Graco Inc 308639L Service, Repairing the Air Valve, Tools Required, Groove

Service

Repairing the Air Valve

Tools Required

DTorque wrench

D7-mm or 9/32-in. socket wrench or TorxR screwdriver T20

DNeedle-nose pliers

DO-ring pick

DLithium-base grease, Part No. 111920 (Lubriplate 630AA or equivalent)

NOTE: Air Valve Service Kit 238765 is available. Parts included in the Air Valve Service Kit are marked with a symbol in the Air Motor Parts List, for example (3{). See page 23. Use all the parts in the kit for the best results.

Disassembly (See Fig. 4)

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.With a 7-mm or 9/32-in. socket wrench or TorxR T20 screwdriver, remove the screws (3), air valve cover (5), and valve cover gasket (20).

3.Move the main valve (6) to the center position, and pull it out of the cavity. Using a needle-nose pliers, pull the pilot block (16) straight up and out of the cavity.

4.Pull the two actuator pistons (7) out of the bearings (8). Remove the u-cup seals (9) from the pistons. Pull the push pins (18) out of the bearings

(17).Remove the o-rings (19) from the housing

(2)with an o-ring pick.

5.Inspect the valve plate (11) in place. If damaged, use a TorxR T20 screwdriver or 7-mm or 9/32-in. socket wrench to remove the screws (3).

6.Remove the valve plate (11) and seal (12). See Fig. 5.

7.Inspect the bearings (8 and 17) in place. The bearings are tapered, and, if damaged, must be removed from the outside. See Removing and Replacing Bearings and Air Gasket on page 18.

8.Clean all parts and inspect for wear or damage. Replace as needed. Reassemble as explained on page 13.

23

5

20

6

2

11	3	2
		8	19 6
16 1		17	groove
			18	4

1	Apply grease to lapped	3 6 9		06323
	surfaces of 16.		5 7

2Torque to 28 to 50 in-lb (3.2 to 5.6 NSm).

3Install with lips facing narrow end of piston.

4Insert narrow end first.

5Insert wide end first.

06322 6 Grease.

Fig. 4

12 308639