TM 9--2520--215--34
0005 00--27
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.
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
transmission output. The clockwise rotation of the right sun gear causes an increase in the speed of the right trans-
mission 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.
tending to remain stationary due to inertia. This damps out any tendency of the output sun gears to oscillate
during straight travel. During steer, the flywheel rotates and its inertia smoothes out the application or release of
steer. Jerking and violent transition to or from the steer condition is prevented
Refer to this work package for the gear ratios involved in high--range steer.
LOCKUP CLUTCH APPLIED
LEFT---STEER
CLUTCH APPLIED
SLOWER ROTATION
FASTER ROTATION
HIGH---RANGE
CLUTCH APPLIED
Torque Path in High---Range, Lockup Drive, Left Steer---Schematic
DIRECTION OF TRAVEL
