TM10-3930-660-34 7-4. TRANSMISSION ASSEMBLY - REPLACE/REPAIR (Cont’d) b. Lift transmission forward and to the side so it clears boom lift cylinders. 16. REMOVE PISTON PUMP (21) FROM TRANSMISSION. a. Support piston pump (21) and remove two hex head capscrews (22),  two lockwashers (23),   two flatwashers (24) and piston pump (21).   Discard lockwashers (23). b. Remove and discard O-ring (25) from hydraulic piston pump drive adapter. 17. REMOVE TANDEM GEAR PUMP (28) FROM TRANSMISSION. a. Remove two hex head capscrews (26),  two lockwashers (27) and tandem gear pump (28). Discard lockwashers (27). b. Remove and discard O-ring (29) from hydraulic gear pump drive. DISASSEMBLY 1. REMOVE TRANSMISSION CONTROL VALVE (44), PARA.  7-8. 2. REMOVE FRONT COVER ASSEMBLY (45), PARA.  7-5. NOTE All three clutch packs must be removed together because of gear meshing. 3. REMOVE CLUTCH PACKS (46-48). a. Install a special lifting tool in bottom groove of all three shafts. b. Attach a hoist with slings to special lifting tool and remove clutch packs (46-48). 7-13