • SPEED OR POWER OF BOOM IS LOW
  • ARM SPEED OR POWER IS LOW
  • BUCKET SPEED OR POWER IS LOW
  • BLADE SPEED OR POWER IS LOW
  • WORK EQUIPMENT DOES NOT MOVE IN SINGLE OPERATION
  • HYDRAULIC DRIFT OF BOOM IS LARGE
  • HYDRAULIC DRIFT OF ARM IS LARGE
  • HYDRAULIC DRIFT OF BUCKET IS LARGE
  • HYDRAULIC DRIFT OF BLADE IS LARGE
  • MENT MOVES
  • TIME LAG OF WORK EQUIPMENT IS LARGE
  • OIL FLOW IN ATTACHMENT CIRCUIT CANNOT BE CHANGED
  • MOVES SLOWER
  • SPEED DROPS LARGELY
  • MACHINE DOES NOT TRAVEL STRAIGHT
  • MACHINE IS NOT STEERED WELL OR STEERING POWER IS LOW
  • TRAVEL SPEED IS LOW
  • ONE OF TRACKS DOES NOT RUN
  • TRAVEL SPEED DOES NOT CHANGE, OR TRAVEL SPEED IS TOO SLOW OR FAST
  • UPPER STRUCTURE DOES NOT SWING BOTH TO THE RIGHT AND LEFT
  • SWINGS ONLY IN ONE DIRECTION
  • LEFT)
  • ONE DIRECTION
  • RIGHT AND LEFT)
  • DIRECTION EITHER RIGHT OR LEFT)
  • SHOCK IS LARGE WHEN UPPER STRUCTURE STOPS SWINGING
  • LARGE UNUSUAL NOISE IS HEARD WHEN UPPER STRUCTURE STOPS SWINGING
TROUBLESHOOTING OF ENGINE (S-MODE)
INFORMATION MENTIONED IN TROUBLESHOOTING TABLE (S MODE)
ENGINE CRANKS BUT NO EXHAUST GAS COMES OUT1 topic
  • BUT DOES NOT START)
ENGINE STARTABILITY IS POOR
ENGINE DOES NOT PICK UP SMOOTHLY
ENGINE STOPS DURING OPERATION
ENGINE RUNS ROUGH OR IS UNSTABLE
ENGINE LACKS POWER
EXHAUST SMOKE IS BLACK
ENGINE OIL CONSUMPTION IS EXCESSIVE
OIL BECOMES CONTAMINATED QUICKLY
FUEL CONSUMPTION IS EXCESSIVE
OIL PRESSURE DROPS
FUEL MIXES INTO ENGINE OIL
WATER MIXES INTO ENGINE OIL (MILKY)
COOLANT TEMPERATURE RISES TOO HIGH (OVERHEATING)
UNUSUAL NOISE IS HEARD
VIBRATION IS EXCESSIVE
AIR CANNOT BE BLED FROM FUEL CIRCUIT
DISASSEMBLY AND ASSEMBLY
RELATED INFORMATION ON DISASSEMBLY AND ASSEMBLY
HOW TO READ THIS MANUAL
COATING MATERIALS LIST
SPECIAL TOOLS LIST
SKETCHES OF SPECIAL TOOLS
REMOVE AND INSTALL SUPPLY PUMP ASSEMBLY
REMOVE AND INSTALL INJECTOR ASSEMBLY
REMOVE AND INSTALL CYLINDER HEAD ASSEMBLY
REMOVE AND INSTALL EGR VALVE ASSEMBLY
REMOVE AND INSTALL EGR COOLER ASSEMBLY
REMOVE AND INSTALL STARTER ASSEMBLY
REMOVE AND INSTALL ALTERNATOR BELT
REMOVE AND INSTALL AUTOMATIC TENSIONER
REMOVE AND INSTALL RADIATOR ASSEMBLY
REMOVE AND INSTALL HYDRAULIC OIL COOLER ASSEMBLY
REMOVE AND INSTALL AFTERCOOLER ASSEMBLY
REMOVE AND INSTALL ENGINE AND MAIN PUMP ASSEMBLY
REMOVE AND INSTALL ENGINE FRONT OIL SEAL
REMOVE AND INSTALL ENGINE REAR OIL SEAL
REMOVE AND INSTALL FUEL COOLER ASSEMBLY
REMOVE AND INSTALL ENGINE HOOD ASSEMBLY
REMOVE AND INSTALL KDOC MUFFLER
REMOVE AND INSTALL FUEL TANK ASSEMBLY
REMOVE AND INSTALL KCCV VENTILATOR ASSEMBLY
REMOVE AND INSTALL AIR CLEANER ASSEMBLY
REMOVE AND INSTALL AIR CONDITIONER COMPRESSOR ASSEMBLY
REMOVE AND INSTALL AIR CONDITIONER CONDENSER ASSEMBLY41 topics
  • REMOVE AND INSTALL TRAVEL MOTOR AND FINAL DRIVE ASSEMBLY
  • DISASSEMBLE AND ASSEMBLE TRAVEL MOTOR AND FINAL DRIVE ASSEMBLY
  • REMOVE AND INSTALL SWING MOTOR AND SWING MACHINERY ASSEMBLY
  • DISASSEMBLE AND ASSEMBLE SWING MACHINERY ASSEMBLY
  • REMOVE AND INSTALL SWING CIRCLE ASSEMBLY
  • SEPARATION AND CONNECTION OF TRACK ASSEMBLY
  • REMOVE AND INSTALL SPROCKET
  • REMOVE AND INSTALL IDLER AND IDLER CUSHION ASSEMBLY
  • DISASSEMBLE AND ASSEMBLE IDLER ASSEMBLY
  • DISASSEMBLE AND ASSEMBLE OF IDLER CUSHION ASSEMBLY
  • DISASSEMBLE AND ASSEMBLE TRACK ROLLER ASSEMBLY
  • REMOVE AND INSTALL REVOLVING FRAME ASSEMBLY
  • REMOVE AND INSTALL COUNTERWEIGHT ASSEMBLY
  • REMOVE AND INSTALL CENTER SWIVEL JOINT ASSEMBLY
  • DISASSEMBLE AND ASSEMBLE CENTER SWIVEL JOINT ASSEMBLY
  • REMOVE AND INSTALL HYDRAULIC TANK ASSEMBLY
  • REMOVE AND INSTALL MAIN PUMP ASSEMBLY
  • REMOVE AND INSTALL CONTROL VALVE ASSEMBLY
  • DISASSEMBLE AND ASSEMBLE WORK EQUIPMENT PPC VALVE ASSEMBLY
  • DISASSEMBLE AND ASSEMBLE TRAVEL PPC VALVE ASSEMBLY
  • REMOVE AND INSTALL BLADE ASSEMBLY
  • REMOVE AND INSTALL WORK EQUIPMENT ASSEMBLY
  • REMOVE AND INSTALL ANTI-DROP VALVE ASSEMBLY FOR BOOM
  • REMOVE AND INSTALL ANTI-DROP VALVE ASSEMBLY FOR ARM
  • DISASSEMBLE AND ASSEMBLE ANTI-DROP VALVE ASSEMBLY
  • DISASSEMBLE AND ASSEMBLE WORK EQUIPMENT CYLINDER ASSEMBLY
  • REMOVE AND INSTALL OPERATOR'S CAB ASSEMBLY
  • REMOVE AND INSTALL OPERATOR'S CAB DOOR
  • REMOVE AND INSTALL OPERATOR CAB GLASS (ADHERED GLASS)
  • REMOVE AND INSTALL FRONT WINDOW ASSEMBLY
  • REMOVE AND INSTALL FLOOR FRAME ASSEMBLY
  • REMOVE AND INSTALL AIR CONDITIONER UNIT ASSEMBLY
  • REMOVE AND INSTALL OPERATOR'S SEAT
  • REMOVE AND INSTALL SEAT BELT
  • REMOVE AND INSTALL FRONT WIPER ASSEMBLY
  • REMOVE AND INSTALL ENGINE CONTROLLER ASSEMBLY
  • REMOVE AND INSTALL PUMP CONTROLLER ASSEMBLY
  • REMOVE AND INSTALL MACHINE MONITOR ASSEMBLY
  • REMOVE AND INSTALL MASS AIR FLOW AND TEMPERATURE SENSOR
  • REMOVE AND INSTALL KCCV CRANKCASE PRESSURE SENSOR
  • REMOVE AND INSTALL KOMTRAX TERMINAL ASSEMBLY
MAINTENANCE STANDARD6 topics
  • MAINTENANCE STANDARD OF ENGINE MOUNT
  • MAINTENANCE STANDARD FOR PTO
  • MAINTENANCE STANDARD OF COOLING SYSTEM
  • MAINTENANCE STANDARD OF SWING CIRCLE
  • MAINTENANCE STANDARD OF SWING MACHINERY
  • MAINTENANCE STANDARD OF SPROCKET
MAINTENANCE STANDARD OF TRACK FRAME AND IDLER CUSHION
MAINTENANCE STANDARD OF IDLER
MAINTENANCE STANDARD OF TRACK ROLLER
MAINTENANCE STANDARD OF CARRIER ROLLER
MAINTENANCE STANDARD OF TRACK SHOE
MAINTENANCE STANDARD OF TRIPLE SHOE
MAINTENANCE STANDARD OF ROAD LINER
MAINTENANCE STANDARD FOR RUBBER SHOE
MAINTENANCE STANDARD OF HYDRAULIC TANK
MAINTENANCE STANDARD OF MAIN PUMP
MAINTENANCE STANDARD OF PC-EPC VALVE
MAINTENANCE STANDARD OF SWING MOTOR
MAINTENANCE STANDARD OF TRAVEL MOTOR
MAINTENANCE STANDARD OF CONTROL VALVE
MAINTENANCE STANDARD OF ANTI-DROP VALVE FOR BOOM
MAINTENANCE STANDARD OF ANTI-DROP VALVE FOR ARM
MAINTENANCE STANDARD OF WORK EQUIPMENT AND SWING PPC VALVE
MAINTENANCE STANDARD OF BLADE PPC VALVE
MAINTENANCE STANDARD OF TRAVEL PPC VALVE
MAINTENANCE STANDARD OF 1ST-LINE ATTACHMENT PPC VALVE (WITH EPC VALVE)
MAINTENANCE STANDARD OF SOLENOID VALVE1 topic
  • CIRCUIT)
MAINTENANCE STANDARD OF CENTER SWIVEL JOINT
MAINTENANCE STANDARD OF WORK EQUIPMENT LINKAGE
MAINTENANCE STANDARD OF BOOM CYLINDER
MAINTENANCE STANDARD OF ARM CYLINDER
MAINTENANCE STANDARD OF BUCKET CYLINDER
MAINTENANCE STANDARD OF BLADE CYLINDER
APPENDIX
AIR CONDITIONER SYSTEM
PRECAUTIONS FOR REFRIGERANT
AIR CONDITIONER COMPONENT
SPECIFICATIONS OF AIR CONDITIONER
CONFIGURATION AND FUNCTION OF REFRIGERATION CYCLE
OUTLINE OF REFRIGERATION CYCLE
COMPONENT PARTS OF AIR CONDITIONER SYSTEM
AIR CONDITIONER UNIT
COMPONENT PARTS OF AIR CONDITIONER UNIT
AIR CONDITIONER CONTROLLER
COMPRESSOR
CONDENSER
RECEIVER DRIER
SENSORS FOR AIR CONDITIONER SYSTEM
CIRCUIT DIAGRAM AND ARRANGEMENT OF CONNECTOR PINS FOR AIR CONDITIONER
AIR CONDITIONER SYSTEM DIAGRAM
INPUT AND OUTPUT SIGNALS OF AIR CONDITIONER CONTROLLER
TESTING AIR LEAKAGE (DUCT)
METHOD FOR TESTING AIR LEAKAGE (DUCT)
TESTING AIR CONDITIONER USING SELF-DIAGNOSIS FUNCTION
OF THE MACHINE MONITOR
TEST VENT (MODE) CHANGEOVER1 topic
  • METHOD FOR TESTING VENT (MODE) CHANGEOVER
TESTING FRESH/RECIRC AIR CHANGEOVER1 topic
  • METHOD FOR TESTING FRESH/RECIRC AIR CHANGEOVER
TEST SUNLIGHT SENSOR1 topic
  • METHOD FOR TESTING SUNLIGHT SENSOR
TEST (DUAL) PRESSURE SWITCH FOR REFRIGERANT1 topic
  • METHOD FOR TESTING (DUAL) PRESSURE SWITCH FOR REFRIGERANT
TEST RELAYS1 topic
  • METHOD FOR TESTING RELAYS
AIR CONDITIONER TROUBLESHOOTING CHART 1
AIR CONDITIONER TROUBLESHOOTING CHART 2
FAILURE CODE [879AKA]
FAILURE CODE [879AKB]
FAILURE CODE [879BKA]
FAILURE CODE [879BKB]
FAILURE CODE [879CKA]
FAILURE CODE [879CKB]
FAILURE CODE [879DKZ]
FAILURE CODE [879EMC]
FAILURE CODE [879FMC]
FAILURE CODE [879GKX]
ABNORMAL)
TROUBLESHOOTING FOR FRESH/RECIRC AIR CHANGEOVER
TROUBLESHOOTING USING GAUGE PRESSURE
CONNECTION OF SERVICE TOOL1 topic
  • METHOD FOR CONNECTING SERVICE TOOL
ER PIPINGS
HANDLE COMPRESSOR OIL
CIRCUIT DIAGRAMS
HYDRAULIC CIRCUIT DIAGRAM4 topics
  • SYMBOLS USED IN HYDRAULIC CIRCUIT DIAGRAM
  • HYDRAULIC CIRCUIT DIAGRAM (1/2)
  • HYDRAULIC CIRCUIT DIAGRAM (2/2)
  • HYDRAULIC CIRCUIT DIAGRAM (FOR EUROPEAN UNION)
ELECTRICAL CIRCUIT DIAGRAM10 topics
  • SYMBOLS USED IN ELECTRICAL CIRCUIT DIAGRAM
  • ELECTRICAL CIRCUIT DIAGRAM (1/6)
  • ELECTRICAL CIRCUIT DIAGRAM (2/6)
  • ELECTRICAL CIRCUIT DIAGRAM (3/6)
  • ELECTRICAL CIRCUIT DIAGRAM (4/6)
  • ELECTRICAL CIRCUIT DIAGRAM (5/6)
  • ELECTRICAL CIRCUIT DIAGRAM (6/6)
  • ELECTRICAL CIRCUIT DIAGRAM (FOR EUROPEAN UNION) (1/6)
  • ELECTRICAL CIRCUIT DIAGRAM (FOR EUROPEAN UNION) (2/6)
  • ELECTRICAL CIRCUIT DIAGRAM (FOR EUROPEAN UNION) (3/6)
ELECTRICAL CIRCUIT DIAGRAM (FOR EUROPEAN UNION) (4/6)
ELECTRICAL CIRCUIT DIAGRAM (FOR EUROPEAN UNION) (5/6)
ELECTRICAL CIRCUIT DIAGRAM (FOR EUROPEAN UNION) (6/6)

Inside this manual

Real pages from this service manual (1,786 pages). Open the sample pages (PDF, 941 KB)

Sample pages from the Komatsu PC78US-10 Hydraulic Excavator Service Manual: Specifications, Troubleshooting, Diagram, Color page, Color page, Foldout diagram
  • Specifications, page 101: WEIGHT TABLE
  • Troubleshooting, page 614: SYMPTOMS OF FAILURE AND TROUBLESHOOTING NUMBERS
  • Diagram, page 1,208: 48. Remove nut (72) of injector harness (71) from the injector.
  • Color page, page 182: 7: LS valve
  • Color page, page 1,601: HYDRAULIC SYSTEM
  • Foldout diagram, page 1,761: ELECTRICAL CIRCUIT DIAGRAM (1/6)

Other manuals for this machine

Save 10% on 2 manuals, 15% on 3 or more. Other manuals for the PC78US-10 are listed below. Editions cover different serial number ranges: check the serial coverage and tick only the ones that match your machine.

This manual: Service Manual SEN06518-03$179.75
Other manuals for the PC78US-10

Operator's manuals

Details

This is a service manual

Here's how it compares to the other manual types.

This manual

Service manual

Factory repair procedures and technical information such as specifications, troubleshooting, and wiring and hydraulic diagrams, for the models and systems the manual covers. See What's inside for its topics.

Operator's manual

Safe operation, controls, maintenance schedules, lubrication points, inspections, and basic checks. Repair procedures are in the service manual.

Parts manual

Illustrated diagrams with factory part numbers for identifying components and ordering parts. Repair procedures are in the service manual.

Engine service manuals are sometimes sold separately, since certain machine models were offered with more than one engine option.

What it's used for

Factory manual for in-house farm and construction shop use. Straightforward, complete, and easy to follow. It contains the OEM information dealership service departments and parts counters use to diagnose problems, identify components, and perform maintenance or repairs correctly.

Service shops and owner/operators who repair their own equipment

Identifying correct parts and seeing how assemblies come apart and go back together

Keeping equipment running with less downtime

Factory manual, 1,786 pages

Quantity one is the manual described above.

Fast free USA shipping

Ships in 1 business day.

60-day returns

Free if the mistake is ours. A manual ordered in error must come back unopened in its shrink-wrap; you pay return shipping and a 20% restocking fee applies. Return policy

Binder not included

Manuals over about 300 pages may need a standard 3-ring binder, which you can buy locally to keep the pages organized for shop use.

Questions about model, serial number, engine coverage or contents? Contact us before purchasing and we'll help confirm it's the right manual. Please verify the manual type, machine model, serial number range and engine coverage before purchasing: manuals ordered in error carry a 20% restocking fee (return policy).