Gun Repair. Graco 313227A PRO Xs Auto Waterborne Electrostatic Air Spray Gun


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Gun Repair. Graco 313227A PRO Xs Auto Waterborne Electrostatic Air Spray Gun | Manualzz

Gun Repair

Gun Repair

Prepare the Gun for Repair

Installing and repairing this equipment requires access to parts that may cause electric shock or other serious injury if the work is not performed properly. Do not install or service this equipment unless you are trained and qualified.

To reduce the risk of injury, follow the Pressure

Relief Procedure procedure on page 15 before

checking or servicing any part of the system and whenever you are instructed to relieve the pressure.

Check all possible remedies in Gun Operation

Troubleshooting before disassembling the gun.

• Use a vise with padded jaws to prevent damage to plastic parts.

• Lubricate the power supply seal (12a), some packing rod parts (8), and certain fluid fittings with dielectric grease (49), as specified in the text.

• Lightly lubricate o-rings and seals with non-silicone grease. Order Part No. 111265 Lubricant. Do not over-lubricate.

• Only use genuine Graco parts. Do not mix or use parts from other PRO Gun models.

• Fluid Seal Repair Kit 244911 is available. The kit must be purchased separately. Kit parts are marked with a symbol, for example (8a†).

1.

Flush and clean the gun, page 19.

2.

Relieve the pressure, page 15.

3.

Disconnect the gun air and fluid lines.

4.

Remove the gun from the worksite. Repair area must be clean.

28 313227A

Gun Repair

Remove the Gun from the

Manifold

1.

Loosen but do not remove the bottom gun screw

(31) until the gun sits loosely in the mounting

bracket slot (A). See F IG . 21.

NOTICE

The piston return spring (105) is compressed between the manifold and the gun body when they are assembled. To avoid sudden movement of the gun body, loosen the bottom gun screw (31) before loosening the three manifold screws (106). This allows the gun to move forward gradually as the manifold screws are loosened. Hold the gun firmly in hand while loosening the manifold screws.

2.

Holding the gun firmly in hand, loosen the three screws (106) from the back of the manifold.

3.

Remove the gun from the manifold and take it to the service area.

Install the Gun on the Manifold

1.

Make sure the gasket (112) and spring (105) are in

place on the manifold. See F IG . 21. Inspect the parts

for damage and replace them as needed.

2.

Secure the gun to the manifold by tightening the three screws (106).

3.

Secure the gun to the mounting bracket (102) by tightening the bottom screw (31).

105

112

106

A 31 102

TI13433a

F

IG

. 21. Remove Gun from Manifold

313227A 29

Gun Repair

Replace Air Cap/Nozzle

NOTICE

Hold the front end of the gun up and trigger the gun while removing the nozzle to help drain the gun and prevent any paint or solvent left in the gun from entering the air passages.

1.

Prepare gun for repair, page 28.

2.

Remove the charging probe (2), see page 9.

3.

Remove the retaining ring (1), air cap (3), and gun shroud (48).

4.

See F IG . 22. Point gun up while removing the fluid

nozzle (4) assembly with the multi-tool (37).

4

37

1, 3

3

4

4a

4b

1

1a

Fire, Explosion, and Electric Shock Hazard

The nozzle contact ring (4a) is a conductive contact ring, not a sealing o-ring. To reduce the risk of sparking or electric shock, do not remove the nozzle contact ring (4a) except to replace it and never operate the gun without the contact ring in place. Do not replace the contact ring with anything but a genuine Graco part.

Use non-silicone grease, Part No. 111265, on the small o-ring (4b). Do not over-lubricate. Do not lubricate the contact ring (4a).

5.

Lightly lubricate the o-ring (4b). Install it and the contact ring (4a) on the nozzle (4).

6.

Make sure the electrode needle (7) is finger-tight

(page 31).

7.

Trigger gun while installing the fluid nozzle (4) with the multi-tool (37). Tighten until the fluid nozzle seats in the gun barrel (1/8 to 1/4 turn past hand-tight).

8.

Install the gun shroud (48), air cap (3), and retaining ring (1). Make sure the u-cup (1a*) is in place with the lips facing forward.

9.

Install the charging probe (2), see page 9.

10. Test gun resistance, page 22.

F IG . 22. Replace Air Cap/Nozzle

TI13434a

30 313227A

Gun Repair

Replace Electrode Needle

1.

Prepare gun for repair, page 28.

2.

Remove the charging probe (2), see page 9.

3.

Remove the air cap and nozzle, page 30. Remove

the gun shroud (48).

4.

Unscrew the electrode needle (7) with the multi-tool

(37). Hold the packing rod end (8h) to prevent it from

turning, F

IG . 23.

NOTICE

To avoid damaging the plastic threads, be very careful when installing the electrode needle.

5.

Apply low-strength (purple) Loctite® or equivalent thread sealant to the electrode needle and packing rod threads. Install the electrode needle finger-tight.

Do not overtighten.

6.

Install the fluid nozzle (4), page 30.

7.

Install the gun shroud (48) and air cap (3), page 30.

8.

Install the charging probe (2), see page 9.

9.

Test gun resistance, page 22.

10. Install the gun onto the manifold and bracket. See

page 29.

37

7

8h

TI1567A

F IG . 23. Replace Electrode Needle

TI13435a

313227A 31

Gun Repair

Remove Fluid Packing Rod

You may replace the packing rod as an assembly, as

described below, or as individual parts (see page 33).

The assembly is pre-adjusted at the factory.

1.

Prepare gun for repair, page 28.

2.

Remove the charging probe (2), see page 9.

3.

Remove the air cap (3), fluid nozzle (4), and gun

shroud (48), page 30.

4.

Remove the jam nut (28) and actuator arm (29). See

page 34.

NOTE: The fluid nozzle (4) must be in place when removing or installing the jam nut and actuator arm.

5.

Remove the fluid nozzle (4) and electrode needle

(7). See pages 30 and 31.

6.

Remove the packing rod (8), using the multi-tool

(37).

8

F IG . 24. Remove Fluid Packing Rod

37

9

TI13436a

NOTICE

Clean all parts in non-conductive solvent compatible with the fluid being used, such as xylol or mineral spirits. Use of conductive solvents can cause the gun to malfunction.

7.

Check all parts for wear or damage and replace if necessary.

8.

Before installing the packing rod, clean the internal surface of the barrel (9) with a soft cloth or brush.

Check for marks from high voltage arcing. If marks

are present, replace the barrel, page 36.

9.

Install the gun shroud (48) and air cap (3), page 30.

10. Install the charging probe (2), see page 9.

11. Test gun resistance, page 22.

12. Install the gun onto the manifold and bracket. See

page 29.

32 313227A

Gun Repair

Repair Packing Rod

You may replace the packing rod as individual parts or as an assembly. The assembly is pre-adjusted at the factory.

Before installing the fluid packing rod into the gun barrel, make sure the internal surfaces of the barrel are clean. Remove any residue with a soft brush or cloth. Check the inside of the barrel for marks from high voltage arcing. If marks are present, replace the barrel.

To assemble the individual parts:

1.

Place the packing nut (8e) and seal (8b†) on the fluid rod (8h). Flats on the packing nut must face the back of the fluid rod. The seal o-ring must face away

from the packing nut. See F IG . 25

2.

Fill the inner cavity of the spacer (8g†) with dielectric grease (49). Place the spacer on the fluid rod

(8h) in the direction shown. Generously apply dielectric grease to the outside of the spacer.

3.

Place the u-cup packing (8c†), packing spreader

(8d†), and housing (8f) on the packing rod (8h).

4.

Lightly tighten the packing nut (8e). The packing nut is properly tightened when there is 3 lb (13.3 N) of drag force when sliding the packing housing (8f) assembly along the rod. Tighten or loosen the packing nut as needed.

5.

Install the o-ring (8a†) on the outside of housing

(8f). Lubricate the o-ring with non-silicone grease,

Part No. 111265. Do not over-lubricate.

6.

Install the spring (25) against the nut (E) as shown.

7.

Install the packing rod assembly (8) into the gun barrel. Using the multi-tool (37), tighten the assembly until just snug.

8.

Install the electrode needle (7), page 31.

9.

Install the nozzle (4), gun shroud (48), and air cap

(3), page 30.

10. Install the charging probe (2), see page 9.

11. Test gun resistance, page 22.

E

25

8h

8f

8d†

8c†

8g†

8b†

8e

8a†

TI12719a

F IG . 25. Packing Rod

313227A 33

Gun Repair

Piston Repair

1.

Prepare gun for repair, page 28.

2.

Remove the charging probe (2), see page 9.

3.

Remove the air cap, page 30. Remove the gun

shroud (48).

4.

Remove the jam nut (28), actuator arm (29), and

adjustment nut (30). See F IG . 26. The fluid nozzle

(4) must be in place when removing or installing the jam nut and actuator arm.

Description

Shaft O-Ring

(16g)

Front O-Ring

(16e)

Back O-Ring

(16f)

U-Cup (16d)

Table 4: Piston O-Rings

Function

Seals cylinder air along the piston rod

(16b). Replace if air leaks along rod.

Air shutoff seal. Replace if air leaks from air cap when gun is de-triggered.

Separates cylinder air from fan and atomizing air.

Replace if air leaks from small vent hole at back of manifold when gun is triggered.

16a

16d

16c

16e

16f

F

IG

. 26. Actuator Arm

28 29 30 16b TI13437a

TI1575A

5.

Push on the piston rod (16b) to push the piston out the back of the gun.

6.

Inspect the o-rings (16e, 16f, 16g) and u-cup pack-

ing (16d) for damage. See Table 4 and F

IG

. 27.

7.

Lubricate the o-rings (16e, 16f, 16g) and u-cup packing (16d) with non-silicone grease, Part No.

111265. Do not over-lubricate.

8.

Align the two stems (16c) with the holes in the gun body and press the piston assembly into the back of the gun until it bottoms.

9.

Install and adjust the actuator arm, page 35.

16g

16e

Fan Air Side

16f

16b

16d

Atomizing Air Side

16g

TI1576A

F IG . 27. Piston O-Rings

34 313227A

Adjust the Actuator Arm

The fluid nozzle (4) must be in place when removing or installing the jam nut and actuator arm.

1.

Install the adjustment nut (30), actuator arm (29), and jam nut (28) onto the piston rod (16b). Note that the jam nut (28) has a slightly larger hex and a thin-

ner profile than the adjustment nut (30). See F IG . 26 on page 34.

2.

Position the parts so there is a 0.125 in. (3 mm) gap between the actuator arm (29) and the fluid packing rod nut (E), which allows the atomizing air to actuate

before the fluid. See F IG . 28.

3.

Tighten the adjustment nut (30) against the actuator arm (29). Check that the 0.125 in. (3 mm) gap has been maintained. In addition, there should be 3-4 mm of electrode needle travel when the gun is triggered. Adjust the jam nut position to obtain these dimensions.

4.

Install the gun shroud (48) and air cap (3), page 30.

5.

Install the charging probe (2), see page 9.

6.

Test gun resistance, page 22.

7.

Install the gun onto the manifold and bracket. See

page 29.

0.125 in. (3 mm) gap

29

28 30 16b

F IG . 28. Actuator Arm Adjustment

E

TI1567A

313227A

Gun Repair

35

Gun Repair

Remove Barrel

1.

Prepare gun for repair, page 28.

2.

Remove the charging probe (2), see page 9.

3.

Remove the air cap, page 30. Remove the gun

shroud (48).

4.

Carefully loosen the fluid fitting nut (20). Pull the tube (19) out of the fitting (23). Make sure both ferrules (21, 22) and the nut stay with the tube.

5.

Remove the jam nut (28) and actuator arm (29). See

page 34.

6.

Loosen the three screws (10, 32). See F IG . 29.

NOTICE

To avoid damaging the power supply (12), pull the gun barrel (9) straight away from the gun body

(15). If necessary, gently move the gun barrel from side to side to free it from the gun body.

7.

Hold the gun body (15) with one hand and pull the

barrel (9) straight off the body. See F IG . 29.

32

F IG . 29. Barrel Removal

15

9

TI13438a

9

10

15

F IG . 30. Disconnect Fluid Tube

28 29 30 19 20 23

TI13437a

36 313227A

Gun Repair

Install Barrel

1.

Be sure the gasket (11) and grounding spring (14) are in place. Make sure the air holes are aligned

properly. Replace if damaged. See F IG . 31.

2.

Place the barrel (9) over the power supply (12) and onto the gun body (15).

3.

Tighten the three screws (10, 32) oppositely and evenly (about a half turn past snug).

NOTICE

Do not over-tighten the screws (10, 32).

4.

Assemble the fluid tube (19) into the fluid fitting (23).

Ensure that the ferrules (21, 22) are in place.

Tighten the nut (20).

5.

Install and adjust the actuator arm (29) and jam nut

(28). See page 35.

6.

Install the gun shroud (48) and air cap (3), page 30.

7.

Install the charging probe (2), see page 9.

8.

Test gun resistance, page 22.

9.

Install the gun onto the manifold and bracket. See

page 29.

15

12

9

10

11

32

23

19 (Ref)

28

29

14

19

20

TI13439a

F IG . 31. Install Barrel

313227A 37

Gun Repair

Power Supply Removal and

Replacement

• Inspect the gun body power supply cavity for dirt or moisture. Clean with a clean, dry rag.

• Do not expose gasket (11) to solvents.

1.

Prepare gun for repair, page 28.

2.

Remove the barrel (9), page 36.

Be careful when handling the power supply (12) to avoid damaging it.

NOTICE

3.

Grasp the power supply (12) with your hand. With a gentle side to side motion, free the power supply/alternator assembly from the gun body (15), then carefully pull it straight out. Disconnect the flexible circuit (36) from the socket at the top of the body

(15). See F IG . 32.

4.

Disconnect the 3-wire connector (GG) from the power supply. Slide the alternator up and off the power supply. Inspect the power supply and alternator for damage. Disconnect the 6-pin flexible circuit

(36) from the power supply.

5.

Check the power supply resistance, page 24.

Replace if necessary. Before installing the power supply, make sure the o-rings (12a, 13a), spring

(12b), and pads (13e) are in place.

6.

Connect the 6-pin flexible circuit (36) to the power supply.

7.

Connect the 3-wire connector (GG). Slide the alternator (13) down onto the power supply (12).

8.

Lubricate the alternator o-ring (13a) with non-silicone grease, Part No. 111265. Do not over-lubricate.

9.

Lubricate the power supply o-ring (12a) with dielectric grease.

10. Insert the power supply/alternator assembly in the gun body (15). Make sure the ground strips make contact with the body. Connect the flexible circuit

(36) to the socket at the top of the body. Push the

6-pin connector into the socket to ensure it is properly connected.

11. Install the barrel (9), page 37.

12. Test gun resistance, page 22.

36

12

11

12a

12b

15

13e

13

13a

GG

TI13440a

F IG . 32. Power Supply

38 313227A

Turbine Alternator Removal and

Replacement

Replace turbine alternator bearings after 2000 hours of operation. Order Part No. 223688 Bearing Kit.

1.

Prepare gun for repair, page 28.

2.

Remove the power supply/alternator assembly,

page 38.

3.

Disconnect the alternator from the power supply,

page 39.

4.

Measure resistance between the two outer terminals of the 3-wire connector (GG); it should be

2.5-3.5 ohms. If outside this range, replace the alternator coil.

5.

Follow the bearing replacement procedure in the bearing kit manual 308034.

6.

Install the alternator on the power supply, page 39.

7.

Install the power supply/alternator assembly, page

38.

Gun Repair

313227A 39

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