DeVilbiss MBC-510 Service Bulletin

IMPORTANT: Before using this equipment,
read all safety precautions and instructions.
Keep for future use.
Note
This gun may be used with chlori-
nated solvents. Aluminum is not
used in the fluid passage areas.

DESCRIPTION

The MBC-510 standard spray gun has a
removable sprayhead; nickel plated brass
fluid passages; a stainless steel fluid tip and
needle to reduce wear; forged aluminum gun
body; large air and fluid passages for high
capacity use and a cartridge type air valve to
minimize repairs.
Nozzle combinations are listed in Chart 1.
Refer to the Spray Gun Catalog, I-2008, for
information regarding air cap and fluid tip
characteristics.

OPERATION

Strain material thru 60 or 90 mesh screen.
Adjust fluid pressure to deliver the desired
paint volume. Adjust air pressure and flow to
provide a uniform dispersion of atomized
paint throughout the pattern. Keep air pres-
sure as low as possible to minimize bounce
- back and overspray. Excessive fluid flow
will result in heavy center spray patterns.
Inadequate flows may cause the pattern to
split. See Spray Gun Guide, SB-2-001, which
is available upon request, for details con-
cerning set up of spray guns.

PREVENTIVE MAINTENANCE

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 tooth-
pick. Never use a wire or hard instrument.
This may scratch or burr holes causing a
distorted spray pattern.
To clean fluid passages, remove excess
material at source, then flush with a suitable
solvent using a device such as the
SolventSaver™ (see Accessories). Wipe gun
exterior with a solvent dampened cloth. Never
completely immerse in solvent as this is
detrimental to the lubricants and packings.
MBC-510 SPRAY GUN
Note
When replacing the fluid tip or fluid
needle, replace both at the same time.
Using worn parts can cause fluid leak-
age. For thinner, less viscous materi-
als a lapped tip and needle set is
recommended. See Chart 3. Also,
replace the needle packing at this time.
Lightly lubricate the threads of the
fluid tip before reassembling. Torque
to 20-25 ft. lbs. Do not over tighten
the fluid tip.
To prevent damage to the fluid tip (5)
or fluid needle (11), be sure to either
1) pull the trigger and hold while
tightening or loosening the fluid tip
or 2) remove fluid needle adjusting
screw (32) to relieve spring pressure
against needle collar.

SPRAY GUN LUBRICATION

Daily, apply two drops of •SSL-10 spray gun
lube (see Accessories) at trigger bearing stud
(34) and the stem of the air valve (15) where
it enters the air valve assembly. The shank
of the fluid needle (11) where it enters the
packing nut (10) should also be oiled. The
fluid needle packing (9) should be kept soft
and pliable by periodic lubrication. Make
sure the sprayhead (8) and retaining ring (1
or 2) threads are clean and free of foreign
material. Before assembling retaining ring to
sprayhead, clean the threads thoroughly,
then add two drops of SSL-10 spray gun
lube to threads. The fluid needle spring (31)
and air valve spring (16) 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 indi-
cated, daily.
• Material Safety Data Sheet available from
DeVilbiss upon request.
A. Trigger Points
B. Packing
C. Adjusting Valves
D. Threads
C
A
CHART 1
Nozzle Combinations
Air Cap Sizes
Order From
Chart 2
24
30
58
62HD
64HD
69HD
80
704
765
777
797
9000
P - Pressure Feed Combination
S - Suction Feed Combination
CHART 2
Air Caps
No. on
Cap
Order
24
30
58
62HD
64HD
69HD
80
704
765
777
797
9000
A
D
B
SERVICE BULLETIN
SB-2-301-Q
Replaces SB-2-301-P
Repair Kit KK-4058-1
Fluid Tip and Needle Sizes
Order From Chart 3
AC D E EX FF FX
P P P
P S P P
P/S S P P
P
P
P
S
P P
P P P
P P
P P
S
Ref. Nos. (1) Ref. No. (3)
Air Cap Air Cap
with Ring Less Ring
AV-40-24
MB-4039-30
AV-439-58
MB-4039-62HD
MB-4039-64HD
MB-4039-69HD
MB-4039-80
AV-1239-704
AV-1239-765
31767-777
AV-1239-797
AV-440-9000