Spray Head Seal - DeVilbiss JGA PRO Series Technical Bulletin

Parts Replacement/
Maintenance

SPRAY HEAD SEAL

REPLACEMENT
1. Remove air cap and retaining ring. (See fig 37)
2. Remove fluid adjusting knob, spring, and spring pad.
(See figs 38 & 39)
3. Remove fluid needle from gun body. (See fig 40)
4. Remove fluid nozzle using SN-28 (10 mm) ring
Spanner, and then remove the Front Plate. (See figs
41, 42 & 43)
5. Remove Spray Head. (See fig 44).
6. Clean Spray Head with a soft brush (See fig 45).
7. Remove Spray Head seal using a small screwdriver or
pick. (See fig 46)
8. Clean front of gun if required, using a soft brush, as well
as the Spray Head, fluid nozzle, air cap, and retaining
ring. (See fig 47)
9. Place a new Spray Head Seal onto the front of the gun,
making sure the flat on the seal is aligned with the flat
in the gun. (See fig 48).
10. Fit the Front Plate onto the Spray Head, fit Spray Head
to the Gunbody, ensuring the flat on the underside of
the Spray Head locates with the flat in the Gun Body.
Fit Fluid Nozzle, Air Cap, and Retaining Ring. Torque
the Fluid Nozzle to 18–20 nm. Don't over torque the
fluid nozzle. (See figs 44, 43, 42, 41 and 37)
11. Insert Fluid Needle all the way into the Gun Body,
seating in the Fluid Nozzle. (See fig 40)
12. Reassemble Needle Spring, Spring Pad, and Fluid
adjusting Knob. (See figs 39 & 38)
13. Trigger gun fully and screw in Fluid Adjusting Knob until
it stops. Back it off 1/2 turn and gun will have full needle
travel.
14. Trigger gun several times to verify correct operation
12
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