Graco Inc 224400, 308131, 224200, PRO 4500sc manual Fan Air Adjustment Valve Repair, Detail

Service

Fan Air Adjustment Valve Repair

1.Prepare the gun for service as instructed on page 22.

2.Place a wrench on the flats of the valve housing and remove it from the handle. See Fig. 20.

NOTE: The fan air valve (43) can be replaced as an assembly or as individual parts.

To disassemble the fan air valve:

1.Rotate the adjustment knob (43c) counterclock- wise, backing out until it stops. Remove the retain- ing ring (43h) and back off the KV HI-LO lever (43g) from the valve housing (43d). See Fig. 20.

2.Using a standard wrench, remove the valve hous- ing (43d) from the gun.

3.Remove the retaining ring (43b).

4.Rotate the adjustment knob (43c) counterclock- wise until it is disengaged from the valve housing threads (43d). Pull the fan valve from the housing. The KV HI-LO lever (43g) and the wave spring (43f) can be removed if necessary.

5.Clean all the parts and inspect them for wear or damage.

6.When reassembling the fan air valve (43), lubricate the o-rings (43e) and the threads on the adjust- ment knob (43c) with petroleum jelly. Reassemble the retaining ring.

7.Apply low strength (purple) Loctite or equivalent thread sealant to the threads of the valve housing (43d). Start the valve housing threads into the handle by turning the adjustment knob (43c). Once the threads are started, rotate the knob (43c) fully counterclockwise. Torque the valve housing (43d) to 10–12 in-lb (1.1–1.4 NSm).

8.Reposition the KV HI-LO lever (43g) back onto the valve housing (43d) in correct orientation. Reinstall the retaining ring (43h) into the groove on the valve housing.

	DETAIL
43b	43d 			43g
0385A	 43e	43f	43h	43c 

Lubricate o-rings (43e) and top knob threads (43c) with petroleum jelly

 Apply low strength (purple) Loctite or equiva-	43
lent to housing (43d) threads; Torque to
10–12 in-lb (1.1–1.4 N.m)

0386A

Fig. 20

308131 29