TM-9-2520-234-35 Technical Manual for M109 Transmission XTG-411-2A Download

PAR 38-39 OPERATION OF HYDRAULIC SYSTEMS CHAP 2, SEC IV relay valve, where it is sent to the right-gear- ed steer clutch, through the geared steer coolant line. (5) The right-geared steer clutch is ex- hausted, after use, through the ball check valve (upper) located between the steer feed and steer coolant feed lines. (6) In right steer in third gear, the right-drive clutch (output clutch) is released, the right-geared steer clutch is engaged and supplied with coolant, and the left-drive clutch (output clutch) is engaged and continues to drive. b. Fourth Gear, Full-left Steer (fig. 16) Note. Refer to par. 56 and fig. 32 for the torque path through the power train. (1) The hydraulic system will function in fourth gear steer in the same manner as described for fourth gear straight travel in par. 34, above, except for the position of the steer valves and the flow of oil to the drive clutches and steer clutches. (2) In left steer, the steer control shaft is rotated counterclockwise. This rotation moves the right-steer valve upward while the left-steer valve moves downward. Flow to the left-drive clutch (output clutch) is blocked. A regulated steer feed pressure is sent to the steer relay valve. The steer relay valve sends oil to the left-geared steer clutch, through the left-geared steer clutch apply line. (3) The flow to the right-drive clutch (output clutch) is not interrupted and the clutch continues to drive the right output. The right- steer valve supplies steer coolant feed to left- geared steer clutch. The left-geared steer clutch apply pressure can exhaust through the lower check valve (between steer feed and steer coolant feed lines) and the geared steer coolant line, when application of steer is dis- continued. 39. HYDRAULIC SYSTEM FUNCTION - REVERSE RANGE, STEER a. Reverse 1 Gear, Full-right Steer — (fig. 17) Note. Refer to par. 57 and fig. 33 for the torque path through the power train. (1) The hydraulic system will function in reverse 1-gear steer in the same manner as described for reverse l-gear straight travel in par. 35, above, except for the position of the steer valves and the flow of oil to the drive clutches and brakes. (2) Refer to par. 37a(2) through (5), above, for an explanation of the function of the steer valves and oil flow to the drive clutches and brakes. (3) In reverse 1 gear, right steer, the right-drive clutch (geared steer clutch) is re- leased, the right brake is applied and supplied with coolant, and the left-drive clutch (geared steer clutch) continues to drive the left-output. b. Reverse 2 Gear, Full-left Steer — (fig. 18) Note. Refer to par. 58 and fig. 34 for the torque path through the power train. (1) The hydraulic system will functioning reverse 2-gear steer in the same manner as described for reverse 2-gear straight travel in par. 36, above, except for the position of the steer valves and oil flow to the drive clutches (output clutches) and geared steer clutches. (2) Refer to par. 38b(2) and (3), above, for an explanation of the function of the steer valves and oil flow to the drive clutches and geared steer clutches. (3) In reverse 2 gear, left steer, the left-drive clutch (output clutch) is released, the left-geared steer clutch is applied and sup- plied with coolant, and the right-drive clutch continues to drive the right output. 43