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374D L
Hydraulic Excavator
Engine |
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Engine Model |
Cat® C15 ACERT® (ATAAC) |
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Net Power – ISO 9249 |
355 kW |
476 hp |
Net Power – SAE J1349 |
355 kW |
476 hp |
Weights |
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Operating Weight – Long Undercarriage |
71 132 kg |
156,819 lb |
Drive |
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Maximum Travel Speed |
4.1 km/h |
2.6 mph |
Maximum Drawbar Pull – Long Undercarriage |
492.5 kN |
110,718 lb |
374D L Features
Performance
High level of sustained production, improved trenching and pipe-laying performance, improved reliability and durability increase your productivity and lower your operating costs.
Engine
The Cat® C15 engine uses ACERT® Technology to meet U.S. EPA Tier 3 emission regulations, with exceptional performance capabilities and proven reliability.
Operator Station
Superior cab comfort and visibility provides an excellent working environment. The monitor is a full-color, graphical display with enhanced functionality to provide a simple, comprehensive machine interface.
Maximum Versatility
A variety of work tools, including buckets, are available for applications such as demolition, site clean-up, scrap processing, breaking up road surfaces and bedrock through Cat® Work Tools.
Service and Maintenance
Fast, easy service has been designed in with long service intervals, advanced filtration, convenient filter access and user-friendly electronic diagnostics for increased productivity and reduced maintenance costs.
Contents |
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Hydraulics............................................................. |
3 |
Operator Station.................................................. |
4 |
Engine.................................................................... |
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Control System..................................................... |
6 |
Structures............................................................. |
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Undercarriage...................................................... |
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Front Linkage........................................................ |
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Buckets and Teeth............................................. |
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Work Tools.......................................................... |
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Environment........................................................ |
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Service and Maintenance................................ |
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Complete Customer Support............................ |
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374D L Hydraulic Excavator Specifications.. |
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374D L Standard Equipment............................. |
21 |
374D L Optional Equipment.............................. |
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Notes................................................................... |
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The 374D L Series Excavator has excellent control, high stick and bucket forces, impressive lift capacity, simplified service and a comfortable operator station to increase your productivity and lower operating costs.
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Hydraulics
Cat hydraulics deliver power and precise control to keep material moving
Main Pumps
The hydraulic system includes three pumps with an independent swing circuit. The hydraulic circuit utilizes a load-sensing system to ensure high hydraulic system efficiency and excellent productivity with little hydraulic loss.
•Large, heavy-duty main pumps and a separate swing pump provide quick cycle times during multi-function operation.
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.
Proportional Priority Pressure Compensation (PPPC) Hydraulics
Load-sensing, PPPC system, with Caterpillar-developed electronic actuation, provides high efficiency and excellent controllability.
•Cylinder speed is directly related to operator’s movement of joystick from feathering to full speed.
•Flow to cylinders during multifunctional operation is directly controlled by the operator and is not dependent on loads.
•Controller reduces pump output to minimum to save power when joysticks are in neutral position.
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Operator Station
374D L is designed for simple, easy operation and comfort
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 of 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 KAB seats with adjustable height consoles.
• A rear view camera is offered as an attachment. 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.
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Engine
ACERT® Technology optimizes engine performance
Cat® C15 Engine
The Cat C15 engine with mechanically actuated electronic fuel injection (MEUI) powers the 374D L. The C15 has ACERT® Technology, a series of Caterpillar engineered innovations which provide 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.
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Control System
Electronic management
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
Under normal conditions or the default condition, the monitor display screen is divided into four areas: clock and throttle dial, gauge, event display and multi-information display.
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
Pattern Control Changer
The standard hand control pattern changer can be accessed through the monitor, to utilize either the standard excavator control pattern (SAE) or Backhoe Loader pattern (BHL).
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.
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Structures
Rugged structures designed for maximum durability
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 (6.3 in) 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 increased by 110 mm (4.3 in) from 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 (2.13 in) 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.
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Undercarriage
The link that transmits the reaction forces from digging to the ground
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.
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Front Linkage
Designed for flexibility and high productivity
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 boxsection 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 and long life.
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