11
Engine
Engine Model Cat
®
C4.2 ACERT™
Gross Power 72 kW 97 hp
Net Power 67 kW 90 hp
SAE J1349 67 kW 90 hp
Bore 102 mm 4.02 in
Stroke 130 mm 5.12 in
Displacement 4.25 L 259.3 in
3
• Net power advertise is the power available
at the flywheel when the engine is equipped
with fan, air cleaner, muffler and alternator.
• No engine derating required below 2300 m
(7,500 ft) altitude.
• The 312D meets U.S. EPA Tier 3 and
EU Stage IIIA Directive/97/68/EC
emissions requirements.
Weights
Operating Weight – 12 920 kg 28,480 lb
Standard Undercarriage
Operating Weight – 13 450 kg 29,650 lb
Long Undercarriage
• Standard undercarriage: 500 mm (20") shoe,
3.0 m (9'10") stick, 0.52 m
3
(0.68 yd
3
) bucket.
• Long undercarriage: 600 mm (24") shoe,
3.0 m (9'10") stick, 0.52 m
3
(0.68 yd
3
) bucket.
Swing Mechanism
Swing Torque 30 950 N·m 22,827.5 lb ft
Swing Speed 12.4 rpm
Drive
Maximum 114 kN 25.6 lb
Drawbar Pull
Travel Speed 5.5 km/h 3.4 mph
Hydraulic System
Main Implement 127 L/min 33.5 gal/min
System – Maximum
Flow (2x)
Maximum Pressure 30 500 kPa 4,424 psi
– Implements
Maximum Pressure 35 000 kPa 5,076 psi
– Travel
Maximum Pressure 23 000 kPa 3,336 psi
– Swing
Pilot System – 36 L/min 9.51 gal/min
Maximum Flow
Pilot System – 4120 kPa 598 psi
Maximum Pressure
Boom Cylinder 110 mm 4.3 in
– Bore
Boom Cylinder 1015 mm 39.9 in
– Stroke
Stick Cylinder 120 mm 4.7 in
– Bore
Stick Cylinder 1197 mm 47.1 in
– Stroke
Bucket Cylinder 100 mm 3.9 in
– Bore
Bucket Cylinder 939 mm 36.9 in
– Stroke
Service Refill Capacities
Fuel Tank 250 L 66 gal
Cooling System 17.9 L 4.73 gal
Engine Oil 19.5 L 5.1 gal
Swing Drive 3 L 0.79 gal
Final Drive (Each) 3 L 0.79 gal
Hydraulic System 162 L 42.8 gal
(Including Tank)
Hydraulic Tank 150 L 39.6 gal
Standards
Cab/FOGS SAE J1356 FEB88
ISO 10262
Sound Performance
Performance:
• The operator sound exposure Leq (equivalent
sound pressure level) measured according
to the work cycle procedures specified in
ANSI/SAE J1166 OCT 98 is 73 dB(A), at
standard ambient, for the cab offered by
Caterpillar, when properly installed and
maintained and tested with the doors and
windows closed.
• Hearing protection may be needed when
operating with an open operator station and
cab (when not properly maintained or doors/
windows open) for extended periods or in
noisy environment.
312D/312D L Hydraulic Excavator Specifications
