TM-9-2520-234-35 Technical Manual for M109 Transmission XTG-411-2A Download
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CHAP 2, SEC V TORQUE PATHS PAR 53 Figure 29. First-gear, full-right-steer torque path, converter operation 53. TORQUE PATH - - FIRST GEAR, FULL-RIGHT STEER, CONVERTER OPERATION (fig. 29) a. Torque is transmitted to the steer planetary ring gears in the same manner as that for first gear, as described in par. 47a and b, above. From this point, to the power train outputs, the torque paths for the right and left sides are different. b. The clutch-brake method is used for first-gear steer. Steering results when the brake is applied at one side while the drive clutch is engaged at the opposite side. The drive clutch is the geared steer clutch. The vehicle steers toward the braked side. c. In right steer, in first gear, the right 56 brake is applied while the right-drive clutch is released. The drive clutch on the left side is still engaged and continues to drive. Hy- draulic action, controlled by the steer control valve, releases the drive clutch and applies the brake. An opposite movement of the steer control valve will release the left-geared steer clutch (the drive clutch), apply the left brake, and result in left steer. d. In full steer, the applied brake locks the steer planetary carrier and rotation stops at that side. In partial steer, the applied brake only slows the side toward which the turn is made. The degree of steer is con- trolled by the degree of movement of the steer control. Refer to TABULATED DATA, par. 7, for the gear ratios which apply to first gear, full-right steer.