Graco 308652Y important safety instructions Service Kits, Servicing the Air Valve

Service

Service Kits

Service Kits may be ordered separately.

To repair the air valve, order Part No. 238853. Parts included in the Air Valve Service Kit are marked with an asterisk in the Parts Drawing on page 17, for example (3*).

For fluid section repair section parts, see the Service Kit Matrix on page 15. Parts included in the Fluid Section Service Kit are marked with a dagger in the Parts Drawing on page 17, for example (4{).

Servicing the Air Valve

Service the air valve as follows. See Fig. 5.

1.Relieve the fluid pressure, and disconnect air line from the pump.

WARNING

To reduce the risk of serious injury whenever you are instructed to relieve pressure, always follow the Pressure Relief Procedure on page 8.

2.Remove the four screws (14) that hold the valve cover (7) on the center housing (1).

3.Remove the valve block (4) and valve carriage (2), and replace the u-cups (3). Replace the valve carriage and valve block. When you replace the valve carriage, position it all the way to one side or the other.

NOTE: The valve block shown in Fig. 5 is for pumps with an air-operated air motor. If your pump has a solenoid-operated air motor, this step does not pertain. Items 2, 3, 4, 16, and 17 are not required.

4.Clean any parts that are dirty.

5.To reinstall the valve cover (7), spread cover apart enough not to damage the square ring packings

(6) and slide cover (7) into the center section.

6.Install the screws (14), and torque to 40 to 45 in-lb (4.5 to 5.0 NSm). See Torque Sequence on page 18.

7.Reconnect the pump.

6

1416

17

4

7

1

1 3

2

1 3

6

Fig. 5

Lips of u-cups (3) must face toward each other

1(toward center of valve carriage (2)).

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