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Loosely screw the tie rod locknuts (44) onto the tierods (52). Lubricate the o–ring (47) and the topthread of the connecting rod (53). TIghten the coupling nut (50) to attach the displacement pump to the motor. Insert the cotter pin (41). 15. Start the pump and run it slowly to check for binding. Adjust the tie rods as necessary , then torque thelocknuts (44) to 40–50 ft–lb (54–68 N.m). 16. Reconnect the fluid and air lines. Reconnect the ground wire if it was disconnected during service. Fig 2 50 53 45 42 20 21 52 26 SEE DETAIL A 19 34 SEE DETAIL B 38 SEE DETAIL C 3 30 36 28 31 32 11 28 *27 29 7 39 *15 4 33 41 8 TORQUE TO 60 ft–lb (82 N.m) 17* 44 TORQUE TO 40–50 ft–lb (54–68 N.m) 18 27* REF. NO. 2 DISPLACEMENT PUMP INCLUDES ITEMS 3–39, 56–66 66 DETAIL A 21 REF 26 REF LIPS OF V–PACKINGS MUST FACE DOWN 18 REF 64* THROAT GLAND/ PACKING STACKDETAIL B LIPS OF PACKING MUST FACE UP *56 *35 38 REF DETAIL C 11 REF 3 REF *65 INTAKE VALVE GLAND/ PACKING STACK LIPS OF V–PACKINGS MUST FACE UP 37 6 306–646 . Model 222–638 Displacement Pump (Used on Models 222–526, 222–539, 223–984and 223–991) NOTE: Before beginning, read “Before Y ou Start” on page 8. DisassemblyNOTE: Refer to Fig 3 and the parts drawing during thefollowing procedure. 1. Remove the cotter pin (41). Unscrew the couplingnut (50) and the three tie rod locknuts (44). Pull thedisplacement pump (2) off the air motor (1). 2. Remove the cotter pin (42). Loosen the locknut (45). Unscrew the connecting rod (53) from the displacement rod (60). 3. Insert a 1/4 in. (6 mm) diameter rod in the holes of the packing nut/wet–cup (21), and loosen it. Push thedisplacement rod (60) down until the priming piston (37) clears the intake valve housing (28). Removethe nut (6), priming piston (37), valve plate (36) and plate guide (31). 4. Unscrew the four tie bolts (8) and pull the intake valvehousing (28) off the pump. Pull the priming rod (62) and displacement rod (60) out of the bottom of thecylinder (59). Remove the pin (7) and unscrew thepriming rod (62) from the adapter (61). 5. Pull the cylinder (59) down out of the outlet housing(26). Inspect the inner surface of the cylinder and the outer surface of the displacement rod (18) forscratches or scoring, which can cause prematurepacking wear and leaking. To check, run a finger overthe surface or hold the part up to the light at an angle. 6. Disassemble the intake valve (3). Clean and inspectall parts, replacing as necessary . Check the intakevalve seat (30) for nicks or damage. 7. Unscrew the adapter (61) from the displacement rod (60). Remove and inspect the piston (38). Disassemble the piston. 8. Unscrew the packing nut/wet–cup (21). Remove thewiper seal (66). Remove the throat packings from theoutlet housing (26). 9. Clean and inspect all parts, replacing as necessary. ReassemblyNOTE: Refer to Fig 3 and the parts drawing during thefollowing procedure. 1. See Detail A of Fig 3. The gland/packing stack (64*) for the throat is preassembled. Do not disassemble the stack. Lubricate the gland/packing stack and install it into the outlet housing (26). Be sure the lips ofthe v–packings are facing down. Install the wiperseal (66) in the groove of the wet–cup (21) with the lipsfacing down. Loosely install the packing nut/wet– cup (21). 2. See Detail B of Fig 3. Install the two bearings (35*) and the u–cup packing (56*) on the piston (38). Be surethe lips of the packing are facing up. . 306–646 3. Install the piston (38), valve plate (34), and adapter (61) on the displacement rod (60). 4. Thread the connecting rod (62) into the adapter (61) and secure with the pin (7). 5. Install one copper gasket (27*) in the outlet housing(26). Push the displacement rod (60) and priming rod (62) up into the outlet housing (26) so the top of thedisplacement rod just protrudes from the packingnut/wet–cup (21). Lubricate the priming rod (62). 6. Install the cylinder (59) in the outlet housing (26), being careful not to scratch the polished inner surfaceof the cylinder. 7. See Detail C of Fig 3. Slide the intake valve gland/ packing stack (65*) into the intake valve seal housing(3). Do not disassemble the stack. Be sure the lipsofthe v–packings are facing up.Tighten the packing nut (11). Install the valve seat (30) in the intake valvehousing (28). Place the intake valve seal housing (3) on the seat (30). 8. Install two copper gaskets (27*) on the intake valve stop (29). Install the stop in the intake valve housing(28). 9. Carefully guide the intake valve housing (28) up overthe priming rod (62) and install it on the cylinder (59). Insert the four tie bolts (8) through the outlet housing (26) and engage the holes in the intake valve housing. Torque the tie bolts oppositely and evenly to 60ft–lb (82 N.m). 10. Install the plate guide (31), plate (36), priming piston (37) and nut (6) on the priming rod (62). If necessary, push down on the displacement rod (60) to providesufficient clearance from the intake valve housing(28). 11. Tighten the packing nut/we...

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