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Komatsu PC270-8, PC270LC-8 Hydraulic Excavator Shop Manual SEN00420-13 – PDF DOWNLOAD
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Komatsu PC270-8, PC270LC-8 Hydraulic Excavator Shop Manual
SERIAL NUMBERS:
PC270 – 20001 and up
PC270LC-20001 and up
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Description
Komatsu PC270-8, PC270LC-8 Hydraulic Excavator Shop Manual
FILE DETAILS:
Komatsu PC270-8, PC270LC-8 Hydraulic Excavator Shop Manual
Brands: Komatsu
Equipment Type: Hydraulic Excavator
Manuals Type: Shop Manual
Machine Model: PC270-8, PC270LC-8
Serial Number: 20001 and up
Book Code: SEN00420-13
Language: English
Pages: 1070
File Format: Portable Document Format (PDF)
DESCRIPTION:
Komatsu PC270-8, PC270LC-8 Hydraulic Excavator Shop Manual
HOW TO READ THE SHOP MANUAL:
1. Composition of shop manual
This shop manual contains the necessary technical information for services performed in a workshop. For ease of understanding, the manual is divided into the following sections.
00. FOREWORD:
This section explains the safety and basic information.
01. GENERAL:
This section explains the specifications of the machine.
10. STRUCTURE AND FUNCTION, MAINTENANCE STANDARD:
This section explains the structure, function, and maintenance standard values of each component. The structure and function sub-section explains the structure and function of each component. It serves not only to give an understanding of the structure, but also serves as reference material for troubleshooting. The maintenance standard sub-section explains the criteria and remedies for disassembly and service.
20. TESTING AND ADJUSTING:
Standard value table
This section explains the standard values for new machine and judgement criteria for testing, adjusting, and troubleshooting. This standard value table is used to check the standard values in testing and adjusting and to judge parts in troubleshooting.
Testing and adjusting
This section explains measuring instruments and measuring methods for testing and adjusting, and method of adjusting each part. The standard values and judgement criteria for testing and adjusting
are explained in Testing and adjusting.
Troubleshooting
This section explains how to find out failed parts and how to repair them. The troubleshooting is divided by failure modes. The “S mode” of the troubleshooting related to the engine may be also explained in
the Chassis volume and Engine volume. In this case, see the Chassis volume.
30. DISASSEMBLY AND ASSEMBLY:
This section explains the special tools and procedures for removing, installing, disassembling, and assembling each component, as well as precautions for them. In addition, tightening torque and quantity and weight of coating material, oil, grease, and coolant necessary for the work are also explained.
90. OTHERS (chassis volume)/Repair and replacement of parts (engine volume):
• Chassis volume
This section gives hydraulic circuit diagrams and electrical circuit diagrams.
• Engine volume
This section explains the method of reproducing, repairing, and replacing parts.
TABLE OF CONTENTS:
Komatsu PC270-8, PC270LC-8 Hydraulic Excavator Shop Manual
COVER ....................................................................................................... 1 00 Index and foreword........................................................................................ 0 Index.................................................................................................... 3 Composition of shop manual........................................................................... 4 Table of contents.................................................................................... 6 Foreword and general information......................................................................... 15 Safety notice........................................................................................ 16 How to read the shop manual.......................................................................... 21 Explanation of terms for maintenance standard........................................................ 23 Handling of electric equipment and hydraulic component............................................... 25 Handling of connectors newly used for engines........................................................ 34 How to read electric wire code....................................................................... 37 Precautions when carrying out operation.............................................................. 40 Method of disassembling and connecting push-pull type coupler........................................ 43 Standard tightening torque table..................................................................... 46 Conversion table..................................................................................... 50 01 Specification............................................................................................. 0 Specification and technical data......................................................................... 57 Specification dimension drawings..................................................................... 58 Working range diagram................................................................................ 59 Specifications....................................................................................... 60 Weight table......................................................................................... 62 Table of fuel, coolant and lubricants................................................................ 64 10 Structure, function and maintenance standard.............................................................. 0 Engine and cooling system................................................................................ 67 Engine and cooling system............................................................................ 68 Engine related parts............................................................................. 68 Radiator, oil cooler, aftercooler and fuel cooler................................................ 69 Power train.............................................................................................. 71 Power train.......................................................................................... 72 Final drive.......................................................................................... 74 Swing machinery...................................................................................... 76 Swing circle......................................................................................... 78 Undercarriage and frame.................................................................................. 81 Undercarriage and frame.............................................................................. 82 Track frame and recoil spring.................................................................... 82 Idler............................................................................................ 84 Carrier roller................................................................................... 86 Track roller..................................................................................... 87 Track shoe....................................................................................... 88 Hydraulic system, Part 1................................................................................. 93 Hydraulic system, Part 1............................................................................. 94 Hydraulic equipment layout drawing............................................................... 94 Hydraulic tank and filter........................................................................ 96 Hydraulic pump................................................................................... 98 Pilot oil filter................................................................................. 120 Hydraulic system, Part 2................................................................................. 123 Hydraulic system, Part 2............................................................................. 124 Control valve.................................................................................... 124 CLSS............................................................................................. 135 Functions and operation by valve................................................................. 140 Hydraulic system, Part 3................................................................................. 179 Swing motor.......................................................................................... 180 Center swivel joint.................................................................................. 190 Travel motor......................................................................................... 193 PPC valve............................................................................................ 206 Valve control........................................................................................ 228 Solenoid valve....................................................................................... 230 PPC accumulator...................................................................................... 232 Return oil filter.................................................................................... 233 Attachment circuit selector valve.................................................................... 234 Hydraulic cylinder................................................................................... 236 Work equipment........................................................................................... 239 Work equipment....................................................................................... 240 Dimensions of components......................................................................... 240 Cab and its attachments.................................................................................. 247 Air conditioner piping............................................................................... 248 Electrical system........................................................................................ 251 Engine control....................................................................................... 252 Electrical control system............................................................................ 260 Monitor system....................................................................................... 283 Sensor............................................................................................... 310 KOMTRAX system....................................................................................... 313 20 Standard value table...................................................................................... 0 Standard service value table............................................................................. 317 Standard service value table......................................................................... 318 Standard value table for engine related parts.................................................... 318 Standard value table for chassis related parts................................................... 319 30 Testing and adjusting..................................................................................... 0 Testing and adjusting, Part 1............................................................................ 331 Testing and adjusting, Part 1........................................................................ 333 Tools for testing, adjusting, and troubleshooting................................................ 333 Sketch of special tool........................................................................... 337 Testing engine speed............................................................................. 338 Testing intake air pressure (boost pressure)..................................................... 339 Checking exhaust gas color....................................................................... 340 Adjusting valve clearance........................................................................ 341 Testing compression pressure..................................................................... 343 Testing blow-by pressure......................................................................... 345 Testing engine oil pressure...................................................................... 346 Handling fuel system parts....................................................................... 347 Releasing residual pressure from fuel system..................................................... 347 Testing fuel pressure............................................................................ 348 Testing fuel delivery, return and leak amount.................................................... 351 Bleeding air from fuel circuit................................................................... 354 Checking fuel circuit for leakage................................................................ 355 Checking and adjusting air conditioner compressor belt tension................................... 356 Replacing fan belt............................................................................... 357 Testing swing circle bearing clearance........................................................... 358 Checking and adjusting track shoe tension........................................................ 359 Testing and adjusting oil pressure in work equipment, swing, and travel circuits................. 361 Testing control circuit basic pressure........................................................... 364 Testing and adjusting oil pressure in pump PC control circuit.................................... 365 Testing and adjusting oil pressure in pump LS control circuit.................................... 368 Testing solenoid valve output pressure........................................................... 373 Testing PPC valve output pressure................................................................ 376 Adjusting play of work equipment and swing PPC valves............................................ 378 Checking parts which cause hydraulic drift of work equipment..................................... 379 Releasing residual pressure from hydraulic circuit............................................... 381 Testing oil leakage.............................................................................. 382 Bleeding air from each part...................................................................... 385 Checking cab tipping stopper..................................................................... 387 Installation and adjustment of mirrors........................................................... 388 Testing and adjusting, Part 2............................................................................ 393 Special functions of machine monitor................................................................. 394 Testing and adjusting, Part 3............................................................................ 451 Testing and adjusting, Part 3........................................................................ 452 Handling voltage circuit of engine controller.................................................... 452 Preparation work for troubleshooting of electrical system........................................ 453 Procedure for testing diodes..................................................................... 458 Pm Clinic service................................................................................ 459 40 Troubleshooting........................................................................................... 0 Failure code table and fuse locations.................................................................... 467 Failure codes table.................................................................................. 468 Fuse locations....................................................................................... 473 General Information on troubleshooting................................................................... 479 General information on troubleshooting............................................................... 480 Points to remember when troubleshooting.......................................................... 480 Sequence of events in troubleshooting............................................................ 481 Check before troubleshooting..................................................................... 482 Classification and procedures for troubleshooting................................................ 483 How to read electric wire code................................................................... 487 Information in troubleshooting table............................................................. 490 Connection table for connector pin numbers....................................................... 492 T- branch box and T- branch adapter table........................................................ 528 Troubleshooting by failure code (Display of code), Part 1................................................ 533 Failure code [989L00] Engine Controller Lock Caution 1............................................... 536 Failure code [989M00] Engine Controller Lock Caution 2............................................... 536 Failure code [989N00] Engine Controller Lock Caution 3............................................... 537 Failure code [AA10NX] Air Cleaner Clogging........................................................... 537 Failure code [AB00KE] Charge Voltage Low............................................................. 538 Failure code [B@BAZG] Eng Oil Press. Low............................................................. 540 Failure code [B@BAZK] Eng Oil Level Low.............................................................. 540 Failure code [B@BCNS] Eng Water Overheat............................................................. 541 Failure code [B@BCZK] Eng Water Level Low............................................................ 541 Failure code [B@HANS] Hydr Oil Overheat.............................................................. 542 Failure code [CA111] EMC Critical Internal Failure................................................... 542 Failure code [CA115] Eng Ne and Bkup Speed Sens Error................................................ 543 Failure code [CA122] Chg Air Press Sensor High Error................................................. 544 Failure code [CA123] Chg Air Press Sensor Low Error.................................................. 546 Failure code [CA131] Throttle Sensor High Error...................................................... 548 Failure code [CA132] Throttle Sensor Low Error....................................................... 550 Failure code [CA144] Coolant Temp Sens High Error.................................................... 552 Failure code [CA145] Coolant Temp Sens Low Error..................................................... 554 Failure code [CA153] Chg Air Temp Sensor High Error.................................................. 556 Failure code [CA154] Chg Air Temp Sensor Low Error................................................... 558 Failure code [CA155] Chg Air Temp High Speed Derate.................................................. 560 Failure code [CA187] Sens Supply 2 Volt Low Error.................................................... 562 Failure code [CA221] Ambient Press Sens High Error................................................... 564 Failure code [CA222] Ambient Press Sens Low Error.................................................... 566 Failure code [CA227] Sens Supply 2 Volt High Error................................................... 568 Failure code [CA234] Eng Overspeed................................................................... 569 Failure code [CA238] Ne Speed Sens Supply Volt Error................................................. 570 Failure code [CA271] IMV/PCV1 Short Error............................................................ 571 Failure code [CA272] IMV/PCV1 Open Error............................................................. 572 Failure code [CA322] Inj #1 Open/Short Error......................................................... 574 Failure code [CA323] Inj #5 Open/Short Error......................................................... 576 Failure code [CA324] Inj #3 Open/Short Error......................................................... 578 Failure code [CA325] Inj #6 Open/Short Error......................................................... 580 Failure code [CA331] Inj #2 Open/Short Error......................................................... 582 Failure code [CA332] Inj #4 Open/Short Error......................................................... 584 Troubleshooting by failure code (Display of code), Part 2................................................ 587 Troubleshooting by failure code (Display of code), Part 2............................................ 589 Failure code [CA342] Calibration Code Incompatibility............................................ 589 Failure code [CA351] Injectors Drive Circuit Error............................................... 590 Failure code [CA352] Sens Supply 1 Volt Low Error................................................ 592 Failure code [CA386] Sens Supply 1 Volt High Error............................................... 594 Failure code [CA428] Water in Fuel Sensor High Error............................................. 596 Failure code [CA429] Water in Fuel Sensor Low Error.............................................. 598 Failure code [CA435] Eng Oil Press Sw Error...................................................... 600 Failure code [CA441] Battery Voltage Low Error................................................... 601 Failure code [CA442] Battery Voltage High Error.................................................. 604 Failure code [CA449] Rail Press Very High Error.................................................. 606 Failure code [CA451] Rail Press Sensor High Error................................................ 608 Failure code [CA452] Rail Press Sensor Low Error................................................. 610 Failure code [CA488] Chg Air Temp High Torque Derate............................................. 612 Failure code [CA553] Rail Press High Error....................................................... 613 Failure code [CA559] Rail Press Low Error........................................................ 614 Failure code [CA689] Eng Ne Speed Sensor Error................................................... 616 Failure code [CA731] Eng Bkup Speed Sens Phase Error............................................. 618 Failure code [CA757] All Continuous Data Lost E.................................................. 620 Failure code [CA778] Eng Bkup Speed Sensor Error................................................. 622 Failure code [CA1633] KOMNET Datalink Timeout Error.............................................. 624 Failure code [CA2185] Throt Sens Sup Volt High Error............................................. 625 Failure code [CA2186] Throt Sens Sup Volt Low Error.............................................. 626 Failure code [CA2249] Rail Press Very Low Error.................................................. 627 Failure code [CA2311] IMV Solenoid Error......................................................... 628 Failure code [CA2555] Grid Htr Relay Volt High Error............................................. 630 Failure code [CA2556] Grid Htr Relay Volt Low Error.............................................. 632 Failure code [D19JKZ] Personal Code Relay Abnormality............................................ 634 Failure code [D862KA] GPS Antenna Discon......................................................... 636 Failure code [DA22KK] Pump Solenoid Power Low Error.............................................. 638 Failure code [DA25KP] 5V Sensor 1 Power Abnormality.............................................. 640 Failure code [DA29KQ] Model Selection Abnormality................................................ 646 Troubleshooting by failure code (Display of code), Part 3................................................ 649 Troubleshooting by failure code (Display of code), Part 3............................................ 651 Failure code [DA2RMC] CAN Discon (Pump Con Detected)............................................. 651 Failure code [DAF8KB] Short circuit in camera power supply....................................... 658 Failure code [DAFGMC] GPS Module Error........................................................... 660 Failure code [DAFRMC] CAN Discon (Monitor Detected).............................................. 661 Failure code [DGH2KB] Hydr Oil Sensor Short...................................................... 666 Failure code [DHPAMA] F Pump Press Sensor Abnormality............................................ 668 Failure code [DHPBMA] R Pump Press Sensor Abnormality............................................ 670 Failure code [DHS3MA] Arm Curl PPC Press Sensor Abnormality...................................... 672 Failure code [DHS4MA] Bucket Curl PPC Press Sensor Abnormality................................... 674 Failure code [DHS8MA] Boom Raise PPC Press Sensor Abnormality.................................... 676 Failure code [DHSAMA] Swing RH PPC Press Sensor Abnormality...................................... 678 Failure code [DHSBMA] Swing LH PPC Press Sensor Abnormality...................................... 680 Failure code [DHSDMA] Bucket Dump PPC Press Sensor Abnormality................................... 682 Failure code [DHX1MA] Overload Sensor Abnormality (Analog)....................................... 684 Failure code [DW43KA] Travel Speed Sol Discon.................................................... 688 Failure code [DW43KB] Travel Speed Sol Short..................................................... 690 Failure code [DW45KA] Swing Brake Sol Discon..................................................... 692 Failure code [DW45KB] Swing Brake Sol Short...................................................... 694 Failure code [DW91KA] Travel Junction Sol Discon................................................. 696 Failure code [DW91KB] Travel Junction Sol Short.................................................. 698 Failure code [DWA2KA] Service Sol Discon......................................................... 700 Failure code [DWA2KB] Service Sol Short.......................................................... 701 Failure code [DWK0KA] 2-stage Relief Sol Discon.................................................. 702 Failure code [DWK0KB] 2-stage Relief Sol Short................................................... 704 Troubleshooting by failure code (Display of code), Part 4................................................ 707 Troubleshooting by failure code (Display of code), Part 4............................................ 708 Failure code [DXA8KA] PC-EPC (F) Sol Discon...................................................... 708 Failure code [DXA8KB] PC-EPC (F) Sol Short....................................................... 710 Failure code [DXA9KA] PC-EPC (R) Sol Discon...................................................... 712 Failure code [DXA9KB] PC-EPC (R) Sol Short....................................................... 714 Failure code [DXE0KA] LS-EPC Sol Discon.......................................................... 716 Failure code [DXE0KB] LS-EPC Sol Short........................................................... 718 Failure code [DXE4KA] Service Current EPC Discon................................................. 720 Failure code [DXE4KB] Service Current EPC Short.................................................. 722 Failure code [DXE5KA] Merge-divider Main Sol Discon.............................................. 724 Failure code [DXE5KB] Merge-divider Main Sol Short............................................... 726 Failure code [DXE6KA] Merge-divider LS Sol Discon................................................ 728 Failure code [DXE6KB] Merge-divider LS Sol Short................................................. 730 Failure code [DY20KA] Wiper Working Abnormality.................................................. 732 Failure code [DY20MA] Wiper Parking Abnormality.................................................. 734 Failure code [DY2CKA] Washer Drive Discon........................................................ 736 Failure code [DY2CKB] Washer Drive Short......................................................... 738 Failure code [DY2DKB] Wiper Drive (For) Short.................................................... 740 Failure code [DY2EKB] Wiper Drive (Rev) Short.................................................... 742 Troubleshooting of electrical system (E-mode)............................................................ 745 Troubleshooting of electrical system (E-mode)........................................................ 747 Before carrying out troubleshooting of electrical system......................................... 747 Information in troubleshooting table............................................................. 749 E-1 When starting switch turned ON, machine monitor displays nothing............................. 750 E-2 When starting switch turned ON (before starting engine), basic check item lights up.......... 752 E-3 Engine does not start (Engine does not turn)................................................. 755 E-4 Preheater does not operate................................................................... 759 E-5 Automatic warm-up system does not operate (in cold season)................................... 763 E-6 All work equipment, swing, and travel mechanism do not move or cannot be locked.............. 764 E-7 Precaution lights up while engine is running................................................. 766 E-8 Emergency stop item lights up while engine is running........................................ 771 E-9 Engine coolant temperature gauge does not indicate normally.................................. 772 E-10 Hydraulic oil temperature gauge does not indicate correctly................................. 773 E-11 Fuel level gauge does not indicate correctly................................................ 776 E-12 Contents of display by machine monitor are different from applicable machine................ 778 E-13 Machine monitor does not display some items................................................. 778 E-14 Function switch does not work............................................................... 778 E-15 Auto-decelerator does not operate normally.................................................. 779 E-16 Working mode does not change................................................................ 780 E-17 Travel speed does not change................................................................ 781 E-18 Alarm buzzer cannot be stopped.............................................................. 782 E-19 Windshield wiper and window washer do not operate........................................... 783 E-20 Power maximizing function does not operate normally......................................... 785 E-21 Swing holding brake does not operate normally............................................... 787 E-22 Travel alarm does not sound or does not stop sounding....................................... 789 E-23 Air conditioner does not operate normally (including air conditioner abnormality record).... 791 E-24 While starting switch is in OFF position, service meter is not displayed.................... 803 E-25 Machine monitor cannot be set in service mode............................................... 803 E-26 Monitoring function does not display lever control signal normally.......................... 804 E-27 KOMTRAX system does not operate normally.................................................... 812 Troubleshooting of hydraulic and mechanical system (H-mode).............................................. 815 Troubleshooting of hydraulic and mechanical system (H-mode).......................................... 818 System diagram of hydraulic and mechanical system................................................ 818 Information in troubleshooting table............................................................. 820 H-1 Speed or power of whole work equipment, swing, and travel is low............................. 821 H-2 Engine speed lowers extremely or engine stalls............................................... 823 H-3 Work equipment, swing, and travel systems do not work........................................ 824 H-4 Abnormal sound comes out from around hydraulic pump.......................................... 824 H-5 Auto-decelerator does not operate............................................................ 825 H-6 Fine control performance or response is low.................................................. 825 H-7 Speed or power of boom is low................................................................ 826 H-8 Speed or power of arm is low................................................................. 827 H-9 Speed or power of bucket is low.............................................................. 828 H-10 Work equipment does not move singly......................................................... 828 H-11 Hydraulic drift of work equipment is large.................................................. 829 H-12 Time lag of work equipment is large......................................................... 831 H-13 When part of work equipment is relieved singly, other parts of work equipment move.......... 831 H-14 Power maximizing function does not work..................................................... 832 H-15 In compound operation of work equipment, speed of part loaded more is low................... 832 H-16 When machine swings and raises boom simultaneously, boom rising speed is low................ 833 H-17 When machine swings and travels simultaneously, travel speed is low......................... 833 H-18 Machine deviates during travel.............................................................. 834 H-19 Travel speed is low......................................................................... 835 H-20 Machine is not steered well or steering power is low........................................ 836 H-21 Travel speed does not change or travel speed is low/high.................................... 837 H-22 Travel system does not move (only one side)................................................. 838 H-23 Upper structure does not swing.............................................................. 839 H-24 Swing acceleration or swing speed is low.................................................... 841 H-25 Upper structure overruns remarkably when it stops swinging.................................. 842 H-26 Large shock is made when upper structure stops swinging..................................... 843 H-27 Large sound is made when upper structure stops swinging..................................... 843 H-28 Hydraulic drift of swing is large........................................................... 844 H-29 Attachment circuit is not changed........................................................... 845 H-30 Oil flow in attachment circuit cannot be controlled......................................... 845 Troubleshooting of engine (S-mode)....................................................................... 847 Troubleshooting of engine (S-mode)................................................................... 850 Method of using troubleshooting chart............................................................ 850 S-1 Starting performance is poor................................................................. 854 S-2 Engine does not start........................................................................ 855 S-3 Engine does not pick up smoothly............................................................. 858 S-4 Engine stops during operations............................................................... 859 S-5 Engine does not rotate smoothly.............................................................. 860 S-6 Engine lack output (or lacks power).......................................................... 861 S-7 Exhaust smoke is black (incomplete combustion)............................................... 862 S-8 Oil consumption is excessive (or exhaust smoke is blue)...................................... 863 S-9 Oil becomes contaminated quickly............................................................. 864 S-10 Fuel consumption is excessive............................................................... 865 S-11 Oil is in coolant (or coolant spurts back or coolant level goes down)....................... 866 S-12 Oil pressure drops.......................................................................... 867 S-13 Oil level rises (Entry of coolant/fuel)..................................................... 868 S-14 Coolant temperature becomes too high (overheating).......................................... 869 S-15 Abnormal noise is made...................................................................... 870 S-16 Vibration is excessive...................................................................... 871 50 Disassembly and assembly.................................................................................. 0 General information on disassembly and assembly.......................................................... 873 How to read this manual.............................................................................. 874 Coating materials list............................................................................... 876 Special tools list................................................................................... 879 Sketches of special tools............................................................................ 883 Engine and cooling system................................................................................ 889 Removal and installation of fuel supply pump assembly................................................ 890 Removal and installation of fuel injector assembly................................................... 894 Removal and installation of engine front seal........................................................ 903 Removal and installation of engine rear seal......................................................... 906 Removal and installation of cylinder head assembly................................................... 909 Removal and installation of radiator assembly........................................................ 923 Removal and installation of hydraulic oil cooler assembly............................................ 926 Removal and installation of aftercooler assembly..................................................... 928 Removal and installation of fuel cooler assembly..................................................... 930 Removal and installation of engine and hydraulic pump assembly....................................... 931 Power train.............................................................................................. 941 Removal and installation of final drive assembly..................................................... 942 Disassembly and assembly of final drive assembly..................................................... 943 Removal and installation of swing motor and swing machinery assembly................................. 952 Disassembly and assembly of swing motor and swing machinery assembly................................. 954 Removal and installation of swing circle assembly.................................................... 963 Undercarriage and frame.................................................................................. 965 Disassembly and assembly of carrier roller assembly.................................................. 966 Disassembly and assembly of track roller assembly.................................................... 967 Disassembly and assembly of idler assembly........................................................... 968 Disassembly and assembly of recoil spring assembly................................................... 971 Removal and installation of sprocket................................................................. 973 Expansion and installation of track shoe assembly.................................................... 974 Removal and installation of revolving frame assembly................................................. 976 Removal and installation of counterweight assembly................................................... 978 Hydraulic system......................................................................................... 981 Removal and installation of center swivel joint assembly............................................. 982 Disassembly and assembly of center swivel joint assembly............................................. 984 Removal and installation of hydraulic tank assembly.................................................. 985 Removal and installation of control valve assembly................................................... 989 Disassembly and assembly of control valve assembly................................................... 994 Removal and installation of hydraulic main pump assembly............................................. 998 Removal and installation of oil seal in hydraulic pump input shaft...................................1002 Disassembly and assembly of work equipment PPC valve assembly........................................1003 Disassembly and assembly of travel PPC valve assembly................................................1005 Disassembly and assembly of hydraulic cylinder assembly..............................................1008 Work equipment...........................................................................................1015 Work equipment.......................................................................................1016 Removal and installation of work equipment assembly..............................................1016 Cab and its attachments..................................................................................1020 Removal and installation of operator's cab assembly..................................................1021 Removal and installation of operator cab glass (stuck glass).........................................1024 Removal and installation of front window assembly....................................................1034 Removal and installation of floor frame assembly.....................................................1041 Electrical system........................................................................................1046 Removal and installation of air conditioner unit assembly............................................1047 Removal and installation of KOMTRAX communication modem assembly.....................................1050 Removal and installation of monitor assembly.........................................................1051 Removal and installation of pump controller assembly.................................................1053 90 Diagrams and drawings..................................................................................... 0 Hydraulic diagrams and drawings..........................................................................1056 Hydraulic circuit diagram PC270, 270LC-8 ............................................................1058 Electrical diagrams and drawings.........................................................................1061 Electrical circuit diagram...........................................................................1063 Connector arrangement diagram........................................................................1068
KOMATSU PC270-8, PC270LC-8 HYDRAULIC EXCAVATOR SHOP MANUAL SEN00420-13 – PDF DOWNLOAD:
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