TM   10-3930-638-24&P 3-24. STEERING SYSTEM MAINTENANCE (cont) c. Hydraulic Pump Repair (cont). STEP LOCATION ITEM ACTION REMARKS DISASSEMBLY 1 Hydraulic a.  Hydraulic  pump Position and In vise, with drive shaft (6) facing up pump clamp b. Back plate (4), body Match mark Use center punch and hammer (5) and front plate (3) c. Eight cap screws (2) Loosen  and remove d. Hydraulic pump Remove From vise CAUTION Do not attempt to pry front plate and back plate apart. Prying sections apart will damage machined surfaces. e. Front plate (3) and Separate Holding pump in both hands, bump drive back plate (4) shaft (6) against a wooden block to separate front and back plate f. Drive shaft (6) and Remove Pull from bushing (25) in front plate (3) idler shaft (7) or back plate (4) g. Body (5) Remove Place drive shaft (6) in bushing (25) of section attached to body (5). Lightly tap drive shaft (6) with plastic hammer until body separates from front plate (3) or back plate (4) 2 Back Remove  and Pull from groove plate  (4) discard Remove  and Pull from machined surface discard 3 Front Remove  and Pull  from  groove plate  (3) discard CAUTION in the following step, be careful not to scratch or damage machined surface of front plate (3). b. Diaphragm (10) Remove  and Slip a sharp instrument under diaphragm discard and pry loose from front plate (3) c. Two springs (11) and Remove  and steel  balls  (12) discard d. Back-up gasket (13) Remove  and protector  gasket discard (14) and seal (15) a. O-ring (8) b. Thrust plate (9) a. O-ring (8) 3-180   CHANGE 2