TM-9-2520-254-34 Direct Support for M113 TX100-1 Transmission 2520-00-066-4240 Download
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Section III. TORQUE PATHS THROUGH TRANSMISSION 2-22. Torque Path—Neutral (fig. 2-11) a. In neutral, drive from the vehicle engine to the Transmission range gearing is always through the oil in the torque converter. Lockup cannot occur in neutral. The converter turbine drives the turbine shaft and the components which are attached to it. b. The components attached to the turbine shaft include the high-range clutch housing, in- termediate-range planetary sun gear, and the low- range planetary sun gear. The power take-off drive gear, being integral with the high-range clutch housing, is driven and can drive the power takeoff, if the transmission is so equipped. c. No clutches are engaged. Thus, no drive, except that to a power takeoff, extends beyond the turbine shaft. The torque multiplication capabilities and hydraulic drive characteristics of the torque converter are available to drive the power takeoff. 2-23. Torque Path—Low Range (fig. 2-12) a. Lockup operation (direct drive through the torque converter) is shown in figure 2-12. However, converter operation is equally applicable and is always in effect until turbine shaft speed (and front governor speed) is sufficient to cause lockup. Thus, the vehicle always starts in converter operation regardless of the selector position used. b. In low range (first gear), the low-range clutch is engaged. This holds the low-range planetary ring gear stationary. The low-range planetary sun gear drives the pinions of the low-range planetary carrier. The pinions must rotate within the stationary ring gear. Their rotation within the ring gear causes the low-range carrier to rotate in the same direction as the turbine shaft but at reduced speed. The carrier, integral with the transmission output shaft, drives the output shaft. 2-27