311D LRR^Non-Current

Operator Comfort

Experience a spacious, quiet and comfortable operator station. The cab is pressurized to 0.5 bar to reduce the amount of dust that enters the cab, keeping the operator comfortable during the entire shift, while assuring high productivity.
• The comfortable seat adjusts to the operator's size and weight, and the armrests are also height adjustable.
• The new seat has been designed to feature air-suspension and heating systems. Both these attachments are optionally available.
• Low effort joystick controls are designed to match the operator's natural wrist and arm position. Joysticks can be operated with arms on the armrests. The horizontal and vertical strokes are designed to reduce fatigue.
• The front windshield is split 70 (upper)/30 (lower) in order to provide maximum visibility. The upper part is slidable, assisted by a mechanism which reduces operator effort.

Cab Exterior

The Falling Object Guard System (FOGS) can be directly bolted to the cab, enabling the machine to meet all specifications and job site requirements. Thicker steel tubes made according to the solid drawn process contribute to the rigidity of the 311D operator station.

Pre-start Check and Monitor Display

Take advantage of the entirely rethought monitor, designed to simplify machine use by acting as a operator-to-machine interface. It features:
• Full color graphical display
• An on-board servicing scheduler (displaying recommended actions such as oil and filter changes)
• 20 different available languages
• Video display capability

Engine

The Cat C4.2 engine with ACERT Technology optimizes performance and meets EU Stage IIIA emissions regulations. In conjunction with integrated electronics, ACERT Technology reduces emissions during the combustion process by using advanced technology in the air and fuel systems. The Cat C4.2 engine delivers exceptional power, allowing more hydraulic pressure to drive productivity and reduce your cost per ton of material moved.

Fuel Economy

• Automatic Engine Control, Fuel Delivery and Manual Low Idle Function. A two-level control with one-touch command maximizes fuel efficiency and reduces sound levels during no-load or lighter-load applications. Fuel delivery is managed by the ADEM A4 Engine Controller for the best performance per liter of fuel used. Flexible fuel mapping allows the engine to respond quickly to varying application needs. Electronic controls govern the fuel injection system. Multiple injection fuel delivery involves a high level of precision. Consequently, the carefully shaped combustion cycle lowers the combustion chamber temperatures, generates fewer emissions and thus optimizes fuel consumption. For you, this means more work output for the same amount of fuel consumed.
• Economy Mode. A new Economy Mode function is now standard: thanks to this device, you can adapt the performance of the machine to the work that needs to be done. By using a menu in the monitor, decide, whether you want to switch the Economy Mode on or off, and thus choose whether you want to operate fuel-efficiently or whether you want to use the full power of the machine, in order to boost productivity.
• ODPS. On Demand Power Supply is a new feature, constantly regulating engine power supply, based on the power demanded by the machine hydraulic system. This machine reduces fuel consumption and machine noise in light duty applications.

Crankshaft and Pistons

A forged one-piece, induction hardened crankshaft enhances balance, decreases vibration and improves abrasion resistance. Heat resistant, aluminum alloy pistons have a short compression height for greater efficiency and longer life.

Electronic Control Module (ECM)

The ECM works as the “brain” of the engine's control system, responding quickly to the operating variables to maximize engine efficiency. Fully integrated with sensors in the engine's fuel, air, coolant and exhaust systems, the ECM stores and relays data on conditions such as rpms, fuel consumption and diagnostics.

Outstanding Performance

With two percent more hydraulic pressure for additional lift and breakout forces, the 311D's hydraulic system is designed for high efficiency and performance. The new compact design utilizes shorter tubes and lines, reducing friction and pressure drops, resulting in a more efficient use of power.
• Hydraulic snubbers at the rod end of the boom cylinders and both ends of the stick cylinder cushion shock, reduce sound and increase cylinder life.
• Flow is reduced to a minimum when controls are in neutral to reduce fuel consumption and extend component life.
• Electronic under speed control electronically adjusts pump output so that it doesn't exceed engine power, preventing the need to reserve engine power to avoid engine stalls.
• Hydraulic cross sensing system uses two hydraulic pumps up to 100% of engine power under all operating conditions, improving productivity with faster implement speeds and quicker, stronger pivot turns.

Boom and Stick Regeneration Circuit

The boom and stick regeneration circuit saves energy during boom-down and stick-in operation, increasing efficiency and lowering operating costs. What is more, regeneration during boom down operations is electronically assisted. This system increases hydraulic flow regeneration, which leads to faster operations and reduced pressure loss, and hence improved fuel efficiency.

Two Pump Flow

The two pump combined option, available with the single action control circuit option, allows for increased productivity in single action applications.

Priority Circuits

The 311D LRR uses a boom priority circuit and a swing priority circuit. It has an automatic boom and swing priority function which selects the best mode, based on the amount of lever movement. This system eliminates the need for mode selection, simplifying operations and optimizing performance in different applications. By gradually switching to a priority circuit, rapid flow changes are prevented, and smooth operations are ensured, measuring up to the operator's expectations. As a result, thanks to this automated system, the machine is simpler to operate and therefore more agreeable to use.

Medium Pressure Circuit

The Medium Pressure Circuit is available as an attachment for work tools requiring moderate hydraulic flow, such as rotating buckets or shears.

High Pressure Circuit

The High Pressure Circuit is available as an attachment for work tools requiring high hydraulic flow and pressure, such as hammers, processors and shears.

Undercarriage and Structures

Caterpillar uses advanced engineering and software to analyze all structures, creating a durable, reliable machine for the toughest applications. More than 70% of the structural welds are robotic and achieve over three times the penetration of manual welds. These structural components and undercarriage are the backbone of the machine's durability.

Long Undercarriage

The standard for the 311D is the long undercarriage, which features longer track length by 170 mm compared to the standard undercarriage. Thanks to this configuration improvement, enjoy improved stability in all conditions.

Blades

Two blades (2500 and 2700 mm) are optionally available with the 311D for improved stability and lifting ability.

Improved Drawbar Pull

Drawbar pull has increased by 20%, which results in higher system pressure tolerance, so that you can enjoy improved maneuverability on slopes and in muddy underfoot conditions.

Bottom guards

Track alignment while traveling and working on slopes is assured, thanks to the idler guard, and the bolt-on center guard, which are standard on the 311D LRR.

Spring Recoil System

Machine reliability is improved, thanks to a perfected absorbing system which relieves abnormal track tensions, made possible by an 18% increase of the recoil system stroke.

Carbody Design

X-shaped, box section carbody provides excellent resistance to torsional bending. Robot-welded track roller frames are press-formed, pentagonal units that deliver exceptional strength and service life. Idler and center guards are standard to help maintain track alignment when traveling or working on slopes.

Travel Motors

Travel Motors with automatic speed selection let the 311D automatically change up and down from high and low speeds in a smooth controlled manner.

Front Linkage

Built for performance and long service life, Cat booms and sticks are welded, box section structures with thick multi plate high strength steel fabrications. Service intervals are extended with self lubricating pins that resist corrosion and galling for superior durability.

Reach Boom

The 4300 mm reach boom is designed for maximum digging capability and is robotic welded to ensure consistent quality. This allows excellent all around versatility and a large working envelope.

Optional Variable Angle Boom

A new optional VA boom is available to suit all your applications in small space conditions, and achieve greater versatility.

Stick

Two stick lengths are available (2250 and 2800 mm), in order to offer maximum flexibility in machine configuration and therefore to meet a wide range of applications. What is more, all the boom and stick linkages of the 311D are compatible with those of the 311C.

Hydraulic and Pilot Configurations

High pressure systems, medium pressure systems and hydraulic controls are available as independent and combinable attachments to configure the most adapted machine to your specific job needs.

Control

An optional foot switch is available. This switch has two positions: ON/OFF, and does not provide modulation. Alternatively, an optional pedal provides foot pedal modulation.

Work Tools

Caterpillar offers a variety of work tools including hammers, grapples, multiprocessors, shears, pulverizers, and vibratory compactors to fit your application needs. Additionally, a wide range of buckets are available to optimize machine performance. Auxiliary hydraulic and electrical lines are routed to the boom foot for easier installation of auxiliary hydraulic circuits, therefore reducing time, part and cost required to add a work tool. Furthermore, all pins are interchangeable between the C and the D series models.

Tool Control

The Tool Control system is installed as standard and offers up to 10 flow and pressure pre-settings, for easier and quicker tool readiness. Combined with the Quick Coupler, the tool control system allows you to change from one hydraulic work tool to the next.

Quick Coupler

This hydraulic tool holder increases machine versatility by making the change from one hydraulic work tool to another quick and easy. Moreover, a Universal Quick Coupler control now accepts all hydraulic Quick Coupler systems with pressures ranging up to full machine pressure (350 bar).

Cat K-series Tooth System

This feature provides a reliable tip retention and easy tip installation and removal.

Cat Product Link

The 311D is pre-wired to accept Product Link systems to install in the field. Product Link assists with fleet management by tracking hours, location and machine health.

High Ambient Cooling Package

Thanks to the new EU compliant High Ambient Cooling Package, take the machine to work in temperatures up to 48 °C.

Serviceability

Designed with the service technician in mind, many service locations are at ground level so critical maintenance can be done quickly and efficiently. Longer maintenance intervals reduce cost and increase machine availability.
• Oil level gauge, fuel filter and priming pump are conveniently located on the right side of the engine structure for easy maintenance.
• An optional electronic fuel water sensor is available to alert the operator when the water level is high.
• The Product Link assists with fleet management by tracking hours, location and product health.
• New anti skid plates over the top of the storage box and upper structure help prevent slipping and mud from falling into the upper structure.

Sampling Ports

Equipped with S•O•S sampling ports and test ports for hydraulics, engine oil and coolant for quick diagnostics. A test connection for the Cat Electronic Technician (Cat ET) service tool is now located in the cab.

Air Cleaner

A double layered filter core in the radial seal air filter gives more efficient filtration. A warning is displayed on the monitor when dust accumulates above a preset level. This filter is conveniently located in the compartment behind the cab.

Capsule Filter

Capsule-type, hydraulic return oil filter is accessible from outside the tank and prevents contaminants from entering the system during hydraulic oil changes.

Cat Product Link

The 311D LRR can be equipped with Product Link PL321SR as optional feature. This system provides permanent location, operating hours and machine health information through GPS ways and Internet tools. Product Link improves machine availability and lowers operating costs.

Customer Support

Your Cat dealer is ready to assist you with your purchase decision and everything after.
• Make detailed comparisons of the machines you are considering before you buy with estimates of component life, preventive maintenance and the true cost of production
• Customize the machine that is right for you by using Build and Quote applications on your dealer's website or www.cat.com
• Get the latest training literature and trained staff
• Repair option programs guarantee the cost of repairs upfront
• Financing packages are flexible to meet your needs
• Your Cat dealer can evaluate the cost involved in repairing, rebuilding and replacing your machine so you can make the right choice.