312C

312C L
Hydraulic Excavators

Cat® turbocharged 3064 T diesel engine

Gross power 70 kW/94 hp
Flywheel power 67 kW/90 hp
Operating weight range 12 700 to 15 150 kg
Travel speed – 312C/312C L 5.5/5.1 km/h
Drawbar pull – 312C/312C L 108/126 kN
312C and 312C L Hydraulic Excavators
Improved performance and rugged durability combine to maximize productivity.

Operator Station Multipro Electronic Control System Engine

Roomy and quiet with ergonomic An user friendly new monitor that ✔ The 312C is powered by the Cat 3064 T
control placement has excellent shows a wide variety of useful engine which complies with worldwide
sightlines to the work area to help keep information for machine operation emissions requirements. This engine
operator fatigue low and production up and provides high efficient service includes several design features which
throughout the entire shift. Optional data and diagnostic capabilities enhance performance, efficiency and
climate control maintains constant while maximizing fuel efficiency reliability. Engine service intervals are
temperature in the cab in both hot and and performance. pg. 6 at 500 hours. pg. 7
cold weather. pg. 4-5

Improved performance.
Increased horsepower, better controllability,
extended service intervals, optimized VA
boom structure, a revolutionary tool control
system and a redesigned ergonomic operator
station increase your productivity and lower
your operating costs.

✔ New feature

2
Hydraulics Serviceability Structures
The open-center, two-pump hydraulic Longer service intervals and easier Caterpillar design and manufacturing
system features pump flow control maintenance results in better machine techniques assure outstanding durability
which improves fuel efficiency, ensures availability and lower owning and and service life from these important
smooth controllability, reduces sound operating costs. Electronic diagnostics components. pg. 11
levels and extends component life, means increased productivity. pg. 9
through an increased maximum flow.
The unique tool control option offers
the ability to optimize the machine
performances according to 5 tool
specifications, and to set priorities Undercarriage and Blade Buckets and Teeth
between tools and implements for Rugged Caterpillar® undercarriage design A wide variety of bucket types
maximized efficiency. pg. 8 and proven structural manufacturing with aggressive bucket designs
techniques assure outstanding durability take advantage of the 312C L’s higher
in the toughest applications, resulting in power to improve productivity.
stability, durability and low maintenance. pg. 12
Blade option adds versatility. Standard
grease-lubricated tracks extend the
undercarriage life. pg. 10

Work Tools
Ex-factory available Buckets, Multi-
processors, Sorting and Demolition
Grapples, Hammers and Quick
Couplers provide a total solution
package to the end-user. pg. 13

Complete Customer Service

Your Cat dealer offers a wide range of
services that can be set up under a
customer support agreement when you
purchase your equipment. The dealer
will help you choose a plan that can
cover everything from machine and
attachment selection to replacement.
pg. 14

3
Operator Station
Designed for comfort and ease of operation.

4
 Operator work station. This operator 1 Multipro Electronic Control System.
work station is quiet with ergonomic Caterpillar monitor panel includes fuel
control placement and convenient level, hydraulic oil temperature and
adjustments, low lever and pedal engine temperature gauges, machine
effort, ergonomic seat design, and condition indicators, and operator
highly efficient ventilation. controls in a single console (refer to
Multipro on pg. 6).
Viewing area. Excellent viewing area
through large, wide windows. A large 2 Joysticks. Joysticks control all
skylight provides upward visibility. implements and swing functions with
The upper front window features minimal effort. This includes 4 switches
parallelogram wiper to provide un- on each joystick. The integrated joystick
obstructed front viewing. The upper consoles adjust to operator preference.
left side door window can slide open. Joystick consoles are suspended as part
The lower window provides visibility of the seat arrangement. Special joystick
to the tracks and the ground next to for the tool control option feature
the machine. The rear window offers modulated switches.
a good view behind and to the left,
3 Travel controls. Hand or foot actuated
aided by a lower hood profile.
travel controls allow the operator to
Greater control convenience. move the excavator while working the
Each of the controls is positioned boom, stick and bucket. Hand levers
within easy reach of the operator. are easily removable.
Cab shell. The double wall, pressed 4 Activation control lever. Hydraulic
cab shell is mounted to the swing activation control lever deactivates
frame using viscous mounts for hydraulic functions and prevents start-
reduced sound and vibrations. up when the operator exits the cab.
Wiper. A standard large wiper for 5 Suspension seat. The fully adjustable
the upper and lower windows offers suspension seat includes an impressive
the selection between continuous range of comfort features. In addition to
and intermittent modes and provides fore/aft height and weight adjustments,
a better visibility. it also offers wide arm support, headrest
and a retractable seat belt. The height
Dial throttle. Dial throttle with ten
adjustment system of the seat and
settings for simple, precise repeatable
console allows to adjust them together,
engine speed adjustment.
while the console height can be also
Automatic climate control. Optional adjusted independently. Moreover,
automatic climate control maintains the armrest also has its owns height
constant temperature in the cab in both adjustment mechanism, providing good
hot and cold weather conditions and, access to control levers.
at the touch of a switch, the operator
can choose between fresh or
recirculated air.

Special joysticks for tool control

options.

5
Multipro
The Multipro manages the engine and hydraulics for maximum performance and enhanced
monitoring capabilities through a new user friendly interface.

4
2
3

Multipro. It controls state-of-the-art Pump Flow and Pressure Settings. Filter and Oil Warnings. The monitor
hydraulics and engine performance for The 312C monitor is capable of provides the number of hours that filter
maximized productivity, increased fuel recording five hydraulic pump flow and fluids have been used. It also
efficiency, and lower emission and and hydraulic pressure settings for displays filter and oil change warnings
sound levels. various tools. This function is very when the number of hours used reaches
convenient because it eliminates the the maintenance interval.
Compact monitor. The 312C uses
need to adjust the hydraulics every time
a compact monitor that nevertheless The 312C monitor consists of
a tool is changed and instantly provides
shows a variety of information. five areas:
the operator with the correct setting
The 312C monitor uses a liquid crystal 1 Alert indicator
of flow and pressure for each tool.
display, and the dot matrix screen is 2 Engine speed dial indicator
capable of displaying a wide range of Alert. This monitor is capable of auto- 3 Gauges
items, such as written messages. diagnostic and is designed to alert an 4 Message area
It consists of an 8-key keyboard that impending problem to the operator. 5 Key pad
makes it user friendly to the operator.
Languages. In addition to icons,
the 312C monitor displays language-
based information identifying various
functions. 20 different display
languages are available.

6
Cat 3064 T Engine
The 4-cylinder turbocharged engine is built for power, reliability, economy and
easy maintenance.

Cat 3064 T Engine. The 312C is powered Automatic Engine Control. Fuel System. Efficient direct injection
by a Cat 3064 T diesel engine, built for The automatic engine control (AEC) fuel system means lower operating cost.
world-class performance and reliability, maximizes fuel efficiency and reduces
Fuel Consumption. The 3064 T engine
low maintenance, long life and sound levels. The control automatically
has the best fuel consumption in this
excellent fuel economy for low reduces engine speed to suit application.
class of diesel engines. It features
operating costs. For further ease and control, a one-
■ The 3064 T engine complies with
improved thermal efficiency and
touch low idle button on the right
reduced friction resistance between
Stage II Emission Directive joystick lever will also reduce engine
piston and liners.
97/68/EC. levels, conserve fuel and reduce engine
■ The oil filter, oil level gauge, fuel sound levels. Operators can use the low- Crankshaft. Eight balance, one-piece,
filter and priming pump are located idle button at any time, such as between forged crankshaft enhances balance and
on the top of the engine for easy cycles when loading trucks. decreases vibration and is induction
maintenance. hardened to improve abrasion
■ Big capacity of the samp and the oil
Starting Performance. To avoid white
resistance.
smoke during cold starting, the 3064 T
cartridge allows to reinforce the
engine is equipped with an air heater on Pistons. Heat resistant aluminum alloy
maintenance intervals at 500 hours.
the inlet manifold. pistons have a short compression
Torque Rise. The engine is designed for height, reducing weight and improving
Closed Breather (option). For certain
high torque rise at middle rpm, a feature efficiency.
countries, closed breather circuit is
that is especially beneficial for heavy-
available.
duty use.
Compact Design. Designed to be as
compact as possible while maintaining
high performance and excellent
response.

7
Hydraulics
Caterpillar hydraulics deliver power and control to keep material moving at high volume.

Tool selection.
5 tools settings can be programmed and
selected from the monitor:
– drastic reduction of mistake risk
– quick installation of a tool
– less repairs
– higher tool life
– automatic tool setting by single
monitor selection
– full operation from joysticks
Controllability. The hydraulic system
offers precise control of the 312C,
reducing operator fatigue, improving
operator effectiveness and efficiency,
which ultimately translates into
enhanced performance.
Auxiliary Hydraulic Valve.
The auxiliary hydraulic valve is
standard of the 312C for use with
optional hydraulic circuits.
Hydraulic Snubbers. Hydraulic cylinder
snubbers at the rod-end of boom
cylinders and both ends of the stick
cylinders cushion shocks, reduce sound
and increase cylinder life.
Oil sampling. Scheduled oil sampling
allows for scheduled replacement or
Component Layout. The 312C hydraulic Automatic Boom and Swing Priority. repair of components before the
system was designed to provide a high For simpler operation, work mode machine is stopped because of a major
level of efficiency. With all major and power mode switches have been breakdown.
components located close together, eliminated. Instead, the automatic boom
Tool Control. With the tool control
shorter tubes and lines are needed, and swing priority function selects
(option), the machine is being provided
resulting in less friction loss in the lines the best engine and pump regulation,
with an electronic additional
and reduced pressure drops. based on joystick movement.
programmable stackable valve and
Hydraulic Cross Sensing System. Stackable Valves. Three types of the ability to optimize the machine
Improves productivity with faster stackable valves are available on the performances according to 5 tool
implement speeds and quicker, 312C and attached directly to the main specifications (including settings for
stronger pivot turns. control valve. Up to two stackable electrical relief valve for hammer
valves can be used in combination circuit and flow). Flow distribution
Hydraulic connections. Use of O-ring
with the main control valve to provide between implements is analyzed and
face seals on all high-pressure and pilot
a variety of different functions. optimized, with the ability to set priority
circuits reduces leaks opportunities and
on the tool or the implements. This
makes assembly easy.
option also includes special joysticks
with modulated switches for medium
and high pressure modulation.

8
Serviceability
Simplified service and maintenance features save you time and money.

Extended Service Intervals.

312C service and maintenance intervals
have been extended to reduce machine
service time and increase machine
availability.
Radiator Compartment. The left rear
service door allows easy access to
the engine radiator and the oil cooler.
A reserve tank and drain cock are
attached to the radiator for simplified
maintenance.
Air Filter Compartment. The air filter
features a double-element construction
for superior cleaning efficiency.
Ground Level Service. The design
and layout of the 312C was made
with the service technician in mind.
Many service locations are easily
accessible at ground level allowing
critical maintenance to get done
quickly and efficiently.
Swing-Out Oil Cooler. The oil cooler
swings out horizontally for excellent
cleaning (optional equipment).
Pump Compartment. A service door
on the right side of the upper structure
allows ground-level access to the pump
Engine Inspection. Engine can be Electronic Power Unit Control.
and pilot filter.
accessed from the upper structure or Monitor Electronic Power Unit Control
Capsule Filter. The hydraulic return from under the machine. has diagnostic capabilities for service
filter, a capsule filter, is situated outside technicians use. Dealer service
Water Separator. Water separator
the hydraulic tank. This filter prevents technicians can quickly and easily
removes water from fuel even when
contaminants from entering the system diagnose and adjust machine
under pressure and is located in the
when hydraulic oil is changed and keeps component maximizing uptime.
battery compartment. Optional water
the operation clean. Filter change information available
level sensor within cab alarm.
in 20 different languages.
Anti-Skid “Punched-Star” Plate.
Handrails and Steps. Larger handrails
Anti-skid punched-star plate covers the Caterpillar Product Link system
and steps assist operator in climbing
top of storage box and upper structure attachment. It includes a transceiver
on and off machine.
to prevent slipping during maintenance. module (on-board the machine), office
The plate can be removed for cleaning. Grease-lubricated Track. Grease application PC software, and a satellite
lubricated seals protect the track link communications network to track
Radiator Compartment. The left rear
and deliver long track link pin and machine hours, location, and warnings.
service door allows easy access to the
bushing inner wear life. Product Link simplifies maintenance
engine radiator and the oil cooler.
scheduling, fleet management,
A reserve tank and drain cock are Fan Guard. Engine radiator fan is
unauthorized machine usage or
attached to the radiator for simplified completely enclosed by fine wire mesh,
movement, and product problem event
maintenance. reducing the risk of an accident.
tracking and diagnosis (PL-201).
Greasing Block. Remote greasing block Bearings. New boom and stick
on the boom and two grease points for standard bearings only need greasing
the swing bearing deliver grease to hard- every 1000 hours.
to-reach locations.

9
Undercarriage and Blade
Durable undercarriage absorbs stresses and provides excellent stability.

Robotic welding. Precision robotic Two undercarriage choices:*

welding helps ensure quality welds.
Standard undercarriage.
These welds increase rigidity, reduce
Standard undercarriage is well suited
Optional blade increases versatility. internal stresses and enhance durability
■ Helps level a working space so the
for applications that have restricted
for the chassis and track roller frames.
working space, or have uneven or rocky
312C sits firmly and digs vertically.
■ Dozes and backfills trenches.
Heavy-duty chassis design. Heavy- terrain.
duty, modified X-shaped chassis design.
Blade has a float position resulting Long undercarriage.
Cat undercarriage components are
in smooth levelling. Long undercarriage (L) maximizes
■ Speeds site cleanup - objects can be
purposely oversized to offer heavy-duty
stability and lifting capacity. Long and
performance and durability.
trapped against the blade for easier sturdy undercarriage offers a very stable
bucket loading. Track links. Strutted track links are work platform.
■ With the blade down, lifting capacity sealed for longer life. Track rollers,
Elimination of the ledge.
over the front is increased. carrier rollers and idlers are also sealed
The elimination of the ledge at carbody
and lubricated for excellent service life.
and roller frame juncture reduces
Two-speed travel motors. Smoother material build-up and makes digging
auto shifting two-speed travel motors out easier.
offer top travel speeds and plenty of
Idler guards. Standard idler guards
pull on slopes or turns.
maintain track alignment. Center
Grease-lubricated Tracks. Grease section guards are standard on 312C L
between pin and bushing, internal wear for additional protection on side slopes.
is reduced, contributing to extended * Custom product arrangements are available
undercarriage life. Consult your Caterpillar dealer for specifics.

10
Structures
The 312C structural components are the backbone of the machine’s durability.

1 Carbody design 2 Main frame

Advanced carbody design stands up Rugged main frame is designed for
in the toughest applications. maximum durability and efficient
■ Modified X-shaped, box-section use of materials.
carbody provides excellent ■ Outer frame utilizes curved side

resistance to torsional bending. rails, which are die-formed,

■ Upper structure weight and for excellent uniformity and
stresses are distributed evenly strength throughout the length.
across the full length of the track ■ Box section channels improve

roller frame. upper frame rigidity under

■ Smooth transitions and long the cab.
welds reduce stresses at the ■ Inverted U-channels span the

carbody-to-roller frame junctions width of the main frame and are

for excellent durability. formed, rather than fabricated,
■ Robotic welding ensures for superior strength and
consistent, high-quality welds reduced weight.
throughout the manufacturing ■ Boom tower and main rails are

process. constructed of solid, high-tensile

strength steel plates.
Track roller frame. Robotic welded ■ Boom foot and engine mount
track roller frame pentagonal box
areas reinforced for additional
section is press-formed to deliver
strength.
exceptional strength and service life.

11
Booms, Sticks, Buckets and Teeth
The 312C L has designed-in flexibility to help bring total solution for higher production and
efficiency to your jobs.

1 2

10 11 12 13 14 15 16 17 18 19 20

The right combination for the job. With full extension, the working range Pin-on version and Quick Couplers.
Select the right combination for the job gives both maximum dig depth and All Cat buckets are available in both
with your Cat dealer and you’ll help reach above ground. Equally, when the quick coupler and pin-on version.
ensure top production from the start. VA boom is retracted, it can work
1 Excavation Bucket. Digs and loads
closer to its tracks, increase lifting
Booms and sticks. Caterpillar excavator soft to medium materials such as clay
capacity and work in confined areas. All
booms and sticks are built for and earth. Features weld on tip
hydraulic adjustments to the VA boom
performance and long service life. adapters, hardened cutting edge and
angle can be made from the cab during
■ Large, welded, box-section structures side bars.
a work cycle for true versatility.
with thick, multi-plate fabrications in
2 Extreme Excavation Bucket. Digs and
high-stress areas. Single Offset boom. Single Offset boom
loads compact/abrasive materials like
■ Construction allows structures to flex for application requiring excavation
earth/rock, sand/clay, sand/gravel,
and dissipate stresses. work alongside the machine. It is ideal
coal, chalk and low abrasion ores.
for working under pipes, along walls
Two standard booms and three sticks. Features abrasion resistant steel for
and in other urban conditions where
The choice of two standard application all wear parts.
machine access is difficult.
booms and three sticks plus a wide
3 Ditch Cleaning Bucket. Wide, light
selection of buckets and attachments, Short stick. Short stick for mass
bucket used mainly with long reach
means the 312C offers several excavation and maximum breakout
configurations to clean waterbeds
combinations of reach and digging force bucket up to 0.75 m3.
and banks.
forces for optimum versatility.
Medium stick. Medium stick for
Tip selection
One-piece boom. One-piece boom for maximum versatility bucket up to 0.68 m3.
10 Penetration
all standard applications.
Long stick. Long stick for all standard 11 Penetration Long Life
Variable Angle Boom. A new variable applications bucket up to 0.61 m3. 12 Short
angle boom (VA) with a dramatically 13 Long
Linkage Bearings. New bearing
reduced weight, for vertical wall 14 Heavy Duty Long
technology has extended the front
digging, working near obstacles or in 15 Heavy Duty Abrasion
linkage greasing intervals for all
tight quarters. The variable geometry 16 Sharp / Corner Sharp
bearings, up to 1000 hours for the
boom offers superb flexibility and 17 Wide
boom and stick and up to 100 hours
versatility in the working envelop. 18 Twin Sharp
for the bucket.
19 Long Sharp
20 Penetration Plus

12
Tool Control System, Quick Couplers and Work-Tools
User-friendly, integrated electro-hydraulics make changing tools easy and quick and
allow the operator to focus on efficient work.

Tool Control. Five hydraulic pump flow and pressure settings

can be preset on the Multipro, eliminating the need to adjust
the hydraulics each time a tool is changed. Selecting the proper
setting from the Multipro’s menu instantly provides the operator
with the correct amount of flow and pressure for the tool.
The unique Cat proportional sliding switches provide
modulation to the tool and make precision work easy.
Quick Couplers. Caterpillar Quick Couplers enable the operator
to simply release one work tool and pick up another.
Your hydraulic excavator becomes highly versatile.
To suit your business and application needs, Caterpillar offers
two different types of Quick Couplers.
CW-Series Dedicated Quick Coupler. The dedicated CW-Series
quick coupler enables a quick tool exchange while maintaining
top machine performance. It is available in a hydraulic and
spindle version.
■ The hydraulic version is available in a standard

and a narrow version and makes it very easy

for the operator to switch tools
without having to leave the cab.
■ The spindle version is a user-friendly

mechanical version that can later be

easily converted into the hydraulic version
if required. The spindle version is also
available in the narrow and standard version.
■ A lifting hook is added to the dedicated Quick Coupler

for maximum lift capacity.

Pin Grabber Plus Quick Coupler. This hydraulically controlled
Pin Grabber Plus quick coupler makes changing buckets and
other popular work tools simple and fast. The Pin Grabber Plus
coupler mounts to the end of the stick and allows buckets,
clamshells and other work tools to be used with little or no
modification.
■ Each model fully adjusts to different pin
Multi-Processor. The Caterpillar Multi-Processors can be
spreads of various tools regardless of
equipped with different jaw types depending on your need.
manufacturer – it is the only coupler
that accommodates a wide range of Multi-Grapple. The Multi-Grapple with unlimited left and
work tool makes and models. right rotation is the ideal tool for stripping, sorting, handling
■ Pin-on assembly makes coupler and loading.
installation and removal fast and easy.
Orange Peel Grapple. Specifically designed for handling scrap
■ Coupler retains the same bucket opening and closing angles.
and rock in recycling and transfer applications.
■ Buckets can be reversed for greater flexibility when working

around and under obstructions. Hammer. The Cat hammers with a wide variety of tools
■ Integrated lift eye. provide the perfect match for maximal life, efficiency and
productivity.
A factory installed Quick Coupler hydraulic circuit avoids
difficult and costly retrofitting of Quick Coupler hydraulics
and allows usage of the most frequently used Quick Coupler
systems. Ask your Cat dealer for more specific information.

13
Engine Sound
Caterpillar 3064 T turbocharged diesel engine.
Operator Sound
Ratings at 1950 rpm kW hp Power rating conditions ■ The operator sound level measured
■ net power advertised is the power
Gross power 70 94 according to the procedures specified
Net power available at the flywheel when the in ISO 6396 is 74 dB(A), for cab
engine is equipped with fan, air offered by Caterpillar, when properly
ISO 9249 67 90
cleaner, muffler, and alternator installed and maintained and tested
EEC 80/1269 67 90 ■ no engine derating required below
with the doors and windows closed.
Dimensions 1500 m altitude Exterior Sound
■ Meets Stage II EU Emission
■ The labeled spectator sound power
Bore 102 mm
Directive 97/68/EC. level measured according to the test
Stroke 130 mm
procedures and conditions specified
Displacement 4.2 liters
in 2000/14/EC is 103 dB(A).

Steering Swing Mechanism

Two rocker pedals with detachable hand levers control steering and Hydrostatic with independent planetary
travel functions. reduction.

Controls Ratings
■ controls are pilot-operated for ■ moving one pedal or lever more Swing Torque 30.4 kNm
reduced efforts than the other, either forward or Swing Speed 12.0 rpm
■ left pedal and lever control left track; backward, results in a gradual turn
right pedal and lever control right track ■ moving one pedal or lever forward Features
■ the swing mechanism is driven by a
■ when idlers are in front, pushing both and the other pedal or lever
pedals or levers forward moves the backward counter-rotates the tracks pinion gear sealed in a grease bath
excavator straight ahead for spot turns through a double-reduction planetary
■ when the idlers are in front, rocking gear set
■ swing priority and fine control are
both pedals or pulling both levers
backward moves the excavator automatic
straight back

Brakes Undercarriage
Meets the following standard: Caterpillar designed and built track-type undercarriage.
ISO 10265:1998
312C 312C L blade 312C L
Service and parking brake features Short, Medium and Long sticks
■ wet, multiple-disc brakes are used on Track width* Ground Pressure
the final drive input shafts 500 mm triple grouser 45 kPa 47 kPa 45 kPa
■ spring-applied, hydraulically released
600 mm triple grouser 38 kPa 40 kPa 38 kPa
■ actuating a travel control
700 mm triple grouser 34 kPa 35 kPa 33 kPa
simultaneously releases the brakes
■ when the controls are released, the
770 mm triple grouser 31 kPa 32 kPa 30 kPa
brakes automatically apply * Custom product undercarriage are available.
Consult your Caterpillar dealer for specifics.

14 312C/312C L Hydraulic Excavator specifications

Drive Hydraulic System Implement Controls
Drive system is fully hydrostatic. Two variable displacement, axial-piston Two joystick hand levers actuate boom,
pumps power the boom, stick, swing, stick, bucket and swing.
Ratings bucket, auxiliary and travel circuits.
Maximum drawbar pull One single-section, gear-type pump Boom/Bucket Controls (right joystick)
powers the pilot circuit. ■ move forward and backward to lower
312C 108 kN
and raise boom
312C L 126 kN
Main Implement System ■ move left and right to control bucket
Maximum travel speed curl and dump
Maximum Flow (2x) 127 l/min
312C 5.5 km/h ■ button on top is one-touch low idle
Maximum pressure
312C L 5.1 km/h
Implements 29 900 kPa Stick/Swing Controls (left joystick)
Features Travel 34 300 kPa ■ move forward and backward to move

■ each track is driven by one stick out and in

Swing 23 050 kPa
independent, automatic shifting, two- ■ move left and right to control
Pilot System
speed axial piston motor via integral direction of swing
planetary final drives Maximum flow 23.7 l/min ■ button on top controls horn

■ each drive module is well integrated Maximum pressure 4120 kPa

Other Features
into the roller frame for total Blade System ■ oblique movement of either lever
protection Maximum flow 58.5 l/min
■ heavy-duty travel drive increase
operates two functions simultaneously
Maximum pressure 20 600 kPa ■ manually applied lever on left console
drawbar pull and provide a better
Boom Cylinder cuts off pilot pressure for joysticks
turnability.
Bore 110 mm and travel controls and electrical
Stroke 1015 mm power for engine starting circuit
Stick Cylinder Attachments
■ revolutionary joysticks with
Bore 120 mm
modulated switches are available
Cab/FOGS Stroke 1197 mm
with tool control option
Bolt-on Falling Object Guard System Bucket Cylinder
Allows a modulated actuation of
(FOGS) is available as an attachment. Bore 100 mm medium pressure on the left joystick
Stroke 939 mm and a hammer or any other tool on
Cab Certifications right joystick.
Optional Falling Object Guard System
is designed to protect the operator from
falling objects, and is certified under
ISO 3449-1984 specifications.

Service Refill Capacities Machine Weights

Machine is equipped with One-piece boom and 900 mm/0.54 m3 bucket.
Liters Weights will depend on final machine configuration.
Fuel Tank 250
Short stick Medium stick Long stick
Cooling System 17.5
312C kg kg kg
Engine Oil 17.5
500 mm triple grouser 12 720 12 790 12 868
Swing Drive 3
600 mm triple grouser 12 940 13 010 13 088
Final Drive (each) 2.5
700 mm triple grouser 13 170 13 240 13 318
Hydraulic system
(including tank) 164 770 mm triple grouser 13 324 13 394 13 472
Hydraulic tank 90 312C L
500 mm triple grouser 13 658 13 728 13 806
600 mm triple grouser 13 894 13 964 14 042
700 mm triple grouser 14 140 14 210 14 288
770 mm triple grouser 14 313 14 383 14 461
2780 mm Blade 850 850 850

312C/312C L Hydraulic Excavator specifications 15

Dimensions
All dimensions are approximate.

mm mm mm
A Shipping height (with bucket)* D Swing ground clearance 900 H Track gauge 1990
Short stick 2650 E Length to centers of rollers J Ground clearance 440
Medium stick 2655 312C 2780 K Cab height 2900
Long stick 2655 312C L 3040 L Overall width with
B Shipping length F Track length mirrors installed 2820
Short stick 7630 312C 3490 M Shipping width upper frame 2550
Medium stick 7595 312C L 3750 * may be limited by cab height (K)
Long stick 7610 G Shipping width
C Tail swing radius 2130 shoes of 500 mm 2490

Working Ranges
With One-piece boom

mm mm mm
Stick – Choice of three 2100 2500 3000
A Maximum digging depth 5155 5555 6055
B Maximum vertical wall digging depth 4629 5012 5520
C Maximum digging depth
at 2440 flat floor 4919 5347 5875
D Maximum reach at ground level 7814 8195 8644
E Maximum cutting height 8274 8529 8751
F Maximum loading height 5834 6083 6316
G Minimum loading height 2396 1997 1510
Digging forces:
Stick 71 kN 63 kN 57 kN
Bucket 84 kN 84 kN 84 kN
Bucket Tip Radius 1.22 m 1.22 m 1.22 m

16
Working Ranges
With Variable Adjustable Boom (VA)

mm mm mm
Stick – Choice of three 2100 2500 3000
A Maximum digging depth 4740 5130 5620
B Maximum vertical wall digging depth 2820 3210 3640
C Maximum digging depth
at 2440 mm flat floor 4610 5000 5500
D Maximum reach at ground level 7814 8220 8680
E Maximum cutting height 9170 9520 9910
F Maximum loading height 6910 7260 7650
G Minimum loading height 3185 2830 2540

Working Ranges
312C equipped with Offset Boom, 500 mm shoes and 900 mm width bucket (0.54 m3)

mm mm mm
Stick 2100 2500 3000
A Maximum digging depth 5355 5755 6260
B Maximum vertical wall digging depth 4160 4625 4980
C Maximum digging depth
at 2440 mm flat floor 5060 5490 6010
D Maximum reach at ground level 7940 8300 8720
E Maximum cutting height 8105 8310 8440
F Maximum loading height 5795 5986 6140
G Minimum loading height 2645 2250 1740
➤

2060 mm
➤➤

2100 mm
➤

0 1500 mm 3000 mm 4500 mm 6000 mm 7500 mm

17
Bucket Specifications
Contact your Caterpillar dealer for special bucket requirements.

Excavation Extreme Excavation

A Bite width mm 450 1000 1000 1100 1200 600 700 450 1000
B Tip radius mm 1220 1220 1220 1220 1220 1220 1220 1220 1220
Capacity m3 0.24 0.55 0.61 0.68 0.75 0.33 0.40 0.24 0.61
Weight kg 236 332 348 371 390 264 287 236 348
Number of teeth 3 5 5 6 6 3 4 3 5

Contact your Caterpillar dealer for

Ditch Cleaning
special buckets.
A Bite width mm 1800 2000
Capacity m3 0.63 0.83
Weight kg 450 530
➤ A ➤ ➤ B ➤

Recommended Maximum Material Density

Excavation Extreme Excavation

Bite width mm 450 1000 1000 1100 1200 600 700 450 600 1000
Weight kg 236 332 348 371 390 264 287 236 291 348
Capacity m3 0.24 0.55 0.61 0.68 0.75 0.33 0.40 0.24 0.33 0.61
Short stick kg/m3 1800 1800 1800 1800 1800 1800 1800 1800 1800 1800
Medium stick kg/m3 1800 1800 1800 1800 1800 1800 1800 1800 1800 1800
Long stick kg/m3 1800 1800 1800 1500 1500 1800 1800 1800 1800 1800
Configuration: 312C, 500 mm shoes

Material Densities Boom, Stick and

Bucket Compatibility
*kg/m3 *kg/m3
Clay, dry 1500 Gravel, pit run 1930 One-piece boom Bucket range
Clay, wet 1660 Rock/dirt, 50% 1720 Long stick 0.235 to 0.61 m3
Earth, dry 1510 Sand, dry 1425 Medium stick 0.235 to 0.68 m3
Earth, wet 1600 Sand, wet 1700 Short stick 0.235 to 0.75 m3
Loam 1250 Sand and Clay 1600 Variable Adjustable Boom (VA)
Gravel, dry 1510 Stone, crushed 1600 Long stick 0.235 to 0.61 m3
Gravel, wet 2000 Top soil 950 Medium stick 0.235 to 0.68 m3
* Kilograms per loose cubic meter Short stick 0.235 to 0.75 m3
For densities of other materials see Caterpillar Performance Handbook

18 312C/312C L Hydraulic Excavator specifications

Work Tools Matching Guide
When choosing between various work tool models that can be installed onto the same machine configuration, consider work tool application,
productivity requirements, and durability. Refer to work tool specifications for application recommendations and productivity information.

312C 312C L

500 mm shoes 600 mm shoes

Without quick coupler
mm 2100 2500 3000 2100 2500 3000
H90C
Hammers H100
H115 s
Rotary Cutters RC7
360° rotatable Shears S320*
G310B-D
Multi-Grapples
G310B-R
Compactors CVP75
5 tines GSH9-300
4 tines GSH9-300
5 tines GSH9-400
4 tines GSH9-400
5 tines GSH15-400 × ×
4 tines GSH15-400 ×
5 tines GSH15-500 × × ×
4 tines GSH15-500 × ×
5 tines GSH15-600 × × × ×
Orange Peel Grapples
4 tines GSH15-600 × × ×
5 tines GSH15-800 × × × × ×
4 tines GSH15-800 × × × ×
GSM22-250
GSM22-300
GSM22-400
GSM22-500
5 tines
GSM25-400 ×
GSM25-500 × ×
GSM25-600 × × ×
GSM25-800 × × × ×
GGS20
Clamshell Buckets Digging
GGS25 ×
GOS20-220
GOS20-260
GOS20-300
GOS20-400
GOS20-560
GOS20-680
GOS20-730
Clamshell Buckets Rehandling Maximum Material density
GOS25-460 3000 kg/m3
GOS25-520
GOS25-580
Maximum Material density
1800 kg/m3
GOS25-750 ×
GOS25-900 × × × Maximum Material density
GOS25-990 × × × 1200 kg/m3
GOS25-1140 × × × × × Not Compatible
With quick coupler
CW-20
Quick Coupler
CW-20s
H90C
Hammers H100
H115 s
Rotary Cutters RC7
G310B-D × × × × 360° Working Range
Multi-Grapples
G310B-R × × × × Over the front only
Compactors CVP75 Available
* Boom Mounted

312C/312C L Hydraulic Excavator specifications 19

Lift capacities with One-piece boom
All weights are in kg

312C 1.5 m 3.0 m 4.5 m 6.0 m 7.5 m

Short stick m
Shoes – 500 mm
6.0 m *3320 *3320 *2460 *2460 5.1
Quick coupler – 206 kg
4.5 m *3470 *3470 *2970 2140 *2250 2050 6.14
No Blade
3.0 m *5870 *5870 *4210 3300 2960 2090 *2240 1730 6.69
1.5 m *6780 5600 4480 3080 2870 2000 2310 1610 6.88
Ground *6360 5340 4300 2920 2790 1930 2360 1630 6.73
–1.5 m *4850 *4850 *6830 5330 4240 2870 2770 1910 2640 1820 6.22
–3.0 m *6420 *6420 *7470 5450 4300 2920 3450 2380 5.23

312C 1.5 m 3.0 m 4.5 m 6.0 m 7.5 m

Medium stick m
Shoes – 500 mm
6.0 m *1990 *1990 5.6
Quick coupler – 206 kg
4.5 m *3130 *3130 3070 2190 *1840 *1840 6.56
No Blade
3.0 m *5150 *5150 *3910 3380 3010 2130 *1830 1600 7.08
1.5 m *7780 5790 4550 3150 2900 2040 *1920 1490 7.26
Ground *6920 5430 4350 2970 2810 1950 *2140 1510 7.11
–1.5 m *4430 *4430 *6960 5360 4260 2890 2770 1910 2400 1660 6.63
–3.0 m *6330 *6330 *7780 5430 4280 2910 3010 2080 5.72

312C 1.5 m 3.0 m 4.5 m 6.0 m 7.5 m

Long stick m
Shoes – 500 mm
7.5 m *2060 *2060 4.65
Quick coupler – 206 kg
6.0 m *2140 *2140 *1730 *1730 6.17
No Blade
4.5 m *2760 2220 *1620 *1620 7.05
3.0 m *3430 3430 3020 2140 *1760 1430 *1620 1420 7.54
1.5 m *6880 5940 *4490 3170 2900 2030 2020 1400 *1700 1330 7.7
Ground *7710 5440 4340 2950 2790 1930 1980 1360 *1890 1340 7.57
–1.5 m *4070 *4070 *7320 5280 4220 2840 2730 1860 2120 1450 7.12
–3.0 m *6350 *6350 *7860 5300 4200 2820 2730 1870 2570 1760 6.28
–4.5 m *6600 5480 *4250 2930 *3730 2640 4.85

312C 1.5 m 3.0 m 4.5 m 6.0 m 7.5 m

Short stick m
Shoes – 600 mm
6.0 m *3320 *3320 *2460 *2460 5.1
Quick coupler – 206 kg
4.5 m *3470 *3470 *2970 2170 *2250 2080 6.14
No Blade
3.0 m *5870 *5870 *4210 3360 3020 2130 *2240 1760 6.69
1.5 m *6780 5690 4560 3130 2920 2040 2360 1640 6.88
Ground *6360 5430 4380 2970 2840 1960 2400 1660 6.73
–1.5 m *4850 *4850 *6830 5420 4320 2920 2820 1950 2690 1860 6.22
–3.0 m *6420 *6420 *7470 5540 4380 2970 3510 2420 5.23

312C 1.5 m 3.0 m 4.5 m 6.0 m 7.5 m

Medium stick m
Shoes – 600 mm
6.0 m *1990 *1990 5.6
Quick coupler – 206 kg
4.5 m *3130 *3130 3130 2230 *1840 *1840 6.56
No Blade
3.0 m *5150 *5150 *3910 3430 3060 2170 *1830 1630 7.08
1.5 m *7780 5880 4630 3200 2960 2070 *1920 1520 7.26
Ground *6920 5520 4430 3020 2870 1990 *2140 1540 7.11
–1.5 m *4430 *4430 *6960 5450 4340 2940 2820 1950 2450 1690 6.63
–3.0 m *6330 *6330 *7780 5520 4360 2960 3070 2120 5.72

20 312C/312C L Hydraulic Excavator specifications

312C 1.5 m 3.0 m 4.5 m 6.0 m 7.5 m
Long stick m
Shoes – 600 mm
7.5 m *2060 *2060 4.65
Quick coupler – 206 kg
6.0 m *2140 *2140 *1730 *1730 6.17
No Blade
4.5 m *2760 2250 *1620 *1620 7.05
3.0 m *3430 *3430 3070 2180 *1760 1460 *1620 1450 7.54
1.5 m *6880 6030 *4490 3220 2950 2060 2060 1420 *1700 1360 7.7
Ground *7710 5530 4420 3000 2840 1960 2020 1380 *1890 1360 7.57
–1.5 m *4070 *4070 *7320 5370 4290 2890 2780 1900 2160 1480 7.12
–3.0 m *6350 *6350 *7860 5400 4280 2870 2780 1910 2620 1790 6.28
–4.5 m *6600 5570 *4250 2980 *3730 2690 4.85

312C L 1.5 m 3.0 m 4.5 m 6.0 m 7.5 m

Short stick m
Shoes – 600 mm
6.0 m *3320 *3320 *2460 *2460 5.1
Quick coupler – 206 kg
4.5 m *3470 *3470 *2970 2200 *2250 2110 6.14
No Blade
3.0 m *5870 *5870 *4210 3390 3420 2150 *2240 1780 6.69
1.5 m *6780 5750 *5130 3170 3320 2060 *2360 1660 6.88
Ground *6360 5500 5050 3010 3240 1990 *2650 1680 6.73
–1.5 m *4850 *4850 *6830 5490 4990 2950 3220 1970 3070 1880 6.22
–3.0 m *6420 *6420 *7470 5600 5050 3000 4020 2450 5.23

312C L 1.5 m 3.0 m 4.5 m 6.0 m 7.5 m

Medium stick m
Shoes – 600 mm
6.0 m *1990 *1990 5.6
Quick coupler – 206 kg
4.5 m *3130 *3130 *3130 2260 *1840 *1840 6.56
No Blade
3.0 m *5150 *5150 *3910 3460 *3410 2190 *1830 1650 7.08
1.5 m *7780 5950 *4900 3230 3360 2100 *1920 1540 7.26
Ground *6920 5590 5100 3050 3270 2010 *2140 1560 7.11
–1.5 m *4430 *4430 *6960 5520 5010 2970 3220 1970 *2580 1720 6.63
–3.0 m *6330 *6330 *7780 5590 5030 2990 3500 2150 5.72

312C L 1.5 m 3.0 m 4.5 m 6.0 m 7.5 m

Long stick m
Shoes – 600 mm
7. 5 m *2060 *2060 4.65
Quick coupler – 206 kg
6.0 m *2140 *2140 *1730 *1730 6.17
No Blade
4.5 m *2760 2280 *1620 *1620 7.05
3.0 m *3430 *3430 *3090 2200 *1760 1480 *1620 1470 7.54
1.5 m *6880 6090 *4490 3260 3360 2090 2340 1440 *1700 1380 7.7
Ground *7710 5590 5100 3040 3250 1990 *2220 1400 *1890 1380 7.57
–1.5 m *4070 *4070 *7320 5430 4960 2920 3180 1930 *2250 1500 7.12
–3.0 m *6350 *6350 *7860 5460 4950 2910 3180 1930 2990 1820 6.28
–4.5 m *6600 5640 *4250 3020 *3730 2720 4.85

312C L 1.5 m 3.0 m 4.5 m 6.0 m 7.5 m

Short stick m
Shoes – 600 mm
6.0 m *3320 *3320 *2460 *2460 5.1
Quick coupler – 206 kg
4.5 m *3470 *3470 *2970 *2970 *2250 *2250 6.14
Blade down
3.0 m *5870 *5870 *4210 *4210 *3610 3180 *2240 *2240 6.69
1.5 m *6780 *6780 *5130 4790 *3970 3080 *2360 *2360 6.88
Ground *6360 *6360 *5750 4620 *4250 3000 *2650 2540 6.73
–1.5 m *4850 *4850 *6830 *6830 *5800 4560 *4150 2980 *3260 2840 6.22
–3.0 m *6420 *6420 *7470 *7470 *5050 4610 *4040 3700 5.23

312C/312C L Hydraulic Excavator specifications 21

Lift capacities with One-piece boom
All weights are in kg

312C L 1.5 m 3.0 m 4.5 m 6.0 m 7.5 m

Medium stick m
Shoes – 600 mm
6.0 m *1990 *1990 5.6
Quick coupler – 206 kg
4.5 m *3130 *3130 *3130 *3130 *1840 *1840 6.56
Blade down
3.0 m *5150 *5150 *3910 *3910 *3410 3220 *1830 *1830 7.08
1.5 m *7780 *7780 *4900 4860 *3840 3120 *1920 *1920 7.26
Ground *6920 *6920 *5650 4670 *4190 3030 *2140 *2140 7.11
–1.5 m *4430 *4430 *6960 *6960 *5870 4580 *4250 2980 *2580 *2580 6.63
–3.0 m *6330 *6330 *7780 *7780 *5380 4600 *3580 3240 5.72

312C L 1.5 m 3.0 m 4.5 m 6.0 m 7.5 m

Long stick m
Shoes – 600 mm
7.5 m *2060 *2060 4.65
Quick coupler – 206 kg
6.0 m *2140 *2140 *1730 *1730 6.17
Blade down
4.5 m *2760 *2760 *1620 *1620 7.05
3.0 m *3430 *3430 *3090 *3090 *1760 *1760 *1620 *1620 7.54
1.5 m *6880 *6880 *4490 *4490 *3570 3110 *2460 2180 *1700 *1700 7.7
Ground *7710 *7710 *5380 4660 *4010 3000 *2220 2140 *1890 *1890 7.57
–1.5 m *4070 *4070 *7320 *7320 *5790 4530 *4220 2940 *2250 *2250 7.12
–3.0 m *6350 *6350 *7860 *7860 *5570 4520 *3910 2940 *2990 2770 6.28
–4.5 m *6600 *6600 *4250 *4250 *3730 *3730 4.85

312C L 1.5 m 3.0 m 4.5 m 6.0 m 7.5 m

Short stick m
Shoes – 600 mm
6.0 m *3320 *3320 *2460 *2460 5.1
Quick coupler – 206 kg
4.5 m *3470 *3470 *2970 2330 *2250 2230 6.14
Blade up
3.0 m *5870 *5870 *4210 3580 3430 2280 *2240 1890 6.69
1.5 m *6780 6080 *5130 3350 3330 2190 *2360 1770 6.88
Ground *6360 5830 5060 3190 3250 2120 *2650 1790 6.73
–1.5 m *4850 *4850 *6830 5820 5000 3140 3230 2100 3070 2000 6.22
–3.0 m *6420 *6420 *7470 5930 *5050 3190 4020 2600 5.23

312C L 1.5 m 3.0 m 4.5 m 6.0 m 7.5 m

Medium stick m
Shoes – 600 mm
6.0 m *1990 *1990 5.6
Quick coupler – 206 kg
4.5 m *3130 *3130 *3130 2380 *1840 *1840 6.56
Blade up
3.0 m *5150 *5150 *3910 3650 *3410 2320 *1830 1750 7.08
1.5 m *7780 6270 *4900 3420 3370 2220 *1920 1650 7.26
Ground *6920 5920 5110 3240 3270 2140 *2140 1660 7.11
–1.5 m *4430 *4430 *6960 5850 5020 3160 3230 2100 *2580 1830 6.63
–3.0 m *6330 *6330 *7780 5920 5040 3180 3510 2280 5.72

312C L 1.5 m 3.0 m 4.5 m 6.0 m 7.5 m

Long stick m
Shoes – 600 mm
7.5 m *2060 *2060 4.65
Quick coupler – 206 kg
6.0 m *2140 *2140 *1730 *1730 6.17
Blade up
4.5 m *2760 2410 *1620 *1620 7.05
3.0 m *3430 *3430 *3090 2330 *1760 1580 *1620 1570 7.54
1.5 m *6880 6420 *4490 3440 3370 2220 2350 1540 *1700 1470 7.7
Ground *7710 5920 5100 3230 3250 2120 *2220 1500 *1890 1480 7.57
–1.5 m *4070 *4070 *7320 5760 4970 3110 3180 2050 *2250 1610 7.12
–3.0 m *6350 *6350 *7860 5790 4950 3100 3190 2060 2990 1940 6.28
–4.5 m *6600 5960 *4250 3200 *3730 2890 4.85

22 312C/312C L Hydraulic Excavator specifications

312C L 1.5 m 3.0 m 4.5 m 6.0 m 7.5 m
Short stick m
Shoes – 700 mm
6.0 m *3320 *3320 *2460 *2460 5.1
Quick coupler – 206 kg
4.5 m *3470 *3470 *2970 *2970 *2250 *2250 6.14
Blade down
3.0 m *5870 *5870 *4210 *4210 *3610 3230 *2240 *2240 6.69
1.5 m *6780 *6780 *5130 4870 *3970 3140 *2360 *2360 6.88
Ground *6360 *6360 *5750 4700 *4250 3060 *2650 2590 6.73
–1.5 m *4850 *4850 *6830 *6830 *5800 4640 *4150 3040 *3260 2890 6.22
–3.0 m *6420 *6420 *7470 *7470 *5050 4700 *4040 3770 5.23

312C L 1.5 m 3.0 m 4.5 m 6.0 m 7.5 m

Medium stick m
Shoes – 700 mm
6.0 m *1990 *1990 5.6
Quick coupler – 206 kg
4.5 m *3130 *3130 *3130 *3130 *1840 *1840 6.56
Blade down
3.0 m *5150 *5150 *3910 *3910 *3410 3270 *1830 *1830 7.08
1.5 m *7780 *7780 *4900 *4900 *3840 3170 *1920 *1920 7.26
Ground *6920 *6920 *5650 4750 *4190 3080 *2140 *2140 7.11
–1.5 m *4430 *4430 *6960 *6960 *5870 4660 *4250 3040 *2580 *2580 6.63
–3.0 m *6330 *6330 *7780 *7780 *5380 4680 *3580 3300 5.72

312C L 1.5 m 3.0 m 4.5 m 6.0 m 7.5 m

Long stick m
Shoes – 700 mm
7.5 m *2060 *2060 4.65
Quick coupler – 206 kg
6.0 m *2140 *2140 *1730 *1730 6.17
Blade down
4.5 m *2760 *2760 *1620 *1620 7.05
3.0 m *3430 *3430 *3090 *3090 *1760 *1760 *1620 *1620 7.54
1.5 m *6880 *6880 *4490 *4490 *3570 3170 *2460 2220 *1700 *1700 7.7
Ground *7710 *7710 *5380 4740 *4010 3060 *2220 2180 *1890 *1890 7.57
–1.5 m *4070 *4070 *7320 *7320 *5790 4610 *4220 2990 *2250 *2250 7.12
–3.0 m *6350 *6350 *7860 *7860 *5570 4600 *3910 3000 *2990 2820 6.28
–4.5 m *6600 *6600 *4250 *4250 *3730 *3730 4.85

312C L 1.5 m 3.0 m 4.5 m 6.0 m 7.5 m

Short stick m
Shoes – 700 mm
6.0 m *3320 *3320 *2460 *2460 5.1
Quick coupler – 206 kg
4.5 m *3470 *3470 *2970 2370 *2250 *2250 6.14
Blade up
3.0 m *5870 *5870 *4210 3630 3490 2320 *2240 1930 6.69
1.5 m *6780 6180 *5130 3410 3400 2230 *2360 1800 6.88
Ground *6360 5930 5160 3250 3320 2160 *2650 1830 6.73
–1.5 m *4850 *4850 *6830 5920 5090 3190 3290 2140 3130 2040 6.22
–3.0 m *6420 *6420 *7470 6030 *5050 3250 *4040 2650 5.23

312C L 1.5 m 3.0 m 4.5 m 6.0 m 7.5 m

Medium stick m
Shoes – 700 mm
6.0 m *1990 *1990 5.6
Quick coupler – 206 kg
4.5 m *3130 *3130 *3130 2420 *1840 *1840 6.56
Blade up
3.0 m *5150 *5150 *3910 3710 *3410 2360 *1830 1790 7.08
1.5 m *7780 6380 *4900 3470 3430 2260 *1920 1680 7.26
Ground *6920 6020 5210 3300 3340 2180 *2140 1700 7.11
–1.5 m *4430 *4430 *6960 5950 5120 3220 3300 2140 *2580 1870 6.63
–3.0 m *6330 *6330 *7780 6020 5140 3230 3580 2330 5.72

312C L 1.5 m 3.0 m 4.5 m 6.0 m 7.5 m

Long stick m
Shoes – 700 mm
7.5 m *2060 *2060 4.65
Quick coupler – 206 kg
6.0 m *2140 *2140 *1730 *1730 6.17
Blade up
4.5 m *2760 2450 *1620 *1620 7.05
3.0 m *3430 *3430 *3090 2370 *1760 1610 *1620 1600 7.54
1.5 m *6880 6520 *4490 3500 3430 2260 2400 1570 *1700 1500 7.7
Ground *7710 6020 5200 3280 3320 2160 *2220 1530 *1890 1510 7.57
–1.5 m *4070 *4070 *7320 5860 5070 3170 3250 2090 *2250 1640 7.12
–3.0 m *6350 *6350 *7860 5890 5050 3150 3260 2100 *2990 1980 6.28
–4.5 m *6600 6070 *4250 3260 *3730 2940 4.85
Lift capacities with Variable Adjustable boom
All weights are in kg

312C 0m 1.5 m 3.0 m 4.6 m 6.0 m 7.5 m

Short stick m
Shoes
7. 5 m *3720 *3720 *2980 *2980 3.36
500 mm
6.0 m *4150 *4150 *3790 3620 *2230 *2230 5.27
Quick coupler
4.5 m *5080 *5080 *4800 3690 3060 2160 *2010 1960 6.28
206 kg 3.0 m *7840 6570 4880 3630 3060 2150 *1980 1650 6.83
1.5 m *6580 *6580 *8430 *6430 4810 3430 2980 2080 *2060 1540 7.01
Ground *6430 *6430 *8740 5930 4650 3190 2870 1970 *2280 1560 6.86
–1.5 m *7060 *7060 *6580 *6580 8960 5640 4470 3030 2790 1900 2560 1740 6.36
–3.0 m *7770 *7770 *8010 5630 *4250 2940

312C 0m 1.5 m 3.0 m 4.6 m 6.0 m 7.5 m

Medium stick m
Shoes
7. 5 m *3550 *3550 *2260 *2260 4.11
500 mm
6.0 m *3740 3690 *1790 *1790 5.77
Quick coupler
4.5 m *3930 *3930 *4190 3720 3140 2250 *1630 *1630 6.71
206 kg 3.0 m *7340 6670 4910 3660 3130 2230 *1610 1530 7.22
1.5 m *8640 *8640 *8660 6490 4830 3520 3050 2150 *1670 1430 7.39
Ground *5680 *5680 *6420 *6420 *8660 6080 4730 3260 2920 2030 *1840 1440 7.25
–1.5 m *6600 *6600 *6580 *6580 9050 5720 4530 3080 2820 1930 *2170 1590 6.78
–3.0 m *6370 *6370 *7150 *7150 *8680 5640 4390 2960

312C 0m 1.5 m 3.0 m 4.6 m 6.0 m 7.5 m

Long stick m
Shoes
7. 5 m *2670 *2670 *1890 *1890 4.89
500 mm
6.0 m *3190 *3190 *2400 2250 *1570 *1570 6.34
Quick coupler
4.5 m *3440 *3440 3170 2310 *1460 *1460 7.2
206 kg 3.0 m *4800 *4800 *4540 3650 3160 2290 2080 1430 *1450 1360 7.68
1.5 m *10560 *10560 *8450 6450 4790 3560 3090 2200 2040 1400 *1510 1270 7.84
Ground *4320 *4320 *7020 *7020 *8680 6220 4770 3300 2960 2060 1990 1340 *1650 1270 7.71
–1.5 m *6010 *6010 *6810 *6810 8910 5730 4530 3070 2820 1920 *1930 1380 7.27
–3.0 m *6330 *6330 *7460 *7460 8880 5560 4370 2930 2760 1860 *2160 1680 6.45
–4.5 m *9300 *9300 *5950 5570

312C 0m 1.5 m 3.0 m 4.6 m 6.0 m 7.5 m

Short stick m
Shoes
7. 5 m *3720 *3720 *2980 *2980 3.36
600 mm
6.0 m *4150 *4150 *3790 3680 *2230 *2230 5.27
Quick coupler
4.5 m *5080 *5080 *4800 3740 3110 2190 *2010 1990 6.28
206 kg 3.0 m *7840 6670 4940 3680 3100 2190 *1980 1680 6.83
1.5 m *6580 *6580 *8430 6500 4860 3480 3030 2120 *2060 1570 7.01
Ground *6430 *6430 *8740 6020 4730 3240 2920 2010 *2280 1590 6.86
–1.5 m *7060 *7060 *6580 *6580 9110 5730 4550 3080 2850 1940 2610 1780 6.36
–3.0 m *7770 *7770 *8010 5720 *4250 2990

312C 0m 1.5 m 3.0 m 4.6 m 6.0 m 7.5 m

Medium stick m
Shoes
7. 5 m *3550 *3550 *2260 *2260 4.11
600 mm
6.0 m *3740 *3740 *1790 *1790 5.77
Quick coupler
4.5 m *3930 *3930 *4190 3770 3190 2280 *1630 *1630 6.71
206 kg 3.0 m *7340 *6760 4970 3690 3180 2270 *1610 1560 7.22
1.5 m *8640 *8640 *8660 *6530 4880 3570 3090 2180 *1670 1460 7.39
Ground *5680 *5680 *6420 *6420 *8660 6170 4800 3310 2980 2070 *1840 1470 7.25
–1.5 m *6600 *6600 *6580 *6580 *9130 5810 4600 3130 2870 1960 *2170 1620 6.78
–3.0 m *6370 *6370 *7150 *7150 *8680 5730 4470 3010

24 312C/312C L Hydraulic Excavator specifications

312C 0m 1.5 m 3.0 m 4.6 m 6.0 m 7.5 m
Long stick m
Shoes
7. 5 m *2670 *2670 *1890 *1890 4.89
600 mm
6.0 m *3190 *3190 *2400 2280 *1570 *1570 6.34
Quick coupler
4.5 m *3440 *3440 3210 2340 *1460 *1460 7.2
206 kg 3.0 m *4800 *4800 *4540 3680 3220 2320 2120 1460 *1450 1380 7.68
1.5 m *10560 *10560 *8450 6540 4850 3610 3140 2230 2080 1430 *1510 1290 7.84
Ground *4320 *4320 *7020 *7020 *8680 6310 4820 3350 3010 2100 2030 1370 *1650 1300 7.71
–1.5 m *6010 *6010 *6810 *6810 *8980 5820 4600 3120 2870 1960 *1930 1410 7.27
–3.0 m *6330 *6330 *7460 *7460 *8980 5650 4450 2980 2810 1900 *2160 1710 6.45
–4.5 m *9300 *9300 *5950 5660

312C L 0m 1.5 m 3.0 m 4.6 m 6.0 m 7.5 m

Short stick m
Shoes
7. 5 m *3720 *3720 *2980 *2980 3.36
600 mm
6.0 m *4150 *4150 *3790 3710 *2230 *2230 5.27
Quick coupler
4.5 m *5080 *5080 *4800 *3770 *3410 2220 *2010 2010 6.28
206 kg 3.0 m *7840 6730 *5310 3710 3520 2210 *1980 1700 6.83
1.5 m *6580 *6580 *8430 6560 5400 3520 3440 2140 *2060 1590 7.01
Ground *6430 *6430 *8740 6080 5430 3280 3330 2030 *2280 1610 6.86
–1.5 m *7060 *7060 *6580 *6580 *9150 5800 5240 3120 3260 1960 *2730 1800 6.36
–3.0 m *7770 *7770 *8010 5780 *4250 3030

312C L 0m 1.5 m 3.0 m 4.6 m 6.0 m 7.5 m

Medium stick m
Shoes
7. 5 m *3550 *3550 *2260 *2260 4.11
600 mm
6.0 m *3740 *3740 *1790 *1790 5.77
Quick coupler
4.5 m *3930 *3930 *4190 3800 *3530 *2310 *1630 *1630 6.71
206 kg 3.0 m *7340 6780 *5120 3720 3580 2290 *1610 1580 7.22
1.5 m *8640 *8640 *8660 6580 5430 3610 3500 2210 *1670 1480 7.39
Ground *5680 *5680 *6420 *6420 *8660 6240 *5420 3350 3390 2090 *1840 1490 7.25
–1.5 m *6600 *6600 *6580 *6580 *9130 5870 5300 3170 3290 1990 *2170 1640 6.78
–3.0 m *6370 *6370 *7150 *7150 *8680 5800 *5100 3050

312C L 0m 1.5 m 3.0 m 4.6 m 6.0 m 7.5 m

Long stick m
Shoes
7. 5 m *2670 *2670 *1890 *1890 4.89
600 mm
6.0 m *3190 *3190 *2400 2310 *1570 *1570 6.34
Quick coupler
4.5 m *3440 *3440 *3240 2370 *1460 *1460 7.2
206 kg 3.0 m *4800 *4800 *4540 3720 3590 2350 *2120 1480 *1450 1400 7.68
1.5 m *10560 *10560 *8450 *6560 5410 3650 3540 2250 2370 1450 *1510 1310 7.84
Ground *4320 *4320 *7020 *7020 *8680 6370 5340 3390 3420 2120 2310 1390 *1650 1320 7.71
–1.5 m *6010 *6010 *6810 *6810 *8980 5890 5300 3160 3280 1980 *1930 1430 7.27
–3.0 m *6330 *6330 *7460 *7460 *8980 5720 5140 3020 *3160 1920 *2160 1730 6.45
–4.5 m *9300 *9300 *5950 5720

Load Point Height Load Radius Over Front Load Radius Over Side Load at Maximum Reach
* Limited by hydraulic rather than tipping load.
The above loads are in compliance with hydraulic excavator lift capacity ratings standard ISO 10567, they do not exceed 87% of hydraulic lifting capacity
or 75% of tipping capacity. Weight of all lifting accessories must be deducted from the above lifting capacities.

312C/312C L Hydraulic Excavator specifications 25

Standard Equipment
Standard and optional equipment may vary. Consult your Caterpillar dealer for specifics.

Electrical Dial-type throttle Other standard equipment

55-amp alternator Highly efficient ventilation system: Hydraulic cross sensing system
Light: heater and defroster Auxiliary hydraulic valve
boom, left side positive filtered ventilation Boom regeneration circuit
frame, right side Radio mounting (DIN) with wiring, Stick regeneration circuit
Warning horn antenna and provision for two stereo Reverse swing damping valve
Two 100-amp batteries speakers Automatic boom and swing priority
Ashtray with light Automatic swing brake
Guards
Drink holder Hydraulic cylinder snubbers
Bottom guard
Coat hook Caterpillar XT hoses
Track motor guard
Open storage for lunch and newspaper O-ring face seal couplings
Operator environment holder Hydraulic oil cooler
Cab, sound and vibration suppressed Interior lighting Electronic Power Unit Control with
with floor mat and double wall Literature compartment internal diagnostic capabilities
cab shell Wiring provision for electrical seat Capability of stackable valves for
Integrated joystick consoles, suspended heating and beacon light main valve
as part of seat arrangement 12V/7A power supply Separate no-oil-drip hydraulic
High contrast liquid crystal monitor Front horn capsule filter avoiding spills
with language display, including and contamination
Powertrain
warning and filter change information Caterpillar Radial Seal Air Filter
Cat 3064 T diesel engine with:
tool setting and diagnostic capability Scheduled Oil Sampling port
Low Emission, Low Noise version
Start up level check for hydraulic oil, Remote greasing block
24 volt electric starting and flame
engine oil and engine coolant (boom, swing bearing)
heater aid
Fully adjustable suspension seat with: Extended life coolant (-36˚C)
Automatic engine speed control
ergonomic design Rearview mirrors; frame-right and
Water separator in fuel line
adjustable armrest cab-left
Two speed travel with automatic
four way adjustable (up-down, Counterweight (2450 kg)
shift change
front-rear) and tiltable seat Machine lifting point plate on
Straight line travel
seat and console move as a single unit counterweight
Variable displacement, negative flow
weight adjustments and retractable Door and cap locks plus Caterpillar
control hydraulic system
seatbelt one-key security system
Windows: Undercarriage
Self lubricating bearing
openable front windshield upper Grease-lubricated tracks with:
Oil less bearing technology has
and lower with assistance device 600 mm triple grouser shoes
extended the front linkage greasing
sliding door window on 312C L
intervals for all bearings
polycarbonate skylight 500 mm triple grouser shoes
right and rear window on 312C
Synchronized lower and upper Hydraulic track adjuster
parallelogram wiper and washer Idler-end track guiding guards
Neutral lever lock out for all controls Step group
Travel control pedals with removable Center track guiding guard
hand levers (312C L only)
Platform with provision for two
attachment control pedals

26 312C/312C L Hydraulic Excavator specifications

Optional Equipment

Backhoe Operator environment Hydraulics

Boom: Air conditioner, with automatic High pressure auxiliary hydraulic
one-piece, with light, left side: 4.65 m climate control arrangements:
hydraulically adjustable (VA), Sun protective visor, windshield single function arrangement
with light, left side Rain protective visor, windshield hydraulic combined function
Single Offset Boom Radio AM/FM, Tape arrangement (inclusive of two
Stick: Optional fully adjustable suspension pump flow)
3000 mm seat with: two pump flow arrangement
2500 mm headrest electronic combined function
2100 mm higher back seat arrangement (tool control)
Boom lowering check valve tiltable integrated consoles High pressure auxiliary hydraulic lines
Stick lowering check valve Seat heater with headrest for boom and stick
VA Boom and offset boom check valves Lunch box cover Medium pressure hydraulic
Bucket linkage 12V-7A power supply arrangement
Buckets and tips Medium pressure hydraulic lines for
Undercarriage
Quick coupler boom and stick
Grease-lubricated Track with:
Quick coupler hydraulic arrangement
Electrical 500 mm triple grouser
Quick coupler hydraulic lines for
Light: 600 mm triple grouser
boom and stick
working, cab mounted (two) 700 mm triple grouser
Clamshell actuator
falling objects guard (two) 770 mm triple grouser
Bio oil filling ex-factory
boom, right side 850 mm triple grouser
Travel alarm 900 mm LGP (custom product)* Cooling package
Cab working lights 1400 mm LGP (custom product)* Swing-Out Oil Cooler
Sealed and lubricated tracks with: High ambient cooling (52˚C)
Guards
700 mm triple grouser
Swivel guard Other attachments
Special arrangement High/Wide 2080 mm
Falling objects guard (FOGS) Electric refueling pump
(custom product)*
Bottom guard, heavy duty Water fuel separator with electrical
Special arrangement LGP 2420 mm
sensor for alarm
(custom product)*
Product link (satellite transmission of
Rubber pads: 500 mm and 600 mm
machine data)
(custom product)*
High ambient cooling system
Blade:
2490 mm for 500 mm * Consult your Caterpillar dealer for custom
triple grouser shoes product arrangements.
2625 mm for 600 mm
triple grouser shoes
2780 mm for 700 and 770 mm
triple grouser shoes
Center track guiding guard
Front and rear track guiding guard
Full length track guiding guard

312C/312C L Hydraulic Excavator specifications 27

312C and 312C L Hydraulic Excavators

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Materials and specifications are subject to change without notice.
Featured machines in photos may include additional equipment. © 2004 Caterpillar
HEHH5414-2 (06/2004) hr See your Caterpillar dealer for available options. All rights reserved