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Parts Replacement - DeVilbiss JGA-510-98FX Service Manual

Pressure feed high volume low pressure spray gun
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SPRAY GUN LUBRICATION (Cont'd)
A.
Trigger Points
B.
Packing
C.
Adjusting Valves
D.
Baffle Threads
E.
Air Valve Cartridge
A
D
B
E

PARTS REPLACEMENT

Note
When replacing the fluid tip or
fluid needle, replace both at the
same time. Using worn parts can
cause fluid leakage. Lapped sets
are available for most pressure feed
combinations. See Chart 1. Lapped
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 reas-
sembling. Torque to 20-25 ft.lbs.
To prevent damage to the fluid tip
(3) or fluid needle (32), 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.
FLUID INLET GASKET (6)
REPLACEMENT INSTRUCTIONS
1. Remove fluid inlet adapter (8) with
appropriate wrench.
2. Clean Loctite from gun body inlet
threads and seal area.
3. Place gasket (6) squarely onto the fluid
inlet adapter and push it down until it
is flat against the shoulder.
4. Place a couple of drops of QH-130
(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.
SB-2-187-H (6/2015)
Maximum air pressure required to
assure compliance of 10 psi Max.
Cap Pressure – this reading must
be taken at the spray gun handle
inlet fitting.
C
Figure 1 Baffle
Air cap number located on face of
cap – cap number must correspond
with baffle number to assure 10 psi
cap pressure.
Chart 1
Fluid Tip and Needle (Matched Set)
400 Gr. S.S. Tip/303 S.S. Needle
AV-2115-FX Tip (.042")
JGA-402-FX Needle
300 Gr. S.S. Tip with U.H.M.W.
Poly. Insert / 303 S.S. Needle (optional)
AV-4915-FX Tip (.042")
JGA-402-FX Needle
DISASSEMBLY INSTRUCTIONS –
NEW BAFFLE ASSEMBLY
The baffle design incorporates a tight,
press fit with the fluid tip, assuring a
positive air seal. With this design, the
baffle may pull away from the gun body
when the tip is removed and stay locked
onto the fluid tip. If this occurs, follow the
instructions below.
A bench vise should be used for
convenience and to avoid damage
to the spray gun.
1. Secure the spray gun in a bench vise
with padded jaws, or use a rag to avoid
scratching the gun body.
2. Using a 1/2" socket, loosen the fluid tip
three (3) turns only, which will leave
about a 1/16" gap between the baffle
gasket and gun body. See Figure 2. Do
not loosen the fluid tip more than three
(3) turns, as damage may occur.
Figure 2
30
98
3. Place a 1" socket (12 pt.) over the fluid
tip so that it rests on the top surface of
the baffle. See Figure 3.
4. Press downward on the socket with
sufficient force to free the baffle from
the tip. See Figure 3.
5. The fluid tip and baffle can now be
removed normally from the gun.
(Standard)
Figure 3
Note
3 / 8
Loosen fluid tip
3 turns only.
Fluid Tip
Baffle
1/16" gap
Baffle
(approx.)
Gasket
Bench
Vise
Press Down
1" Socket
(12 pt.)
EN

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