GUN OPERATION TROUBLESHOOTING CHART

PROBLEM

CAUSE

SOLUTION

 

 

 

 

Leakage from fluid pack-

Worn needle packing.

Replace packing assembly.

ing nut.

 

See page 20.

 

 

 

 

Air leakage from front

Air valve not seating properly.

Clean, service. See page 24.

of gun.

Air stem packing too tight.

Loosen packing. See page 24.

 

 

 

 

Fluid leakage from

Electrode worn or damaged.

Replace electrode. See page 18.

front of gun.

Worn fluid seat.

Replace fluid nozzle and/or electrode.

 

 

 

See page 18.

 

Fluid packing too tight.

Adjust packing screw. See page 20.

 

Loose fluid nozzle.

Tighten fluid nozzle. See page 12.

 

Cylinder air to gun not completely shut off.

Adjust screw.

 

 

 

ªOrange Peelº finish.

Insufficient air pressure.

Increase, use least air pressure

 

 

needed for good results.

 

Fluid poorly mixed or filtered.

Remix or refilter fluid.

 

Improper thinner being used.

Use proper thinner.

 

 

 

 

Excessive spray fog.

Too much air pressure.

Reduce, use least air pressure

 

 

needed for good results.

 

Fluid thinned too much.

Properly thin fluid.

 

 

 

 

No fluid sprays from

Fluid low.

Check, add if necessary.

gun.

Damaged air cap.

Replace air cap. See page 12.

 

 

Dirty or clogged fluid nozzle.

Clean fluid nozzle. See page 12.

 

Damaged fluid nozzle.

Check, replace fluid nozzle.

 

 

See page 12.

 

Air Valve not actuating.

Check cylinder air, fluid needle packing,

 

 

and needle. Replace parts as necessary.

 

 

See page 21.

 

Damaged fluid needle

Replace. See page 20.

 

 

 

 

Equipment covered

Exhaust air flow insufficient or not directed

Check for proper CFM, check baffles

with fluid.

properly.

and direction of air flow.

 

Improper distance between gun and

Adjust distance to 203±305 mm

 

work piece.

(8±12 in.).

 

 

 

 

Dirty air cap.

Misalignment between air cap and

Remove and clean air cap and fluid

 

fluid nozzle.

nozzle as described on page 12, then

 

 

reinstall them.

 

 

 

 

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Page 14
Image 14
Graco Inc 218-745, 307-712, PRO 5000 manual GUN Operation Troubleshooting Chart, Problem Cause Solution