Graco Displacement Pump 222017

NOTE: Repair Kits are available. See page 6. For the best results, use all the new parts in the kit, even if the old ones look good. Eight shims (14*) are included in the kit, but use only the number required. An asterisk behind a reference number, for example (3*), indicates that this part is included in the repair kit.

Solvent flush the pump, if possible. Follow the Pressure Relief Procedure on page 2, stopping the pump at the bottom of its stroke. Then disconnect all hoses from the pump.

Unscrew the displacement rod (1) from the air motor connecting rod.

Screw the intake valve housing (24) out of the cylinder (11). See Fig. 1. Disassemble and clean the parts of the valve, inspecting for damage or wear. If the seat in the valve housing is chipped or worn, replace the housing (24).

Loosen the packing nut (2). Push down on the displacement rod (1) until you can grasp the piston stud (20). Pull the displacement rod out the bottom of the cylinder (11).

Inspect the outer surface of the displacement rod (1) and the polished inner surface of the cylinder sleeve (12) for scoring or wear by running a finger over the surface or holding up to a light at an angle. Damage to these parts may cause premature packing wear or leaking. If either is worn or scratched, replace it.

Unscrew the piston stud (20) from the displacement rod (1). Remove the ball (13), shims (14), backup washers (15), glands (16 and 19), and v-packings (17 and 18). Clean all parts and inspect for damage. If the seat on the piston stud (20) is nicked or worn, replace it.

Remove the packing nut/wet-cup (2). Remove the bearing (3), glands (4 and 7), and v-packings (5 and 6) from the throat of the pump cylinder (11). Clean all parts and inspect for damage.

Lubricate all packings before reassembling the pump.