DeVilbiss JGA-510 Service Bulletin

JGA-510 CONVENTIONAL SPRAY GUN
IMPORTANT: Before using this equip-
ment, read all safety precautions and in-
structions. Keep for future use.
DESCRIPTION
The JGA-510 can be utilized with the wide
range of air caps and needles. It is a general
purpose, heavy duty, high production
spray gun suitable for use with most
types of materials. The fluid tip and needle
and internal fluid passages are stainless
steel.
Conversion to HVLP - The JGA-510, plus
JGA-503 models, can be converted to
HVLP if desired. Contact DeVilbiss for in-
formation.
Note
This gun includes 300 series stain-
less steel fluid passages and 300/400
series tip and needle. Guns may
be used with chlorinated solvent
materials, but see page 2 for
additional warnings.
Important: This gun may be used with
most common coating and finishing ma-
terials. It is designed for use with mildly
corrosive and non-abrasive materials. If
used with other high corrosive or abra-
sive materials, it must be expected that
frequent and thorough cleaning will be
required and the necessity for replace-
ment of parts will be increased.
OPERATION
Note
Protective coating and rust inhibitors
have been used to keep the gun in
good condition prior to shipment.
Before using the gun, flush it with
solvent so that these materials will be
removed from fluid passages.
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
pressure 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 "Troubleshooting",
Page 6, if any problems occur.
PREVENTIVE MAINTENANCE
To clean air cap and fluid tip, brush
exterior with a stiff bristle brush. If neces-
sary to clean cap holes, use a broom straw
or toothpick. 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 suit-
able 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.
Note
When replacing the fluid tip or fluid
needle, replace both at the same
time. Using worn parts can cause
fluid leakage. Matched sets are avail-
able for most pressure feed combi-
nations. See Chart 3. Matched sets
are particularly recommended with
thinner, less viscous materials. 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
(4) or fluid needle (33), be sure to
either 1) pull the trigger and hold
while tightening or loosening the
fluid tip or 2) remove fluid needle
adjusting screw (28) to relieve
spring pressure against needle
collar.
SERVICE BULLETIN
SB-2-252-J
Replaces SB-2-252-I
Major Repair Kit KK-4987-2
Minor Repair Kit KK-5034
FLUID INLET GASKET (7) REPLACEMENT
INSTRUCTIONS
1 . Remove fluid inlet adapter with ap-
propriate wrench.
2 . Clean Loctite from gun body inlet
threads and seal area.
3 . Place gasket (7) squarely onto the fluid
inlet adapter and push it down until it
is flat against the boss.
4 . Place a couple of drops of medium
strength blue No. 242 Loctite on
threads before installing fluid inlet
adapter.
5. Torque fluid inlet adapter to 20-25 ft.
lbs., and tighten locknut.
SPRAY GUN LUBRICATION
Daily, apply a drop of SSL-10 spray gun
lube at trigger bearing stud (21) and the
stem of the air valve (13) where it enters
the air valve assembly (17). The shank of
the fluid needle (33) where it enters the
packing nut (19) should also be oiled. The
fluid needle packing (18) should be lubri-
cated periodically. Make sure the baffle (6)
and retaining ring (1 or 2 ) threads are
clean and free of foreign matter. Before
assembling retaining ring to baffle, clean
the threads thoroughly, then add two
drops of SSL-10 spray gun lube to
threads. The fluid needle spring (30) and
air valve spring (12) should be coated with
a very light grease, making sure that any
excess grease will not clog the air pas-
sages. For best results, lubricate the
points indicated, daily.
A. Trigger Points
B. Packing
C. Adjusting Valves
D. Baffle Threads
E. Air Valve Cartridge
D
B
E
Government NSN No. 4940-01-046-9919 = KK-4987-2.
A
C