Milton CAT 770 - Manual (Page 6)

Mechanical Power Train. The Cat
mechanical drive power train and power
shift transmission provides unmatched
operating efficiency and control on steep
grades, in poor underfoot conditions, and
on haul roads with high rolling resistance.
Transmission. Pairing the Caterpillar
seven-speed planetary power shift
transmission with the C15 diesel engine
with ACERT Technology delivers
constant power over a wide range
of operating speeds.
• Transmission Chassis Control (TCC).
Transmission shifting is based on
Transmission Output Speed for optimum
performance efficiency and clutch life.
The TCC provides integrated functionality
to controlled throttle shifting, directional
shift management, neutral coast inhibitor,
body-up shift limiter and body-up
reverse neutralizer.
Throttle Lock. The operator can now
electronically lock the throttle pedal
at full throttle, to reduce fatigue on long
uphill hauls. The throttle can be locked
on by momentarily depressing the throttle
lock switch located on the operator
console, while depressing the pedal
fully. The throttle is released whenever
braking is applied or the throttle is again
depressed.
Lock-Up Torque Converter.
Combines maximum rimpull and
cushioned shifting of torque converter
drive with the efficiency and performance
of direct drive. The torque converter
includes an additional clutch plate to
maintain power train capability for
higher horsepower and top speed, as
well as a new torque converter adapter
that provides extra length to house the
additional clutch plate and enables the
converter components to be changed
without having to change the housing.
The lock-up torque converter engages
at approximately 8 km/h (5 mph),
delivering more power to the wheels.
Lock-Up Clutch. Quickly releases and
re-engages to reduce power train torque
loads for smoother shifting, long life
and a more comfortable ride.
New Differential and Proven Final Drives.
The new Cat differential works with
the proven final drives as a system to
deliver maximum power to the ground.
For improved serviceability, the pinion
gear is cantilever mounted, which allows
inspection of the differential without
pulling the rear-end. Visual inspection
of the pinion gear and bearings can be
performed in 1-2 hours versus 8 hours
on the previous models. In addition,
the differential bevel pinion gear set
is designed for improved adjustability,
which results in improved contact patterns
and life. The differential gear set also
provides enhanced bending life for
steeper grade applications.
New Differential Center Housing. A new,
ductile iron center housing improves
quality and reliability. The improved
stiffness allows for better main support
bearing life. The new housing also uses
bolts, reducing maintenance time.
This change also improves wheel
station bolted-joint life.
6
Cat power train delivers more to the ground for greater productivity and lower operating costs.
Power Train – Transmission