10 z 8 7 b 5 4 3 2 1 Fig 7E 40 Rear Pump and Reverse Piston Exploded View 1 Spring Retainer Snap Ring 6 Reverse Piston Outer Seal 2 Spring Retainer 7 Rear Pump Body Bushing 3 Reverse Piston Inner Seal 8 Rear Pump Body 4 Reverse Piston Return 9 Rear Pump Drive Gear Springs 17 Used 10 Rear Pump Driven Gear 5 Reverse Piston Inspection 1 Wash all parts in clean solvent and dry with compressed air 2 Check fit of rear pump drive and driven gears as described earlier in this section under Front Pump Overhaul Fits and tolerances of the rear pump gears are identical to those of the front pump 3 Inspect pump body for leaks and scoring Check hub of pump body for smoothness Any burrs on this surface would cause leakage and could result in a jammed reverse piston J 5133 J 7782 Fig 7E 41 Removing Reverse Piston Return Spring Retainer with J 5133 and J 7782 Y s a y m k Fig 7E 42 Installing Rear Pump Body Bushing with J 8360 4 and Handle J 70T9 2 4 Check for broken piston return springs and make a comparative check of spring heights by standing all of the springs in a row If appreciable variance in spring height is noticed replace springs 5 Check condition of rear pump body bushing If scored or worn replace Rear Pump Body Bushing Replacement 1 Remove old bushing with a chisel or suitable tool using care not to damage pump body bore 2 Install new bushing as illustrated in Figure 7E 42 using J 8860 4 Assembly NOTE All number references in this procedure are to Figure 7E 40 1 Install piston inner seal 3 in reverse piston 5 2 Install piston outer seal 6 in piston 5 3 Install reverse piston 5 on rear pump body 8 It is not necessary to fill snap ring groove on pump body hub for installation of piston Pitch of groove for snap ring 1 is favorable for installation 4 Position 17 return springs 4 in their seats on the reverse piston 5 then place spring retainer on springs 5 Place unit in a press with wood or other soft material between the press bed and the rear pump body 8 place snap ring 1 on hub of rear pump