CAT Articulated Truck 725 User Manual
Engine
Engine Model Cat®C11 ACERT™
Gross Power – SAE J1995 230 kW 309 hp
Net Power – SAE J1349 225 kW 301 hp
Weights
Rated Payload 23.6 tonnes 26 tons
Body Capacities
Heaped SAE 2:1 14.3 m
3
18.8 yd
3
725
Articulated Truck
®
®
2
725 Articulated Truck
The 725 Caterpillar®Articulated Truck is a world-leading earthmoving solution.
The 725 offers proven reliability and
durability, high performance, low fuel
consumption, operator comfort and
low operating costs.
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. 11
Serviceability
Long service intervals and easy
maintenance provide better machine
availability, resulting in lower owning
and operating costs. pg. 10
Performance and Productivity –
Suspension and Traction Control
Three-point front suspension provides
a smooth ride, allowing the operator
to travel at speed over rough terrain.
Cross-axle differential locking system
provides full driveline locking for
maximum performance in adverse
conditions. pg. 6
Performance and Productivity –
Power Train
The Cat C11 ACERT engine, matched
with the six-speed electronic controlled
transmission and a powerful retarder,
delivers the performance needed to
get the job done. pg. 5
✔
Cat®C11 Engine with ACERT Technology
The core concept behind ACERT
technology is advanced combustion.
ACERT engine technology carefully
controls the combustion process to reduce
pollutant levels while maintaining
performance and efficiency. pg. 4
✔
✔ New Feature
3
Durability and Reliability
The 725 has built-in durability and
reliability. Cat purpose-built, articulated
truck drivetrain components, front frame
and hitch ensure maximum performance
in the toughest applications. pg. 9
Ease of Operation
Ergonomically designed wrap-around
dash, tilt and telescopic steering wheel,
easy-to-reach controls and outstanding
all-around viewing promote fast,
confident machine operation. pg. 8
✔
Operator Comfort
Large center-mounted cab, oscillating
front axle, air suspension seat, full-size
trainer seat and large storage space
provide exceptional operator comfort.
pg. 7
✔
ACERT Technology. The C11 ACERT
engine introduces a series of evolutionary,
incremental improvements that provide
breakthrough engine technology built
on systems and components developed
by Caterpillar with proven reliability.
The technology capitalizes on Caterpillar
expertise in four core engine systems:
fuel, air, electronics and after treatment.
ACERT technology is a unique and
revolutionary systems solution that
enables Cat engines to meet today’s
clean air regulations, thus establishing
the building blocks for attaining
tomorrow’s more stringent standards.
C11 Block. The one-piece, gray iron
block features generous ribbing for
stiffness and heavy bearing bulkheads
for rigidity and strength as the crankshaft
turns. Straight O-ring connection points
reduce the loss of engine oil and fluids.
Cylinder Head and Piston Technology.
The C11 has a cross-flow cylinder head
with refined port geometry, which
improves breathing and provides better
combustion. The Monotherm/steel
pistons have a forged steel design, which
offers high strength, light weight and
tighter tolerances. The result is better
oil control, minimal blow-by and long
liner life.
Advanced Diesel Engine Management
(ADEM) A4 Engine Controller.
The ADEM A4 electronic control
module manages fuel delivery to get
the best performance per liter or gallon
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.
Fuel Delivery. 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.
Noise Reduction Technologies.
Noise reduction has been achieved
through design changes to the isolated
top cover, oil pan, multiple injection
strategy, insulated timing case cover,
sculpted crankcase and gear train
refinements.
4
Cat C11 Engine with ACERT Technology
A combination of proven systems and innovative new technologies, ACERT engines optimize
performance while meeting EPA Tier 3 and EU Stage 3a engine exhaust emission regulations.
Mechanically Actuated Electronic
Unit Injection (MEUI). A highly evolved
fuel system with a proven record of
reliability in the field. It combines the
technical advancement of an electronic
control system with the simplicity
of direct mechanically controlled unit
fuel injection. It excels in its ability
to control injection pressure over the
entire engine operating speed range.
These features allow the Cat C11 to
have complete control over injection
timing, duration and pressure.
Air-to-Air Aftercooling (ATAAC).
ATAAC keeps air intake temperatures
down and, in concert with the tight
tolerance combustion chamber
components, maximizes fuel efficiency
and minimizes emissions. Significant
improvements in airflow are generated
by a turbocharger, unique cross-flow
head and a single overhead camshaft.
Wastegate Turbocharging. Single
wastegate turbocharger provides higher
boost over a wide range, outstanding
low-end performance with improved
peak torque and enhanced engine
response.
Electronic Transmission. The Caterpillar
six-speed electronically controlled
transmission is designed specifically for
the articulated truck and its applications.
It features anti-hunt shift strategy for
speed continuity.
Electronic Clutch Pressure Control.
ECPC technology works with Controlled
Throttle Shifting to manage shift torque
and provide exceptional shift smoothness.
Controlled Throttle Shifting (CTS).
Significantly reduces power train stress
and clutch wear by controlling engine
speed, torque converter lock up and
transmission clutch engagements.
Engine Overspeed Inhibitor. Electronic
Transmission Control (ETC) protects
against engine overspeeding by shifting
the transmission up one gear at specified
rpm settings. If the transmission is in its
highest gear, torque converter lockup
disengages.
Directional Shift Management.
Regulates engine speed during directional
shifts to prevent damage caused by
high-speed directional changes.
Programmable Top Gear Selection.
Electronic Transmission Control lets
you electronically limit top gear selection
without the use of additional service
tooling or mechanical limiting of
the shift cane.
Retarder. Integral retarder with a
high power density design. Due to its
compact size, the unit quickly fills with
oil, providing more retarding power
and fast response times.
Usable Rimpull. Power train components
work together to offer more usable
rimpull at higher speeds on effective
grades. In first gear, the torque converter
overcomes grade resistance by sending
more torque to the wheels and preventing
engine lugging. On downhill grades,
the retarder acts like a brake by slowing
the machine.
Hydraulic Fan. The remote-mounted
hydraulic fan is temperature sensitive
providing variable speeds when needed,
which minimizes power requirements.
The result is more power to the ground
and faster cycle times.
5
Performance and Productivity – Power Train
Integrated power train with more power, greater performance and lower fuel consumption –
the power to do more work.
Front Suspension. The three-point front
suspension oscillates ±6° to provide
a smooth ride, allowing the 725 to
travel at speed over rough terrain and
softening impact loads on structures
and components.
A-Frame Construction. The front
suspension uses an oscillating A-frame
with a lateral tie rod to control axle
sideways movement.
Front Suspension Cylinders. Large bore,
low pressure cylinders are purpose
designed for tough applications and
offer a soft, smooth ride.
Mounting Points. Suspension mounting
points are integrated into the axle housing,
increasing reliability.
Rear Suspension. Features a walking
beam geometry with Caterpillar designed
rear suspension mounts which provide
a reliable and stable ride for excellent
load retention.
Traction Control. The traction control
system is comprised of a wet clutched
inter-axle differential and wet clutched
cross-axle differentials. All differentials
can be engaged and disengaged on-thego for maximum versatility. When used
together, the differentials provide
100 percent driveline locking.
Inter-axle Differential Lock. Locks all
three axles in unison and modifies
torque distribution for excellent traction
in poor underfoot conditions and on
grades. It is operated by a switch
located in the footrest.
Cross-axle Differential Locks.
Provides full driveline locking –
all three axles and all six wheels for
maximum performance in the most
adverse conditions. Acts in unison
with the inter-axle differential lock
when the footswitch is actuated and
the dash-mounted switch is selected.
Fast Hoist Cycle Times. Fast body raise
and lower times mean less time spent
in the dump area.
Load-Carrying Capacity. Large target
area provides high-load carrying
capacity. Its diverging flow design
gives clean load ejection, which
maximizes production and avoids
waste of material carry-back.
Exhaust Heat System. The body comes
exhaust heat ready.
Steering System. Cat articulated trucks
use a load-sensing steering system for
smooth, precise control. It features a
single, variable displacement pump.
Two double-acting, cushioned steer
cylinders allow the machine to articulate
45° to the left or right, permitting precise
positioning in tight areas. Its compact
Hand Metering Unit controls the
cylinders for responsive steering and
performance. An electronic secondary
steering system is standard.
Hydraulic Steering Cushioning System.
The 725 incorporates a hydraulic
cushioning system, resulting in smoother
and more responsive steering. It also
increases operator comfort and reduces
shock loads to the machine components.
6
Performance and Productivity – Suspension and Traction Control
Suspension systems and traction control – delivering power to the ground in all conditions.
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