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Komatsu PC128US-8, Shop Manual

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Komatsu PC128US-8 Shop Manual Download Page 10

00-8

PC128US-8

00 Index and foreword
Table of contents

Removal and installation of counterweight assembly (Machine with add-on weight)..................... 50-109

Hydraulic system................................................................................................................................ 50-111

Removal and installation of center swivel joint assembly............................................................... 50-111
Disassembly and assembly of center swivel joint assembly .......................................................... 50-113
Removal and installation of hydraulic tank assembly ..................................................................... 50-114
Removal and installation of hydraulic pump assembly................................................................... 50-117
Removal and installation of control valve assembly ....................................................................... 50-121
Disassembly and assembly of control valve assembly................................................................... 50-126
Disassembly and assembly of work equipment PPC valve assembly............................................ 50-136
Disassembly and assembly of travel PPC valve assembly ............................................................ 50-139
Disassembly and assembly of hydraulic cylinder assembly ........................................................... 50-141

Work equipment ................................................................................................................................. 50-147

Removal and installation of work equipment assembly.................................................................. 50-147

Cab and its attachments .................................................................................................................... 50-150

Removal and installation of operator cab assembly ....................................................................... 50-150
Removal and Installation of operator's cab door ............................................................................ 50-152
Removal and installation of operator's cab glass (stuck glass) ...................................................... 50-155
Removal and installation of front window assembly ....................................................................... 50-164
Removal and installation of floor frame assembly .......................................................................... 50-165

Electrical system ................................................................................................................................ 50-172

Removal and installation of air compressor assembly ................................................................... 50-172
Removal and installation of air conditioner condenser ................................................................... 50-173
Removal and installation of air conditioner unit assembly.............................................................. 50-174
Removal and installation of machine monitor assembly................................................................. 50-177
Removal and installation of pump controller assembly .................................................................. 50-178
Removal and installation of engine controller assembly................................................................. 50-179
Removal and installation of KOMTRAX communications module.................................................. 50-180

90 Diagrams and drawings

Hydraulic diagrams and drawings ......................................................................................................

90-3

Symbols used in hydraulic circuit diagrams....................................................................................

90-3

Hydraulic circuit diagram ................................................................................................................

90-5

Electrical diagrams and drawings ......................................................................................................

90-9

Symbols used in electric circuit diagrams.......................................................................................

90-9

Electrical circuit diagram ................................................................................................................

90-13

Connectors table and arrangement drawing ..................................................................................

90-25

Index .....................................................................................................................................................

1

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Find manuals at https://best-manuals.com

Summary of Contents for PC128US-8

Page 1: ...WEN00003 00 HYDRAULIC EXCAVATOR PC128US 8 SERIAL NUMBERS 20001 and up a Arm crane cannot be used on this machine...

Page 2: ...Find manuals at https best manuals com Find manuals at https best manuals com...

Page 3: ...US 8 00 1 HYDRAULIC EXCAVATOR 1SHOP MANUAL PC128US 8 Machine model Serial number PC128US 8 20001 and up 00 Index and foreword 1 Find manuals at https best manuals com Find manuals at https best manual...

Page 4: ...01 3 Specification dimension drawing 01 3 Working range diagram 01 4 Specifications 01 5 Weight table 01 8 Table of fuel coolant and lubricants 01 10 10 Structure function and maintenance standard En...

Page 5: ...5 Testing engine oil pressure 30 16 Handling fuel system parts 30 17 Releasing residual pressure from fuel system 30 17 Testing fuel pressure 30 18 Testing fuel return rate and fuel leakage 30 19 Blee...

Page 6: ...40 65 Failure code AB00KE Charge voltage low 40 66 Failure code B BAZG Eng oil press low 40 68 Failure code B BAZK Eng oil level low 40 68 Failure code B BCNS Eng coolant overheat 40 69 Failure code B...

Page 7: ...mality 40 140 Failure code DA26KP 5V sensor 2 power abnormality 40 143 Failure code DA2RMC CAN discon Pump controller detected 40 144 Failure code DAF8KB Short circuit in camera power supply 40 146 Fa...

Page 8: ...232 E 21 Travel alarm does not sound or does not stop sounding 40 234 E 22 Air conditioner does not operate normally including air conditioner abnormality record 40 235 E 23 While starting switch is...

Page 9: ...ating materials list 50 6 Special tool list 50 9 Sketch of special tool 50 13 Engine and cooling system 50 15 Removal and installation of fuel supply pump assembly 50 15 Removal and installation of fu...

Page 10: ...0 Removal and Installation of operator s cab door 50 152 Removal and installation of operator s cab glass stuck glass 50 155 Removal and installation of front window assembly 50 164 Removal and instal...

Page 11: ...peration always wear safety shoes and helmet Do not wear loose work clothes or clothes with buttons missing q Always wear safety glasses when hit ting parts with a hammer q Always wear safety glasses...

Page 12: ...e slings which have ample capacity and install them to proper places Operate the hoist or crane slowly to prevent the component from hitting any other part Do not work with any part still raised by th...

Page 13: ...ide hanging angle from the hook When hoisting a load with 2 or more ropes the force subjected to each rope will increase with the hanging angle The table below shows the variation of allow able load i...

Page 14: ...hile the slung load is swinging 6 Do not raise or lower a load while the crane is moving longitudinally or laterally 7 Do not drag a sling 8 When lifting up a load stop it just after it leaves the gro...

Page 15: ...ts in your eyes or contacts your skin you may lose your sight and your skin may be frozen Accordingly put on safety glasses safety gloves and safety clothes when recover ing or adding the refrigerant...

Page 16: ...h part The standard values and judgement criteria for testing and adjusting are explained in Testing and adjusting 40 Troubleshooting This section explains how to find out failed parts and how to repa...

Page 17: ...re indicated with International System of units SI For reference con ventionally used Gravitational System of units is indicated in parentheses Symbol Item Remarks k Safety Special safety precautions...

Page 18: ...ize set temporarily is called the standard size and the range of differ ence from the standard size is called the tolerance q The tolerance with the symbols of or is indicated on the right side of the...

Page 19: ...he interference is in the standard range 4 Repair limit and allowable value or allow able dimension q The size of a part changes because of wear and deformation while it is used The limit of changed s...

Page 20: ...wiring harnesses are more likely to be affected by the direct effects of rain water heat or vibration Furthermore during inspection and repair operations they are frequently removed and installed aga...

Page 21: ...at the same time if water does enter it is difficult for it to be drained Therefore if water should get into the connector the pins will be short circuited by the water so if any water gets in immedia...

Page 22: ...ec tors apart a Never pull with one hand 2 When removing from clips q Both of the connector and clip have stoppers which are engaged with each other when the connector is installed q When removing a c...

Page 23: ...make it too hot as this will cause short circuits a If there is any damage or break age replace the connector 2 Fix the connector securely Align the position of the connector correctly and then inser...

Page 24: ...nection Right of figure 1 Push in female connector 2 horizon tally until the lock clicks Arrow 1 2 Since locks a and b may not be set completely push in female connector 2 while moving it up and down...

Page 25: ...s the risk that oil in the air may cause defective contact so remove all oil and water from the com pressed air before blowing with air 2 Dry the inside of the connector with a dryer If water gets ins...

Page 26: ...lding on the body disconnect all wiring harness con nectors connected to the controller Fit an arc welding ground close to the welding point 5 Points to remember when troubleshooting electric circuits...

Page 27: ...o use unit exchange Disassembly and maintenance of hydraulic equipment should be carried out in a specially prepared dustproof workshop and the perfor mance should be checked with special test equipme...

Page 28: ...t will mix with the new oil and will shorten the life of the hydraulic oil 6 Flushing operations After disassembling and assembling the equip ment or changing the oil use flushing oil to remove the co...

Page 29: ...using NE 95 170 12V140 engines Ambient pressure sensor PAMB 125 170 12V140 engines Disconnect connector 1 according to the fol lowing procedure 1 Slide lock L1 to the right 2 While pressing lock L2 pu...

Page 30: ...ut connector 3 in the direction of the arrow q 114 engine q 107 engine a If the lock is on the underside use flat head screwdriver 1 since you cannot insert your fingers 2 While pressing up lock C of...

Page 31: ...onnector straight up 4 Turn housing type Round green connector q 140 engine Example Intake air pressure sensor in intake mani fold CANNON 04 PIM etc 1 Disconnect connector 6 according to the following...

Page 32: ...of 0 85 Indicates color of wire by color code Color codes are shown in Table 3 Indicates size of wire by nominal No Size Nominal No is shown in Table 2 Indicates type of wire by symbol Type symbol and...

Page 33: ...08 3 30 5 23 d approx 1 0 1 2 1 5 1 9 1 9 2 3 2 4 3 0 Cov er D AVS Standard 2 0 2 2 2 5 2 9 2 9 3 5 3 6 AV Standard 4 6 AEX Standard 2 0 2 2 2 7 3 0 3 1 3 8 4 6 Nominal No 8 15 20 30 40 50 60 85 100 C...

Page 34: ...Red LW Blue White BrW Brown White LY Blue Yellow BrY Brown Yellow O Orange Ch Charcoal P Pink Dg Dark green R Red G Green RB Red Black GB Green Black RG Red Green GL Green Blue RL Red Blue Gr Gray RW...

Page 35: ...ents be sure to use lifting equipment of ample strength q When using forcing screws to remove any components tighten the forcing screws uniformly in turn q Before removing any unit clean the surroundi...

Page 36: ...mes stopping the cylinder 100 mm from the end of its stroke 3 Next operate the hydraulic cylinder 3 4 times to the end of its stroke 4 After doing this run the engine at normal speed a When using the...

Page 37: ...ck and damage If any part is damaged replace it 2 Check the mounting bolts and nuts of the muffler exhaust pipe and their mounting parts for looseness If any bolt or nut is loosened retighten it 5 Che...

Page 38: ...joint 2 into mating adapter 3 Fig 1 a The adapter can be pushed in about 3 5 mm a Do not hold rubber cap portion 4 2 After hose joint 2 is pushed into adapter 3 press rubber cap portion 4 against adap...

Page 39: ...s contact surface a of the hexag onal portion at the male end Fig 6 2 While holding the condition of Step 1 turn lever 8 to the right clockwise Fig 7 3 While holding the condition of Steps 1 and 2 pul...

Page 40: ...l portion at the male end Fig 10 2 While holding the condition of Step 1 push cover 10 straight until it contacts contact surface b of the hexagonal por tion at the male end Fig 11 3 While holding the...

Page 41: ...This as a preview PDF file from best manuals com Download full PDF manual at best manuals com...

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