EN
SB-2-303-F (1/2016)
3 / 8
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 packings at this time.
Lightly lubricate the threads of
the fluid tip before reassembling.
Torque to 20 - 25 ft. lbs.
To prevent damage to the fluid tip
(3) or fluid needle (3B), be sure to
either 1 ) pull the trigger and hold
while tightening or loosening
the fluid tip or 2) remove fluid
needle adjusting screw (27) to
relieve spring pressure against
needle collar.
TROUBLESHOOTING
Leakage from the tip can be caused by
sluggish needle travel, improperly mixed
zinc solution, or worn tip and/or needle.
If leakage occurs during application, clean
the gun and hoses out and remove fluid
tip. Inspect the interior seating surfaces.
If large particles appear to be imbeded
into the tip seat, scrape the surfaces with
a blunt object. Then, attempt to remove
agglomerates from the balance of solution
by straining.
Fluid Tip – If large imbedded clumps
cannot be removed, or if the tip seating
surface is worn, it will be necessary to
replace the tip and needle. Satisfactory
operation depends on the unique DeVilbiss
tip design, smooth needle shaft, and
lubricated and properly adjusted packings.
A. Trigger Points
B. Packing
C. Adjusting Valves
D. Threads
A
B
A
C
D
In order to insure proper operation,
replace these parts when tip leakage
occurs due to wear:
AV-4915-D Fluid Tip
MBC-496-DEX Fluid Needle
AV-1-K5 Gasket
(Zinc waterborne gun)
AV-2115-D Fluid Tip
MBC-496-DEX Fluid Needle
AV-1-K5 Gasket
(Zinc solvent-based gun)
MB-135-K9
pre-lubricated leather packings (3)
(both guns)
SPRAY GUN LUBRICATION
Daily, apply two drops of •SSL-10 spray gun
lube (see Accessories) at trigger bearing
stud (29) and the stem of the air valve (19)
where it enters the air valve assembly.
The shank of the fluid needle (3B) where
it enters the packing nut (7) should also
be oiled. The fluid needle packing (3A)
should be kept soft and pliable by periodic
lubrication. Make sure the sprayhead (6)
and retaining ring (1) 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 (26) and air valve spring (20)
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.
• Safety Data Sheet available from
DeVilbiss upon request.
