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

CHAP 2, SEC III DESCRIPTION AND OPERATION OF PAR 25-27 RIGHT- AND LEFT-OUTPUT DRIVE ASSEMBLIES b. Operation (2) Foreign matter in the oil col- . lects in the filter element. (1) Oil from the pressure pumps is directed through the oil filter element and then back into the system. Section III. DESCRIPTION AND OPERATION OF RIGHT- AND LEFT-OUTPUT DRIVE ASSEMBLIES 26. RIGHT-OUTPUT DRIVE ASSEMBLY a. Components (fig. 386, fold-out 15) (1) The right-output drive assem- bly includes shaft 39, carrier assembly 41, internal gear 23, output shaft assembly 1, bearings 12 and 17, seal assembly 5, re- tainer 10, housing assembly 14, saddle assembly 35 and saddle cap 28. (2) Shaft 39 is the driving mem- ber which connects the transmission left- output coupling to the right-output drive. It is splined at the transmission end and includes an integral 17-tooth sun gear at the opposite end. Planetary carrier assem- bly 41 includes carrier 43, three 37-tooth pinions 47 and three spindles 42. The pin- ions rotate on needle bearing rollers 46 on the spindles mounted in the carrier. The carrier is stationary and is the reaction member. (3) Internal gear 23 is the driven member and has 91 internal teeth. A splined hub on the ring gear meshes with the splined end of output drive shaft 4. Roller bearing 12 supports the outer end of the output shaft in housing assembly 14, while roller bearing 17 supports the inner end. Retainer 10 positions the bearing and houses oil seal 5. Ten studs are fitted in the outer flange of the output shaft, for attaching the track sprocket hub. (4) Housing assembly 14 houses and supports the output drive outer com- ponents. Saddle 37 houses and supports the output drive inner components and provides a mount for the rear of the trans- mission. The carrier assembly is anchored to the saddle assembly by 24 bolts 33. The housing assembly and saddle assembly are held together by three slotted machine screws 30. When mounted in the vehicle hull, 24 bolts pass through holes in both the housing and saddle to anchor the com- plete output drive assembly to the vehicle. (5) A hub on the transmission is positioned between the saddle and saddle cap 28. Seals are provided at this connec- tion to prevent leakage of oil. The output drive has its own oil supply. A plug 26 on the saddle cap is the oil filler plug. Plug 13 at the bottom of housing assembly 14 is the drain plug. Front and rear check plugs 15 are installed angularly from the drain plug. Lubrication within the output drive is the splash system. b. Operation (fig. 386, fold-out 15) — (1) The transmission left output is coupled to the splined end of shaft 39. Shaft 39 rotates within pinion assembly 47. The carrier is stationary, causing the pinions to rotate in a direction opposite to that of shaft 39. The pinions are in mesh with internal gear 23 which also must ro- tate in a direction opposite to that of shaft 39. The rotation of internal gear 23 is transmitted to output drive shaft 4 and, in turn, to the vehicle tracks. (2) The output drive thus reverses the direction of rotation available at the transmission output. Speed reduction with- in the output drive is 5.35:1. 27. LEFT-OUTPUT DRIVE ASSEMBLY a. Components (fig. 385, fold-out 14). The left-output drive components are identical to those of tine right-output drive except for shaft 16 and saddle 8. These components are longer in the left- output drive. b. Operation (fig. 385, fold-out 14). The operation of the left-output drive as- sembly is identical to the right assembly. 24 Change 2