Graco 239140, 223596 Displacement Pump Service, Disassembling, Reassembling

Service

Displacement Pump Service

Disassembling

When disassembling the pump, lay out all removed parts in sequence to make reassembling easier. Refer to Fig. 4.

NOTE: Repair Kits and Conversion Kits are available. Refer to the parts list for your pump (pages 14 to 17). For the best results, use all the new parts in the kit.

Parts included in the kit are marked with one asterisk (for example, 3*).

Clean all the parts thoroughly when disassembling. Check them carefully for damage or wear, and replace parts as needed.

1.Remove the displacement pump from the air motor as explained on page 11.

2.Unscrew the intake valve housing (105) from the outlet housing (107). If it is difficult to remove, squirt penetrating oil around the threads and gently tap around the valve housing with a plastic hammer to loosen it.

3.Remove the ball stop pin (113), o-ring retainer (108), o-ring (109), ball guide (101), and ball (112).

4.Loosen the packing nut (104). Push the displacement rod (103) down as far as possible, and pull it out of the outlet housing (107), being careful not to scratch the sleeve (106).

5.Secure the flats of the piston stud (102) in a vise. Screw the displacement rod (103) off the piston stud. Remove the ball (110), retainer (122), packings (124, 115), and glands (117, 121).

6.Remove the packing nut (104), throat packings (123, 114), glands (116, 118), and washer (119) from the outlet housing (107).

7.Inspect all parts for damage. Clean all parts and threads with a compatible solvent before reassembling. Inspect the polished surfaces of the displacement rod (103) and sleeve (106) for scratches, scoring, or other damage, 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. Replace any worn or damaged parts.

NOTE: If the sleeve (106) needs replacement and is hard to remove, contact your Graco distributor.

Reassembling

1.Lubricate the throat packings (114*, 123*). Install the throat packing parts in the outlet housing (107) one at a time, in the order shown in Detail A of Fig.

4.Be sure the lips of the v-packings face down, lubricate the packing nut threads, and install the packing nut finger tight.

2.If you removed the sleeve (106), reinstall it in the outlet housing (107), making sure to replace the gasket (120). To install the gasket, lay it flat in the outlet housing (107) and use the sleeve to seat the gasket against the shoulder of the outlet housing. Be sure the tapered end of the sleeve faces down, toward the pump intake.

3.Lubricate the piston packings (115*, 124*). Install the piston packing parts on the piston stud (102) one at a time, in the order shown in Detail B of Fig.

4.Be sure the lips of the v-packings face up, toward the threads of the piston stud.

4.Place the flats of the piston stud in a vise. Install the piston ball (110*) on the piston and screw the displacement rod (103) onto the piston valve assembly. Torque to 35 to 40 ft-lb (47 to 54 N.m).

5.Insert the displacement rod (103) into the bottom of the outlet housing (107), being careful not to scratch the sleeve (106). Push the rod straight up until it protrudes from the packing nut (104).

6.Install the ball (112*), guide (101), o-ring (109*), retainer (108), and ball stop pin (113) in the intake valve housing (105). Lubricate the intake valve housing threads, and screw the intake valve housing into the outlet housing (107). Torque to 55 to 65 ft-lb (75 to 88 N.m).

7.Reconnect the displacement pump to the air motor as explained on page 11.

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