Maintenance. Graco 3A4798C, Pro Xp Waterborne Auto Air Spray Gun

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Maintenance. Graco 3A4798C, Pro Xp Waterborne Auto Air Spray Gun | Manualzz

Maintenance

Maintenance

To reduce the risk of an injury, follow the

Pressure

Relief Procedure whenever you are instructed to

relieve the pressure.

To reduce the risk of fire and explosion, turn off the turbine air before flushing the gun and always ground equipment and waste container. To avoid static sparking and injury from splashing, always flush at lowest possible pressure.

Daily Care and Cleaning

Checklist

Check the following list daily upon completion of equipment usage.

Flush the gun. See

Flushing , page 22.

Clean the fluid and air line filters.

NOTICE

Do not use methylene chloride as a flushing or cleaning solvent with this gun as it will damage nylon components.

1.

Turn off the turbine air.

2.

Switch the fluid supply to a compatible solvent.

3.

Trigger the gun to flush the fluid passages clean.

Clean the outside of the gun. See Clean the Gun

Daily , page 22.

Clean the air cap and fluid nozzle daily, minimum.

Some applications require more frequent cleaning. Replace the fluid nozzle and air cap if they

are damaged. See Clean the Gun Daily , page

22.

Check the electrode and replace if broken or dam-

aged. See Electrode Replacement on page 32.

Check for fluid leakage from the gun and fluid hoses. See

Check for Fluid Leakage on page

23. Tighten fittings or replace equipment as

needed.

Clean the Gun Daily

NOTICE

• Clean all parts with a compatible solvent.

Conductive solvents can cause the gun to malfunction.

• Fluid in the air passages could cause the gun to malfunction and could draw current and reduce the electrostatic effect. Fluid in the power supply cavity can reduce the turbine life. Whenever possible, point the gun down when cleaning it. Do not use any cleaning method which could allow fluid into the gun air passages.

Check Gun Electrical Grounding

,

page 16

.

Flushing

• Flush before changing fluids, before fluid can dry in the equipment, at the end of the day, before storing, and before repairing equipment.

• Flush at the lowest pressure possible. Check connectors for leaks and tighten as necessary.

• Flush with a fluid that is compatible with the fluid being dispensed and the equipment wetted parts.

1.

Turn off turbine air (TA).

2.

Flush the gun. See Flushing , page 22

3.

Follow the

Pressure Relief Procedure

,

page 18.

4.

Clean the outside of the gun with a compatible solvent. Use a soft cloth. Wring out excess fluid from cloth. Point the gun down to prevent solvent from entering the gun passages. Do not immerse the gun.

WLD

WLD WLD

22 3A4798C

Maintenance

5.

Clean the air cap.

a.

Follow the

Pressure Relief Procedure

,

page

18.

b.

Remove the air cap assembly (24, 25) and

shroud (26). See F IGURE

11.

c.

Wipe the fluid nozzle (4) of the gun clean with a cloth dampened in solvent. Avoid getting any solvent into the air passages. Whenever possible, point the gun down when cleaning it.

d.

If it appears that there is paint inside the fluid nozzle (4) air passages, remove the gun from

the line for servicing. See Air Cap and Nozzle

Replacement , page 31 to remove the fluid noz-

zle for cleaning or replacement.

e.

Clean the air cap (25) with a soft bristle brush and solvent, or submerge the air cap in suitable solvent and wipe it clean. Do not use metal tools.

f.

Open and slide the shroud (26) onto the gun.

g.

Carefully install the air cap (25). Be sure to insert the electrode (3) through the center hole of the air cap. Rotate the air cap to the desired position.

h.

Make sure the u-cup (24a) is in place on the retaining ring (24). The lips must face forward.

Tighten the retaining ring until the air cap is held firmly in place; you should not be able to rotate the air cap horns by hand.

Check for Fluid Leakage

If any fluid leakage from the gun is detected, stop spraying immediately. Fluid leakage into the gun shroud could cause fire or explosion and result in serious injury and property damage.

To reduce the risk of an injury, follow the

Pressure

Relief Procedure

whenever you are instructed to relieve the pressure.

During operation, periodically check all openings of the

gun shroud (ZZ) for the presence of fluid. See F

IGURE

12. Fluid in these areas indicates leakage into the

shroud, which could be caused by leaks at the fluid tube connections or fluid packing leakage.

If fluid is seen in these areas:

1.

Stop spraying immediately.

2.

Relieve the pressure. See Pressure Relief Procedure , page 18.

3.

Remove the gun for repair.

i.

Test gun resistance, page 24.

ZZ

ZZ

F IG . 12. Check for Fluid Leakage

26

24

24a

25

4

3

F IG . 11. Clean Air Cap and Fluid Nozzle

3A4798C 23

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