Komatsu PC270-8, PC270LC-8 Hydraulic Excavator Service Manual
1,071 pages · Publication SEN00420-13
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- Models
- PC270-8, PC270LC-8
- Serial coverage
- 20001 and up
- Manual type
- Service Manual
- Pages
- 1,071
- Publication
- SEN00420-13
- Condition
- Brand new
What's inside
From the manual's own table of contents: 8 sections, 374 entries. See sample pages (PDF, 782 KB)
Index and foreword48 topics
- Shop Manual, contents binder, binder label and tabs
- Index and foreword
- Foreword and general information
- Specification
- Specification and technical data
- Structure, function and maintenance standard
- Engine and cooling system
- Power train
- Undercarriage and frame
- Hydraulic system, Part 1
- Hydraulic system, Part 2
- Hydraulic system, Part 3
- Work equipment
- Cab and its attachments
- Electrical system
- Standard value table
- Standard service value table
- Testing and adjusting
- Testing and adjusting, Part 1
- Testing and adjusting, Part 2
- Testing and adjusting, Part 3
- Troubleshooting
- Failure code table and fuse locations
- General information on troubleshooting
- Troubleshooting by failure code (Display of code), Part 1
- Troubleshooting by failure code (Display of code), Part 2
- Troubleshooting by failure code (Display of code), Part 3
- Troubleshooting by failure code (Display of code), Part 4
- Troubleshooting of electrical system (E-mode)
- Troubleshooting of hydraulic and mechanical system (H-mode)
- Troubleshooting of engine (S-mode)
- Disassembly and assembly
- General information on disassembly and assembly
- Hydraulic system
- Diagrams and drawings
- Hydraulic diagrams and drawings
- Electrical diagrams and drawings
- Composition of shop manual
- Safety notice
- How to read the shop manual
- Explanation of terms for maintenance standard
- Handling of electric equipment and hydraulic component
- Handling of connectors newly used for engines
- How to read electric wire code
- Precautions when carrying out operation
- Method of disassembling and connecting push-pull type coupler
- Standard tightening torque table
- Conversion table
Specification5 topics
- Specification dimension drawings
- Working range diagram
- Specifications
- Weight table
- Table of fuel, coolant and lubricants
Structure, function and maintenance standard34 topics
- Engine related parts
- Radiator, oil cooler, aftercooler and fuel cooler
- Final drive
- Swing machinery
- Swing circle
- Track frame and recoil spring
- Idler
- Carrier roller
- Track roller
- Track shoe
- Hydraulic equipment layout drawing
- Hydraulic tank and filter
- Hydraulic pump
- Pilot oil filter
- Control valve
- CLSS
- Functions and operation by valve
- Swing motor
- Center swivel joint
- Travel motor
- PPC valve
- Valve control
- Solenoid valve
- PPC accumulator
- Return oil filter
- Attachment circuit selector valve
- Hydraulic cylinder
- Dimensions of components
- Air conditioner piping
- Engine control
- Electrical control system
- Monitor system
- Sensor
- KOMTRAX system
Standard value table2 topics
- Standard value table for engine related parts
- Standard value table for chassis related parts
Testing and adjusting37 topics
- Tools for testing, adjusting, and troubleshooting
- Sketch of special tool
- Testing engine speed
- Testing intake air pressure (boost pressure)
- Checking exhaust gas color
- Adjusting valve clearance
- Testing compression pressure
- Testing blow-by pressure
- Testing engine oil pressure
- Handling fuel system parts
- Releasing residual pressure from fuel system
- Testing fuel pressure
- Testing fuel delivery, return and leak amount
- Bleeding air from fuel circuit
- Checking fuel circuit for leakage
- Checking and adjusting air conditioner compressor belt tension
- Replacing fan belt
- Testing swing circle bearing clearance
- Checking and adjusting track shoe tension
- Testing and adjusting oil pressure in work equipment, swing, and travel circuits
- Testing control circuit basic pressure
- Testing and adjusting oil pressure in pump PC control circuit
- Testing and adjusting oil pressure in pump LS control circuit
- Testing solenoid valve output pressure
- Testing PPC valve output pressure
- Adjusting play of work equipment and swing PPC valves
- Checking parts which cause hydraulic drift of work equipment
- Releasing residual pressure from hydraulic circuit
- Testing oil leakage
- Bleeding air from each part
- Checking cab tipping stopper
- Installation and adjustment of mirrors
- Special functions of machine monitor
- Handling voltage circuit of engine controller
- Preparation work for troubleshooting of electrical system
- Procedure for testing diodes
- Pm Clinic service
Troubleshooting191 topics
- Failure codes table
- Fuse locations
- Points to remember when troubleshooting
- Sequence of events in troubleshooting
- Check before troubleshooting
- Classification and procedures for troubleshooting
- Information in troubleshooting table
- Connection table for connector pin numbers
- T- branch box and T- branch adapter table
- Failure code [989L00] Engine Controller Lock Caution 1
- Failure code [989M00] Engine Controller Lock Caution 2
- Failure code [989N00] Engine Controller Lock Caution 3
- Failure code [AA10NX] Air Cleaner Clogging
- Failure code [AB00KE] Charge Voltage Low
- Failure code [B@BAZG] Eng Oil Press. Low
- Failure code [B@BAZK] Eng Oil Level Low
- Failure code [B@BCNS] Eng Water Overheat
- Failure code [B@BCZK] Eng Water Level Low
- Failure code [B@HANS] Hydr Oil Overheat
- Failure code [CA111] EMC Critical Internal Failure
- Failure code [CA115] Eng Ne and Bkup Speed Sens Error
- Failure code [CA122] Chg Air Press Sensor High Error
- Failure code [CA123] Chg Air Press Sensor Low Error
- Failure code [CA131] Throttle Sensor High Error
- Failure code [CA132] Throttle Sensor Low Error
- Failure code [CA144] Coolant Temp Sens High Error
- Failure code [CA145] Coolant Temp Sens Low Error
- Failure code [CA153] Chg Air Temp Sensor High Error
- Failure code [CA154] Chg Air Temp Sensor Low Error
- Failure code [CA155] Chg Air Temp High Speed Derate
- Failure code [CA187] Sens Supply 2 Volt Low Error
- Failure code [CA221] Ambient Press Sens High Error
- Failure code [CA222] Ambient Press Sens Low Error
- Failure code [CA227] Sens Supply 2 Volt High Error
- Failure code [CA234] Eng Overspeed
- Failure code [CA238] Ne Speed Sens Supply Volt Error
- Failure code [CA271] IMV/PCV1 Short Error
- Failure code [CA272] IMV/PCV1 Open Error
- Failure code [CA322] Inj #1 Open/Short Error
- Failure code [CA323] Inj #5 Open/Short Error
- Failure code [CA324] Inj #3 Open/Short Error
- Failure code [CA325] Inj #6 Open/Short Error
- Failure code [CA331] Inj #2 Open/Short Error
- Failure code [CA332] Inj #4 Open/Short Error
- Failure code [CA342] Calibration Code Incompatibility
- Failure code [CA351] Injectors Drive Circuit Error
- Failure code [CA352] Sens Supply 1 Volt Low Error
- Failure code [CA386] Sens Supply 1 Volt High Error
- Failure code [CA428] Water in Fuel Sensor High Error
- Failure code [CA429] Water in Fuel Sensor Low Error
- Failure code [CA435] Eng Oil Press Sw Error
- Failure code [CA441] Battery Voltage Low Error
- Failure code [CA442] Battery Voltage High Error
- Failure code [CA449] Rail Press Very High Error
- Failure code [CA451] Rail Press Sensor High Error
- Failure code [CA452] Rail Press Sensor Low Error
- Failure code [CA488] Chg Air Temp High Torque Derate
- Failure code [CA553] Rail Press High Error
- Failure code [CA559] Rail Press Low Error
- Failure code [CA689] Eng Ne Speed Sensor Error
- Failure code [CA731] Eng Bkup Speed Sens Phase Error
- Failure code [CA757] All Continuous Data Lost Error
- Failure code [CA778] Eng Bkup Speed Sensor Error
- Failure code [CA1633] KOMNET Datalink Timeout Error
- Failure code [CA2185] Throt Sens Sup Volt High Error
- Failure code [CA2186] Throt Sens Sup Volt Low Error
- Failure code [CA2249] Rail Press Very Low Error
- Failure code [CA2311] IMV Solenoid Error
- Failure code [CA2555] Grid Htr Relay Volt High Error
- Failure code [CA2556] Grid Htr Relay Volt Low Error
- Failure code [D19JKZ] Personal Code Relay Abnormality
- Failure code [D862KA] GPS Antenna Discon
- Failure code [DA22KK] Pump Solenoid Power Low Error
- Failure code [DA25KP] 5V Sensor 1 Power Abnormality
- Failure code [DA29KQ] Model Selection Abnormality
- Failure code [DA2RMC] CAN Discon (Pump Con Detected)
- Failure code [DAF8KB] Short circuit in camera power supply
- Failure code [DAFGMC] GPS Module Error
- Failure code [DAFRMC] CAN Discon (Monitor Detected)
- Failure code [DGH2KB] Hydr Oil Sensor Short
- Failure code [DHPAMA] F Pump Press Sensor Abnormality
- Failure code [DHPBMA] R Pump Press Sensor Abnormality
- Failure code [DHS3MA] Arm Curl PPC Press Sensor Abnormality
- Failure code [DHS4MA] Bucket Curl PPC Press Sensor Abnormality
- Failure code [DHS8MA] Boom Raise PPC Press Sensor Abnormality
- Failure code [DHSAMA] Swing RH PPC Press Sensor Abnormality
- Failure code [DHSBMA] Swing LH PPC Press Sensor Abnormality
- Failure code [DHSDMA] Bucket Dump PPC Press Sensor Abnormality
- Failure code [DHX1MA] Overload Sensor Abnormality (Analog)
- Failure code [DW43KA] Travel Speed Sol Discon
- Failure code [DW43KB] Travel Speed Sol Short
- Failure code [DW45KA] Swing Brake Sol Discon
- Failure code [DW45KB] Swing Brake Sol Short
- Failure code [DW91KA] Travel Junction Sol Discon
- Failure code [DW91KB] Travel Junction Sol Short
- Failure code [DWA2KA] Service Sol Discon
- Failure code [DWA2KB] Service Sol Short
- Failure code [DWK0KA] 2-stage Relief Sol Discon
- Failure code [DWK0KB] 2-stage Relief Sol Short
- Failure code [DXA8KA] PC-EPC (F) Sol Discon
- Failure code [DXA8KB] PC-EPC (F) Sol Short
- Failure code [DXA9KA] PC-EPC (R) Sol Discon
- Failure code [DXA9KB] PC-EPC (R) Sol Short
- Failure code [DXE0KA] LS-EPC Sol Discon
- Failure code [DXE0KB] LS-EPC Sol Short
- Failure code [DXE4KA] Service Current EPC Discon
- Failure code [DXE4KB] Service Current EPC Short
- Failure code [DXE5KA] Merge-divider Main Sol Discon
- Failure code [DXE5KB] Merge-divider Main Sol Short
- Failure code [DXE6KA] Merge-divider LS Sol Discon
- Failure code [DXE6KB] Merge-divider LS Sol Short
- Failure code [DY20KA] Wiper Working Abnormality
- Failure code [DY20MA] Wiper Parking Abnormality
- Failure code [DY2CKA] Washer Drive Discon
- Failure code [DY2CKB] Washer Drive Short
- Failure code [DY2DKB] Wiper Drive (For) Short
- Failure code [DY2EKB] Wiper Drive (Rev) Short
- Before carrying out troubleshooting of electrical system
- E-1 When starting switch turned ON, machine monitor displays nothing
- E-2 When starting switch turned ON (before starting engine), basic check item lights up
- E-3 Engine does not start (Engine does not crank)
- E-4 Preheater does not operate
- E-5 Automatic warm-up system does not operate (in cold season)
- E-6 All work equipment, swing, and travel mechanism do not move or cannot be locked
- E-7 Precaution lights up while engine is running
- E-8 Emergency stop item lights up while engine is running
- E-9 Engine coolant temperature gauge does not indicate normally
- E-10 Hydraulic oil temperature gauge does not indicate correctly
- E-11 Fuel level gauge does not indicate correctly
- E-12 Contents of display by machine monitor are different from applicable machine
- E-13 Machine monitor does not display some items
- E-14 Function switch does not work
- E-15 Auto-decelerator does not operate normally
- E-16 Working mode does not change
- E-17 Travel speed does not change
- E-18 Alarm buzzer cannot be stopped
- E-19 Windshield wiper and window washer do not operate
- E-20 Power maximizing function does not operate normally
- E-21 Swing holding brake does not operate normally
- E-22 Travel alarm does not sound or does not stop sounding
- E-24 While starting switch is in OFF position, service meter is not displayed
- E-25 Machine monitor cannot be set in service mode
- E-26 Monitoring function does not display lever control signal normally
- E-27 KOMTRAX system does not operate normally
- System diagram of hydraulic and mechanical system
- H-1 Speed or power of whole work equipment, swing, and travel is low
- H-2 Engine speed lowers extremely or engine stalls
- H-3 Work equipment, swing, and travel systems do not work
- H-4 Abnormal sound comes out from around hydraulic pump
- H-5 Auto-decelerator does not operate
- H-6 Fine control performance or response is low
- H-7 Speed or power of boom is low
- H-8 Speed or power of arm is low
- H-9 Speed or power of bucket is low
- H-10 Work equipment does not move singly
- H-11 Hydraulic drift of work equipment is large
- H-12 Time lag of work equipment is large
- H-14 Power maximizing function does not work
- H-15 In compound operation of work equipment, speed of part loaded more is low
- H-16 When machine swings and raises boom simultaneously, boom rising speed is low
- H-17 When machine swings and travels simultaneously, travel speed is low
- H-18 Machine deviates during travel
- H-19 Travel speed is low
- H-20 Machine is not steered well or steering power is low
- H-21 Travel speed does not change or travel speed is low/high
- H-22 Travel system does not move (only one side)
- H-23 Upper structure does not swing
- H-24 Swing acceleration or swing speed is low
- H-25 Upper structure overruns remarkably when it stops swinging
- H-26 Large shock is made when upper structure stops swinging
- H-27 Large sound is made when upper structure stops swinging
- H-28 Hydraulic drift of swing is large
- H-29 Attachment circuit is not changed
- H-30 Oil flow in attachment circuit cannot be controlled
- Method of using troubleshooting chart
- S-1 Starting performance is poor
- S-2 Engine does not start
- S-3 Engine does not pick up smoothly
- S-4 Engine stops during operations
- S-5 Engine does not rotate smoothly
- S-6 Engine lack output (or lacks power)
- S-7 Exhaust smoke is black (incomplete combustion)
- S-8 Oil consumption is excessive (or exhaust smoke is blue)
- S-9 Oil becomes contaminated quickly
- S-10 Fuel consumption is excessive
- S-11 Oil is in coolant (or coolant spurts back or coolant level goes down)
- S-12 Oil pressure drops
- S-13 Oil level rises (Entry of coolant/fuel)
- S-14 Coolant temperature becomes too high (overheating)
- S-15 Abnormal noise is made
- S-16 Vibration is excessive
Disassembly and assembly46 topics
- How to read this manual
- Coating materials list
- Special tools list
- Sketches of special tools
- Removal and installation of fuel supply pump assembly
- Removal and installation of fuel injector assembly
- Removal and installation of engine front seal
- Removal and installation of engine rear seal
- Removal and installation of cylinder head assembly
- Removal and installation of radiator assembly
- Removal and installation of hydraulic oil cooler assembly
- Removal and installation of aftercooler assembly
- Removal and installation of fuel cooler assembly
- Removal and installation of engine and hydraulic pump assembly
- Removal and installation of final drive assembly
- Disassembly and assembly of final drive assembly
- Removal and installation of swing motor and swing machinery assembly
- Disassembly and assembly of swing motor and swing machinery assembly
- Removal and installation of swing circle assembly
- Disassembly and assembly of carrier roller assembly
- Disassembly and assembly of track roller assembly
- Disassembly and assembly of idler assembly
- Disassembly and assembly of recoil spring assembly
- Removal and installation of sprocket
- Expansion and installation of track shoe assembly
- Removal and installation of revolving frame assembly
- Removal and installation of counterweight assembly
- Removal and installation of center swivel joint assembly
- Disassembly and assembly of center swivel joint assembly
- Removal and installation of hydraulic tank assembly
- Removal and installation of control valve assembly
- Disassembly and assembly of control valve assembly
- Removal and installation of hydraulic pump assembly
- Removal and installation of oil seal in hydraulic pump input shaft
- Disassembly and assembly of work equipment PPC valve assembly
- Disassembly and assembly of travel PPC valve assembly
- Disassembly and assembly of hydraulic cylinder assembly
- Removal and installation of work equipment assembly
- Removal and installation of operator's cab assembly
- Removal and installation of operator cab glass (stuck glass)
- Removal and installation of front window assembly
- Removal and installation of floor frame assembly
- Removal and installation of air conditioner unit assembly
- Removal and installation of KOMTRAX communication modem assembly
- Removal and installation of monitor assembly
- Removal and installation of pump controller assembly
Diagrams and drawings3 topics
- Hydraulic circuit diagram PC270, 270LC-8
- Electrical circuit diagram
- Connector arrangement diagram
Inside this manual
Real pages from this service manual (1,071 pages). Open the sample pages (PDF, 781 KB)
- Specifications, page 61: 01 Specification
- Troubleshooting, page 541: Failure code [B@BAZG] Eng Oil Press. Low
- Diagram, page 701: Failure code [DWA2KA] Service Sol Discon
- Foldout diagram, page 1,064: Electrical circuit diagram (1/5)
Other manuals for this machine
Save 10% on 2 manuals, 15% on 3 or more. Other manuals for the PC270LC-8 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.
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, 1,071 pages
Quantity one is the manual described above.
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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.
Other editions and similar models
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).