Caterpillar 312C Excavators Repair Service Manual
Complete service repair manual with Electrical Wiring Diagrams for Caterpillar 312C Excavators, with all the technical information to maintain, diagnose, repair, and rebuild like professional mechanics.
Caterpillar 312C Excavators workshop service repair manual includes:
* Numbered table of contents easy to use so that you can find the information you need fast.
* Detailed sub-steps expand on repair procedure information
* Numbered instructions guide you through every repair procedure step by step.
* Troubleshooting and electrical service procedures are combined with detailed wiring diagrams for ease of use.
* Notes, cautions and warnings throughout each chapter pinpoint critical information.
* Bold figure number help you quickly match illustrations with instructions.
* Detailed illustrations, drawings and photos guide you through every procedure.
* Enlarged inset helps you identify and examine parts in detail.
RENR5514 - Schematic (312C Excavator Hydraulic System).pdf
RENR5808 - Specifications (312C Excavator Machine System Specifications).pdf
RENR5814 - Schematic (312C Excavators Hydraulic System - Attachment Medium Pressure).pdf
RENR5815 - Schematic (312C Excavators Hydraulic System - Attachment One Pump with One Way Flow).pdf
RENR5816 - Schematic (312C Excavators Hydraulic System - Attachment Quick Couple).pdf
RENR5817 - Schematic (312C Excavators Hydraulic System - Attachment Boom Lowering Control Valve).pdf
RENR5818 - Schematic (312C Excavators Hydraulic System - Attachment Stick Lowering Control Valve).pdf
RENR5819 - Schematic (312C Excavators Hydraulic System - Attachment Two Pump Flow).pdf
RENR5823 - Schematic (312C Excavator Hydraulic System - Attachment Combined Flow).pdf
RENR5824 - Schematic (312C Excavators Hydraulic System - Attachment System G 14 Combined Function_ Joystick with Slide Control).pdf
RENR5827 - Schematic (312C Excavators Hydraulic System - Attachment VA Boom).pdf
RENR5828 - Schematic (312C Excavators Hydraulic System - Attachment VA Boom and Combined Flow).pdf
RENR5833 - Systems Operation (312C Excavator Hydraulic System).pdf
RENR5834 - Testing and Adjusting (312C Excavator Hydraulic System).pdf
RENR5836 - Schematic (Caterpillar 312C Excavator Electrical System).pdf
RENR6619 - Schematic (312C Excavators Hydraulic System - Attachment VA Boom With Stick Lowering Control Valve).pdf
RENR6634 - Systems Operation (312C and 315C Excavators Tool Control System).pdf
RENR6634 - Testing and Adjusting (312C and 315C Excavators Tool Control System).pdf
RENR6634 - Troubleshooting (312C and 315C Excavators Tool Control System).pdf
RENR7476 - Disassembly and Assembly (312C Excavator Machine Systems).pdf
PRODUCT DETAILS:
Total Pages: 1,932 pages
File Format: PDF (Internal Links, Bookmarked, Table of Contents, Searchable, Printable, high quality)
Language: English
TABLE OF CONTENTS
RENR5514 - Schematic (312C Excavator Hydraulic System)....3
Main....4
Features....4
Cover Page....5
Information....0
Component Location....6
Fluid Power Symbols....7
Electrical Symbols....8
Schematic....9
Machine Views....0
Machine Component Locations....10
Main Control Valve....11
Pilot Manifold....12
Collage....13
RENR5808 - Specifications (312C Excavator Machine System Specifications)....21
Piston Pump (Main)....23
Control Valve (Main)....27
Pump Lines (Main)....38
Front Lines....40
Boom Lines....42
Boom Cylinder Lines - Right Hand....43
Boom Cylinder Lines - Left Hand....44
Boom Cylinder....45
Boom....48
Boom - Variable....50
Stick Lines....53
Stick Lines - Short....55
Stick Cylinder....57
Stick Cylinder Lines....59
Stick - Medium....62
Stick - Short....64
Stick - Long....66
Bucket Cylinder Lines....68
Bucket Cylinder....70
Bucket....76
Bucket Adjuster....80
Bucket Linkage....81
Hydraulic Tank and Filter....83
Return and Oil Filter Lines....86
Check Valve (Hydraulic Oil Cooler Bypass)....88
Gear Pump (Pilot)....89
Pilot Valve (Oil Manifold)....90
Pilot Valve (Travel)....92
Accumulator (Pilot)....94
Relief Valve (Pilot)....97
Oil Filter (Return)....100
Pilot Lines - Front....103
Pilot Lines - Rear....105
Shuttle Valve (Pilot Lines)....108
Pilot Valve (Joystick)....111
Pilot Valve (Auxiliary)....113
Swing Motor....117
Swing Motor Lines....119
Swing Drive....120
Swing Gear and Bearing....123
Final Drives and Travel Motors....126
Travel Motor Guard....132
Handle Control (Travel)....133
Travel Motor Lines....136
Front Idler....139
Recoil Spring....141
Track Carrier Roller....143
Track Roller (Single Flange)....145
Track Roller Mounting....147
Track Shoe Bolts....149
Fuel Tank....150
Upper Frame....152
Auxiliary Hydraulic Lines - Long Stick....154
Auxiliary Hydraulic Lines - Medium Stick....155
Auxiliary Hydraulic Lines - Long Boom....156
Auxiliary Hydraulic Lines - Short Stick....157
Joystick Control....158
Hydraulic Control (Auxiliary Pedal)....160
RENR5814 - Schematic (312C Excavators Hydraulic System - Attachment Medium Pressure)....161
RENR5815 - Schematic (312C Excavators Hydraulic System - Attachment One Pump with One Way Flow)....163
RENR5816 - Schematic (312C Excavators Hydraulic System - Attachment Quick Couple)....165
RENR5817 - Schematic (312C Excavators Hydraulic System - Attachment Boom Lowering Control Valve)....167
RENR5818 - Schematic (312C Excavators Hydraulic System - Attachment Stick Lowering Control Valve)....169
RENR5819 - Schematic (312C Excavators Hydraulic System - Attachment Two Pump Flow)....171
RENR5823 - Schematic (312C Excavator Hydraulic System - Attachment Combined Flow)....173
RENR5824 - Schematic (312C Excavators Hydraulic System - Attachment System G 14 Combined Function_ Joystick with Slide Control)....175
RENR5827 - Schematic (312C Excavators Hydraulic System - Attachment VA Boom)....177
RENR5828 - Schematic (312C Excavators Hydraulic System - Attachment VA Boom and Combined Flow)....179
RENR5833 - Systems Operation (312C Excavator Hydraulic System)....181
General Information....183
Main Hydraulic System....184
Electronic Control System....189
Pilot Hydraulic System....193
Gear Pump (Pilot)....198
Hydraulic Filter (Pilot)....199
Relief Valve (Pilot)....201
Accumulator (Pilot)....202
Solenoid Valve (Hydraulic Activation)....205
Pilot Valve (Joystick)....210
Solenoid Valve (Proportional Reducing) - Power Shift System....215
Main Hydraulic Pump....219
Pump Control (Main Hydraulic) - Main Pump Regulator....223
Main Control Valve....233
Relief Valve (Main)....245
Relief Valve (Line)....249
Check Valve (Load)....253
Negative Flow Control System....255
Boom Hydraulic System....260
Control Valve (Boom Lowering)....271
Stick Hydraulic System....276
Control Valve (Stick Lowering)....285
Bucket Hydraulic System....290
Cylinders (Boom; Stick and Bucket)....294
Travel Hydraulic System....296
Pilot Valve (Travel and Steering)....304
Travel Motor....307
Travel Parking Brake....311
Displacement Change Valve....314
Travel Counterbalance Valve....320
Oil Makeup (Travel System)....327
Control Valve (Straight Travel)....330
Final Drive....335
Swivel....340
Swing Hydraulic System....343
Swing Motor....351
Pilot Valve (Swing Parking Brake)....355
Relief Valve (Swing)....360
Oil Makeup (Swing System)....363
Relief Valve (Cushion Crossover) - Anti-Reaction Valve....365
Swing Drive....376
Blade Hydraulic System....381
Return Hydraulic System....387
Check Valve (Return Makeup) - Slow Return Check Valve....390
Bypass Valve (Return) - Bypass Check Valve....392
Hydraulic Tank and Filter....394
RENR5834 - Testing and Adjusting (312C Excavator Hydraulic System)....396
General Testing and Adjusting Information....397
Visual Inspection....398
Hydraulic System Pressure - Release....399
Main Hydraulic Pump Air - Purge....404
Operational Checks....407
Engine Performance - Test - Engine Speed....409
Travel on Level Ground - Test - Optional Test....411
Travel on Level Ground - Test....413
Machine Drift on a Slope - Check....416
Swing Speed and Overswing on Level Ground - Check....419
Swing Speed and Swing Drift on a Slope - Check....422
Cylinder Drift - Check - Loaded Bucket....426
Cylinder Drift - Check - Empty Bucket....428
Cylinder Speed - Check - Boom; Stick; and Bucket....433
Relief Valve (Pilot) - Test and Adjust....437
Accumulator (Pilot) - Test and Charge....439
Relief Valve (Main) - Test and Adjust....445
Relief Valve (Line) - Test and Adjust....451
Control Valve (Boom Lowering) - Test and Adjust....459
Control Valve (Stick Lowering) - Test and Adjust....463
Swing Motor - Test - Measurement of Case Drain Oil....465
Relief Valve (Swing) - Test and Adjust....468
Travel Motor - Test - Measurement of Case Drain Oil....472
Relief Valve (Crossover) - Test and Adjust....475
Main Pump (Flow) - Test - Constant Horsepower Flow Control....481
Pump Control (Output Flow) - Adjust....494
Pump Control (Negative Flow) - Test....497
Pump Control (Negative Flow) - Adjust....511
Gear Pump (Pilot) - Test....514
Specifications....519
RENR5836 - Schematic (Caterpillar 312C Excavator Electrical System)....524
Main....525
Collage....527
RENR6619 - Schematic (312C Excavators Hydraulic System - Attachment VA Boom With Stick Lowering Control Valve)....542
RENR6634 - Systems Operation (312C and 315C Excavators Tool Control System)....544
General Information....545
System G 1a One-Way_One Pump_Pedal_Joystick Switch....553
System G 1b One-Way_Two Pump_Pedal_Joystick Switch....556
System G 1c Combined Function_Pedal_Joystick Switch....559
System G 2 Medium Pressure_Auxiliary Pump_Pedal....567
System G 14 Combined Function_Joystick with Slide Control....570
Hydraulic Control....579
Implement Electronic Control Module (Tool)....581
Switches....583
Sensors....593
Senders....596
Solenoid Valves....598
Relays....603
Monitor Overview....604
RENR6634 - Testing and Adjusting (312C and 315C Excavators Tool Control System)....607
Process for Setting Up the Work Tool....609
Service Mode - Enter....610
Machine Tool Control System - Select....615
Work Tool - Select....619
Work Tool Parameter - Program....625
System G 1a Default Value of Work Tool Parameters....632
System G 1a Solenoid Valve (Proportional Reducing) - Calibrate - Negative Flow Control....636
System G 1a Relief Valve (Line) - Test and Adjust....658
System G 1b Default Value of Work Tool Parameters....666
System G 1b Solenoid Valve (Proportional Reducing) - Calibrate - Negative Flow Control....672
System G 1b Relief Valve (Line) - Test and Adjust....694
System G 1c Default Value of Work Tool Parameters....702
System G 1c Solenoid Valve (Proportional Reducing) - Calibrate - Negative Flow Control....714
System G 1c Relief Valve (Line) - Test and Adjust - One-Way System....742
System G 2 Medium Pressure Hydraulic System - Test and Adjust....750
System G14 Default Value of Work Tool Parameters....759
System G14 Joystick Slide Control - Calibrate....785
System G14 Solenoid Valve (Proportional Reducing) - Calibrate - Negative Flow Control....791
System G14 Solenoid Valve (Proportional Reducing) - Calibrate - Attachment Control Valve....818
System G14 Relief Valve (Line) - Test and Adjust - Number 1 Relief Valve and Number 2 Relief Valve....826
System G14 Relief Valve (Line) - Test and Adjust - Auxiliary Control Valve (Medium Pressure)....836
System G14 Relief Valve (Line) - Test and Adjust - Auxiliary Control Valve....839
System G14 Relief Valve (Main) - Test and Adjust - Auxiliary Control Valve (Medium Pressure)....846
Solenoid Valve (Proportional Reducing) - Output Test - Negative Flow Control....848
Switch Status - Check....852
Governor Actuator - Calibrate....856
Electronic Control Module (ECM) - Flash Program....865
Electronic Control Module (ECM) - Replace....866
Connector Contact Identification....867
System Schematic....875
RENR6634 - Troubleshooting (312C and 315C Excavators Tool Control System)....876
General Information....879
Service Tools....880
Electrical Component and Connector Locations....885
Harness and Wire Identification....886
Using Service Mode....888
Visual Inspection....896
Initial Troubleshooting Procedure....897
Diagnostic Code List....900
Using the Operator Monitor to Determine Diagnostic Codes....903
Using Caterpillar Electronic Technician to Determine Diagnostic Codes....906
MID 06A - CID 0145 - FMI 06....908
MID 06A - CID 1522 - FMI 03....911
MID 06A - CID 1522 - FMI 05....914
MID 06A - CID 1522 - FMI 06....918
MID 06A - CID 1523 - FMI 03....921
MID 06A - CID 1523 - FMI 05....924
MID 06A - CID 1523 - FMI 06....927
MID 06A - CID 1593 - FMI 03....930
MID 06A - CID 1593 - FMI 05....933
MID 06A - CID 1593 - FMI 06....936
MID 06A - CID 1594 - FMI 03....939
MID 06A - CID 1594 - FMI 05....942
MID 06A - CID 1594 - FMI 06....945
MID 06A - CID 1595 - FMI 03....948
MID 06A - CID 1595 - FMI 05....951
MID 06A - CID 1595 - FMI 06....954
MID 06A - CID 1596 - FMI 03....957
MID 06A - CID 1596 - FMI 05....960
MID 06A - CID 1596 - FMI 06....963
MID 06A - CID 1597 - FMI 03....966
MID 06A - CID 1597 - FMI 05....969
MID 06A - CID 1597 - FMI 06....972
MID 06A - CID 1598 - FMI 03....975
MID 06A - CID 1598 - FMI 05....978
MID 06A - CID 1598 - FMI 06....981
MID 06A - CID 1609 - FMI 03....984
MID 06A - CID 1609 - FMI 04....989
MID 06A - CID 1615 - FMI 03....991
MID 06A - CID 1615 - FMI 05....994
MID 06A - CID 1615 - FMI 06....997
MID 06A - CID 1657 - FMI 03....1000
MID 06A - CID 1657 - FMI 04....1005
MID 06A - CID 1658 - FMI 03....1008
MID 06A - CID 1658 - FMI 04....1013
MID 06A - CID 1665 - FMI 03....1016
MID 06A - CID 1665 - FMI 05....1019
MID 06A - CID 1665 - FMI 06....1022
MID 06A - CID 1666 - FMI 03....1025
MID 06A - CID 1666 - FMI 05....1028
MID 06A - CID 1666 - FMI 06....1031
MID 069 - CID 1524 - FMI 03....1034
MID 069 - CID 1524 - FMI 05....1037
MID 069 - CID 1524 - FMI 06....1040
MID 069 - CID 1590 - FMI 03....1043
MID 069 - CID 1590 - FMI 05....1046
MID 069 - CID 1590 - FMI 06....1049
Solenoid Valve (Work Tool)....1052
Pressure Switch (Work Tool)....1057
Pressure Switch (Medium)....1066
Rocker Switch (One-Way_Two-Way)....1075
Rocker Switch (One Pump_Two Pump)....1082
RENR7476 - Disassembly and Assembly (312C Excavator Machine Systems)....1088
Duo-Cone Conventional Seals - Install....1094
Hydraulic System Pressure - Release....1107
Blade Cylinder - Remove....1112
Blade Cylinder - Install....1115
Blade - Remove and Install....1118
Bucket - Remove....1124
Bucket - Install....1128
Bucket Linkage - Remove....1134
Bucket Linkage Bearings and Seals - Remove....1136
Bucket Linkage Bearings and Seals - Install....1139
Bucket Linkage - Install....1142
Bucket Cylinder - Remove....1145
Bucket Cylinder - Disassemble....1148
Bucket Cylinder - Assemble....1150
Bucket Cylinder - Install....1153
Stick Cylinder - Remove....1157
Stick Cylinder - Disassemble....1160
Stick Cylinder - Assemble....1163
Stick Cylinder - Install....1166
Stick - Remove....1169
Stick Bearings and Seals - Remove....1173
Stick Bearings and Seals - Install....1175
Stick - Install....1178
Boom Cylinder - Remove....1181
Boom Cylinder - Disassemble....1184
Boom Cylinder - Assemble....1187
Boom Cylinder - Install....1190
Boom - Remove....1193
Boom Bearings and Seals - Remove....1198
Boom Bearings and Seals - Install....1200
Boom - Install....1202
Window Wiper Motor - Remove and Install - Upper....1206
Window Wiper Motor - Remove and Install - Lower....1215
Boom Lighting - Remove and Install....1221
Counterweight - Remove and Install....1223
Fuel Tank - Remove....1227
Fuel Tank - Install....1234
Check Valve (Cooler Bypass) - Remove....1240
Check Valve (Cooler Bypass) - Disassemble....1244
Check Valve (Cooler Bypass) - Assemble....1246
Check Valve (Cooler Bypass) - Install....1248
Handle (Joystick) - Remove and Install....1252
Hydraulic Lockout Control - Remove....1257
Hydraulic Lockout Control - Disassemble....1259
Hydraulic Lockout Control - Assemble....1263
Hydraulic Lockout Control - Install....1267
Storage Box and Covers (Cab) - Remove and Install....1269
Heating and Air Conditioning Unit - Remove....1274
Heating and Air Conditioning Unit - Install....1283
Blower Motor (Air Conditioner; Heater) - Remove....1291
Actuator Motor (Air Distributor) - Remove and Install....1297
Speed Control - Remove and Install - Blower Linear Control....1312
Temperature Sensor (Ambient Air) - Remove and Install....1314
Coolant Temperature Sensor - Remove and Install....1317
Sensor (Sunlight) - Remove....1320
Sensor (Sunlight) - Install....1322
Temperature Sensor (Cab Air) - Remove and Install....1324
Heater Core - Remove....1336
Heater Core - Install....1340
Evaporator Coil - Remove....1343
Evaporator Coil - Install....1354
Pressure Switch (Refrigerant Pressure Cutoff) - Remove....1365
Pressure Switch (Refrigerant Pressure Cutoff) - Install....1368
Control Panel (Air Conditioner) - Remove....1371
Control Panel (Air Conditioner) - Install....1375
Track Carrier Roller - Remove....1379
Track Carrier Roller - Install....1382
Track Roller - Remove....1384
Track Roller - Install....1388
Track - Separate....1391
Track - Connect....1395
Front Idler and Recoil Spring - Remove....1398
Recoil Spring - Disassemble....1400
Recoil Spring - Assemble....1405
Front Idler and Recoil Spring - Install....1410
Track Adjuster - Remove....1412
Track Adjuster - Disassemble....1414
Track Adjuster - Assemble....1416
Track Adjuster - Install....1419
Final Drive Sprocket - Remove and Install....1421
Final Drive and Travel Motor - Remove....1425
Final Drive and Travel Motor - Disassemble....1429
Final Drive and Travel Motor - Assemble....1452
Final Drive and Travel Motor - Install....1477
Swivel - Remove....1480
Swivel - Disassemble....1483
Swivel - Assemble....1485
Swivel - Install....1488
Solenoid Valve (Rotate) - Remove....1491
Solenoid Valve (Rotate) - Install....1496
Solenoid Valve (Two-Way Flow and One Pump_Two Pump) - Remove....1500
Solenoid Valve (Two-Way Flow and One Pump_Two Pump) - Install....1511
Swing Motor - Remove....1520
Swing Motor - Disassemble....1523
Swing Motor - Assemble....1533
Swing Motor - Install....1542
Swing Drive - Remove....1545
Swing Drive - Disassemble - Older Style....1548
Swing Drive - Assemble - Older Style....1563
Swing Drive - Install....1580
Undercarriage Frame - Remove....1583
Undercarriage Frame - Install....1590
Swing Gear and Bearing - Remove and Install....1597
Tank and Filter (Hydraulic) - Remove....1602
Tank and Filter (Hydraulic) - Install....1611
Accumulator - Remove and Install....1620
Pressure Reducing Valve - Remove and Install....1623
Gear Pump (Pilot) - Remove and Install....1629
Blade Pump - Remove and Install....1633
Pump Control - Remove....1636
Pump Control - Disassemble....1639
Pump Control - Assemble....1644
Pump Control - Install....1650
Main Hydraulic Pump - Remove....1653
Main Hydraulic Pump - Disassemble....1660
Main Hydraulic Pump - Assemble....1669
Main Hydraulic Pump - Install....1686
Auxiliary Pilot Valve (Straight Travel) - Remove....1693
Auxiliary Pilot Valve (Straight Travel) - Disassemble....1696
Auxiliary Pilot Valve (Straight Travel) - Assemble....1698
Auxiliary Pilot Valve (Straight Travel) - Install....1700
Alternate Pattern Control Valve - Remove....1702
Alternate Pattern Control Valve - Disassemble....1705
Alternate Pattern Control Valve - Assemble....1707
Alternate Pattern Control Valve - Install....1710
Pilot Valve (Joystick) - Remove....1711
Pilot Valve (Joystick) - Disassemble....1716
Pilot Valve (Joystick) - Assemble....1722
Pilot Valve (Joystick) - Install....1729
Pilot Valve (Implement) - Remove....1734
Pilot Valve (Implement) - Disassemble....1737
Pilot Valve (Implement) - Assemble....1741
Pilot Valve (Implement) - Install....1745
Pilot Valve (Oil Manifold) - Remove - NFC Limit Valve....1747
Pilot Valve (Oil Manifold) - Remove....1751
Pilot Valve (Oil Manifold) - Disassemble....1754
Pilot Valve (Oil Manifold) - Disassemble - NFC Limit Valve....1760
Pilot Valve (Oil Manifold) - Assemble....1763
Pilot Valve (Oil Manifold) - Assemble - NFC Limit Valve....1769
Pilot Valve (Oil Manifold) - Install....1772
Pilot Valve (Oil Manifold) - Install - NFC Limit Valve....1775
Pilot Valve (Travel) - Remove....1778
Pilot Valve (Travel) - Disassemble....1783
Pilot Valve (Travel) - Assemble....1794
Pilot Valve (Travel) - Install....1806
Shuttle Valve - Remove - Auxiliary Control....1810
Shuttle Valve - Remove - Straight Travel....1813
Shuttle Valve - Disassemble - Straight Travel....1816
Shuttle Valve - Disassemble - Auxiliary Control....1818
Shuttle Valve - Assemble - Auxiliary Control....1820
Shuttle Valve - Assemble - Straight Travel....1822
Shuttle Valve - Install - Straight Travel....1824
Shuttle Valve - Install - Auxiliary Control....1827
Main Control Valve - Remove....1829
Main Control Valve - Disassemble....1835
Main Control Valve - Assemble....1871
Main Control Valve - Install....1904
Caterpillar 312C Excavators Repair Service Manual
