Graco Inc 3500WB Fluid Adjustment Assembly Repair continued, Air Trigger Valve Repair, Service

Service

Fluid Adjustment Assembly Repair (continued)

5.To remove the sleeve (45d), hold the cap (45c) and turn the sleeve stop (45e) counterclockwise with a pliers.

6.Remove the stem (45a) and o-ring (45b).

7.Repair or replace any damaged parts. Lubricate the o-ring (45b).

8.Carefully apply low strength (purple) Loctiter or equivalent thread sealant to the sleeve (45d) external threads. Turn the sleeve in with the sleeve stop (45e) until it is bottomed out, then back it out 1/8 turn.

CAUTION

Do not allow Loctite to get onto the stem (45a) during assembly or the stem will not turn.

9.Place the fluid adjustment assembly on the work- bench with its threaded end facing down and allow the Loctite to cure over night.

10.After the Loctite has cured, assemble the fluid adjustment assembly into the gun.

Air Trigger Valve Repair

1.Prepare the gun for service as instructed on page 30.

2.Using a 14 mm socket wrench, remove the fluid adjustment assembly (45), o-ring (23), and spring (44). See Fig. 22.

3.Loosen the air valve packing nut (40) one full turn. Remove the air valve shaft (39) with a pliers.

CAUTION

When removing the air valve shaft (39), be careful not to damage the seat area.

4.Check the o-rings (41, 23) for damage and replace them if necessary. Apply a very light coat of petroleum jelly to the o-rings.

CAUTION

Do not over-lubricate parts. Excessive lubricant on the o-ring (41) and air valve shaft (39) can be pushed into the gun air passage and blemish the finish on the workpiece.

5.Unscrew the packing nut (40) to check the u-cup (42). Do not remove the u-cup unless it is dam- aged.

6.Install the air valve shaft (39), with the o-ring (41), and spring (44) into the back of the gun handle (7). If the u-cup (42) was removed, install the air valve shaft (39) before installing the u-cup. Install the u-cup with its lips facing into the gun handle.

7.Install the fluid adjustment knob (45), with the o-ring (23). Tighten the cap with a screw driver. Tighten the air valve packing nut (40) until it bot- toms.

Apply a very light coat of lubricant to the o-rings (41, 23).

Carefully apply low strength (purple) Loctite or equivalent to sleeve (45d) external thread. Turn sleeve in with sleeve stop (45e) until it bottoms out, then back out 1/8 turn. Allow Loctite to cure overnight.

Do not remove u-cup (42) unless damaged. Install with lips facing into handle. Tighten packing nut (40) until it bottoms.

45

45a 45c

45b  45d

44

39

 41

23

45e

40, 42 

05162B

Fig. 22

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