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

PAR 8-9 CHAPTER 2 DESCRIPTION AND OPERATION Section I. DESCRIPTION AND OPERATION OF INPUT TRANSFER ASSEMBLY 8. INPUT TRANSFER GEARING a. Input Transfer Gearing — Components (fig. 373, fold-out 2) (1) A cast aluminum transfer housing 126 encloses and supports the transfer gearing. A cast aluminum flange adapter 19 connects the vehicle engine flywheel housing to the transfer gear hous- ing. The rear of transfer housing 126 is bolted to the torque converter housing. (2) A splined engine coupling shaft 23 delivers engine torque to the gear train. The gear train consists of a 68-tooth drive gear 25, a 52-tooth idler cluster gear 34, a 34- and 54-tooth cluster gear 41, and a 66-tooth converter pump cover drive gear 67. These gears have 6-pitch teeth. The drive gear is supported in housing 126 and adapter 19 by single-row ball bearings 24 and 27. Idler gear 34 is supported on a spindle 5 by a double-row ball bearing 35. Idler cluster gear 41 is supported on spindle 153 by two straight roller bearings 38 and 40. Converter pumpcover drive gear 67 is bolted to converter cover assembly 68. Idler gear 34 includes a 36-tooth oil pump drive gear. The 29-tooth oil pump driven gear 109 is supported by a single-row ball bearing 110. b. to the splined Operation of Input Transfer Gearing (fig. 20) (1) Engine rotation is transmitted 68-tooth transfer drive gear by a coupling shaft. The drive gear drives the 52-tooth gear which, in turn, meshes with the 34-tooth gear on the cluster idler gear. The 54-tooth gear on the cluster idler gear drives the 66-tooth converter pump cover drive gear. (2) The converter cover is thus driven in a direction opposite to that of the engine and at a speed 1.64 times greater than engine speed. Rotation of the converter is clockwise, viewed from the left side of the power train. The oil pump driven gear is driven counterclock- wise at 1.62 times engine speed. 9. TORQUE CONVERTER AND LOCKUP CLUTCH a. Torque Converter Components — (fig. 373, fold-out 2) (1) The torque converter consists mainly of three cast aluminum elements: pump assembly 82, stator assembly 94 and turbine assembly 79. These, and related minor components, are enclosed and sup- ported by the input transfer housing 126 and converter housing 31 (fig. 374, fold- out 3). (2) Pump assembly 82 (fig. 373, fold-out 2) has radial vanes cast into one side surface. It is machined at the center and bolted to a steel hub 88. The hub is supported by a single-row ball bearing 91 which, in turn, is mounted on a stationary ground sleeve 26 (fig. 374, fold-out 3). The ground sleeve is rigidly mounted in converter housing 31. The outside diam- eter of pump assembly 82 (fig. 373, fold- out 2) is bolted to converter cover assem- bly 68. (3) The stator assembly is a vaned reaction member. It includes stator 94, freewheel race 101, freewheel bearings 97, springs 98, cam 99 and various minor components. This assembly mounts on the splined outside diameter of the ground sleeve 26 (fig. 374, fold-out 3). The stator can freewheel in the direction of conver- ter rotation but will lock up if an attempt is made to rotate it in the opposite direc- tion. (4) Turbine assembly 79 (fig. 373, fold-out 2) is a vaned casting similar to pump assembly 82. It is riveted to a steel hub which has internal splines which en- gage turbine shaft 2 (fig. 375, fold-out 4). A single-row ball bearing 73 (fig. 373, 11