Transmission. Electronically controlled
Caterpillar planetary powershift
transmission with eight forward and
one reverse speed. Tractor gears 1 & 2
operate in converter drive for increased
torque capability during cut and fill
operations. Gears 3-8 operate in
direct-drive for drive train efficiency
during the haul. Reverse gear operates
in converter drive. All scraper gears
operate in converter drive for increased
torque capability during the cut and fill.
Planetary Design. Provides larger
contact area between gears than
countershaft transmissions for
greater load-carrying capacity.
Neutral Coast Inhibitor. Neutral coast
inhibitor prevents the transmission
from shifting into neutral if the operator
selects neutral while moving, as well
as maintaining the flow of the
transmission fluid.
Transmission Hold. Allows the operator
to maintain converter drive for increased
rimpull, or hold the current gear for
enhanced control.
Programmable Top Gear Selection.
Allows the operator to manually set the
top gear (3rd-8th) available to match
conditions or the hauling speed of the
fleet to specific job-site needs.
Retarder. The hydraulic retarder acts as
an internal brake on the driveline that
minimizes the need to apply service
brakes. By engaging the retarder 3 to
4 seconds before the machine traverses
a downhill grade, the operator can reduce
wear on the service brakes and enhance
machine control.
Differential Control. Electronic differential
lock on the tractor helps prevent the
drive wheels from spinning in poor
underfoot conditions. The operator
engages the differential lock by choosing
either the right or left foot control
located on the floor of the cab.
Brake Performance. Redesigned axles
on both the tractor and scraper
accommodate wider brake shoes
and brake drums, improving brake
performance as much as 20 percent and
reducing brake and drum wear as much
as 75 percent.
Independent Systems. Expanding-shoe
type brakes are a cam-operated design
that is air-applied and spring released.
The braking system uses independent
front and rear circuits, with the secondary
brakes automatically applied if the
service air pressure drops to 55 psi
(380 kPa).
Parking Brakes. The push-button operated
parking brake features a spring-applied,
air-released mechanism that operates
the service brakes. Meet the ISO 3450:
1998 standard.
Final Drives. Outboard-mounted, planetary
design final drives reduce torque loads
on other power train components.
Large-capacity, double-row roller
bearings and Caterpillar Duo-Cone
seals deliver exceptional reliability
in the toughest applications.
6
Power Train – Transmission
Integrated electronics allows the machine to monitor the power train which reduces stress as
well as provide a better ride to the operator.
(77 paginas)
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