TM-9-2520-234-35 Technical Manual for M109 Transmission XTG-411-2A Download
Page 88 of 323
CHAP 2, SEC V TORQUE PATHS PAR 55 55. Figure 31. Third-gear, full-right-steer torque path, converter operation TORQUE PATH - - THIRD GEAR, FULL-RIGHT STEER, CONVERTER OPERATION (fig. 31) a. Torque is transmitted to the steer planetary ring gears in the same manner as described in par. 49a and b , above. From this point, to the power train outputs, the torque paths for the right and left sides are different. b. The geared steer method is used for third-gear steer. In this method, steering results when the geared steer clutch is en- gaged at one side while the drive clutch (out- put clutch) is applied at the opposite side. The vehicle steers toward the side on which the geared steer clutch is engaged. c. In right steer, in third gear, the right- geared steer clutch is applied while the right- output clutch is released. The drive clutch on the left side is still engaged and continues to drive. Hydraulic action, controlled by the steer control valve, releases the drive clutch and applies the geared steer clutch. An op- posite movement of the steer control valve will release the left-output clutch, engage the left- geared steer clutch, and result in left steer. d. In full steer, the applied geared steer clutch locks the geared steer planetary sun gear and slows the geared steer planetary carrier. In partial steer, the geared steer clutch is only partially applied and slows the output to a lesser degree. The degree of steer is controlled by the degree of movement of the steer control. Refer to TABULATED DATA, par. 7, for the gear ratios applicable to third gear, right steer. 58