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Caterpillar 312B Excavator Repair Manual — Wiring Diagrams

$49.95

Model: 312B | 312B L
Type: Excavator
Serial: 6SW | 9NW | 9FS | 2KW
3973 Pages·282 MB·Searchable PDF·English·Print-Ready
  • ✓ Wiring Diagrams
  • ✓ Hydraulic Schematics
  • ✓ Multi-Level Bookmarks (4-level navigation)

Same factory service manual used by authorized dealer technicians.

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Caterpillar 312B excavator repair manual, air inlet and exhaust system: turbocharger operation, showing the compressor and turbine wheels carried on a common shaft and the path of inlet air into the engine.
Caterpillar 312B Excavator Repair Manual — Wiring Diagrams
$49.95

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This is the full factory repair library for the Cat 312B and 312B L, not an operator's booklet. It walks the 3054 engine from cylinder head to crankshaft, covers the Stanadyne injection pump with testing and timing adjustment, and gives real numbers - wastegate opens at 88 +/- 4 kPa (12.8 +/- 0.6 psi), exhaust manifold pulls to 44 N.m (33 lb ft). Hydraulics get the deepest coverage: main and pilot valve circuits, travel motor and anti-reaction valves, swing parking-brake solenoid, drift-reduction valves and the blade circuit. Add final drive and swing gear work, track adjuster and idler service, boom/stick/bucket pin replacement, 15 bucket configurations, full torque tables, and foldout hydraulic and electrical schematics for S/N 6SW, 9NW, 9FS and 2KW machines.

What's Inside This Caterpillar 312B, 312B L Repair Manual

SystemPagesKey Topics
Air Inlet and Exhaust System1-66Naturally Aspirated vs. Turbocharged Operation, Turbocharger Components and Function, Wastegate Operation and Testing, Air Cleaner Inspection and Maintenance, Exhaust Temperature Testing
Basic Engine67-409Cylinder Block and Cylinder Head, Crankshaft and Main Bearings, Camshaft and Valve Train, Piston, Ring and Connecting Rod Service
Cooling System410-479Radiator and Coolant-Level Test Procedure, Water Temperature Regulator (Thermostat), Fan Drive and Belt Tension, Coolant Specifications
Electrical and Starting System - Systems Operation480-1090VIMS Monitor Panel and Instrument-Panel Operation, EquipmentManager / Product Link Software Setup, Service Meter and Repair-History Logging, Fuel-Use and Idle-Time Reporting, User Checklist and Login Administration
Electrical and Starting System - Testing and Adjusting1091-1391Air Inlet Heater Circuit Leak Test, VIMS/ECM Module Presence and Wiring Verification, Digital Multimeter Resistance and Voltage Checks, Monitor Character-Display Diagnostic Entry
Electrical and Starting System - Troubleshooting, Specifications & Disassembly1392-1664Wiring/Connector Fault-Tracing Conventions, Event and Diagnostic Code Handling (Do-Not-Clear Caution), Alternator Charging System High-Idle Test, Connector/Terminal Specifications and Housing Installation
Engine Arrangement1665-1719Engine Design and Configuration Overview, Worn Piston Ring Symptoms, Crankcase Breather Routing, Loose Alternator Belt Diagnosis, General Engine Identification Information
Frame and Body1720-1765Counterweight Removal and Installation, Swing Drive Disassembly and Assembly, Upper Structure to Undercarriage Frame Separation, Swing Gear and Bearing Replacement, Fan Guard and Hood Removal
Fuel System1766-1930Stanadyne Fuel Injection Pump Operation, Fuel Return-Line Circuit, Injection Pump Testing and Timing Adjustment, Fuel Filter and Injector Disassembly and Specifications
Hydraulic System1931-2664Main and Pilot Control Valve Circuit Operation, Boom and Stick Drift-Reduction Valves, Swing Parking-Brake Solenoid Valve, Travel Motor and Anti-Reaction Valve Circuits, Blade Circuit and Proportional Reducing Valve
Implements2665-2724Boom Removal, Installation and Bearing/Seal Replacement, Stick (Short/Medium/Long Variant) Removal and Installation, Bucket-Linkage Removal and Bearing/Seal Replacement, Grease-Line Routing for Boom and Stick
Lubrication System2725-2778Engine Oil Pump Inner/Outer Rotor Clearance Measurement, Lubrication Circuit Operation, Oil Pump Disassembly and Specifications
Machine Arrangement2779-2790Scheduled Service-Interval Reference, Heating and Air-Conditioning Service Publication Index
Operator Station - Systems Operation2791-2971HVAC Air-Inlet and Defroster Controls, Automatic Temperature-Control Switch Operation, Cab/Operator-Station System Layout
Operator Station - Testing and Adjusting2972-3339Fuse-Circuit Continuity Test, Air-Conditioning Pressure/Temperature Charge Chart, A/C Refrigerant Recommended Charge Weight, Diagnostic Test Result Checklist
Operator Station - Troubleshooting, Specifications & Disassembly3340-3638A/C Refrigerant Leak Detection and Recovery Procedure, Blower Motor and Evaporator Airflow Troubleshooting, Relief-Valve and Suppressor Wiring Checks, Blower-Wheel Rotation and Damper Positioning Checks
Power Train3639-3731Duo-Cone Conventional Seal Installation, Final Drive Disassembly and Assembly, Final-Drive Sprocket Replacement, Track Roller Service, Track Separation and Connection
Service Equipment and Supplies3732-3781Service Equipment Operation and Testing, Coolant-System Safety Precautions, Disassembly and Assembly of Service Equipment Components
Torque Specifications3782-3826Metric (ISO) and English (SAE) Fastener Torque Tables, Ground Engaging Tool (G.E.T.) Fastener Torque, O-Ring, Flare and Pipe-Thread Fitting Installation Torque, Hose-Clamp Torque Values - Universal Caterpillar/Mitsubishi Chart, Not Machine-Specific
Undercarriage3827-3892Track Adjuster Removal, Disassembly and Assembly, Front Idler and Recoil-Spring Service, Track Carrier-Roller Disassembly and Assembly, Track Roller Disassembly and Assembly
Work Tools3893-3936Multiple Bucket Variant Specifications (15 Configurations), Bucket Pin-Bore and Retaining-Nut Dimensions, Bucket Adjuster and Quick-Coupler Service, Bucket Removal and Installation Procedure
Schematics (Foldout Diagram Set)3937-3973312/312B/312B L Medium-Pressure Hydraulic Schematic (Attachment), Single/Double-Action One-Pump Hydraulic Variants, Stick-Lowering Control Valve Hydraulic Circuit, 312B and 312B L Electrical Wiring Schematic (S/N 6SW, 9NW, 9FS, 2KW), Hydraulic System with Blade Schematic, Fluid Power / Electrical Graphic Symbol Legend

Quick Reference Specifications

SpecificationValuePage
Wastegate opening pressure (2674A081)88 +/- 4 kPa (12.8 +/- 0.6 psi)p. 12
Exhaust manifold tightening torque44 N.m (33 lb ft)p. 23
Muffler nut tightening torque30 +/- 7 N.m (22 +/- 5 lb ft)p. 44
Turbocharger shaft end play (min).03 mm (.001 inch)p. 49
Air inlet heater voltage12 voltsp. 50
BrandCaterpillar
Model312B, 312B L
Machine TypeExcavator
Manual TypeRepair Manual
LanguageEnglish
FormatSearchable PDF (Digital Download)
Pages3,973
File Size282 MB
Serial Range6SW, 9NW, 9FS, 2KW
Wiring DiagramsYes
Hydraulic SchematicsYes
Torque SpecificationsNo
Bookmarked / IndexedYes
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