Air Valve Service, Fluid Packing Replacement

Service

WARNING

To reduce the risk of serious injury, including fluid injection, and splashing in the eyes or on the skin, or injury from moving parts or electric shock, al- ways follow the Pressure Relief Procedure Warning on page 10 before servicing any part of the gun or system.

NOTE: Follow the Service Notes in Fig. 7 when reas- sembling the gun. Also refer to the parts drawing on page 14 for parts not shown in Fig. 7.

Air Valve Service

1.Remove the trigger (3) and valve cap (11). See Fig. 7.

2.Unscrew the needle nut (49) while holding the flats of the air valve (52) stem with a long nose pliers.

ECAUTIONTo prevent leakage, be careful not to scratch the

3.Remove the spring (10) and air valve (52). See Fig. 7.

4.If there is air leakage at the air valve (52), unscrew the packing nut (50) and carefully remove the u-cup packing (51). Replace packing if worn or damaged. When reinstalling, be sure the u-cup faces inward.

5.If leakage occurs internally or the front of the gun leaks air when untriggered, clean and inspect the air valve and the spring for wear or damage.

Replace as needed.

6.For best air valve life, lubricate the external air valve shaft (point A) with light oil after each day’s use.

Fluid Packing Replacement

1.If leakage occurs at the back of the fluid needle (5), replace the needle packings (47) and inspect the needle shaft. See Fig. 7.

2.Remove the air cap retainer (25), air cap (27), fluid tip (28), and air separator (32).

3.Pull the trigger to back the fluid needle ball off the seat. Unscrew the diffuser (30). Inspect the fluid gasket (33) for any visible damage. Remove and replace if necessary.

4.Remove the trigger (3).

5.Remove the hex nut (21) from the fluid needle (5) while holding the square part of the fluid needle.

6.Pull the fluid needle (5) and compression spring (24) from the front of the gun.

7.To remove the old packings, insert the packing removal tool (55) into the front of the gun and screw it into the packings (47). Pull the packings from the front of the gun. Clean and inspect all parts for wear or damage, replacing as needed.

8.Insert the new packings (47) onto the needle (5) shaft as shown in Detail D of Fig. 7.

9.Install the fluid needle (5) with the packings (47). Be careful not to damage the packings.

10.Screw the hex nut (21) to the bottom thread of the needle. Torque it to 4 to 6 in-lb (5 to 8 N*m); do not over tighten.

11.Install the trigger. Lubricate the diffuser threads. Pull the fluid needle (5) back with the trigger while screwing the diffuser (30) back into the gun. Torque it to 23 to 27 ft-lb (37 to 32 Nom).

12.Reassemble the air separator (32))fluid tip (28), air cap (27), and air cap retainer (25).

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AA2000 specifications

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