Milton CAT 321 D LCR User Manual

Engine

Engine Model Cat®C6.4 ACERT™
Net Flywheel Power 110 kW 148 hp

Weights

Operating Weight – 23 530 kg 51,875 lb
Long Undercarriage

• Reach boom, R2.9B1 (9 ft 6 in) Stick, 0.9 m3(1.18 yd3)
Bucket, 600 mm (24 in) Shoes

Operating Weight – 24 180 kg 53,308 lb
Long Undercarriage 2

• Reach boom, R2.9B1 (9 ft 6 in) Stick, 0.9 m3(1.18 yd3)
Bucket, 800 mm (32 in) Shoes

321D LCR

Hydraulic Excavator

®

®

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321D LCR Hydraulic Excavator

The D Series incorporates innovations for improved performance and versatility.

The Caterpillar 321D LCR excavator
provides all the elements to give you the
lowest cost to own and operate. At the end
of the day, it all comes down to how much
work you got done and how much did it cost
you. Caterpillar and the 321D LCR offer
you the tools to help lower your owning
and operating costs.

Versatility

Caterpillar offers a wide variety of
factory-installed attachments that
enhance performance and job site
management. pg. 12

Hydraulics

The hydraulic system has been designed
to provide reliability and outstanding
controllability. An optional Tool
Control System provides enhanced
flexibility. pg. 6

C6.4 with ACERT™ Technology

ACERT™ Technology works at the
point of combustion to optimize engine
performance and provide low exhaust
emissions to meet U.S. EPA Tier 3
emission regulations, with exceptional
performance capabilities and proven
reliability. pg. 5

✔

Compact Radius

The 321D LCR is a “Compact Radius”
machine developed so that it can work
in the narrow job-site. The cylindrical
upper frame and cylindrical operator
station, allow the 321D LCR to rotate
in the narrower job-sites. pg. 4

Work Tools – Attachments

A variety of work tools, including
buckets, couplers, hammers, and shears
are available through Cat®Work Tools.

pg. 11

✔

✔ New Feature

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Complete Customer Support

Your Cat®dealer offers a wide range
of services that can be set up under a
customer support agreement when you
purchase your equipment. The dealer
will help you choose a plan that can cover
everything from machine configuration
to eventual replacement. pg. 14

Service and Maintenance

Fast, easy service has been designed
in with extended service intervals,
advanced filtration, convenient filter
access and user-friendly electronic
diagnostics for increased productivity
and reduced maintenance costs. pg. 13

✔

Booms, Sticks and Bucket Linkages

The bucket linkage pins on the mass
excavation configuration have been
enlarged to improve reliability and
durability. pg. 10

Operator Comfort

Provides maximum space, wider
visibility and easy access to switches.
The monitor is a full-color graphical
display that allows the operator to
understand the machine information
easily. Overall, the new cab provides
a comfortable environment for the
operator. pg. 8

✔

Structures

Caterpillar®design and manufacturing
techniques assure outstanding durability
and service life from these important
components. pg. 7

Compact Radius. The 321D LCR features
a compact radius design, which makes
it ideal for working in space restricted
areas such as: close to buildings, road
construction – limiting lane closures
or logging roads. The tail swing is
just 1.68 m (5'6") as compared to the

2.75 m (9'0") on the 320D. When rotated
90 degrees and working over the side,
a minimal amount of counterweight
extends beyond the track width.

Operator Confidence. Due to the
321D LCR’s compact working
envelope, operators can work
confidently knowing that the
counterweight will not swing
into any object behind them.

Comfort. The cab on the 321D LCR is
a comfortable place to work, with low
sound levels, good visibility and
convenient access to switches and
controls. The 321D LCR cab offers
many of the same amenities and
options found in the cab of the
320D/320D LRR.

Working Envelope. To further minimize
the working envelope, the boom is
repositioning more towards the center
of the machine as compared to a
standard excavator. This reduced the
front swing radius when the boom is
pulled all the way up and the stick
brought in completely. This design
also increases the lift capacity of the
321D LCR over the front as it has a
better mechanical advantage when
compared to a standard excavator.

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Compact Radius

The 321D LCR delivers exceptional performance and comfort.

Cat C6.4. The Cat C6.4 with ACERT™
Technology introduces a series of
evolutionary, incremental improvements
that provide breakthrough engine
technology. The building blocks of
ACERT Technology are fuel delivery,
air management and electronic control.
ACERT Technology optimizes engine
performance while meeting U.S. EPA
Tier 3 emission regulations. With its
proven technology, robust components
and precision manufacturing, you can
count on this engine to power up at start
time and keep working productively all
shift long.

Performance. The 321D LCR, equipped
with the C6.4 engine with ACERT™
Technology, provides 7% more power
as compared to the 3066TA in the
321C LCR. The additional power
delivers a speed and efficiency advantage
in high production applications.

Automatic Engine Speed Control.

The two-stage, one-touch control
maximizes fuel efficiency and reduces
sound levels.

ADEM™ A4 Engine Controller.

The ADEM A4 electronic control module
manages fuel delivery to get the best
performance per liter of fuel used.
The engine management system provides
flexible fuel mapping, allowing the
engine to respond quickly to varying
application needs. It tracks engine and
machine conditions while keeping the
engine operating at peak efficiency.

Electronic Control Module.

The Electronic Control Module (ECM)
works as the “brain” of the engine’s
control system, responding quickly to
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 information on conditions such
as rpm, fuel consumption, and
diagnostic information.

Fuel Delivery. The Cat C6.4 features
electronic controls that govern the fuel
injection system. Multiple injection
fuel delivery involves a high degree
of precision. Precisely shaping the
combustion cycle lowers combustion
chamber temperatures, generating
fewer emissions and optimizing fuel
combustion. This translates into more
work output for your fuel cost.

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C6.4 with ACERT™ Technology

The Cat®C6.4 gives the 321D LCR exceptional power and fuel efficiency unmatched in the
industry for consistently high performance in all applications.

Component Layout. To optimize
efficiency of hydraulic performance,
the hydraulic components are located
close together, which reduces friction
loss and pressure drops in the lines.

System Pressure. System pressure has
been increased to 35 000 kPa (5,076 psi),
which attributes to improved
performance:

• Increased stick and bucket forces
(up 7% higher than the 321C LCR)
to better handle those tight digging
conditions

• More drawbar pull (206 kN/46,322 lb)
to provide more ability to climb
slopes, easier spot turns and
improved travel in poor underfoot
conditions

• More lift capacity, generally over
the front where you are generally
hydraulically limited

Heavy Lift. The 321D LCR features the
addition of a heavy lift, which increases
system pressure to 36 000 kPa (5,220 psi),
giving even more lift capacity over
the front. Heavy Lift is activated be
depressing the soft switch on the right
hand console. As the pressure increases,
the engine speed is reduced, which allows
better control while lifting objects.

Pilot System. The pilot pump is
independent from the main pumps and
controls the front linkage, swing and
travel operations.

Hydraulic Cross Sensing System.

The hydraulic cross sensing system
utilizes each of two hydraulic pumps to
100 percent of engine power, under all
operating conditions. This improves
productivity with faster implement
speeds and quicker, stronger pivot turns.

Boom and Stick Regeneration Circuit.

Boom and stick regeneration circuit
saves energy during boom-down and
stick-in operation which increases
efficiency, reduces cycle times and
pressure loss for higher productivity,
lower operating costs and increased
fuel efficiency.

Auxiliary Hydraulic Valve. The auxiliary
valve is standard on the 321D LCR.
Control Circuits are available as
attachments, allowing for operation of
high and medium pressure tools such as
shears, grapples, hammers, pulverizers,
multi-processors and vibratory plate
compactors.

Hydraulic Cylinder Snubbers.

Snubbers are located at the rod-end of
the boom cylinders and both ends of the
stick cylinders to cushion shocks while
reducing sound levels and extending
component life.

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Hydraulics

Cat®hydraulics deliver power and precise control to keep material moving.

Robust Undercarriage. A solid
foundation built tough to absorb the
stresses of everyday work.

• Rollers and idlers are sealed and
lubricated to extend service life.

• Track links are assembled and sealed
with grease to decrease internal
bushing wear and increase life by
as much as 25%, when compared
to dry seal undercarriages.

• Spring recoil system stroke has been
increased to better relieve excess
track tension, which can occur when
material builds up between the track
and sprocket.

Rugged Structures. Structural
components and the undercarriage
are the backbone of the machine’s
durability. Caterpillar places a lot of
emphasis on the machine’s durability
during the designing and manufacturing
of its excavators.

• Up to 95% of the structural welds
are welded by robots, which achieve
up to three times the penetration of a
manual weld and improving overall
durability of the machine.

• The 321D LCR’s main frame
utilizes high-tensile strength steel
and a one-piece swing table, which
improves strength and reliability.

• The carbody has a X-shaped, box
section design to resist bending and
twisting forces.

• Track roller frames are press-formed
in a pentagonal shape for additional
strength.

Engine Hood. The 321D LCR features a
one-piece, flat engine hood. The engine
hood opens backwards and is located in
a place that does not obstruct access to
inspection points in the engine
compartment.

Counterweight. The counterweight
is split into two pieces for improved
serviceability. The top piece weighs
approximately 2268 kg (5,000 lb), and
the bottom weighs 3832 kg (8,450 lb).
The counterweight is a rounded cast
structure that minimizes the amount
of overhang.

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Structures

321D LCR is designed to handle the most rugged operating conditions, while providing long
life and value.

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Caterpillar offers the most intuitive and easy to operate excavators while providing great all
around visibility and exceptional operator comfort.

Operator Comfort

Operator Station. 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.

• Consoles and armrests have been
redesigned for better comfort and
adjustability.

• More seat options – choose from
the standard mechanical suspension
seat, or the optional air suspension
seat with heater. Both provide
excellent comfort.

Standard Cab Equipment. To enhance
operator comfort and productivity,
the cab includes a lighter, drink holder,
coat hook, service meter, literature
holder, magazine rack and storage
compartment.

Joystick Control. Joystick controls have
low lever effort and are designed to
match the operator’s natural wrist and
arm position.

Hydraulic Activation Control Lever.

For added safety, this lever must be
in the operate position to activate the
machine control functions.

Climate Control. Climate control adjusts
temperature and flow, and determines
which air outlet is best in each situation
with a touch of a button.

Cab Exterior. The cab is made of
pressed-steel plates. The pillars, beams
and crossbeam, are formed box-shape,
which improves the resistance of fatigue
and vibration.

Hand Control Pattern Changer
(Optional). Switches the joystick

pattern between ISO and SAE patterns.
For easy access, the pattern changer is
located in the cab, underneath the floor
mat. In order to change positions, simply
remove the bolt, slide the lever into the
appropriate location, then secure the bolt.

Sliding Door. The cab door slides
alongside the cab and takes less space
to open and close than a hinged door.
This unique design allows the operator
to easily get in and out of the cab when
working next to objects or walls.

Skylight. An enlarged skylight with
sunshade provides excellent visibility
and ventilation.

Monitor. The monitor is a full color
Liquid Crystal Display that gives
you vital operating and performance
information, alerts in text, all in a
simple, east to navigate format.

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

Main Menu. Four menu options
to choose from:

Settings – Adjust monitor settings,
select work tool or choose video mode
(when equipped with a camera)

Maintenance – Displays service
intervals and hours accumulated since
last serviced.

Performance – Displays machine
performance attributes such as Engine
Speed, Coolant and Hydraulic Oil
Temperature.

Service – Allows access to machine
parameters for service intervals,
diagnostic information and information
related to the machines software.

Event Display. Machine information is
displayed in this area with the icon and
language.

Multi-information Display. This area
is reserved for displaying various
information which is convenient for the
operator. The “CAT” logo is displayed
when no information is available to be
displayed.

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