Graco Inc 308639L Removing and Replacing Bearings and Air Gasket See Fig, Tools Required

Service

Removing and Replacing Bearings and Air Gasket (See Fig. 9)

Tools Required

DTorque wrench

D13-mm socket wrench

DBearing puller

DO-ring pick

DPress, or block and mallet

Disassembly

NOTE: Do not remove undamaged bearings. This procedure is only for replacing bearings that are damaged.

1.Relieve the pressure.

WARNING

To reduce the risk of serious injury whenever you are instructed to relieve pressure, always follow the Pressure Relief Procedure on page 9.

2.Remove the manifolds, and disassemble the ball check valves as explained on page 14.

3.Remove the fluid covers and diaphragm assemblies as explained on pages 15 and 16.

NOTE: If you are removing only the diaphragm shaft bearing (8), skip step 4.

4.Disassemble the air valve as explained on page 12.

5.Using a 13-mm socket wrench, remove the screws (27) holding the air covers (1) to the center housing (2). See Fig. 9.

6.Remove the air cover gaskets (10). Always replace the gaskets with new ones.

7.Use a bearing puller to remove the diaphragm shaft bearings (13), piston actuator bearings (8), and push pin bearings (17). Do not remove any bearings if they are not damaged.

Reassembly

1.Insert the bearings (8, 13, and 17) into the housing (2), tapered end first. Using a press or a block and mallet, press-fit each bearing so it is flush with the surface of the housing.

2.Reassemble the air valve as explained on page 13.

3.Install the u-cup shaft seals (15) with the lips facing away from the bearing (13). See Fig. 8.

4.Align each new air cover gasket (10) so the push pin (18) protruding from the center housing (2) fits through the proper hole (H) in the gasket, as shown in Fig. 8.

5.Align each air cover (1) so the through hole is on the bottom, as shown in Fig. 8. Install the screws (27) handtight. Using a 13-mm socket, torque the screws oppositely and evenly to 19 to 21 ft-lb (26 to 28 NSm).

6.Install the diaphragm assemblies and fluid covers as explained on page 16.

7.Reassemble the ball check valves and manifolds as explained on page 14.

18 308639