Truck & Off-Highway Engineering - June 2022 - 8

TECHNICAL INNOVATIONS
POWERTRAIN
Allison toughens TerraTran off-highway transmission
Allison's TerraTran variant maintains the
same package size as the 4000 Series
transmission while offering increased
power, torque and GVW capability,
as well as fast reverse functionality.
proved productivity and optimized
efficiency, Ramanan said. Field tests
have demonstrated that TerraTran delivers
enhanced drivability, gradeability
and maneuverability under demanding
operating conditions.
Seamless vehicle integration was a
After more than two years of field testing
and development, Allison has
launched its new TerraTran off-highway
transmission designed to meet the
harsh operating conditions common in
mining and hauling applications.
Adapted from Allison's 4000 Series onhighway
transmission, this variant was
developed based on extensive voice-ofcustomer
input.
" We collaborated with several of our
OEM partners in the development of
the Allison TerraTran, " Kartik Ramanan,
executive director of Global OffHighway,
Customer Support and
Service Engineering, Allison
Transmission, shared with Truck & OffHighway
Engineering. " Voice-ofcustomer
input indicated a need for the
proven reliability and durability of the
4000 Series along with enhanced functionality
including increased horsepower,
torque and gross vehicle weight
(GVW) capability, and the addition of
fast reverse functionality. "
These enhancements were achieved
through a combination of new gear ratios,
power flow and improvements to
internal components including gearing
and bearings, Ramanan said. The
TerraTran delivers maximum power of
up to 800 hp (597 kW) depending on
the application in which it is deployed,
8 June 2022
TRUCK & OFF-HIGHWAY ENGINEERING
a significant increase from the 4000
Series transmission's 605-hp (450-kW)
rating. Maximum input torque ranges
from 1,950 to 2,360 lb-ft (2,644 to
3,200 Nm), which is also a significant
boost from the 4000 Series' rating of
1,850 lb-ft (2,508 Nm).
The transmission also features seven
forward and two reverse speeds. The
fast reverse capability delivers immajor
focus of the new variant's development
process. " When developing
this new propulsion system, one of our
goals was to simplify installation of the
TerraTran by maintaining 4000 Series
packaging, which is not a simple task
given that we were seeking to increase
power output and ruggedness as well
as add additional speeds including a
fast reverse, " Ramanan told TOHE.
" However, our terrific team of engineers
and innovators accomplished
just that. We maintained the overall
dimensions of the 4000 Series transmission
package to enable customers
to seamlessly integrate the new model
into existing vehicles. "
The first customer application for the
TerraTran, announced in July 2021, is
Xuzhou Construction Machinery Group's
(XCMG) all-terrain crane. The release of
TerraTran in the all-terrain crane is expected
to further enhance the differentiated
The first customer
application for the TerraTran
is Xuzhou Construction
Machinery Group's allterrain
crane.
FROM TOP: ALLISON TRANSMISSION; XCMG
Truck & Off-Highway Engineering - June 2022

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