CAT Articulated Truck 740 - Manual (Page 5)

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 C15 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 air flow 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 engine
response.
Electronic Transmission. The Caterpillar
seven-speed electronically controlled
transmission is designed specifically for
the articulated truck and its applications.
It features anti-hunt shift shift strategy
for speed continuity. It also incorporates
Individual Clutch Modulation (ICM)
to ensure constant shift times even
when the oil is cold.
Two Reverse Gears. The transmission
arrangement provides a second reverse
gear for improved performance when
operating in longer rear hauling
applications. First gear reverse is now
of a lower ratio for increased rimpull
on wet or steep grades.
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
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.
Caterpillar Engine Compression Brake.
Provides extra braking effort on downhill
grades. It is an excellent match for the
C15 ACERT engine, turning it into a
power absorbing air compressor. It has
very fast response time and produces
no additional heat, so it can be used
continuously.
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
engine compression brake works 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.