INTRODUCTION

311D/312D/314D HYDRAULIC EXCAVATORS INTRODUCTION

© 2008 CaterpillarInc.

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INTRODUCTION

The 311D/312D/314D Hydraulic Excavators incorporate design innovations and performance improvements from the 311C/312C/314C Hydraulic Excavator Series and are a direct replacement for them.

The machines feature a new cab for greater operator comfort. The cab provides the operator with excellent visibility of processing equipment, trucks, and railcars. The cab, consoles, and joysticks have been improved to provide a better access and understanding of all functions.

The 311D/312D/314D Hydraulic Excavators feature a hydrostatic drive system, Side-By-Side (SBS) pumps, Negative Flow Controlled (NFC) hydraulic system, and pilot operated control valves similar to the 311C/312C/314C.

The machines have a monitoring system similar to that of the 320D.

The 311D/312D/314D HEX is equipped with the C4.2 ACERT™ engine which meets U.S Environmental Protection Agency (EPA) Tier 3 and European Union Stage IIIa emissions control standards.

NOTE: Illustrations of the 311D, 312D and 314D are used in this presentation. Where there is a significant difference it will be noted.

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This chart displays the similarities and differences between the 311D/312D/314D and the 311C/312C/314CHydraulic Excavators. New and improved features include:

Operator's Station: The operator's station has been improved over the previous models. The 312D cab is similar to the 320D and the 311D/314D cabs are similar to the 321D. The layout of the interior has been redesigned to maximize operator comfort and reduce operator fatigue. Frequently used switches have been relocated for easier access.

The consoles and armrests have been redesigned for better comfort and adjustability. More seat options are available to choose from: the standard mechanical suspension seat, or the optional air suspension seat with heater.

Engine: The 311D/312D/314D machines are equipped with a C4.2 Tier III ACERT™ engine.

Monitor: The monitor is a full color Liquid Crystal Display that provides vital operating and performance information, alerts in text, which are all in a simple, easy to navigate format. The monitor is the same as the 320D series machines.

Tool Control: The tool control system for the 311D/312D/314Dis similar in function to the tool control systems for the 320D series machines.

The SmartBoom™ attachment enhances operation of the boom function and significantly reduces the machine cycle times.

Service and maintenance intervals have been extended to reduce machine service time and increase machine availability.

Options include:

Machine Security System (MSS): The Machine Security System (MSS), uses a special Caterpillar key with an embedded electronic chip for controlling unauthorized machine operation.

Product Link: Product Link provides all kinds of information and working parameters through a satellite connection between an onboard computer and the machine. Product Link provided easier fleet management and improved preventive maintenance. PL121 and PL321 are available to chose from.

NOTE: MSS and Product Link are the same systems used on other Caterpillar machines.

AccuGrade: AccuGrade, which provides precise control of the worktool using software.

Auxiliary Hydraulic Options: Auxiliary Hydraulic Options allows you to configure the machine to meet work tool needs, while increasing its versatility and are the same as the 311C/312C/314C.

- Single Function Circuit – suited for tools that require one-way flow with both pumps, such as hammers and vibratory plate compactors.

- Double Function Circuit – suited for tools that require two-way flow, utilizing one pump, such as thumbs or non-rotation grapples or shears.Options include:

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The main implement hydraulic system operation for the 311D/312D/314D machines is very similar to the 311C/312C/314C machines The "D" Series continues using many of the "C" excavator features, such as automatic priorities and tool control systems.

The machines use a negative flow type hydraulic system. The main control valve and pumps are similar to the "C" Series.

The 311D/312D/314D machines can be equipped with a medium pressure circuit to operate an auxiliary motor.

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The optional tool control system maximizes work tool productivity by configuring hydraulic flow, pressure, and operator controls to match a specific work tool. System versatility enables a wide range of tools to be used.

The system stores pressure and flow information for several different work tools. Selectable Cat tools have preset flows and pressures.

The 311D/312D/314D can be equipped with the following factory installed tool control systems:

-System 20

-System 23

-System 24

-Medium pressure (F3 valve)

-Medium pressure (F4 valve)

-Medium pressure (Danfoss valve)