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DeVilbiss JGA-504 Service Bulletin page 3

Conventional spray gun
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SPRAY GUN LUBRICATION
Daily, apply a drop of SSL-10* spray gun
lube at trigger bearing stud (28) and the
stem of air valve (20) where it enters air
valve assembly. The shank of fluid needle
(11) where it enters packing nut (9) should
also be oiled. Fluid needle packing (8)
should be lubricated periodically. Make
sure baffle (6) and retaining ring (3) 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. Fluid needle spring (14) and air
valve spring (19) 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.
* Not for air tools or high RPM equipment.
A.
Trigger Points
B.
Packing
C.
Adjusting Knobs
D.
Baffle Threads
E.
Air Valve Cartridge
D
B
E
PARTS REPLACEMENT
FLUID INLET GASKET (32)
REPLACEMENT INSTUCTIONS
1.
Remove fluid inlet adapter (34) with
appropriate wrench.
2.
Clean Loctite from gun body inlet
threads and seal area.
3.
Place gasket (32) squarely onto the
fluid inlet adapter and push it down
until it is flat against the shoulder.
4.
Use medium strength thread sealant
(i.e. Devcon 2242 blue, or equal) on
threads before installing fluid inlet
adapter.
5.
Torque fluid inlet adapter to 20-25 ft.
lbs. and tighten locknut.
Chart 1
Air Caps, Fluid Tips, Fluid Needles and Applications
No. on
Air Cap
Order
No.
80
9000
AV-440-9000
765
777
Chart 2
Fluid Tips Available
Tip Size
in.
mm
0.039
1.0
0.047
1.2
0.055
1.4
0.063
1.6
0.070
1.8
A
PARTS REPLACEMENT
Figure 1 Air Cap
C
GTI-33 Baffle Seal Replacement
1. Remove Fluid Tip (5).
2. Remove Baffle (6).
3. Remove Seal (7) from baffle.
The seal is designed to be a tight
fit on the baffle. The seal should
be able to be removed using
your fingers. If you are unable
to remove the seal using your
fingers, insert a small screw-
driver between the outer lip and
the back of the baffle and pry
the seal off.
Pry here if
necessary
Air Cap
Type of
With Ring
Fluid
(Ref. No. 4)
Delivery
MB-4039-80
SUCTION
SUCTION
OR
PRESSURE
AV-440-765
PRESSURE
AV-440-777
PRESSURE
Fluid Tip
Type of Fluid
(Ref. No. 5)
Delivery
AV-213-10
Pressure Feed
AV-213-12
Pressure Feed
AV-213-14
Pressure Feed
AV-213-16
Suction Feed
AV-213-18
Suction Feed
Air Cap No.
N
o
XX
DeVilbiss
NOTE
ANGLED SIDE
SEAL
THICK SIDE
BAFFLE
SB-2-259-B
Suction Feed
Pressure Feed
Fluid
Fluid Tips
Needle
Used
Needle
(Ref. No. 11)
(Ref. No. 5)
(Ref. No. 11)
AV-213-16
GTI-413
OR
AV-213-18
AV-213-16
OR
GTI-413
GTI-449-12
AV-213-18
GTI-449-12 AV-213-12
GTI-449-12 AV-213-14
4. Assemble seal to baffle with angled
side up as shown in diagram. NOTE:
The seal should be a tight fit on the
baffle. If it is a loose fit on the baffle,
assure that it is assembled with the
angled side up.
5. Install baffle on gun.
6. Install fluid tip (5) and tighten to
15-20 ft-lbs.
JGA-4035 Packing Replacement
Instructions
Gun Body
Packing
(3 pieces)
1. Remove adjusting knob and needle
spring from gun.
2. Partially withdraw needle from gun
body.
3. Loosen packing nut and remove.
4. Remove old packing.
5. Assemble packing nut to needle.
6. Assemble packing in order shown
to needle.
7. Insert needle all the way into gun
body seating in tip.
8. Install needle spring and adjusting
knob.
9. Thread packing nut into gun body.
10. Tighten packing nut in equal
increments - no more than
1/6 turn at a time.
11. After each adjustment, pull needle
open and observe needle closure.
12. If needle snaps shut, continue
adjusting nut until there is evidence
of needle bind or slow closing.
13. Back off packing nut 1/12 turn to the
point where needle snaps shut.
Packing nut must remain tight
enough to prevent loosening by
hand.
14. Pull needle several times to verify
needle snaps shut and check
packing nut for looseness.
Page 3
Fluid
Fluid Tips
Used
(Ref. No. 5)
AV-213-10
OR
AV-213-12
Needle
Packing
Nut

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