Page 1
Hopper Capacity 6.5 m3(14.1 tonne)
Standard Paving Range
AS4251C Screed 2550-5000 mm
Maximum Paving Width
AS4251C Screed 8000 mm
Cat®C6.6 Engine with ACERT™ Technology
Gross Power (SAE J1995) at 2200 rpm 129.5 kW/174 hp
Net Power (ISO 9249) at 2200 rpm 121.9 kW/163.5 hp
Operating Weight with
AS4251C Screed 19 165 kg
®
AP655D
Asphalt Paver
Page 2
2
High Performance and Operator Comfort Make the AP655D the Perfect Choice
The AP655D sets the standard in performance, operator comfort, ease of use,
mobility and reliability.
C6.6 Engine with ACERT™ Technology
ACERT™ Technology works at the
point of combustion to optimize engine
performance. ACERT™ Technology
incorporates an electronic controller to
precisely deliver multiple injections of
fuel. These multiple injections are
combined with a refined air
management system in order to
generate fewer emissions and optimize
fuel combustion while meeting
European EU Stage IIIA engine
emission regulations. pg. 4
Dual Operator’s Station
The AP655D utilizes dual swing-out
operator’s station with sliding control
console. The stations can be rotated
into five different positions and the
sliding control console provides
operator comfort. The operator’s
stations can be positioned beyond the
machine frame for greater visibility to
the steering guide when matching a
joint or paving near curbs, where
precise paving control is required.
pg. 5
High Capacity Cooling System
The high-capacity top-mounted cooling
system performs efficiently in high
ambient temperatures. The variable
speed fan draws air across the engine
compartment and exhausts it toward the
hopper in order to provide a cooler
working environment for the crew.
pg. 4
Advisor Monitoring System
The LCD Advisor located on the
sliding control console provides an
interactive interface to assist the
operator. The system includes project
planning calculators, start-up checklists,
engine operating parameters and many
other features to assist the operator.
pg. 5
Cat®Asphalt Pavers continue
to lead the industry and meet your
demanding job requirements.
Many easy-to-use features and
technologies have been developed
in order to guide your crew
in producing high quality mats
time and time again. Contact your
Caterpillar
®
Dealer today for
more information.
Screed
The AP655D is available with the
AS4251C double width hydraulic
power extendible asphalt screed,
available with variable frequency
tamper and vibrators and with LPG and
electric heating system. The AS4251C
lay material to the desired width and
depth while providing a smooth finish
with initial compaction. pg. 8
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3
Independent Material Handling System
The material handling system provides
precise mix delivery through the most
proven system in the industry. The
independent operation of the augers and
conveyors reduces component wear and
minimizes the potential for mix
segregation.
Reversible augers and conveyors assist
the crew by reducing handwork and
clean-up. The reversible augers are able
to pull asphalt back into the main
screed area when retracting the
extenders while the reversible
conveyors pull asphalt back into the
tunnels, resulting in limited spillage.
pg. 7
Maneuverability
Cat track-type pavers provide
maneuverability that is unmatched in
the industry. The AP655D utilizes three
steering modes including PAVE,
TRAVEL and MANEUVER. The
MANEUVER mode is unique to
Caterpillar. This mode permits the
tracks to counter-rotate, allowing the
machine to turn within its own
footprint. This unique feature provides
quick mobility in commercial
applications when moving to a new
starting point.
Undercarriage
The AP655D can be equipped with
either the Mobil-trac™ undercarriage or
the steel track undercarriage. The
Mobil-trac system combines the
traction and flotation benefits of a
crawler undercarriage with the mobility,
speed, and ride characteristics of a
wheel paver. A steel track undercarriage
is available as a more economical
alternative. pg. 6
Generator and Auxiliary Power Panel
The optional high capacity generator
quietly powers the standard electric
screed heat system for fast heat-up and
uniform screed plate temperatures.
The optional auxiliary power panel
provides power for lighting and job site
work tools. pg. 8
Versatility Defines the AP655D
The AP655D excels in a wide range of applications from routine commercial jobs to
demanding highway operations.
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4
Cat C6.6 Engine with ACERT™ Technology
ACERT™ Technology incorporates a series of innovations working at the point of
combustion to optimize engine performance while providing high reliability and easy
servicing.
High Capacity Cooling System
The deck-mounted cooling system provides a cool environment by exhausting hot air toward
the hopper, away from operators and ground personnel.
High Ambient Temperature Cooling System. The standard,
high-capacity cooling system provides efficient operation in
high ambient temperatures. The system design provides quiet
operation that benefits the operator and the surrounding
environment.
Efficient Airflow design. The airflow design draws ambient
air across the engine compartment and through the coolers.
This design allows the exhaust air to exit toward the hopper in
order to provide a cooler engine compartment and cooler
operating environment.
Variable Speed Fan. The variable speed fan is electronically
controlled and hydraulically driven to provide on-demand
cooling. This on-demand operation reduces engine power
demand, lowers sound levels, and increases fuel efficiency.
Cat C6.6 Engine with ACERT Technology. The C6.6 engine
provides a full-rated gross power (SAE J1995) of 129.5 kW
(174 hp) at 2200 rpm. Meets European EU Stage IIIA engine
emission regulations.
Turbocharged and Air-To-Air Aftercooling (ATAAC).
The turbocharged air-to-air aftercooling system provides high
horsepower with increased response time while keeping
exhaust temperatures low for long hours of continuous
operation. Air-to-air aftercooling keeps air intake temperatures
down, maximizing fuel efficiency and minimizing emissions.
Sound Reduction features. The C6.6 engine sound reduction
features include composite valve covers with a fully isolated
base, a steel oil pan and a cast iron front cover. The HEUI™
fuel systems rate-shaping technology also provides control of
sound and vibration levels.
Service, Maintenance and Repair. Easier service, maintenance
and repair is accomplished by monitoring key functions and
logging critical indicators. Advanced electronic diagnostic
capabilities are possible using Cat Electronic Technician.
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5
Advisor Monitoring System Simplifies Operation
The sliding control console includes the Advisor Display that provides many unique features
to assist the operator.
Advisor Monitoring System (AMS). The LCD Advisor
provides access to a start-up checklist, operator preferences,
engine and machine operating parameters and “Paving
Calculator”.
The AMS display also allows the operator to:
Calibrate the machine components
Set the automatic engine speed control
Monitor engine rpm’s and operating temperatures
Determine the required paving speed and tonnage
requirements for a particular job
Determine performance parameters such as distance
traveled, operating hours, paving distance, paving hours,
and engine fuel consumption
Set the optional friction steering tension to the operator’s
preference
Operator Comforts for a Productive Environment
The dual operator’s station with sliding control console promotes optimum comfort,
visibility and ease of use.
Dual Operator’s Station. The ergonomic dual operator’s station
incorporates a sliding control console, ground speed indicators,
adjustable suspension seats, armrests and retractable seat belts.
Operator Visibility. The dual swing-out operator’s station can
be positioned in one of five different locations to provide
optimum visibility. The stations can extend beyond the
machine frame for good visibility when paving applications
require precise control.
Sliding Control Console. The sliding control console is fully
equipped with comprehensive controls allowing the operator to
conveniently monitor all machine functions. A lockable vandal
cover protects console controls.
Canopy option. The optional folding canopy provides full
width with two side extending wings for optimum comfort and
protection. The canopy can be lowered manually for easy
transportation.
Advisor Display
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6
Mobil-trac Undercarriage Performs in All Applications
The Mobil-trac™ undercarriage provides superior durability while delivering unmatched
mobility, ride, and traction in a variety of conditions.
Steel Track Undercarriage
The steel track undercarriage is available as an economic alternative to the Mobil-trac.
Quad Rear Bogie. A special quad bogie is positioned near the
rear of the steel track in order to evenly distribute the load.
D3 Track Rails. The steel track system incorporates D3 dozer
track rails. The sealed and lubricated links include a split
master link for dependable performance.
Long Life Bonded Track Pads. The track pads contain a special
rubber compound in order to provide long life and good
traction.
Single Speed Planetary Drive. A variable displacement motor
drives a single-speed planetary that provides variable speed
selection.
Large Ground Contact Area. The steel tracks ground contact
area is 3048 mm long and 356 mm wide. This large footprint
provides uniform weight distribution over the length of the
track.
Mobil-trac Undercarriage. The Mobil-trac undercarriage
combines the flotation and traction benefits of a crawler
suspension with the mobility and ride quality of a wheel-type
paver.
The Mobil-trac system includes a durable, high strength rubber
track belt with a thick outer cover and internal layers of
flexible steel cable.
Large Ground Contact Area. The Mobil-trac’s ground contact
area is 3020 mm long and 406 mm wide. This large footprint
provides uniform weight distribution over the entire length of
the belt.
Choice of Belt Designs. The Mobil-trac system offers a
tread-bar style belt or a smooth belt. Both belt styles are
58 mm thick and provide good performance and wear
characteristics, however, the smooth belt with beveled edges
provides less disturbance on soft base materials.
Two Speed Planetary Drive. A fixed displacement motor drives
a two-speed planetary providing quick mobility around the
job site.
Tread-Bar Belt
Smooth Belt
Two Speed
Planetary
Oscillating Bogies
Friction Drive
Wheel
Automatic Belt
Tensioning System
Single Speed
Planetary
Quad Rear
Bogie
D3 Track
Rails
Automatic Track
Tensioning System
Oscillating
Bogies
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7
Independent Material Handling System Promotes Hands-Free Operation
The material handling system promotes hands-free operation by providing features such as
independent control of each auger and each conveyor.
Precise Mix Delivery. The material delivery system provides
precise mix delivery with minimal operator monitoring. The
left and right conveyors in addition to the left and right augers
are controlled independently.
Outboard-Mounted Conveyor Drives. The conveyors have
outboard-mounted motors, reducers and drive chains that
maximizes the tunnel area and reduces segregation.
Independent Auger Drive. The auger drive assembly is
independent of the tractor which allows the distance between
the two conveyors to be significantly reduced. Keeping the
conveyors close together allows the material to flow together
more easily as it discharges into the auger cavity. The tunnel
and auger design eliminates voids under the chain case in
order to minimize segregation.
Adjustable Auger Range. The auger assembly is hydraulically
adjustable with a range of 215 mm. The ability to adjust the
auger assembly simplifies loading and unloading from a
transport vehicle. Also, when working with larger stone mixes,
the augers can be adjusted to allow the mix to flow
unrestricted under the auger assembly.
Power Folding Front Apron (Optional). The front hopper apron
folds rearward providing good material flow. It reduces clean
out effort and time, a feature the crew will really appreciate.
A switch located on the operating control console provides
power to the hydraulic folding apron.
*Note: The front hopper apron is standard without the power
control and folding wings. Manual operation is required.
Adjustable Push Rollers. The four position adjustable push
rollers provide a contact point between the paver and the truck
to center the load and assist steering while unloading.
1
2
3
4
5
6
7
8
1 Curved Hopper Design
2 Independently Controlled
Conveyors
3 Narrow Chain Guard
4 Folding Front Apron
5 Independent Auger Drives
6 406 mm Auger Diameter
7 Foldable Wings
8 Power Folding Front Apron
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8
Industrial, Single-Phase A.C. Generator. The tractor-mounted
generator provides 25 kW of power at 60 Hz for the electric
screed heat and the auxiliary power panel. Circuit breaker
protection, internal electronic voltage regulation and a dual
bearing design provide reliability.
Choices Available (Belt or Hydraulic Driven). The belt-driven
generator provides full power with a variable frequency when
the engine speed increases above 1275 rpm.
The hydraulic-driven generator provides full power with a
fixed frequency of 60 Hz when the engine speed increases
above 1275 rpm.
Optional Auxiliary Power Panel. The power panel provides
4 kW of power for auxiliary lighting and job site work tools.
The panel includes choice of two 240 V or two 120 V
receptacles, protected for ground fault circuit interrupt (GFCI).
Activating the “Tool Mode” switch provides power at 50 Hz
for frequency sensitive tools.
Optional Generator System Provides Quiet Power
The high capacity generator provides power for the electric screed heat, auxiliary lights
and job site tools.
Screed That Delivers Quality
AS4251C double width hydraulic power extendible asphalt screed provides even material
flow and unparalleled stability that result in smooth, high quality mats.
AS4251C Screed. The screed is available with variable
frequency tamper and vibrators and with LPG or electric
heating system. The screed control panels include material
feeding controls for easy ground crew usage.
Tamper and Vibrator. Automatically operated when the AP655D
advances following a preset ramp. Tamper starting and stopping
ramps are adjustable in order to maintain an optimum mat
finish. The AS4251C screed is equipped with electronic
ignition, automatic and independent adjustment of the
smoothing plate temperature for central and each mobil plate.
LPG Heating System. The system provides high efficiency
burners and optimum thermostatic temperature control.
Electric Heating System. The system provides a tractormounted generator, replaceable heating elements and operator
friendly controls providing a cleaner environment. Feature &
benefits include simple operation, fast heat-up time, multi-zone
heating elements and thermostatic control of all screed plates.
Heavy-duty, user-friendly screed heating control unit with selfdiagnostic control is positioned at the rear of the machine for
easy ground crew usage.
Generator
Auxiliary Power
Panel
The AS4251C screed paves from 2550 mm to 5000 mm.
With mechanical extensions added to both sides, maximum
paving width is 8000 mm.
Page 9
9
Advisor Monitoring System (AMS). The Advisor display lists
diagnostic fault codes for machine functions making
troubleshooting quick and easy.
Manual Overrides. The hydraulic pump solenoids incorporate
manual overrides to assist troubleshooting procedures.
Large Access Doors and Panels. Preventative maintenance
points can be accessed through the large swing open access
doors and panels.
Remote Lubrication Points. Lubrication points are grouped
in order to make routine service quick and easy.
Color-Coded and Numbered Electrical Wiring. Troubleshooting
is efficient and simplified with the color-coded and numbered
wiring.
Serviceability Features That You’ve Come to Expect
Simplified service means more time spent paving and less time spent on maintenance.
Optional Equipment
Caterpillar offers many options that allow the paver and screed to be configured to your
specific application. Contact your dealer for more details.
AP655D Asphalt Paver specifications
Tractor Options
Auger and Mainframe Extensions
Auxiliary Power Panel
CE Certificate
Decelerator Pedals
Ecological Washdown System
Folding Operator’s Station Canopy
Generator (Belt or Hydraulic Driven)
Italian/German Road Homologation
Lights (High Intensity Discharge and
Halogen)
Power Folding Hopper Apron
Proportional Paddle Sensor
Sonic Feeder Sensors
Steering Guide
Uptime Kit
Ventilation System
Warning Beacon
Controls and Grade References
Automatic Grade and Slope Control
Non-Contacting Sonic Grade Sensor
Contacting Grade Sensor
Outboard Leveler, 9.15 m and 12.2 m
Inboard Leveler
Sonic Averaging Beam
Rigid Ski, 9.15 m and 12.2 m
Screed Options
Extensions for: 5.5 m – 6.5 m –
7 m – 8 m
Foldable End Gates
Power Crown Adjuster
Tamper, Vibrator and Counterbalance
Display Control
Page 10
10
AP655D Asphalt Paver specifications
Engine
Six cylinder Caterpillar C6.6 with
ACERT™ Technology, turbocharged
air-to-air after-cooled diesel engine.
Meets European EU Stage IIIA engine
emission regulations.
Gross Power 2200 rpm
SAE J1995 129.5 kW/174 hp
Net Power 2200 rpm
ISO 9249 121.9 kW/163.5 hp
EEC 80/1269 121.9 kW/163.5 hp
Bore 105 mm
Stroke 127 mm
Displacement 6.6 liters
All engine horsepowers are metric
including front cover.
Net power ratings are tested at the
reference conditions for the specified
standard.
Net power advertised is the power
available at the flywheel when the
engine is equipped with alternator,
air cleaner, muffler and fan.
Derating is not required up to an
altitude of 3000 m.
Suspension
The high-speed Mobil-trac™
undercarriage consists of a durable,
high-strength rubber belt with a thick
outer cover that includes five internal
layers of flexible steel cable. The track
is 3023 mm long and 457 mm wide.
Drive traction is provided by a
hydraulic tensioning cylinder with
accumulator that maintains friction
between the belt and the drive wheels.
Rubber-coated steel mid-wheels
provide smooth ride and high traction
efficiency by distributing weight over
the entire length of the belt.
The steel track undercarriage consists
of four 241 mm diameter track rollers,
a special rear, four roller 152 mm
diameter bogey, and two 152 mm
diameter single roller return idlers per
side. Rollers are bogied in pairs and
each pair is articulated for optimum
leveling capability. Rollers ride on
Caterpillar
®
D3 track rails. Track rails
are sealed, lubricated and include a split
master link for quick track removal and
installation. Track tensioning is
provided by a parallel link swing arm
design that provides constant hydraulic
pressure. Track tension is maintained
without manual adjustment. Recoil
forces are controlled by check and
relief valves.
Track Base
MTS undercarriage 3020 mm
Steel Track undercarriage 3060 mm
Transmission
The Mobil-trac™ drive system utilizes
two dual path hydrostatic pumps and
two fixed displacement motors.
The pumps are infinitely variable with
electronic displacement controls (EDC)
for steering and speed. Single speed
motors drive two speed planetary gear
boxes to provide two propel ranges.
The drive system is equipped with two
switches located at the operator’s
station control console. The two
switches are used as manual overrides
and are directly linked to EDC’s.
The steel track drive system utilizes
two dual path hydrostatic pumps and
two variable displacement motors.
The pumps are infinitely variable with
electronic displacement controls (EDC)
for steering and speed. The two speed
motors drive single speed planetary
gear boxes to provide two propel
ranges. The drive system is equipped
with two switches located at the
operator’s station control console.
The two switches are used as manual
overrides and are directly linked to
EDC’s.
Speeds (forward and reverse)
Paving
Mobil-trac 0-25 mpm
Steel Track 0-25 mpm
Travel
Mobil-trac 14.8 km/h
Steel Track 5.3 km/h
Brakes
Primary Brake Features
A closed-loop hydrostatic system
provides dynamic braking during
normal operation.
Parking Brake Features
Safety and parking brakes system
includes a spring applied,
hydraulically released brake which is
actuated by a switch on the operator’s
station control console.
Steering
Hydraulic power assist steering system
provides smooth, low effort steering by
means of a steering wheel. Electric over
hydraulic dual path differential steering
assures precise machine control.
Steering commands are independent of
propel speed.
Three steering modes including pave,
travel and maneuver are selectable at
the operator’s control console.
Electrical System
The 24-volt DC electrical system is
designed for improved durability,
reliability and ease of service. Two
12-volt batteries with 1400 cranking
amps each and a 80-amp alternator are
used in the system. Wires are loomed
with vinyl-coated nylon braid to
improve the overall integrity of the
electrical system and to protect against
abrasion.
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11
AP655D Asphalt Paver specifications
Dimensions
B
G
J
A
I
C
F
H
K
D
mm
A Tractor length with push roller 4950
B Length with push roller and screed 6160
C Transport width with screed end gates
(hopper raised) 2720
Transport width without screed end gates
(hopper raised) 2500
D Tractor operating width (hopper lowered) 3306
E Track gauge width 2200
F Operating height with canopy 3840
G Transport height with canopy, fumes stack
and seat lowered 2920
mm
H Truck dump height (at hoppers)
MTS undercarriage 605
Steel Track undercarriage 593
I Truck entry width (at hoppers) 3200
J Hopper length 1960
K Push roller height 533
L Clearance 260
Hopper capacity (with conveyor tunnels) – m
3
6.5
Discharge height at center
MTS undercarriage 577
Steel Track undercarriage 566
Augers diameter 406
Service Refill Capacities
Liters
Fuel tank 290
Cooling system (total) 30
Engine oil w/filter 14
Hydraulic oil tank 218
Washdown spray system 38
Weights
Operating Weights* kg
MTS/Steel Track undercarriage 19 165
Shipping Weights**
Tractor only 15 050
Tractor with screed 18 890
Weights shown are approximate and include:
* 75 kg operator, with canopy, fuel tank 50%, leveling system, standard
width screed (2.55-5 m).
** base machine, canopy lowered, fuel tank 10%, manual apron, standard
screed end gates.
L
E
AP655D
Page 12
®
HEHG3611 (03/2007) hr
AP655D Asphalt Paver
For more complete information on Cat products, dealer services, and industry solutions, visit us on the web at
www.cat.com
Materials and specifications are subject to change without notice. Featured machines in photos
may include additional equipment. See your Caterpillar dealer for available options.
© 2007 Caterpillar -- All rights reserved
CAT, CATERPILLAR, their respective logos, “Caterpillar Yellow” and the POWEREDGE trade dress as well as
corporate and product identity used herein, are trademarks of Caterpillar and may not be used without permission.
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