TM-9-2520-234-35 Technical Manual for M109 Transmission XTG-411-2A Download
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CHAP 5, SEC III INPUT PRESSURE, SCAVENGE OIL PUMP REBUILD PAR Section Ill, INPUT PRESSURE AND SCAVENGE OIL PUMP ASSEMBLY—REBUILD 77. DESCRIPTION Refer to par. 10 for description of the in- put pressure and scavenge oil pump assembly. 78. DISASSEMBLY (fig. 373, fold-out 2) a. Using a 9/16-inch wrench, remove four self-locking bolts 52 from pump assem- bly 45. b. Remove scavenge oil pump body 47, gears 55 and 56 and Woodruff key 51. c. Do not remove the two needle bear- ings 53 and 54 from scavenge pump body 47 unless replacement is necessary. Remove bearings with an expanding slide hammer re- mover tool. If such a tool is not available, the bearings will have to be cut out with a burr gun. d. Remove pump separator plate assem- bly 48. e. Remove pressure pump drive gear 57 and idler gear 58 from pump body 61. f. Do not remove the two needle bearings 59 and 60 from the pressure pump body 61 unless replacement is necessary. Remove bearings with an expanding slide hammer re- mover tool. Refer to c , above. g. Do not remove the two dowel pins 49 from the pump separator plate 50 unless re- placement is necessary. If necessary, re- move the dowels. 79. CLEANING Refer to par. 71 for cleaning recommen- dations. 80. INSPECTION AND REPAIR Refer to par. 72 for general inspection 77-8 and repair recommendations. Repair and re- build points of measurement for fits, clear- ances and wear limits are indicated by small, lower case letters in fig, 373, fold-out 2. Refer to par. 236 for wear limits information. 81. ASSEMBLY (fig. 373, fold-out 2) a. If the two dowel pins 49 were removed from–pump separator plate 50, press in new pins, leaving one end of each within 0.420 inch of the plate surface. b. If the two needle bearings 59 and 60 were removed from pressure pump body 61, install new replacements. Press the bearing, against the numbered side of the bearing cage, 0.060 to 0.100 inch below the surface adjacent to the bearing bore. c. If the two needle bearings 53 and 54 were removed from scavenge pump body 47, install new replacements. Press the bearing, against the numbered side of the bearing cage and from the inside of the body, 0.010 to 0.040 inch below the surface adjacent to the bearing bore. d. Install input pressure pump drive gear 57 and idler gear 58 into input pressure pump body 61. e. Install pump separator plate assem- bly 48. f. Install Woodruff key 51 onto input pres- sure pump drive gear 57. g. Install scavenge pump gears 55 and 56 onto input pump drive gear 57 and idler gear 58. h. Install scavenge pump body assembly 47 and secure with four 3/8-16 x 2-1/4 self- locking bolts 52. Torque the bolts to 36-43 pound-feet. After assembly, the pump should rotate freely. 104