311C Utility Hydraulic Excavator

Increased horsepower, better controllability, extended service intervals and a redesigned operator station increase your productivity and lower your operating costs.

Engine



The four cylinder turbocharged Cat 3064 T engine is built for power, reliability, economy and low emissions.

Torque Rise



The engine is designed for high torque rise at middle rpm, a feature that is especially beneficial for heavyduty use.

Cylinder Block



The cylinder block is cast iron for improved wear resistance. The upper part is laser hardened to reduce oil consumption and internal component wear.

Maintenance



The oil level gauge, oil filter, fuel filter and priming pump are located on the right side of the upper structure for easy maintenance. The engine oil filter and fuel filter change intervals have been extended.

Crankshaft



The eight balance, onepiece, forged crankshaft enhances balance and decreases vibration and is induction hardened to improve abrasion resistance.

Pistons



Heat resistant aluminum alloy pistons have a short compression height, reducing weight and improving efficiency.

Fuel Consumption



The 3064 T engine has the best fuel consumption in this class of diesel engines. It features improved thermal efficiency and reduced friction resistance between piston and liners.

Air Intake Heating



Air intake heating is standard on the 311C U for easier cold starts.

Hydraulics



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

Component Layout



The 311C U hydraulic system was designed to provide a high level of efficiency. With all major components located close together, shorter tubes and lines are needed, resulting in less friction loss in the lines and reduced pressure drops.

Hydraulic Cross Sensing System



Improves productivity with faster implement speeds and quicker, stronger pivot turns.

Automatic Boom and Swing Priority



For simpler operation, work mode and power mode switches have been eliminated. Instead, the automatic boom and swing priority function selects the best mode, based on joystick movement.

Stackable Valves



Up to two additional control valves can be added to the main control valve of the 311C U to run additional tools.

Controllability



The hydraulic system offers precise control to the 311C U, reducing operator fatigue, improving operator effectiveness and efficiency, which ultimately translates into enhanced performance.

Auxiliary Hydraulic Valve



For further versatility, a dedicated hammer single function, thumb double function, and combined auxiliary hydraulics are offered on the 311C U.

Hydraulic Snubbers



Hydraulic cylinder snubbers at the rodend of boom cylinders and both ends of the stick cylinders cushion shocks, reduce sound and increase cylinder life.

Undercarriage and Structures



Durable undercarriage absorbs stresses and provides excellent stability.

Structures



The 311C U structural components and undercarriage are the backbone of the machines durability.

Carbody Design and Track Roller Frames



Xshaped, boxsection carbody provides excellent resistance to torsional bending. Robotwelded track roller frames are pressformed, pentagonal units to deliver exceptional strength and service life.

Rollers and Idlers



Sealed and lubricated track rollers, carrier rollers and idlers provide excellent service life, to keep the machine in the field longer.

Main Frame



The rugged main frame is designed for maximum durability and efficient use of materials.

Grease Lubricated Track



New grease lubricated seals protect the track link and deliver long track link pin and bushing inner wear life.

Travel Motors



Automatic speed selection enables the machine to automatically change up and down from high and low speeds in a smooth, controlled manner.

Idler Guard



An idler guard, which is integral to the track roller frame, is standard. This guard helps maintain track alignment while traveling or working on slopes.

Blades



For further versatility and to meet more general purposes needs, three blade width options are available on the 311C U.

Shorter Tail Swing Radius



The 311C U, with its reduced tail swing radius, is easier to operate while against walls and in tight areas, reducing the concern of the rear of the machine during operation. The shorter tail measurement allows flexibility for ideal use in urban construction, logging roads, and other space restricted sites.

Front Linkage



Designedin flexibility to help bring higher production and efficiency to all jobs.

Front Linkage



Front linkage variations on the 311C U allow for the use of one boom, two sticks and five buckets. Using these combinations improves the generalpurpose versatility of the 311C U by suiting it to a diverse range of applications.

Boom



The boom on the 311C U is designed to provide maximum digging capability. Caterpillar booms are manufactured with hightensile steel for upper, lower and side plates and robot welded for consistent quality.

Stick



Two sticks are available on the 311C U. The customers working envelope and bucket capacity needs determine their stick choice.

Boom and Stick Construction



Built for performance and long service life, Caterpillar booms and sticks are large, welded, boxsection structures with thick, multiplate fabrications in highstress areas.

Buckets



High tensile strength steel is used in highstress areas for excellent wear and shock resistance. The excavation bucket is designed for generalpurpose excavation and to have a large bucket capacity and tip radius.

Bucket Linkage



The bucket linkage on the 311C U includes the bucket cylinder, idler link and power links.

Linkage Bearings



New bearing technology has extended the front linkage greasing intervals for all bearings.

Operator Station



Designed for simple operation, the 311C U operator station allows the operator to focus on production.

Operator Environment



The 311C U operator work station is quiet with ergonomic control placement and convenient adjustments, low lever and pedal effort, ergonomic seat design and highly efficient ventilation.

Monitor



The 311C Us newly designed and conveniently located monitor allows the operator to monitor machine performance while sitting in a comfortable position.

Automatic Boom and Swing Priority Function



For simpler operation, work mode and power mode switches have been eliminated. Instead, the automatic boom and swing priority function selects the best mode, based on joystick movement.

Redesigned Layout



Redesigned cab layout emphasizes simplicity and ease of use. Righthand wall and console provide easy access to all switches, dials and controls.

Travel Controls



A large rubbercovered footrest at the side of the travel pedals allows the foot to easily grip the pedal. The travel lever stroke and force have been enhanced to improve the 311C Us fine controllability, making the machine easier to operate.

Seat



A new seat with a twotone color offers two types of cushions soft and firm for operator comfort. The reclining knob is located at the rightside of the seat for easier reclining adjustment.

Automatic Climate Control



Fully automatic climate control adjusts temperature and flow and determines which air outlet is best in each situation.

Skylight



A large polycarbonate skylight delivers excellent natural lighting and good ventilation. Standard sliding sunshade protects from direct sunlight.

Cab Exterior



The 311C Us cab is newly designed using asymmetrical steel tubing for improved resistance to fatigue and vibration. Falling Object Guard System 40FOGS41 may be boltedon directly to the cab.

Cab Mounts



The cab shell is attached to the frame with improved viscous mounts, reducing vibration and sound.

Wiper



With continuous and intermittent modes, the wiper is positioned on the right cab pillar to further improve the operators viewing area.

Clear View Over the Engine



The engine hood has been lowered, improving the operators rear viewing area.

Hydraulic Actuation Control Lever



For easy access, a larger hydraulic actuation control lever is attached to the cab floor.

Upper Front Windshield



The upper front windshield opens, closes and stores on the roof above the operator.

Lower Front Windshield



The lower front windshield glass features a rounded design that maximizes downward viewing.

Serviceability



Simplified service and maintenance features save you time and money.

Extended Service Intervals



311C U 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 doubleelement construction for superior cleaning efficiency. When the air cleaner plugs, a red warning sign appears on the indicator near the air cleaner.

Ground Level Service



The design and layout of the 311C U 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.

Pump Compartment



A service door on the right side of the upper structure allows groundlevel access to the pump and pilot filter.

Capsule Filter



The hydraulic return filter, a capsule filter, is situated outside the hydraulic tank. This filter prevents contaminants from entering the system when hydraulic oil is changed and keeps the operation clean.

AntiSkid PunchedStar Plate



Antiskid punchedstar plate covers the maintenance walkway to prevent slipping. The plate can be removed for cleaning.

Engine Inspection



The engine can be accessed from the upper structure or from under the machine. The engine and pump compartment are separated by a steel wall.

Handrails and Steps



Larger handrails and steps assist the operator in climbing on and off the machine.

Grease Lubricated Track



Grease lubricated seals protect the track link and deliver long track link pin and bushing inner wear life.

Fan Guard



The engine radiator fan is completely enclosed by fine wire mesh, reducing the risk of an accident.

Complete Customer Support



Cat dealer services help you operate longer with lower costs.

Selection



Make detailed comparisons of the machines you are considering before you buy. What are the job requirements What production is needed What is the true cost of lost production Your Cat dealer can give you precise answers to these questions.

Purchase



Look past initial price, look at the value the 311C U offers. Consider the financing options available as well as daytoday operating costs.

Operation



Improving operating techniques can boost your profits. Your Cat dealer has training literature and other ideas to help you increase productivity.

Maintenance



Repair option programs guarantee the cost of repairs up front. Diagnostic programs such as Scheduled Oil Sampling and Technical Analysis help you avoid unscheduled repairs.

Replacement



Repair, rebuild or replace Your Cat dealer can help you evaluate the cost involved so you can make the right choice.

Product Support



You will find nearly all parts at our dealer parts counter. Cat dealers utilize a worldwide computer network to find instock parts to minimize machine down time. You will save money with remanufactured components.


Engine
Engine Model
Cat® 3064T
Flywheel Power
79 hp
Gross Power
82 hp
ISO 9249
79 hp
SAE J1349
79 hp
EEC 80/1269
79 hp
Bore
4 in
Stroke
5.1 in
Displacement
259 in3

Weights
Operating Weight
26410 lb
Operating Weight - Standard Undercarriage
26410 lb

Drive
Maximum Drawbar Pull
20680 lb
Travel Speed
3.4 mph

Swing Mechanism
Swing Torque
23060 lb ft
Swing Speed
10.6 RPM

Hydraulic System
Main Implement System - Maximum Flow (2x)
28 gal/min
Maximum Pressure - Implements
4340 psi
Maximum Pressure - Travel
4980 psi
Maximum Pressure - Swing
3410 psi
Pilot System - Maximum Flow
6.4 gal/min
Pilot System - Maximum Pressure
600 psi
Blade - Maximum Flow
14.1 gal/min
Blade System - Maximum Pressure
2990 psi
Boom Cylinder - Bore
4 in
Boom Cylinder - Stroke
40 in
Stick Cylinder - Bore
4.3 in
Stick Cylinder - Stroke
47 in
Bucket Cylinder - Bore
4 in
Bucket Cylinder - Stroke
37 in

Service Refill Capacities
Fuel Tank
51.5 gal
Cooling System
4.6 gal
Engine Oil
5.2 gal
Swing Drive (each)
.8 gal
Final Drive (Each)
.8 gal
Hydraulic System (Including Tank)
42.3 gal
Hydraulic Tank
24.3 gal

Dimensions
Transport width
98.03 in