Complete Gun Packing Replacement

Service

22.To tighten the packing screw (8), turn the screw in until it touches the fluid packings (5), then tighten one full turn to pre-set the packings. Loosen the screw, then turn it in until it touches the packings again. Tighten the screw 1/12 turn more (equal to half the distance between points on the hex head).

23.Trigger the gun to test the needle movement. If the needle does not return after the trigger is released or is slow in returning, loosen the packing screw

(8)slightly until the needle returns freely.

24.Install the air cap (14) and air cap retaining ring

(15).Hand-tighten the ring.

25.Make sure the gun fluid packings are sealing properly by spraying solvent at low pressure before fully pressurizing the gun with the fluid to be sprayed.

If the fluid packings leak, tighten the packing screw

(8)slightly and retest until the packings and needle seal completely.

WARNING

PRESSURIZED EQUIPMENT HAZARD

To reduce the risk of a serious injury, follow the Pressure Relief Procedure on page 12 before checking or repairing any part of the gun or sys- tem.

NOTE:

DGun Repair Kit 239639 is available. The kit includes an o-ring (2b), fluid packing kit (5), u-cups (16, 20, 25b), and air valve assembly (26).

DClean parts with a solvent that is compatible with the parts and the fluid being sprayed.

DLightly lubricate the parts indicated in Fig. 28 with lubricant 111265.

1.Relieve the pressure.

2.Remove the air cap retaining ring (15) and air cap

(14).See Fig. 26, page 18.

3.Trigger the gun while you remove the fluid nozzle

(12)with the gun tool (28).

CAUTION

Trigger the gun whenever you tighten or remove the nozzle. This keeps the needle seat away from the nozzle seating surface and prevents the seat from being scratched.

4.Remove the fluid adjustment knob (21) and fluid spring (23). See Fig. 28, page 19.

5.Pull the fluid needle (13) out the back of the gun.

6.Remove the screw (11), pin (17), and trigger (10).

7.Remove the hex nut (9) with the gun tool (28).

8.Remove the spray housing (2a) and insert (4). Remove the o-ring (2b) with a pick and install the new o-ring.

To ease o-ring installation, place the insert (4) into the spray housing (2a) to plug the end. Install one end of the o-ring into the groove in the housing, then press the rest of the o-ring into place.

9.Unscrew the packing screw (8) from the insert (4) with the gun tool (28).

10.Use the back end of the fluid needle (13) to push the three fluid packings (5) out of the insert (4). Be careful not to damage the needle or insert. Discard the old fluid packings.

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