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DeVilbiss JGA-510 Service Bulletin

Conventional spray gun
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IMPORTANT: Before using this equip-
ment, read all safety precautions and in-
structions. Keep for future use.
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
Conversion to HVLP - The JGA-510, plus
JGA-503 models, can be converted to
HVLP if desired. Contact DeVilbiss for in-
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.
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.
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
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
Replaces SB-2-252-I
Major Repair Kit KK-4987-2
Minor Repair Kit KK-5034
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
Torque fluid inlet adapter to 20-25 ft.
lbs., and tighten locknut.
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.
Trigger Points
Adjusting Valves
Baffle Threads
Air Valve Cartridge
Government NSN No. 4940-01-046-9919 = KK-4987-2.



  Summary of Contents for DeVilbiss JGA-510

  • Page 1 Torque fluid inlet adapter to 20-25 ft. JGA-503 models, can be converted to Never completely immerse in solvent as lbs., and tighten locknut. HVLP if desired. Contact DeVilbiss for in- this is detrimental to the lubricants and formation. packings. SPRAY GUN LUBRICATION...
  • Page 2: Safety Precautions

    Page 2 SB-2-252-J SAFETY PRECAUTIONS This manual contains information that is improtant for you to know and understand. This information relates to USER SAFETY and PREVENTING EQUIPMENT PROBLEMS. To help you recognize this information, we use the following symbols. Please pay particular attention to these sections.
  • Page 3 SB-2-252-J Page 3 CHART 1 NOZZLE COMBINATIONS Air Cap Fluid Tip and Needle Size Sizes Order From Chart 3 Order From Chart 2 FX FW GX Orifice in./ .110 .080 .070 .070 .070 .055 .042 .063 .034 62HD 64HD 67HD 69HD CHART 2 9000...
  • Page 4: Parts List

    Page 4 SB-2-252-J PARTS LIST Ref. Replacement Individual Part No. Description Parts Required See Chart 2 Air Cap/Retaining Ring MBC-368 Retaining Ring See Chart 2 Air Cap Less Retaining Ring See Chart 3 Fluid Tip GTI-33-K5 Seal Kit (Kit of 5) GTI-425 Baffle Assembly MSV-3-K10...
  • Page 5 SB-2-252-J Page 5 See GTI-33 Baffle Seal Replacement Instructions on Page 4. Torque to 12-15 ft. lbs. Torque to 20-25 ft. lbs. Fluid Inlet Nipple 3/8 NPS (M) * 24 Air Inlet Nipple 1/4 NPS (M) Torque to 15 ft. lbs. Detail Ref.
  • Page 6: Troubleshooting

    Page 6 SB-2-252-J TROUBLESHOOTING CONDITION CAUSE CORRECTION Heavy top or Horn holes plugged. Clean. Ream with non-metallic point. bottom pattern Obstruction on top or bottom of fluid tip. Clean. Cap and/or tip seat dirty. Clean. Heavy right or left side Left or right side horn holes plugged.
  • Page 7 SB-2-252-J Page 7 TROUBLESHOOTING (continued) CONDITION CAUSE CORRECTION Fluid leaking or dripping Packing nut too tight. Adjust from front of pressure feed gun Dry packing. Lubricate. Fluid tip or needle worn or damaged. Replace tip and needle with lapped sets. Foreign matter in tip.
  • Page 8: Warranty

    No water is needed. WARRANTY This product is covered by DeVilbiss' 1 Year Limited Warranty. DeVilbiss Worldwide Sales and Service Listing: ITW Industrial Finishing DeVilbiss has authorized distributors throughout the world. For technical assistance or the distributor nearest you, see listing below.