Disassembly

Model 222–638 Displacement Pump

(Used on Models 222–526, 222–539, 223–984 and 223–991)

NOTE: Before beginning, read “Before Y ou Start” on page 8.

NOTE: Refer to Fig 3 and the parts drawing during the following procedure.

1.Remove the cotter pin (41). Unscrew the coupling nut (50) and the three tie rod locknuts (44). Pull the displacement pump (2) off the air motor (1).

2.Remove the cotter pin (42). Loosen the locknut (45). Unscrew the connecting rod (53) from the displace- ment 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 the displacement rod (60) down until the priming piston

(37)clears the intake valve housing (28). Remove the nut (6), priming piston (37), valve plate (36) and plate guide (31).

4.Unscrew the four tie bolts (8) and pull the intake valve housing (28) off the pump. Pull the priming rod (62) and displacement rod (60) out of the bottom of the cylinder (59). Remove the pin (7) and unscrew the priming 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) for scratches or scoring, which can cause premature packing wear and leaking. To check, run a finger over the surface or hold the part up to the light at an angle.

6.Disassemble the intake valve (3). Clean and inspect all parts, replacing as necessary . Check the intake valve seat (30) for nicks or damage.

7.Unscrew the adapter (61) from the displacement rod

(60).Remove and inspect the piston (38). Disas- semble the piston.

8.Unscrew the packing nut/wet–cup (21). Remove the wiper seal (66). Remove the throat packings from the outlet housing (26).

9.Clean and inspect all parts, replacing as necessary.

Reassembly

NOTE: Refer to Fig 3 and the parts drawing during the following 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 in- stall it into the outlet housing (26). Be sure the lips of the v–packings are facing down. Install the wiper seal (66) in the groove of the wet–cup (21) with the lips facing 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 sure the lips of the packing are facing up.

10306–646

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 the displacement rod just protrudes from the packing nut/wet–cup (21). Lubricate the priming rod (62).

6.Install the cylinder (59) in the outlet housing (26), be- ing careful not to scratch the polished inner surface of 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 lips of the v–packings are facing up. Tighten the packing nut (11). Install the valve seat (30) in the intake valve housing (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

9.Carefully guide the intake valve housing (28) up over the 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 hous- ing. Torque the tie bolts oppositely and evenly to 60 ft–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 provide sufficient clearance from the intake valve housing

11.Tighten the packing nut/wet–cup (21) just enough to prevent leakage – no tighter.

12.Check the alignment of the displacement rod (60) by inserting a size E (0.254 in. diameter) drill shank be- tween the packing nut/wet–cup (21) and the rod. If the drill shank cannot be passed freely around the rod, tighten the tie bolt (8) on the side which is bind- ing.

13.Screw the connecting rod (53) into the top of the dis- placement rod (60). Insert the cotter pin (42) and tighten the locknut (45).

14.Align the pump outlet on the outlet housing (26) with the optional outlet at the base of the air motor (1). Loosely screw the tie rod locknuts (44) onto the tie rods (52). Lubricate the o–ring (47) and the top thread of the connecting rod (53). TIghten the cou- pling 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 the locknuts (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.