Komatsu PC300-7, PC300LC-7, PC350-7, PC350LC-7 Hydraulic Excavator Service Repair Workshop Manual (SN:40001 and up, 200

HYDRAULIC EXCAVATOR SEN03537-03 PC300 -7E0 PC300LC -7E0 PC350 -7E0 PC350LC -7E0 SERIAL NUMBERS PC300,300LC- 50001-50216 PC300,300LC- 55001 and up PC350,350LC- 30001-30093 PC350,350LC- 55001 and up

PC300, 350-7E0 1 SEN03539-03 HYDRAULIC EXCAVATOR 1SHOP MANUAL PC300-7E0 PC300LC-7E0 PC350-7E0 PC350LC-7E0 Machine model Serial number PC300-7E0 50001 – 50216 55001 and up PC300LC-7E0 50001 – 50216 55001 and up PC350-7E0 30001 – 30093 55001 and up PC350LC-7E0 30001 – 30093 55001 and up 00 Index and foreword 1 Index Composition of shop manual .......................................................................................................................... 2 Table of contents ............................................................................................................................................. 4

SEN03539-03 00 Index and foreword 2 PC300, 350-7E0 Composition of shop manual 1 The contents of this shop manual are shown together with Form No. in a list. Note 1: Always keep the latest version of this manual in accordance with this list and utilize accordingly. The marks shown to the right of Form No. denote the following: Q: New issue (to be filed additionally) q: Revision (to be replaced for each Form No.) Note 2: This shop manual can be supplied for each Form No. Note 3: To file this shop manual in the special binder for management, handle it as follows: • Place a divider on the top of each section in the file after matching the Tub No. with No. indicated next to each Section Name shown in the table below: • File overview and other materials in sections in the order shown below and utilize them accordingly. Section Title Form Number Shop Manual, contents binder, binder label and tabs SEN03537-03 00 Index and foreword SEN03538-03 Index SEN03539-03 q Foreword and general information SEN03540-01 01 Specification SEN03541-00 Specification and technical data SEN03542-00 10 Structure, function and maintenance standard SEN03543-02 Engine and cooling system SEN03544-00 Power train SEN03545-00 Undercarriage and frame SEN03546-00 Hydraulic system, Part 1 SEN03547-00 Hydraulic system, Part 2 SEN03548-01 q Hydraulic system, Part 3 SEN03549-00 Work equipment SEN03550-00 Cab and its attachments SEN03551-00 Electrical system SEN03552-02 q 20 Standard value table SEN03553-01 Standard service value table SEN03554-01 30 Testing and adjusting SEN03555-02 Testing and adjusting, Part 1 SEN03556-02 Testing and adjusting, Part 2 SEN03557-01 Testing and adjusting, Part 3 SEN04147-01 40 Troubleshooting SEN03558-03 Failure code table and fuse locations SEN04148-02 q General information on troubleshooting SEN03559-03 q Troubleshooting by failure code (Display of code), Part 1 SEN03560-02 q Troubleshooting by failure code (Display of code), Part 2 SEN03561-01 Troubleshooting by failure code (Display of code), Part 3 SEN03562-01 Troubleshooting of electrical system (E-mode) SEN03563-00 Troubleshooting of hydraulic and mechanical system (H-mode) SEN03564-01

00 Index and foreword SEN03539-03 PC300, 350-7E0 3 Troubleshooting of engine (S-mode) SEN03565-01 50 Disassembly and assembly SEN03566-03 General information on disassembly and assembly SEN03567-03 q Engine and cooling system SEN03568-01 Power train SEN03569-01 Undercarriage and frame SEN03570-03 q Hydraulic system SEN03571-01 Work equipment SEN03572-00 Cab and its attachments SEN03573-01 Electrical system SEN03574-01 90 Diagrams and drawings SEN03575-01 Hydraulic diagrams and drawings SEN03577-00 Electrical diagrams and drawings SEN03576-01

SEN03539-03 00 Index and foreword 4 PC300, 350-7E0 Table of contents 1 00 Index and foreword Index SEN03539-03 Composition of shop manual ................................................................................................... 2 Table of contents...................................................................................................................... 4 Foreword and general information SEN03540-01 Safety notice ............................................................................................................................ 2 How to read the shop manual .................................................................................................. 7 Explanation of terms for maintenance standard ...................................................................... 9 Handling of electric equipment and hydraulic component ....................................................... 11 Handling of connectors newly used for engines ...................................................................... 20 How to read electric wire code................................................................................................. 23 Precautions when carrying out operation ................................................................................ 26 Method of disassembling and connecting push-pull type coupler ........................................... 29 Standard tightening torque table .............................................................................................. 32 Conversion table ...................................................................................................................... 36 01 Specification Specification and technical data SEN03542-00 Specification dimension drawings ............................................................................................ 2 Specifications ........................................................................................................................... 4 Weight table ............................................................................................................................. 10 Table of fuel, coolant and lubricants ........................................................................................ 12 10 Structure, function and maintenance standard Engine and cooling system SEN03544-00 Engine related parts................................................................................................................. 2 Radiator, oil cooler and aftercooler .......................................................................................... 3 Power train SEN03545-00 Power train............................................................................................................................... 2 Final drive ................................................................................................................................ 4 Sprocket ................................................................................................................................... 6 Swing machinery ..................................................................................................................... 8 Swing circle.............................................................................................................................. 10 Undercarriage and frame SEN03546-00 Track frame and recoil spring .................................................................................................. 2 Idler .......................................................................................................................................... 4 Carrier roller ............................................................................................................................. 6 Track roller ............................................................................................................................... 7 Track shoe ............................................................................................................................... 8 Hydraulic system, Part 1 SEN03547-00 Hydraulic equipment layout drawing ........................................................................................ 2 Hydraulic tank and filter ........................................................................................................... 4 Hydraulic pump ........................................................................................................................ 6 Hydraulic system, Part 2 SEN03548-01 Control valve ............................................................................................................................ 2 CLSS ....................................................................................................................................... 14 Functions and operation by valve ............................................................................................ 18 Merge-divider valve ................................................................................................................. 33 Attachment circuit selector valve ............................................................................................. 58 Hydraulic drift prevention valve................................................................................................ 60 Hydraulic system, Part 3 SEN03549-00 Valve control ............................................................................................................................ 2 PPC valve ................................................................................................................................ 3 Solenoid valve ......................................................................................................................... 19

00 Index and foreword SEN03539-03 PC300, 350-7E0 5 PPC accumulator..................................................................................................................... 21 Return oil filter ......................................................................................................................... 22 Center swivel joint ................................................................................................................... 23 Travel motor............................................................................................................................. 24 Swing motor............................................................................................................................. 36 Hydraulic cylinder .................................................................................................................... 45 Work equipment SEN03550-00 Work equipment ...................................................................................................................... 2 Dimensions of components ..................................................................................................... 4 Cab and its attachments SEN03551-00 Air conditioner piping ............................................................................................................... 2 Electrical system SEN03552-02 Engine control.......................................................................................................................... 2 Electronic control system......................................................................................................... 11 Monitor system ........................................................................................................................ 36 Sensor ..................................................................................................................................... 54 KOMTRAX system .................................................................................................................. 57 20 Standard value table Standard service value table SEN03554-01 Standard value table for engine related parts .......................................................................... 2 Standard value table for chassis related parts ......................................................................... 3 30 Testing and adjusting Testing and adjusting, Part 1 SEN03556-02 Tools for testing, adjusting and troubleshooting ...................................................................... 3 Sketches of special tools ......................................................................................................... 7 Measuring engine speed ......................................................................................................... 8 Measuring air boost pressure .................................................................................................. 9 Measuring exhaust gas color................................................................................................... 10 Adjusting valve clearance ........................................................................................................ 12 Measuring compression pressure ........................................................................................... 14 Measuring blow-by pressure ................................................................................................... 18 Measuring engine oil pressure ................................................................................................ 19 Measuring fuel pressure .......................................................................................................... 20 Handling during cylinder cut-out operation .............................................................................. 25 Handling during no injection cranking operation...................................................................... 25 Measuring fuel return rate and leakage ................................................................................... 26 Bleeding air from fuel circuit .................................................................................................... 28 Checking fuel circuit for leakage.............................................................................................. 29 Testing and adjusting air compressor belt tension................................................................... 30 Replacement of fan belt ........................................................................................................... 31 Replacement of alternator belt ................................................................................................ 32 Measuring clearance in swing circle bearings ......................................................................... 33 Testing and adjusting track shoe tension................................................................................. 34 Testing and adjusting oil pressure in work equipment, swing and travel circuit ....................... 35 Testing and adjusting control circuit oil pressure ..................................................................... 39 Testing and adjusting pump PC control circuit oil pressure ..................................................... 40 Testing and adjusting pump LS control circuit oil pressure...................................................... 43 Measuring solenoid valve output pressure .............................................................................. 48 Measuring PPC valve output pressure .................................................................................... 52 Adjusting play of work equipment and swing PPC valves ....................................................... 53 Inspecting locations of hydraulic drift of work equipment ........................................................ 54 Releasing remaining pressure in hydraulic circuit ................................................................... 56 Measuring oil leakage amount................................................................................................. 57 Bleeding air from various parts ................................................................................................ 59

SEN03539-03 00 Index and foreword 6 PC300, 350-7E0 Testing and adjusting, Part 2 SEN03557-01 Special functions of machine monitor ...................................................................................... 2 Testing and adjusting, Part 3 SEN04147-01 Procedure for turning on KOMTRAX terminal ......................................................................... 2 Indication by KOMTRAX terminal lamps ................................................................................. 5 Handling voltage circuit of engine controller ............................................................................ 8 Preparation work for troubleshooting of electrical system ....................................................... 9 Procedure for testing diodes .................................................................................................... 13 Pm clinic service ...................................................................................................................... 14 40 Troubleshooting Failure code table and fuse locations SEN04148-02 Failure codes table .................................................................................................................. 2 Before carrying out troubleshooting when failure code is displayed ........................................ 6 General information on troubleshooting SEN03559-03 Points to remember when troubleshooting .............................................................................. 2 Sequence of events in troubleshooting.................................................................................... 3 Checks before troubleshooting ................................................................................................ 4 Classification and troubleshooting steps ................................................................................. 5 Information in troubleshooting table......................................................................................... 6 Connection table for connector pin numbers ........................................................................... 11 T- branch box and T- branch adapter table.............................................................................. 47 Troubleshooting by failure code (Display of code), Part 1 SEN03560-02 Failure code [AA10NX] Air cleaner Clogging ........................................................................... 4 Failure code [AB00KE] Charge Voltage Low ........................................................................... 6 Failure code [B@BAZG] Eng Oil Press. Low........................................................................... 8 Failure code [B@BAZK] Eng Oil Level Low............................................................................. 10 Failure code [B@BCNS] Eng. Water Overheat ....................................................................... 12 Failure code [B@BCZK] Eng Water Level Low ....................................................................... 14 Failure code [B@HANS] Hydr Oil Overheat ............................................................................ 16 Failure code [CA111] EMC Critical Internal Failure.................................................................. 18 Failure code [CA115] Eng Ne and Bkup Speed Sens Error ..................................................... 19 Failure code [CA122] Chg Air Press Sensor High Error .......................................................... 20 Failure code [CA123] Chg Air Press Sensor Low Error ........................................................... 22 Failure code [CA131] Throttle Sensor High Error .................................................................... 24 Failure code [CA132] Throttle Sensor Low Error ..................................................................... 26 Failure code [CA144] Coolant Temp Sens High Error ............................................................. 28 Failure code [CA145] Coolant Temp Sens Low Error .............................................................. 30 Failure code [CA153] Chg Air Temp Sensor High Error .......................................................... 32 Failure code [CA154] Chg Air Temp Sensor Low Error ........................................................... 34 Failure code [CA155] Chg Air Temp High Speed Derate ......................................................... 36 Failure code [CA187] Sens Supply 2 Volt Low Error ............................................................... 38 Failure code [CA221] Ambient Press Sens High Error ............................................................ 40 Failure code [CA222] Ambient Press Sens Low Error ............................................................. 42 Failure code [CA227] Sens Supply 2 Volt High Error .............................................................. 44 Failure code [CA234] Eng Overspeed ..................................................................................... 45 Failure code [CA238] Ne Speed Sens Supply Volt Error ......................................................... 46 Failure code [CA271] IMV/PCV1 Short Error........................................................................... 47 Failure code [CA272] IMV/PCV1 Open Error .......................................................................... 48 Failure code [CA322] Inj #1 (L/B#1) Open/Short Error ............................................................ 50 Failure code [CA323] Inj #5 (L/B#5) Open/Short Error ............................................................ 52 Failure code [CA324] Inj #3 (L/B#3) Open/Short Error ............................................................ 54 Failure code [CA325] Inj #6 (L/B#6) Open/Short Error ............................................................ 56 Failure code [CA331] Inj #2 (L/B#2) Open/Short Error ............................................................ 58 Failure code [CA332] Inj #4 (L/B#4) Open/Short Error ............................................................ 60

00 Index and foreword SEN03539-03 PC300, 350-7E0 7 Troubleshooting by failure code (Display of code), Part 2 SEN03561-01 Failure code [CA342] Calibration Code Incompatibility ........................................................... 3 Failure code [CA351] Injectors Drive Circuit Error ................................................................... 4 Failure code [CA352] Sens Supply 1 Volt Low Error ............................................................... 6 Failure code [CA386] Sens Supply 1 Volt High Error .............................................................. 8 Failure code [CA428] Water in Fuel Sensor High Error ........................................................... 10 Failure code [CA429] Water in Fuel Sensor Low Error............................................................ 12 Failure code [CA435] Eng. Oil Press Sw Error ........................................................................ 14 Failure code [CA441] Battery Voltage Low Error ..................................................................... 16 Failure code [CA442] Battery Voltage High Error .................................................................... 18 Failure code [CA449] Rail Press Very High Error .................................................................... 20 Failure code [CA451] Rail Press Sensor High Error................................................................ 24 Failure code [CA452] Rail Press Sensor Low Error ................................................................ 26 Failure code [CA553] Rail Press High Error ............................................................................ 28 Failure code [CA559] Rail Press Low Error ............................................................................. 29 Failure code [CA689] Eng Ne Speed Sensor Error ................................................................. 31 Failure code [CA731] Eng Bkup Speed Sens Phase Error...................................................... 33 Failure code [CA757] All Persistent Data Lost Error ............................................................... 34 Failure code [CA778] Eng Bkup Speed Sensor Error.............................................................. 36 Failure code [CA1633] KOMNET Datalink Timeout Error ........................................................ 38 Failure code [CA2185] Throt Sens Sup Volt High Error .......................................................... 40 Failure code [CA2186] Throt Sens Sup Volt Low Error ........................................................... 41 Failure code [CA2249] Rail Press Very Low Error ................................................................... 42 Failure code [CA2265] Fuel Feed Pump Open Error .............................................................. 44 Failure code [CA2266] Fuel Feed Pump Short Error............................................................... 46 Failure code [CA2311] IMV Solenoid Error .............................................................................. 48 Failure code [CA2555] Grid Htr Relay Volt Low Error ............................................................. 50 Failure code [CA2556] Grid Htr Relay Volt High Error ............................................................. 52 Failure code [D110KB] Battery Relay Drive Short Circuit ........................................................ 54 Failure code [D196KA] Service Return Relay Disc. ................................................................ 56 Failure code [D196KB] Service Return Relay S/C .................................................................. 58 Failure code [DA25KP] Press. Sensor Power Abnormality ..................................................... 60 Failure code [DA2RMC] Pump Comm. Abnormality................................................................ 62 Failure code [DA2SKQ] Model Selection Abnormality............................................................. 64 Troubleshooting by failure code (Display of code), Part 3 SEN03562-01 Failure code [DAFRMC] Monitor Comm. Abnormality ............................................................. 4 Failure code [DHPAMA] F Pump Press Sensor Abnormality................................................... 6 Failure code [DGH2KB] Hydr Oil Sensor Short Circuit ............................................................ 8 Failure code [DHPBMA] R Pump Press Sensor Abnormality .................................................. 10 Failure code [DHS3MA] Arm Curl PPC Press Sensor Abnormality......................................... 12 Failure code [DHS4MA] Bucket Curl PPC Press Sensor Abnormality .................................... 14 Failure code [DW43KA] Travel Speed Sol. Open Circuit ......................................................... 16 Failure code [DW43KB] Travel Speed Sol. Short Circuit ......................................................... 18 Failure code [DW45KA] Swing Brake Sol. Open Circuit .......................................................... 20 Failure code [DW45KB] Swing Brake Sol. Short Circuit .......................................................... 24 Failure code [DW91KA] Travel Junction Sol. Open Circuit...................................................... 26 Failure code [DW91KB] Travel Junction Sol. Short Circuit ...................................................... 28 Failure code [DWJ0KA] Merge-divider Sol. Open Circuit ........................................................ 30 Failure code [DWJ0KB] Merge-divider Sol. Short Circuit ........................................................ 32 Failure code [DWK0KA] 2-stage Relief Sol. Open Circuit ....................................................... 34 Failure code [DWK0KB] 2-stage Relief Sol. Short Circuit ....................................................... 36 Failure code [DXA0KA] PC-EPC Sol. Open Circuit ................................................................. 38 Failure code [DXA0KB] PC-EPC Sol. Short Circuit ................................................................. 40 Failure code [DXE0KA] LS-EPC Sol. Open Circuit ................................................................. 42 Failure code [DXE0KB] LS-EPC Sol. Short Circuit .................................................................. 44 Failure code [DXE4KA] Service Current EPC Open Circuit .................................................... 46 Failure code [DXE4KB] Service Current EPC Short Circuit .................................................... 47 Failure code [DY20KA] Wiper Working Abnormality................................................................ 48

SEN03539-03 00 Index and foreword 8 PC300, 350-7E0 Failure code [DY20MA] Wiper Parking Abnormality ................................................................ 50 Failure code [DY2CKB] Washer Drive Short Circuit ................................................................ 52 Failure code [DY2DKB] Wiper Drive (Fwd) Short Circuit ......................................................... 54 Failure code [DY2EKB] Wiper Drive (Rev) Short Circuit ......................................................... 56 Troubleshooting of electrical system (E-mode) SEN03563-00 Before carrying out troubleshooting of electrical system ......................................................... 4 Information contained in troubleshooting table ........................................................................ 6 E-1 Engine does not start ........................................................................................................ 7 E-2 Auto-decelerator does not operate.................................................................................... 10 E-3 Automatic warming-up system does not operate .............................................................. 12 E-4 Preheater does not operate .............................................................................................. 14 E-5 All work equipment, swing, and travel mechanism do not move....................................... 16 E-6 Power maximizing function does not operate ................................................................... 18 E-7 Machine monitor does not display at all ............................................................................ 20 E-8 Machine monitor does not display some items ................................................................. 22 E-9 Contents of display by machine monitor are different from applicable machine ............... 22 E-10 Fuel level monitor was lighted in red while engine running ............................................. 23 E-11 Engine coolant temperature gauge does not indicate normally ...................................... 24 E-12 Hydraulic oil temperature gauge does not indicate normally .......................................... 26 E-13 Fuel level gauge does not indicate normally ................................................................... 27 E-14 Swing lock monitor does not indicate normally ............................................................... 28 E-15 When monitor switch is operated, monitor displays nothing ........................................... 30 E-16 Windshield wiper and window washer do not operate .................................................... 32 E-17 Machine push-up function does not operate normally .................................................... 36 E-18 Monitoring function fails to display “boom raise” normally .............................................. 38 E-19 Monitoring function fails to display “boom lower” normally.............................................. 40 E-20 Monitoring function fails to display “arm IN” normally ..................................................... 42 E-21 Monitoring function fails to display “arm OUT” normally ................................................. 44 E-22 Monitoring function fails to display “bucket CURL” normally ........................................... 46 E-23 Monitoring function fails to display “bucket DUMP” normally .......................................... 48 E-24 Monitoring function fails to display “swing” normally ....................................................... 50 E-25 Monitoring function fails to display “travel” normally ....................................................... 52 E-26 Monitoring function fails to display “travel differential pressure” normally ....................... 54 E-27 Monitoring function fails to display “service” normally ..................................................... 56 E-28 KOMTRAX system does not operate normally ............................................................... 58 E-29 Air conditioner does not operate ..................................................................................... 60 E-30 Travel alarm does not sound or does not stop sounding ................................................ 62 E-31 Horn does not sound ....................................................................................................... 64 Troubleshooting of hydraulic and mechanical system (H-mode) SEN03564-01 System chart for hydraulic and mechanical system................................................................. 4 Information contained in troubleshooting table ........................................................................ 6 H-1 All work equipment lack power, or travel and swing speeds are slow .............................. 8 H-2 Engine speed sharply drops or engine stalls .................................................................... 10 H-3 No work equipment, swing or travel move ........................................................................ 11 H-4 Abnormal noise is heard from around hydraulic pump ..................................................... 11 H-5 Auto-decelerator does not work ........................................................................................ 12 H-6 Fine control mode does not function or responds slow..................................................... 12 H-7 Boom moves slowly or lacks power .................................................................................. 13 H-8 Arm moves slowly or lacks power ..................................................................................... 14 H-9 Bucket moves slowly or lacks power ................................................................................ 15 H-10 Work equipment does not move in its single operation................................................... 15 H-11 Work equipment has a bit too fast hydraulic drift ............................................................ 16 H-12 Work equipment has big time lag.................................................................................... 18 H-13 Other work equipment moves when relieving single circuit ............................................ 18 H-14 Power max. switch does not operate .............................................................................. 19 H-15 Machine push-up function does not operate ................................................................... 19 H-16 In compound operation, work equipment with larger load moves slowly ........................ 20 H-17 In swing + boom RAISE operation, boom moves slowly................................................. 20

00 Index and foreword SEN03539-03 PC300, 350-7E0 9 H-18 In swing + travel operation, travel speed drops sharply.................................................. 20 H-19 Machine swerves in travel .............................................................................................. 21 H-20 Machine travels slowly .................................................................................................... 22 H-21 Machine cannot be easily steered or lacks power .......................................................... 23 H-22 Travel speed does not shift, or it is too slow or fast ........................................................ 24 H-23 Track shoe does not turn (on one side only)................................................................... 25 H-24 Machine does not swing ................................................................................................. 26 H-25 Swing acceleration is poor, or swing speed is slow ........................................................ 28 H-26 Excessive overrun when stopping swing ........................................................................ 30 H-27 There is big shock when stopping swing ........................................................................ 31 H-28 Large sound is made when upper structure stops swinging. .......................................... 31 H-29 Swing hydraulic drift is too big ........................................................................................ 32 Troubleshooting of engine (S-mode) SEN03565-01 Method of using troubleshooting chart .................................................................................... 3 S-1 Starting performance is poor ............................................................................................. 6 S-2 Engine does not start ........................................................................................................ 7 S-3 Engine does not pick up smoothly .................................................................................... 10 S-4 Engine stops during operations ........................................................................................ 11 S-5 Engine does not rotate smoothly ...................................................................................... 12 S-6 Engine lacks output (or lacks power) ................................................................................ 13 S-7 Exhaust smoke is black (incomplete combustion) ............................................................ 14 S-8 Oil consumption is excessive (or exhaust smoke is blue) ................................................. 15 S-9 Oil becomes contaminated quickly ................................................................................... 16 S-10 Fuel consumption is excessive ....................................................................................... 17 S-11 Oil is in coolant (or coolant spurts back or coolant level goes down) .............................. 18 S-12 Oil pressure drops ........................................................................................................... 19 S-13 Oil level rises (Entry of coolant or fuel) ........................................................................... 20 S-14 Coolant temperature becomes too high (overheating).................................................... 21 S-15 Abnormal noise is made ................................................................................................. 22 S-16 Vibration is excessive ..................................................................................................... 23 50 Disassembly and assembly General information on disassembly and assembly SEN03567-03 How to read this manual .......................................................................................................... 2 Coating materials list ............................................................................................................... 4 Special tools list ....................................................................................................................... 7 Sketches of special tools ......................................................................................................... 11 Engine and cooling system SEN03568-01 Removal and installation of fuel supply pump assembly ......................................................... 2 Removal and installation of engine front seal .......................................................................... 5 Removal and installation of engine rear seal ........................................................................... 8 Removal and installation of cylinder head assembly ............................................................... 13 Removal and installation of radiator assembly ........................................................................ 26 Removal and installation of hydraulic oil cooler assembly ...................................................... 28 Removal and installation of aftercooler assembly ................................................................... 30 Removal and installation of engine and hydraulic pump assembly ......................................... 31 Power train SEN03569-01 Removal and installation of final drive assembly ..................................................................... 2 Disassembly and assembly of final drive assembly ................................................................ 3 Removal and installation of swing motor and swing machinery assembly .............................. 11 Disassembly and assembly of swing motor and swing machinery assembly.......................... 12 Removal and installation of swing circle assembly .................................................................. 19 Undercarriage and frame SEN03570-03 Disassembly and assembly of carrier roller ............................................................................. 2 Disassembly and assembly of track roller assembly ............................................................... 3 Disassembly and assembly of idler assembly ......................................................................... 4 Disassembly and assembly of recoil spring............................................................................. 7

Komatsu PC300-7, PC300LC-7, PC350-7, PC350LC-7 Hydraulic Excavator Service Repair Workshop Manual (SN:40001 and up, 200

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