TM-9-2520-215-34
CROSS-DRIVE TRANSMISSION ASSEMBLY
TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE
DECEMBER 2005
TM-9-2520-215-34 - Page 56 of 508
TM 9--2520--215--34
0005 00--28
THEORY OF OPERATION -- CONTINUED
0005 00
TORQUE PATHS THROUGH TRANSMISSION – Continued
Torque Path in High Range, Lockup Drive, Left Steer
NOTE
Refer to Torque Path in High Range, Lockup Drive, Left Steer and Hydraulic System, High
Range, Lockup Drive, Left Steer Schematic Views.
Refer to Torque Path in High Range, Lockup Drive, No Steer for the action of the high range gearing. Steer action in
high range is described in the following paragraphs.
In every steer condition, counterclockwise rotation is delivered to both right and left steer clutch drive gears. These
gears are driven by the train of gears including the steer bevel gear splined to the turbine shaft.
During left steer in high range, the left steer clutch is engaged. This causes the left steer planetary sun gear and left
tie steer clutch drive gear to rotate counterclockwise as does the left steer clutch drive gear. The right tie shaft drive
gear and right steer planetary sun gear are driven clockwise by the tie shaft and the tie shaft idler.
The counterclockwise rotation of the left steer planetary sun gear causes a reduction in the speed of the left transmis-
sion output. The clockwise rotation of the right sun gear causes an increase in the speed of the right transmission
output. Thus, the vehicle steers towards the side on which track is moving slower. In left steer, the right steer clutch
is released.
The steer flywheel is simply a stabilizer for the steering system. In straight travel, it is stationary and tends to remain
stationary due to inertia. This damps out any tendency of the output sun gears to oscillate during straight travel. Dur-
ing steer, the flywheel rotates and its inertia smoothes out the application or release of steer. Jerking and violent tran-
sition to or from the steer condition is prevented.
Refer to this work package for the gear ratios involved in high range steer.
Torque Path in High Range, Lockup Drive, Left Steer Schematic View
LOCKUP CLUTCH APPLIED
HIGH RANGE
CLUTCH APPLIED
LEFT STEER
CLUTCH APPLIED
SLOWER ROTATION
DIRECTION OF TRAVEL
FASTER ROTATION
07i214m
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