Preventive Maintenance; Parts Replacement - DeVilbiss FLG4 Instructions De Service

PAINTING
Open the spreader adjustment valve (6) (Fan)
by turning the valve stem counterclockwise.
Close the fluid needle adjusting knob (7) by
turning clockwise.
Turn on air supply and set gun inlet
pressure; 23 psi for HVLP use. Some ma-
terials can be sprayed at lower pressures,
improving transfer efficiency.
Spray a test area. Turn the fluid needle
adjusting knob (7) counterclockwise until
a full coat is obtained.
If the finish is too sandy and dry, the
material flow may be too low for the
atomization air pressure being used.
Turn the fluid needle adjusting knob (7)
counterclockwise to increase fluid flow.
If the finish sags, there is too much mate-
rial flowing for the atomization air pressure
being used. Turn the fluid needle adjusting
knob (7) clockwise to decrease fluid flow.
Pattern width can be altered by turning
spreader adjustment valve (6), either
clockwise to decrease the width or counter-
clockwise to increase the width.
Adjust inlet air pressure to provide a uniform
dispersion of atomized paint throughout
the pattern. Keep air pressure as low as
possible to minimize bounce-back and
overspray. Excessive pressure will result in
split spray patterns. Inadequate pressures
will cause heavy centered patterns and poor
atomization.
CLEANING
Note
For routine cleaning, it is not nec-
essary to remove cup from gun.
Do not remove washer (12) from
gun. If washer (12) is removed, it
must be replaced.
Chart 1 – Air Caps
Air Cap (Ref. No. 2)
Computer
Part No. No. Application
FLG-1-1 690000 Conventional
FLG-1-3 690001 HVLP
Chart 2 – Fluid Tips
Fluid Tip (Ref. No. 3) Fluid Tip Fluid Tip
Computer Size
Part No. No. (in.)
FLG-332-13K 803051 0.051
FLG-332-15K 803052 0.059
FLG-332-18K 803053 0.070
FLG-332-22K 803054 0.086
The 702576 cup lid is designed to be dis-
posable but may be cleaned and reused if
slightly contaminated with overspray. If lid
becomes tight, or does not fit, it is due
to extended soaking in solvent. Let lid air
dry overnight and the lid should return to
its original size and fit.
Do not soak the lid in solvent for
extended periods of time. Doing
so could cause cup/lid sealing
problems and leakage.
Remove lid and properly dispose of any
excess paint. Pour in a small amount of
clean solvent. The amount will vary with
different coatings and solvents. Reinstall
lid. Shake cup to wash down the inside
surfaces. Hold 702576 lid while shaking to
prevent lid from coming off. Pull trigger to
allow some solvent to be flushed through
gun. Remove lid and pour out dirty solvent.
Add a small amount of clean solvent and
repeat procedure. Wipe exterior of lid with
a clean cloth and clean solvent.
If a paint filter was used in the bottom of
the cup outlet, it should be removed and
cleaned or replaced at this time. Dispose
of used cup lid if contaminated and replace
with new.
To clean air cap and fluid tip, brush exterior
with a stiff bristle brush. If necessary to clean
cap holes, use a broom straw or toothpick
if possible. If a wire or hard instrument is
used, extreme care must be used to prevent
scratching or burring of the holes which will
cause a distorted spray pattern.
To clean fluid passages, remove excess
material at source, then flush with a suitable
solvent. Wipe gun exterior with a solvent
dampened cloth. Never completely im-
merse in solvent as this is detrimental to
the lubricants and packings.

PREVENTIVE MAINTENANCE

Spray Gun Lubrication
Daily, apply a drop of SSL-10 spray gun lube
at trigger bearing stud (11) and the stem
of the air valve (9). The shank of the fluid
needle (8) where it enters the packing nut
(8) should also be oiled. The fluid needle
packing (8) should be kept soft and pliable by
periodic lubrication. Make sure the baffle (5)
and retaining ring (1) threads are clean and
free of foreign matter. Before assembling
retaining ring to baffle, clean the threads
Size
(mm) Applications
1.3 Stains, lacquers, basecoats, clears.
1.5 General purpose, light to medium viscosity material.
1.8 Primers and medium viscosity materials.
2.2 Latex and heavy materials.
SB-2-775-B
thoroughly, then add two drops of SSL-10
spray gun lube to threads. The fluid needle
spring (7) and air valve spring (9) should
be coated with a very light grease, making
sure that any excess grease will not clog the
air passages. For best results, lubricate the
points indicated, daily.
A. Trigger Points
B. Packing
C. Adjusting Valves
D. Baffle/Air Cap Threads
D
B

PARTS REPLACEMENT

Note
When replacing the fluid tip or fluid
needle, replace both at the same
time. Using worn parts can cause
fluid leakage. Also, replace the
needle packing and fluid tip seal
at this time. Lightly lubricate the
threads of the fluid tip before reas-
sembling. Torque to 15-20 ft-lbs. Do
not overtighten the fluid tip.
The fluid tip part number and tip size are
stamped around the outside of the fluid tip.
See Chart 2 for selecting the proper size
fluid tip for the material you are spraying.
To prevent damage to the fluid tip (3)
or fluid needle (8), be sure to either
1) pull the trigger and hold while
tightening or loosening the fluid tip
or 2) remove fluid needle adjusting
screw (7) to relieve spring pressure
against needle collar.
Chart 3 – HVLP Air Flows
(#3 Cap)
Inlet
Press. Air Flow Press.
(PSI) (SCFM)
15 10
19 11.5
23 13
Page 3
A
C
Cap
(PSI)
6
8
10