Troubleshooting - 3M Graco 50261 Manuel D'instructions

Daily Gun
Fig. 17
5. With the gun pointed down, clean the front of the gun, using the
soft-bristle brush and solvent.
6. Scrub the air cap retaining ring, air cap, and fluid nozzle with the
soft-bristle brush. To clean out air cap holes, use the small brush
provided. Clean the air cap and fluid nozzle daily, minimum.
Some applications require more frequent cleaning. Do not soak
the air cap retaining ring in solvent for prolonged periods of time.
7. To avoid galling of the fluid nozzle in the spray housing (2a) apply
a thin film of lubricant to the back surface of the nozzle taper
where it seats and also to the nozzle threads. Trigger the gun while
you install the fluid nozzle (12) with the gun tool (28). Tighten the
nozzle securely to 4.5 N•m (40 in-lb) to obtain a good seal.
Do not over torque.
8. Install the air cap retaining ring (15) and air cap (14).
9. Dampen a soft cloth with solvent and wring-out the excess.
Point the gun down and wipe off the outside of the gun.
WARNING
PRESSURIZED EQUIPMENT HAZARD
To reduce the risk of a serious injury, follow the Pressure Relief
Procedure on page 6 whenever you
Correct fan pattern
PROBLEM
Fluttering or spitting spray
Pattern is curved
Care and Cleaning
Fig. 18

Troubleshooting

are instructed to relieve pressure.
Follow all Setup procedures, starting on page 3. Hang some 3M masking paper. Hold spray gun with
Air Cap perpendicular and 200mm (8") from masking paper. Spray for two seconds and check what
you get for fan pattern outline on the paper. See troubleshooting chart for how to adjust / service
spray gun to correct Fan Pattern defects.
CAUSE AND SOLUTION
Loose or damaged fluid tip/seat
Material level too low in cup (Refill cup).
Gun cup tilted too far over or upside down while spraying (Purge Air out of PPS cup).
Partial obstruction in fluid passage (Flush with solvent).
Dry or loose fluid needle packing nut (Lubricate or tighten).
Air Cap or Fluid Tip Defective. Determine if defect is in the Air Cap or Fluid Tip. Rotate Air Cap
one-half turn and spray another test pattern. If defect is inverted/reverse of previous fan pattern,
then defect is in the Air Cap. Clean Air Cap.
If defect is not inverted/reverse of previous Fan Pattern, defect is in the Fluid Tip. Check Fluid Tip for
damage or partial blockage with dried material. Check Fluid Needle Tip for damage. Replace as necessary.
Torque to 4.5 N•m (40 in-lb)
Fig. 19
Fig. 20
(Tighten or replace).
8
2
1 1
12