Caterpillar 311, 312 Repair Manual — Wiring Diagrams

Name: Caterpillar 311, 312 Repair Manual — Wiring Diagrams
Author: Caterpillar

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$39.95 USD · one-time payment

Model: 311 | 312

Type: Excavator

Years: 1995-2003

Serial: 9LJ00262-UP

2580 Pages·214 MB·Searchable PDF·English·Print-Ready

✓ Wiring Diagrams
✓ Hydraulic Schematics
✓ Torque Specs
✓ Multi-Level Bookmarks (3-level navigation)

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This is the factory repair manual for the Caterpillar 311 and 312 hydraulic excavators built from 1995 to 2003, both machines in one bundle. It covers the 3064 engine from cylinder head to crankshaft, the fuel injection pump and governor, and the full hydraulic system - main pump, control valves, swing and travel motors, relief valves and the accumulator. You get the actual test numbers: 34300 kPa (5000 psi) main relief on travel, 3450 kPa (500 psi) pilot pressure, cycle times for boom, stick, bucket, swing and travel on both models. Electrical coverage includes the alternator, starter, monitor system, sensors and harness continuity testing, plus complete hydraulic and electrical schematics for the 311 and 312. Undercarriage, implements and torque specifications round it out.

Other edition of this manual

Caterpillar 312 Excavator Repair Manual — Wiring Diagrams $89.95

What's Inside This Repair Manual

System	Pages	Key Topics
Air Inlet & Exhaust	1-10	Air Heater, Air Cleaner, Muffler, Turbocharger
Basic Engine	11-46	Cylinder Head, Pistons, Crankshaft, Camshaft, Valve Mechanism
Cooling System	47-70	Water Pump, Radiator, Oil Cooler, Thermostat
Electrical & Starting System	71-840	Alternator, Starter, Batteries, Monitor System, Sensors, Wiring Harness Testing, System Schematic
Engine Arrangement	841-853	Engine Mounting, Engine Supports
Frame & Body	854-869	Main Frame, Guards, Covers
Fuel System	870-1042	Injection Pump, Injectors, Fuel Transfer Pump, Governor
Hydraulic System	1043-1639	Main Pump, Pilot Pump, Main Control Valves, Swing Motor & Drive, Travel Motor & Final Drive, Relief Valves, Accumulator, Cycle Times, Pressure Testing & Adjusting
Implements	1640-1711	Boom, Stick, Bucket, Cylinders, Linkage
Lubrication System	1712-1720	Engine Oil Pump, Oil Filter, Oil Cooler
Machine Arrangement	1721-1732	Overall Layout, Component Location
Operator Station	1733-2272	Cab, Controls, Seat, HVAC, Monitor Panel
Power Train	2273-2334	Travel Motor, Final Drive, Swing Drive & Bearing
Schematics	2335-2417	311 & 312 Hydraulic System Schematics, 311 & 312 Electrical System Schematics, Pilot & Attachment Circuits
Service Equipment & Supplies	2418-2466	Special Tools, Shop Supplies
Torque Specifications	2467-2514	Fitting Torques, Track Adjuster Torques
Undercarriage	2515-2572	Track Chain, Track Adjuster, Rollers, Idler, Sprocket
Work Tools	2573-2580	Bucket, Attachments

Quick Reference Specifications

Specification	Value	Page
312
Hydraulic pump flow (main pump, no load), 312	120 liter/min (32 U.S.gpm)	p. 1043
Engine speed (high idle), 312	1980 ± 80 rpm	p. 1341
Oil temperature	55 ± 5°C (131 ± 9°F)	p. 1341
Boom raise cycle time, 312	3.2 ± 0.5 seconds	p. 1341
Boom lower cycle time, 312	2.6 ± 0.5 seconds	p. 1341
Stick out cycle time, 312	2.5 ± 0.5 seconds	p. 1341
Stick in cycle time, 312	3.9 ± 0.5 seconds	p. 1341
Bucket close cycle time, 312	3.7 ± 0.5 seconds	p. 1341
Bucket open cycle time, 312	2.1 ± 0.5 seconds	p. 1341
Swing cycle time, 312	4.4 or less seconds	p. 1341
Travel cycle time at high speed, 312	14.0 or less seconds	p. 1341
Travel cycle time at low speed, 312	20.5 or less seconds	p. 1341
311
Hydraulic pump flow (main pump, no load), 311	108 liter/min (29 U.S.gpm)	p. 1043
Line relief valve pressure setting (bucket cylinder head end)	26 000 kPa (3750 psi)	p. 1043
Engine speed (high idle), 311	1880 ± 80 rpm	p. 1341
Oil temperature	55 ± 5°C (131 ± 9°F)	p. 1341
Boom raise cycle time, 311	2.9 ± 0.5 seconds	p. 1341
Boom lower cycle time, 311	2.4 ± 0.5 seconds	p. 1341
Stick out cycle time, 311	2.0 ± 0.5 seconds	p. 1341
Stick in cycle time, 311	3.5 ± 0.5 seconds	p. 1341
Bucket close cycle time, 311	4.1 ± 0.5 seconds	p. 1341
Bucket open cycle time, 311	2.4 ± 0.5 seconds	p. 1341
Swing cycle time, 311	4.2 or less seconds	p. 1341
Travel cycle time at high speed, 311	14.1 or less seconds	p. 1341
Travel cycle time at low speed, 311	20.3 or less seconds	p. 1341
311 & 312
Hydraulic pump flow (pilot pump, full rpm)	15 liter/min (4.0 U.S. gpm)	p. 1043
Pilot system pressure (relief setting)	3450 kPa (500 psi)	p. 1043
cylinder circuits
Line relief valve pressure setting (general)	31 400 kPa (4550 psi)	p. 1043
main hydraulic system
Main relief valve pressure setting (travel operation)	34 300 kPa (5000 psi)	p. 1043
Main relief valve pressure setting (implement/swing operation)	27 500 kPa (4000 psi)	p. 1043
Swing Motor
Maximum case drain oil (new swing motor)	15 liter/min (4.0 U.S. gpm)	p. 1043
Maximum case drain oil (rebuilt swing motor)	17 liter/min (4.5 U.S. gpm)	p. 1043
Swing relief pressure setting	23000 ± 980 kPa (3350 ± 140 psi)	p. 1043
Travel Motor
Maximum case drain oil (new travel motor)	20 liter/min (5.3 U.S. gpm)	p. 1043
Maximum case drain oil (rebuilt travel motor)	23 liter/min (6.1 U.S. gpm)	p. 1043
Main relief pressure	34300 ± 490 kPa (5000 ± 72 psi)	p. 1043
Accumulator
Nitrogen gas pressure	1770 ± 100 kPa (255 ± 14 psi)	p. 1043
Torque for cap (1)	2.9 ± 0.2 N·m (2 ± 1 lb ft)
Radiator & Oil Cooler
Weight of the radiator & oil cooler	68 kg (150 lb)
Oil Cooler
Weight of the oil cooler	36 kg (80 lb)
Counterweight
Weight of the counterweight	1453 kg (3200 lb)

Brand	Caterpillar
Model	311, 312
Machine Type	Excavator
Manual Type	Repair Manual
Language	English
Format	Searchable PDF (Digital Download)
Pages	2,580
File Size	214 MB
Year Range	1995-2003
Serial Range	9LJ00262-UP
Wiring Diagrams	Yes
Hydraulic Schematics	Yes
Torque Specifications	Yes
Bookmarked / Indexed	Yes

Caterpillar 311, 312 Repair Manual — Wiring Diagrams

Other edition of this manual

What's Inside This Repair Manual

Quick Reference Specifications

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