Milton CAT 374D L User Manual
374D L
Hydraulic Excavator
Engine
Engine Model Cat
Net Power – ISO 9249 355 kW 476 hp
Net Power – SAE J1349 355 kW 476 hp
Weights
Operating Weight – Long Undercarriage 71 132 kg 156,819 lb
®
C15 ACERT® (ATAAC)
Drive
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
Hydraulics ............................................................3
Operator Station ..................................................4
Engine ...................................................................5
Control System ....................................................6
Structures.............................................................7
Undercarriage .....................................................8
Front Linkage .......................................................9
Buckets and Teeth ............................................10
Work Tools ..........................................................11
Environment .......................................................12
Service and Maintenance ...............................13
Complete Customer Support ...........................14
374D L Hydraulic Excavator Specifications ..15
374D L Standard Equipment ............................21
374D L Optional Equipment ..............................22
Notes ...................................................................23
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.
2
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 efciency
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 ow 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 ll factors.
• Stick cylinder diameter for mass and reach congurations
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 efciency 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.
3
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.
4
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 rened 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 exible 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.
5
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.
6
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 efcient 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.
7
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 oating “Duo-Cone” seal. The Duo-Cone seal protects the moving parts
in the carrier roller from water and dirt, and makes lubrication maintenance-free.
8
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. Bafe 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 bafe 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.
9
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