f. The Combining Planetaries.
The combining planetaries (fig.
1-7) combine the output from the range planetary and the hydrostatic
steer unit to provide the transmission output to the final drives.
The range pack output connects to the combining planetary ring gear,
and the hydrostatic steer unit output connects to the combining
planetary sun gear, which makes the combining planetary carriers the
output.
g. Power Takeoff. The transmission provides three engine driven
power takeoffs, at different locations.
The input module provides
two power takeoffs and the center module provides one.
h. Shift Control. Shift control starts at the driver's controls,
where the selection of the automatic ranges sends an electrical
signal to the transmission solenoids. The activated solenoids place
the transmission in the range selected. The converter turbine speed
controls the automatic converter-to-lockup shifts.
When the driver places the transmission control in the drive
position, the transmission output speed actuates all range shifts.
The gas turbine engine interstage pressure modulates the shift points
to provide the desired performance for all load conditions.
The
control system of this transmission provides complete logic for the
following modes of operation:
Park/Neutral.
Use this mode for starting or idling the
engine. No clutch engagement takes place in this mode.
Pivot Steer.
This mode provides tight maneuvering
capability (the transmission remains in neutral).
Drive (2 - 4). Under normal conditions, use this range for
forward movement. Automatic shifting from second to third,
and third to fourth occurs in this mode.
Low (1 - 4). Use this range for close maneuvering and in
situations requiring high traction moving forward. In this
range, automatic shifting from first to second, to third,
to fourth occurs, but at a higher speed than in the
"Drive."
Reverse (1 - 2). Automatic shifting in this range provides
close maneuvering and high traction in R-1 and high speed
reverse capabilities in R-2.
To avoid damage, the transmission prevents shifts from forward to
reverse or reverse to forward above the speed from 3 to 5 mph.
If
the electrical power to the transmission fails, the
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OD1710
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