Komatsu HM300-1L Articulated Truck Service Manual
1,237 pages · Publication CEBM015200
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- Models
- HM300-1L
- Serial coverage
- A10001 and up
- Manual type
- Service Manual
- Pages
- 1,237
- Publication
- CEBM015200
- Condition
- Brand new

What's inside
From the manual's own table of contents: 5 sections, 366 entries. See sample pages (PDF, 653 KB)
FOREWORD5 topics
- GENERAL
- STRUCTURE AND FUNCTION
- TESTING, ADJUSTING AND TROUBLESHOOTING
- DISASSEMBLY AND ASSEMBLY
- DIAGRAMS AND SCHEMATICS
STRUCTURE AND FUNCTION93 topics
- FINAL DRIVE SYSTEM
- FRONT
- CENTER
- REAR
- STEERING COLUMN
- WHEEL BRAKING SYSTEM
- PIPING DIAGRAM
- BRAKE VALVE
- ACCUMULATOR CHARGE VALVE
- ACCUMULATOR
- SLACK ADJUSTER
- FRONT BRAKE
- CENTER, REAR BRAKE
- PROPORTIONAL REDUCING VALVE
- BRAKE SYSTEM TANK
- PARKING BRAKE
- PARKING BRAKE CALIPER
- SPRING CYLINDER
- PARKING BRAKE SOLENOID
- SUSPENSION SYSTEM
- SUSPENSION CYLINDER
- OSCILLATION HITCH JOINT
- STEERING, HOIST OIL PIPING DIAGRAM
- DUMP BODY CONTROL
- HYDRAULIC TANK AND FILTER
- FLOW AMPLIFIER VALVE
- STEERING VALVE
- HAND PUMP AND SLEEVE CONNECTION
- FUNCTION OF CENTER SPRING
- STEERING CYLINDER
- HOIST VALVE
- HOIST VALVE AT HOLD POSITION
- HOIST VALVE AT RAISE POSITION
- HOIST VALVE AT FLOAT POSITION
- HOIST VALVE AT LOWER POSITION
- EPC VALVE
- PILOT CHECK VALVE
- HOIST CYLINDER
- HYDRAULIC PUMP
- STEERING, HOIST + PILOT PUMP
- TRANSMISSION + FRONT BRAKE COOLING PUMP
- BRAKE COOLING + BRAKE PUMP
- AUXILIARY STEERING PUMP
- CAB TILT SYSTEM VIEW
- AIR CONDITIONING SYSTEM VIEW
- AIR CONDITIONER UNIT
- RECEIVER DRYER
- CONDENSER
- REFRIGERANT COMPRESSOR
- MACHINE MONITOR SYSTEM
- NETWORK DATA
- MACHINE MONITOR PANEL
- OPTION SETTING CONNECTOR DIAGRAM
- ADJUSTING MACHINE MONITOR
- MACHINE MONITOR NORMAL DISPLAY FUNCTIONS
- SELF-DIAGNOSTIC FUNCTION WHEN OPERATING IGNITION SWITCH
- CHECK FUNCTION OF MONITOR LAMPS AND METERS
- SERVICE METER DISPLAY
- ODOMETER
- SERVICE MODE
- OPERATION METHOD
- AUTOMATIC SHIFT CONTROL SYSTEM
- TRANSMISSION CONTROLLER
- SHIFT LEVER POSITION AND AUTOMATIC GEAR SHIFTING RANGE
- GEAR SHIFTING CHARACTERISTICS
- AUTOMATIC GEAR SHIFTING GRAPH
- GEARSHIFT LEVER POSITIONS AND SHIFTING METHOD
- SHIFT HOLD FUNCTION
- GEAR SHIFTING TIME DELAY
- SAFETY FUNCTIONS
- SELF-DIAGNOSTIC FUNCTION
- EMERGENCY STEERING SYSTEM
- SENSORS AND SWITCHES
- ENGINE SPEED SENSOR
- ACCELERATOR PEDAL SENSOR
- ENGINE COOLANT / COOLING OIL TEMPERATURE SENSORS
- STEERING OIL TEMPERATURE SENSOR
- FUEL LEVEL SENSOR
- TILT SENSOR
- AIR CLEANER CLOGGING SENSOR
- HYDRAULIC OIL LEVEL SENSOR
- BODY POSITIONER SENSOR
- RETARDER CONTROL SYSTEM
- RETARDER CONTROLLER UNIT
- RETARDER CONTROL FUNCTION
- HOIST CONTROL FUNCTION
- DIFFERENTIAL LOCK CONTROL FUNCTION
- BRAKE CONTROL SYSTEM (E-SPEC)
- BRAKE CONTROLLER (E-SPEC) UNIT
- BRAKE CONTROL FUNCTION
- HOIST CONTROL SYSTEM
- DIFFERENTIAL LOCK CONTROL SYSTEM
- DUMP CONTROL LEVER
TESTING AND ADJUSTING35 topics
- CHECKING BRAKE PAD
- ADJUSTING PAD CLEARANCE
- RELEASING EMERGENCY PARKING BRAKE
- STEERING CIRCUIT PRESSURE
- MEASURING STEERING RELIEF OIL PRESSURE
- ADJUSTING STEERING RELIEF OIL PRESSURE
- CHECKING CYLINDER LENGTH
- RELEASING NITROGEN GAS
- ADJUSTING OIL LEVEL
- CHARGING WITH NITROGEN GAS
- ADJUSTING CYLINDER LENGTH
- TILTING THE CAB
- PREPARATORY WORK
- TILTING CAB UP
- USING EXTERNAL CRANE
- HOLDING CAB IN POSITION
- LOWERING CAB DOWN
- DUMP CIRCUIT PRESSURE
- TESTING DUMP MAIN RELIEF OIL PRESSURE
- ADJUSTING DUMP MAIN RELIEF OIL PRESSURE
- MEASURING DUMP PILOT RELIEF OIL PRESSURE
- ADJUSTING DUMP PILOT RELIEF OIL PRESSURE
- CHECKING SENSOR OUTPUT/INPUT VOLTAGE
- ADJUSTING LINK LENGTH
- CALIBRATING SYSTEM
- HANDLING ENGINE CONTROLLER HIGH-VOLTAGE CIRCUIT
- SETTING ROTARY SWITCH
- ADJUSTING TRANSMISSION
- ESCAPE METHOD FOR ELECTRICAL SYSTEM
- MACHINE MONITOR
- FUNCTIONS OF MACHINE MONITOR
- NORMAL AND THE SPECIAL FUNCTIONS OF MACHINE MONITOR
- FLOW OF MODES AND FUNCTIONs
- OPERATION AND DISPLAYS FOR OPERATOR MODE
- SWITCHING TO SERVICE MODE AND SCREEN DISPLAY
TROUBLESHOOTING208 topics
- (ENG-24) FAILURE CODE [D182KZ]
- OPEN OR SHORT CIRCUIT IN PRE-HEATING RELAY COIL (KZ)
- (ENG-25) FAILURE CODE [D1D0KB]
- SHORT CIRCUIT IN VOLTAGE LOAD POWER SUPPLY (KB)
- (ENG-26) FAILURE CODE [D5ZAKX]
- ENGINE THROTTLE INPUT SIGNAL OUT OF RANGE (KX)
- (ENG-27) FAILURE CODE [DB20KT]
- CONTROLLER POWER SUPPLY (KT) VOLTAGE IS LOW
- (ENG-28) FAILURE CODE [DB22KK]
- DROP IN VOLTAGE LOAD POWER SUPPLY (KK)
- (ENG-29) FAILURE CODE [DB29KQ]
- CONTROLLER WIRING HARNESS (KQ)
- (ENG-30) FAILURE CODE [DB2AMA]
- Q” ADJUSTMENT FOR ENGINE CONTROLLER NOT SET PROPERLY (MA)
- (ENG-31) FAILURE CODE [KK11KB]
- TROUBLE IN INPUT OF ignition switch C (KB)
- (ENG-32) FAILURE CODE [DDA1L5]
- TROUBLE IN THROTTLE (ACCELERATION) SENSOR SYSTEM (L5)
- (ENG-33) FAILURE CODE [DDE2L6]
- ENGINE OIL PRESSURE DROP (L6)
- (ENG-34) FAILURE CODE [DGE2KX]
- COOLANT TEMPERATURE (HIGH) SENSOR OUT OF RANGE (KX)
- (ENG-35) FAILURE CODE [DGE3LC]
- COOLANT TEMPERATURE (LOW) SENSOR OUT OF RANGE (L6)
- (ENG-36) FAILURE CODE [DGE4KX]
- TROUBLE IN FUEL TEMPERATURE SENSOR SYSTEM (KX)
- (ENG-37) FAILURE CODE [DH30KX]
- TROUBLE IN BOOST PRESSURE SENSOR SYSTEM (KX)
- (ENG-38) FAILURE CODE [DH40KX]
- TROUBLE IN COMMON RAIL FUEL PRESSURE SENSOR SYSTEM (KX)
- (ENG-39) FAILURE CODE [DK10KX]
- TROUBLE IN THROTTLE (ACCELERATION) SENSOR SYSTEM (KX)
- (ENG-40) FAILURE CODE [DLE3LC]
- TROUBLE IN ENGINE NE SPEED SENSOR SYSTEM
- (ENG-41) FAILURE CODE [DLE1LC]
- TROUBLE IN ENGINE G SPEED SENSOR SYSTEM (LC)
- (ENG-42) NO FAILURE CODE DISPLAYED
- ENGINE DOES NOT CRANK
- ECMV “1ST” CLUTCH NOT DISENGAGING (L1)
- (TM-17) FAILURE CODE [15SEMA]
- ECMV “1ST” CLUTCH NOT ENGAGING (MA)
- (TM-18) FAILURE CODE [15SFL1]
- ECMV “2ND” CLUTCH NOT DISENGAGING (L1)
- (TM-19) FAILURE CODE [15SFMA]
- ECMV “2ND” CLUTCH NOT ENGAGING (MA)
- (TM-20) FAILURE CODE [15SGL1]
- ECMV “3RD” CLUTCH NOT DISENGAGING (L1)
- (TM-21) FAILURE CODE [15SGMA]
- ECMV “3RD” CLUTCH NOT ENGAGING (MA)
- (TM-22) FAILURE CODE [15SJL1]
- ECMV “LOCK-UP” CLUTCH NOT DISENGAGING (l1)
- (TM-23) FAILURE CODE [15SJMA]
- ECMV “LOCK-UP” CLUTCH NOT ENGAGING (MA)
- (TM-24) FAILURE CODE [15SKL1]
- ECMV “INTER-AXLE” CLUTCH NOT DISENGAGING (L1)
- (TM-25) FAILURE CODE [15SKMA]
- ECMV “INTER-AXLE” CLUTCH NOT ENGAGING (MA)
- (TM-26) FAILURE CODE [2B61MW]
- ECMV “INTER-AXLE” CLUTCH SLIPPING (MW)
- (TM-27) FAILURE CODE [2F00KM]
- PARKING BRAKE SYSTEM INDICATING FAILURE (KM)
- HYDRAULIC TANK FILTER CLOGGED (NX)
- POSSIBLE ENGINE OVER SPEED CONDITION (00)
- (TM-30) FAILURE CODE [989AKZ]
- OPEN OR SHORT IN ENGINE OVER SPEED COMMAND SIGNAL (KZ)
- REAR OVERTURN SIGNAL OUT OF RANGE (00)
- (TM-32)FAILURE CODE [AA10NX]
- AIR CLEANER CLOG INDICATION (NX)
- (TM-33) FAILURE CODE [AB00MA]
- ALTERNATOR NOT CHARGING PROPERLY (MA)
- (TM-34) FAILURE CODE [B@BCZK]
- COOLANT LEVEL INDICATING A LOW LEVEL CONDITION (ZK)
- (TM-35) FAILURE CODE [B@HAZK]
- LOW HYDRAULIC TANK OIL LEVEL INDICATED (ZK)
- (TM-36) FAILURE CODE [B@JANS]
- STEERING OIL OVERHEAT CONDITION INDICATED (ZK)
- (TM-37) FAILURE CODE [D1B0KZ]
- POSSIBLE SHORT OR OPEN IN TRANSMISSION CUT RELAY SYSTEM (KZ)
- (TM-38) FAILURE CODE [D5ZBKX]
- DIFFERENTIAL LOCK CIRCUIT SIGNAL INCORRECT (KX)
- (TM-39) FAILURE CODE [D5ZCKZ]
- OPEN OR SHORT IN EXHAUST BRAKE COMMAND SIGNAL (KZ)
- (TM-40) FAILURE CODE [DF10KA]
- FORCED NEUTRAL DEMAND SIGNAL (L4)
- (TM-41) FAILURE CODE [D5ZEKX]
- ENGINE LOAD SIGNAL OUT OF RANGE (KX)
- (TM-42) FAILURE CODE [DAQ0KK]
- TRANSMISSION CONTROLLER DROP IN POWER SOURCE (KK)
- (TM-43) FAILURE CODE [DAQ1KK]
- (TM-44) FAILURE CODE [DAQ2KK]
- POSSIBLE SHORT OR OPEN IN TRANSMISSION VOLTAGE SYSTEM (KK)
- (TM-45) FAILURE CODE [DAQ3KK]
- (TM-46) FAILURE CODE [DAQ5KP]
- TRANSMISSION CONTROLLER SIGNAL OUT OF RANGE (KP)
- (TM-47) FAILURE CODE [DAQ9KM]
- MISTAKEN OPERATION SETTING (KP)
- (TM-48) FAILURE CODE [DAQ9KM]
- NO MATCH IN MODEL SELECTION SIGNAL (KP)
- (TM-49) FAILURE CODE [DAQAKQ]
- TRANSMISSION CONTROLLER ROTARY SWITCH
- (TM-50) FAILURE CODE [DAQSMA]
- TRANSMISSION FUNCTION INOPERABLE
- (TM-51) FAILURE CODE [DDTFKA]
- LOCK-UP” CLUTCH FILL SWITCH SYSTEM OPEN OR SHORTED (KA)
- (TM-52) FAILURE CODE [DDTFKA]
- (TM-53) FAILURE CODE [DDTHKA]
- HI” CLUTCH SYSTEM OPEN OR SHORTED (KA)
- (TM-54) FAILURE CODE [DDTJKA]
- LO” CLUTCH SYSTEM OPEN OR SHORTED (KA)
- (TM-55) FAILURE CODE [DDTKKA]
- 1ST CLUTCH SYSTEM OPEN OR SHORTED (KA)
- (TM-56) FAILURE CODE [DDTLKA]
- 2ND CLUTCH SYSTEM OPEN OR SHORTED (KA)
- (TM-57) FAILURE CODE [DDTMKA]
- 3RD CLUTCH SYSTEM OPEN OR SHORTED (KA)
- (TM-58) FAILURE CODE [DDTNKA]
- R” CLUTCH SYSTEM OPEN OR SHORTED (KA)
- (TM-59) FAILURE CODE [DF10KA]
- POSSIBLE OPEN OR SHORT IN GEAR SHIFT LEVER SYSTEM (KA)
- (TM-60) FAILURE CODE [DF10KB]
- (TM-61) FAILURE CODE [DGF1KX]
- TRANSMISSION OIL TEMPERATURE SENSOR OUT OF RANGE (KX)
- (TM-63) FAILURE CODE [DGR3L8]
- CENTER BRAKE OIL TEMPERATURE SENSOR OUT OF RANGE (L8)
- (TM-64) FAILURE CODE [DGR4L8]
- FRONT BRAKE OIL TEMPERATURE SENSOR OUT OF RANGE (L8)
- (TM-65) FAILURE CODE [DGT1LX]
- TORQUE CONVERTER TEMPERATURE SENSOR OUT OF RANGE (KX)
- (TM-66) FAILURE CODE [DHT5KX]
- TORQUE CONVERTER OIL PRESSURE SENSOR OUT OF RANGE (KX)
- (TM-67) FAILURE CODE [DHT5L6]
- TORQUE CONVERTER OIL PRESSURE SENSOR OUT OF RANGE (L6)
- (TM-68) FAILURE CODE [DJF1KA]
- FUEL LEVEL SENSOR OUT OF RANGE (L6)
- (TM-69) FAILURE CODE [DK11KX]
- THROTTLE ANGLE SENSOR OUT OF RANGE (KX)
- (TM-70) FAILURE CODE [DLE2KA]
- ENGINE SPEED SENSOR OPEN OR SHORTED (KA)
- (TM-71) FAILURE CODE [DLE2LC]
- ENGINE SPEED SENSOR OPEN OR SHORTED (LC)
- (TM-72) FAILURE CODE [DLF1KA]
- TRANSMISSION INPUT SHAFT SPEED SENSOR OPEN OR SHORTED (KA)
- (TM-73) FAILURE CODE [DLF1LC]
- TRANSMISSION INPUT SHAFT SPEED SENSOR OPEN OR SHORTED (LC)
- (TM-74) FAILURE CODE [DLF2KA]
- TRANSMISSION INTERMEDIATE SHAFT SPEED SENSOR OPEN OR SHORTED (KA)
- (TM-75) FAILURE CODE [DLF2LC]
- TRANSMISSION INTERMEDIATE SHAFT SPEED SENSOR OPEN OR SHORTED (LC)
- (TM-76) FAILURE CODE [DLT3KA]
- TRANSMISSION OUTPUT SHAFT SPEED SENSOR OPEN OR SHORTED (KA)
- (TM-77) FAILURE CODE [DLT3LC]
- TRANSMISSION OUTPUT SHAFT SPEED SENSOR OPEN OR SHORTED (LC)
- (TM-78) FAILURE CODE [DXH0KA]
- INNER AXLE DIFFERENTIAL LOCK SYSTEM OPEN OR SHORTED (KA)
- (TM-79) FAILURE CODE [DXH0KB]
- INNER AXLE DIFFERENTIAL LOCK SYSTEM OPEN OR SHORTED (KB)
- (TM-80) FAILURE CODE [DXH1KA]
- LOCK-UP CLUTCH SYSTEM OPEN OR SHORTED (KA)
- (TM-81) FAILURE CODE [DXH1KB]
- LOCK-UP CLUTCH SYSTEM OPEN OR SHORTED (KB)
- (TM-82) FAILURE CODE [DXH2KA]
- HIGH CLUTCH SYSTEM OPEN OR SHORTED (KA)
- (TM-83) FAILURE CODE [DXH2KB]
- HIGH CLUTCH SYSTEM OPEN OR SHORTED (KB)
- (TM-84) FAILURE CODE [DXH3KA]
- LOW CLUTCH SYSTEM OPEN OR SHORTED (KA)
- (TM-85) FAILURE CODE [DXH3KB]
- LOW CLUTCH SYSTEM OPEN OR SHORTED (KB)
- (TM-86) FAILURE CODE [DXH4KA]
- (TM-87) FAILURE CODE [DXH4KB]
- 1ST CLUTCH SYSTEM OPEN OR SHORTED (KB)
- (TM-88) FAILURE CODE [DXH5KA]
- (TM-89) FAILURE CODE [DXH5KB]
- 2ND CLUTCH SYSTEM OPEN OR SHORTED (KB)
- (TM-90) FAILURE CODE [DXH6KA]
- 3RD CLUTCH SYSTEM OPEN OR SHORTED (KB)
- (TM-91) FAILURE CODE [DXH6KB]
- (TM-92) FAILURE CODE [DXH7KA]
- REVERSE CLUTCH SYSTEM OPEN OR SHORTED (KA)
- (TM-93) FAILURE CODE [DXH7KB]
- REVERSE CLUTCH SYSTEM OPEN OR SHORTED (KB)
- (TM-94) NO FAILURE CODE DISPLAYED
- BACK-UP LIGHTS AND ALARM DO NOT OPERATE
- (BK-20) FAILURE CODE [DW71KZ]
- EXHAUST BRAKE SOLENOID OPEN OR SHORTED (KZ)
- (BK-21) FAILURE CODE [DK72KX]
- DUMP LEVER INPUT SIGNAL OUT OF RANGE (KZ)
- (BK-22) FAILURE CODE [DW73KZ]
- DUMP SELECTOR VALVE OPEN OR SHORTED (KZ)
- (BK-23) FAILURE CODE [DX11KA]
- REAR BRAKE PRESSURE REDUCING SOLENOID OPEN OR SHORTED (KA)
- (BK-24) FAILURE CODE [DX11KB]
- REAR BRAKE PRESSURE REDUCING SOLENOID OPEN OR SHORTED (KB)
- (BK-25) FAILURE CODE [DX11KY]
- REAR BRAKE PRESSURE REDUCING SOLENOID OPEN OR SHORTED (KY)
- (BK-26) FAILURE CODE [DX12KA]
- FRONT BRAKE PRESSURE REDUCING SOLENOID OPEN OR SHORTED (KA)
- (BK-27) FAILURE CODE [DX12KB]
- FRONT BRAKE PRESSURE REDUCING SOLENOID OPEN OR SHORTED (KB)
- (BK-28) FAILURE CODE [DX12KY]
- (BK-29) FAILURE CODE [DX13KA]
- DUMP EPC VALVE SOLENOID OPEN OR SHORTED (KA)
- (BK-30) FAILURE CODE [DX13KB]
- DUMP EPC VALVE SOLENOID OPEN OR SHORTED (KB)
- (BK-31) FAILURE CODE [DX13KY]
- DUMP EPC VALVE SOLENOID OPEN OR SHORTED (KY)
- (BK-32) NO FAILURE CODE DISPLAYED
- PARKING BRAKE SYSTEM FAILURE
DISASSEMBLY AND ASSEMBLY20 topics
- INSTALLATION
- DISASSEMBLY
- ASSEMBLY
- REAR AXLE AND DIFFERENTIAL
- AXLE ASSEMBLY
- REMOVAL
- DIFFERENTIAL ASSEMBLY
- FRONT FINAL DRIVE AND BRAKE ASSEMBLY
- CENTER FINAL DRIVE AND BRAKE ASSEMBLY
- REAR FINAL DRIVE AND BRAKE ASSEMBLY
- FRONT SUSPENSION
- REAR SUSPENSION
- EQUALIZER BEAM
- HITCH FRAME SYSTEM
- ORBITAL STEERING UNIT
- UNIT BREAKDOWN VIEW
- FLOW AMP VALVE
- HYDRAULIC CYLINDER
- TRUCK BODY ASSEMBLY
- OPERATOR’S SEAT
Inside this manual
Real pages from this service manual (1,237 pages). Open the sample pages (PDF, 652 KB)
- Troubleshooting, page 451: (ENG-24) FAILURE CODE [D182KZ]
- Diagram, page 812: (MON-7) FAILURE CODE [DAQSKR]
- Specifications, page 1,021: TRANSMISSION AND FRONT DIFFERENTIAL
- Foldout diagram: OTHERS
Other manuals for this machine
Save 10% on 2 manuals, 15% on 3 or more. Other manuals for the HM300-1L are listed below. Editions cover different serial number ranges: check the serial coverage and tick only the ones that match your machine.
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This is a service manual
Here's how it compares to the other manual types.
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, 1,237 pages
Quantity one is the manual described above.
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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).