Excavatoare de talie mare Cat® 374D L

Main Pumps

• The hydraulic system includes two large, heavy-duty main pumps and a separate swing pump to provide quick cycle time and easier controllability during multi-function operation.
• In case the main pumps reach relief pressure, the High Pressure Cut-off System automatically destrokes the pumps to reduce energy waste and, therefore, improve fuel consumption.
• Controller reduces pump output to save energy when joysticks are in neutral position.

Proportional Priority Pressure Compensation (PPPC) Hydraulics: Main Valve

Load sensing, Proportional Priority Pressure Compensation (PPPC) allows the operator to control the cylinder speed directly related to operator's movement of joystick and not dependent on load for an easier control. Caterpillar developed electronic actuation and offers three predefined modes activated through a switch (Soft, Normal and Quick) to match operator preference and application needs.

Proportional Priority Pressure Compensation (PPPC) Hydraulics: Electrical Regeneration Valve

A hydraulically-operated stick regeneration circuit saves energy and improves multi-function performance during stick-in operation. The boom regeneration circuit is operated electronically, managed by the controller of the machine. The system improves cycle times and fuel efficiency, increasing your productivity and reducing operating costs.

Reverse Swing Dampening Valve

Swing dampening valves reduce swing wag and produce smooth swing stops.

Advanced Features

The following are hydraulic system features of the 374D L.

• The electric re-generation system is incorporated into the hydraulic system to improve productivity and lower fuel consumption.
• The main pump flow has increased 10 percent to provide shorter cycle times.
• The main implement pressure has been increased 9 percent. This also provides shorter cycle times with higher digging forces, increased bucket fill factors.
• Stick cylinder diameter for mass and reach configurations has been increased along with the bucket cylinder diameter on the reach stick. These increases produce 17 percent higher digging forces.

Variable Gauge Undercarriage

The long variable gauge undercarriage is standard, providing a wide, stable base for operating, or a narrow gauge for reduced shipping width. The undercarriage gauge in working position has been increased by 160 mm for improved stability.

Upper Frame

The upper frame is designed for maximum durability and efficient use of materials. The boomfoot, skirt and counterweight mounting area have been strengthened for longer service life and increased durability.

• Outer frame utilizes curved side rails, which are die-formed for excellent uniformity and strength through the length
• Box section channels improve upper frame rigidity under the cab
• Boom tower and one piece main rails are constructed of solid, high-tensile strength steel plates

Catwalk

The catwalk width has been extended to 500 mm (+28 percent wider than the 365C L). Catwalks are provided on both sides of the skirt for easy access of the maintenance points. Slip resistant plates are used on the full length of the catwalks.

Cross Roller Bearing

The 374D L swing bearing is a cross roller type, with 54 mm diameter rollers. The cross rollers have a much greater contact area than ball bearing, providing increased stability and longer life.

Track Roller Frames

The track roller frame is made of thick, steel plate that is bent into a U-shape and welded to the bottom plate to create a box structure. The box structure design provides increased rigidity and impact resistance.

Increase Machine Versatility

The Cat combination of machine and tool provides a total solution for just about any application. Work tools can be mounted directly to the machine or a quick coupler can be added, making it quick and easy to release one work tool and pick up another.

Quick Couplers

Cat quick couplers enable the operator to simply release one work tool and pick up another. Your hydraulic excavator becomes highly versatile. The dedicated CW-Series quick coupler enables a quick tool exchange while maintaining top machine performance. A lifting hook is added for maximum lift capacity.

Work Tools

An extensive range of Cat Work Tools for the 374D L includes buckets, hammers, grapples, shears, multi-processors and rippers. Each are designed to optimize the versatility and performance of your machine. Cat Work Tools and couplers are ready to work in a variety of applications, such as site and structure demolition, debris clean-up, truck loading, scrap processing, breaking road surfaces and bed rock.

Hydraulic Kits

Caterpillar offers field-installed hydraulic kits designed to simplify the process of ordering and installing the right kit. Modular kit designs integrate Cat Work Tools with Cat Hydraulic Excavators. Every kit is easy to install. Hoses are pre-made, tubes are pre-bent and pre-painted and there are comprehensive instructions.

Cat C15 Engine

The Cat C15 engine with mechanically actuated electronic fuel injection (MEUI™) powers the 374D L. The C15 has ACERT Technology which provides advanced electronic control, precision fuel delivery and refined air management compliance.

Increased Power

The maximum power is 355 kW (476 hp), 18 percent more power than the 365C. The Power Management System (PMS) is also available to manage productivity and fuel economy.

Improved Fuel Efficiency

The 374D L fuel maps provide additional power and performance with optimized fuel consumption through flexible power settings incorporated into ADEM™ controller.

Improved Reliability

The titanium-aluminum alloy rotor in the turbocharger improves reliability/durability and contributes to faster response of the turbocharger.

Hydraulic Cooling Fan

The 374D L uses a variable speed, hydraulically-driven fan for quieter operation and reduced fuel consumption during cooler ambient conditions.

Reversible Fan

A reversible fan option is offered as an attachment. The reverse function is operated through the monitor. By selecting this function, the fan rotates in the opposite direction for a preset time to help clean the cooling package for increased uptime and reduced service cost.

Service Intervals

Long service intervals reduce maintenance costs. Engine oil, oil filter and fuel filters are at 500 hours.

Oil Sample and Pressure Ports

Oil sample and pressure ports provide easy checking of machine condition and are standard on every machine.

Hydraulic Capsule Filters

The return filters or capsule filters for the hydraulic system are located beside the hydraulic tank. The filter elements are removable without spilling hydraulic oil.

Service Points

Service points are centrally located with easy access to facilitate routine maintenance.

Pilot Hydraulic System Filter

Pilot hydraulic system filter keeps contaminants from the pilot system and is located in the pump compartment.

Remote Greasing Block

A concentrated remote greasing block on the boom delivers grease to hard-to-reach locations.

Radial Seal Cleaner

Radial seal main air cleaner with precleaner has a double-layered filter element for more efficient filtration. No tools are required to change the element.

Fuel-Water Separator

The water separator removes water from fuel, even when under pressure, and the water level can be monitored in the cab.

Rock Scraping (1)

Scraping rock and finishing work is easy and fast. SmartBoom simplifies the task and allows the operator to fully concentrate on stick and bucket, while boom freely goes up and down without using pump flow.

Hammer Work (2)

It has never been this productive and operator-friendly. The front parts automatically follow the hammer while penetrating the rock. Blank shots or excessive force on the hammer are avoided resulting in longer life for the hammer and the machine. Similar advantages are applicable when using vibratory plates.

Truck Loading (3)

Loading trucks from a bench is more productive and more fuel efficient as the return cycle is reduced while the boom down function does not require pump flow.

Emissions

ACERT® Technology is a differentiated technology that reduces emissions at the point of combustion. The technology capitalizes on proven Caterpillar leadership in three core engine systems: fuel, air and electronics.

Electro Magnetic Compliance

The 374D L meets the following EMC (Electro Magnetic Compliance) requirements:

• ISO 13766 Earth Moving Machinery - Electromagnetic compliance
• EU Directive 89/336/EEC
• Aus EMC Framework

Fluid Management

Several serviceability elements are designed into the 374D L to limit fluid spillage while performing routine maintenance.

Ecology Drains

Ecology drains are provided for the fuel and hydraulic tanks, allowing fluids to be captured in a container when draining the tanks.

Front Linkage

Cat excavator booms and sticks are built for performance and long service life.

• Castings and forgings are used at high stress areas such as boom nose, boom foot, boom cylinder and stick foot.
• All booms and sticks are stress-relieved for optimal life and durability, while minimizing weight for improved performance.
• All booms and sticks are ultrasonic inspected.

Bucket Linkage

Two bucket linkages are available for the 374D L. Both linkages are available with or without a lifting eye on the power link.

• The VB2 bucket linkage is for use with the reach sticks and VB2-family buckets
• The WB2 bucket linkage is for use with the mass sticks and WB2-family buckets

Boom Construction

374D L booms feature a large cross-section to improve strength and reduce weight. Baffle plates reinforce the boom interior for higher rigidity. Booms are designed for strength and maximum payload.

Stick Construction

Sticks are made of high-tensile strength steel in a box-section design, making them strong and light. All sticks are reinforced with a thick baffle plate for added rigidity. The connection between stick and boom is made of forged steel, and a thick steel plate is used at the bucket connecting location for increased strength and rigidity at load-bearing points. An additional wear plate is added to the working side of the stick for protection. All mass sticks include additional wear bars on the working side to protect the structure during operation. There are four reach sticks and two mass sticks available to meet your application needs.

Linkage Pins

Bucket cylinder pin and idler to stick pin diameter for the reach boom have been increased. The pins have thick chrome plating for high wear resistance long life.

Monitor Display Screen

The monitor is a full color, 400 × 234 pixels Liquid Crystal Display (LCD). A master caution lamp blinks ON and OFF when one of the critical conditions below occurs:

• Engine oil pressure low
• Coolant temperature high
• Hydraulic oil temperature high

Gauge Display

Three analog gauges, fuel level, hydraulic oil temperature and coolant temperature are displayed in this area.

Electronic Joysticks

Electronic joysticks provide features not possible with hydraulic pilot valves:

• Eliminate pilot lines in cab for quieter operation
• Simple pattern change through the monitor

Operator Gain/Response

This is used to suit the operator preference or application.

• Quicker for fast response
• Slower, for more precision
• Contains three preset settings with 21 available

Tool Control

The unique Cat control system optimizes work tool performance and makes changeovers quick and easy. Operators can select from up to 10 pre-programmable settings from the monitor.

Alternator

The alternator is 24 volt with 75 amp capacity and is driven by a serpentine belt off the front pulley. A snorkel pulls cool, clean air from the outside for increased service life.

Product Link™

Product Link is standard on the 374D L. Product Link transmits diagnostic information from the machine back to Caterpillar, Cat dealers and customers.

Cab Design

The spacious cab provides visibility and ergonomics. The monitor is a full-color graphical display to provide the operator with easy-to-read, comprehensive machine information. The cab provides a comfortable environment for the operator.

Hydraulic Activation Control Lever

The hydraulic activation control lever deactivates hydraulic functions during engine start-up and prevents unintentional machine operation.

Cab Exterior

Utilizes thick steel tubing along the bottom perimeter of the cab, improving the resistance to fatigue and vibration. The cab structure allows the FOGS to be bolted directly to the cab, at the factory or as an attachment.

Cab Mounts

The cab shell is attached to the frame with viscous rubber cab mounts, which dampen vibrations and sound levels while enhancing operator comfort.

Additional Features

The 374D L operator station has many features for operator comfort.

• Premium air suspension, heated seats with adjustable height consoles.
• A rearview camera is standard in Europe. The monitor functions as the display screen for the camera, providing added safety for the operator and surrounding work area.
• HID (High Intensity Discharge) lights are available as an attachment with time delay for the boom and cab lights.
• A two-way radio ready option is available.
• Automatic climate control for the air conditioner, heater and defroster.
• Fuel consumption can be displayed numerically on the monitor.

Product Support

Cat dealers utilize a worldwide computer parts network to minimize machine downtime. Save money with Cat remanufactured components.

Machine Selection

Make detailed comparisons of machines you are considering. What are job requirements and machine attachments? What production is needed? Your Cat dealer can provide recommendations.

Purchase

Consider financing options and day-to-day operating costs. Look at dealer services that can be included in the machine's cost to yield lower owning and operating costs over time.

Customer Support Agreements

Cat dealers offer a variety of product support agreements and work with you to develop a plan to meet specific needs. These plans can cover the entire machine, including attachments, to help protect your investment.

Operation

Improving operating techniques can boost your profits. Your Cat dealer has videos, literature and other ideas to help you increase productivity, and Caterpillar offers certified operator training to help maximize the return on your investment.

Maintenance Services

Repair option programs guarantee repair costs up front. Diagnostic programs such as Scheduled Oil Sampling, Coolant 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.

Optimized Package

Caterpillar offers a wide range of buckets, each designed and field tested to function as an integral part of your excavator. All Cat Buckets feature Cat K Series™ GET (Ground Engaging Tools). Buckets are available in four levels of durability and are built to take full advantage of the machine's power.

General Duty (GD)

General Duty buckets are designed for use in low impact, lower abrasion materials such as dirt, loam and mixed compositions of dirt and fine gravel.

Heavy Duty (HD)

Heavy Duty buckets are the most popular and a good “centerline” choice. This bucket style is a good starting point when application conditions are not known. Heavy Duty buckets are designed for a wide range of impact and abrasion conditions including mixed dirt, clay and rock.

Severe Duty (SD)

Severe Duty buckets are designed for higher abrasion conditions such as shot granite. When compared to the Heavy Duty bucket, wear bars and wear plates are substantially thicker and larger for added protection.

Extreme Duty (XD)

Extreme Duty buckets are designed for very high abrasion conditions such as granite quarries. Corner shrouds have been added and side wear plates are larger for added protection.

Undercarriage

The undercarriage supports the swing bearing and upper structure and is the link that transmits the reaction forces from digging to the ground. The strength of the undercarriage plays a major factor in machine stability and durability.

Track Roller Frame

The track roller frame has been improved by installing a longer stroke recoil spring and lowering the front idler. The longer recoil spring improves durability and service life of the undercarriage while the offset idler increases the stability of the machine while working over the front.

Positive Pin Retention 2 (PPR2)

Track links with the PPR2 are provided as standard on the 374D L. The PPR2 track link is designed to prevent looseness of the track pin in the track link and to reduce stress concentrations. The PPR2 system eliminates pin walking for increased service life.

Carrier Rollers

The carrier rollers use a floating “Duo-Cone™” seal. The Duo-Cone seal protects the moving parts in the carrier roller from water and dirt, and makes lubrication maintenance-free.

Forged Idler

The more durable forged idler is standard on the 374D L.