Graco 220663 Service, Repairing the Ball Check Valves, Repairing the Fluid Piston and Seal

Service

Repairing the Ball Check Valves

NOTE: Parts marked with an asterisk are included in a repair kit, for example, (54*). See pages 38 and 39 for repair kit part numbers. Use all the parts in the kit for the best results.

Disassembly

1.Relieve the pressure.

WARNING

PRESSURIZED EQUIPMENT HAZARD

To reduce the risk of a serious injury whenever you are instructed to relieve pressure, follow the Pres- sure Relief Procedure on page 10.

2.Disconnect the air and fluid lines, remove the pump from its mounting, and place it on a bench.

3.Remove the cap (53) from each side of the outlet housing (33). See Fig. 6.

4.Remove the ball guide (56), ball (57), valve seat (49), and o-ring (48*) on each side of the outlet housing.

5.Inspect the ball stop (55) inside the cap (53) for wear. Remove o–ring (54). Replace if necessary.

6.Clean all parts and inspect for wear or damage. Replace as needed.

Assembly

1.Lubricate the o-rings (48*) and place one in the groove on each valve seat (49).

2.Install the valve seat (49) with the o-ring (48) fac- ing down, ball (57), and ball guide (56) into each outlet housing (33).

NOTE: Stainless steel seats are reversible.

3.Lubricate the o-rings (54*) and the cap (53) threads. Place one o-ring on each cap. Screw the caps into the housing and torque them to 55 to 85 ft-lb (75 to 115 NSm).

NOTE: On stainless steel pumps (Models 220666 through 220668 and Models 237011 to 237013), apply anti-seize lubricant to the threads of the cap (53).

Repairing the Fluid Piston and Seal

NOTE: Parts marked with an asterisk are included in a repair kit, for example, (52*). See pages 38 and 39 for repair kit part numbers. Use all the parts in the kit for the best results.

Disassembly

1.Relieve the pressure.

WARNING

PRESSURIZED EQUIPMENT HAZARD

To reduce the risk of a serious injury whenever you are instructed to relieve pressure, follow the Pres- sure Relief Procedure on page 10.

2.Loosen the tube nuts (A) and remove the outlet manifold (50). Unscrew the connectors (51). Re- move the o–ring (52). See Fig. 6.

3.Remove the screws (34), washers (35), outlet housing (33), piston seal (13*) and retaining plate (12). Remove the o–ring (18). Repeat on the other side of the pump.

4.Holding the screw (16) on one side of the pump, loosen the screw three or four turns on the oppo- site side of the pump, using a socket and breaker bar.

5.Remove the piston (17) by grasping it with your hand and and hit screw (16) with a plastic mallet to drive piston loose from shaft. Remove screw (16) and piston (17).

6.Remove the screws (32), washers (46 or 61), and inlet manifold (47). Remove o–rings (19).

7.Remove the intake housing (36), bellows (14*), and retaining plate (20).

8.Holding the piston shaft (15) flats with a wrench, remove the remaining screw (16).

9.Repeat steps 6 and 7 on the opposite end of the pump. Clean all parts and inspect for wear or dam- age. Replace as needed.

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