Repair
311320K
21
Install Fluid Head Component
NOTE:
All gun block parts must be clean and free of
damage before installation.
1. Remove felt wiper assembly from rear of mixing
chamber.
2. Ensure internal mixing chamber parts are in place.
3. Insert chamber into gun block. Align keyway in
chamber with pin protruding from top of hole in
block.
4. Press chamber into block so that flange is 1/32 -
1/16 in. above face of gun block.
5. Thread felt wiper assembly into back of mixing
chamber. Do not tighten.
NOTE:
Failure to install felt wiper in rear of chamber
allows internal chamber parts to fall out when chamber
is tapped into place.
6. With rear of gun block facing palm of your hand,
place mixing chamber insertion block over nose of
chamber so it rests squarely on the chamber flange.
Firmly tap insertion block with hammer until flange
of chamber is flush with face of gun block (F
7. With o-ring in place on underside of gun frame,
assemble block to frame.
8. Install valving rod assembly. If using new felt wiper,
push valving rod through felt with retainer case off
chamber. Remove felt wiper and any felt buildup on
tip of rod. Install wiper, hand tighten into rear of
chamber in gun block. Then insert valving rod
through piston in air cylinder, guiding it through
center of felt wiper retainer. Use firm pressure to
carefully push valving rod into mixing chamber until
piston of air cylinder bottoms out.
9. Check valving rod clearance. If it does not extend
approximately 1/32 in. (1mm) beyond tip of mixing
chamber, see
Valving Rod Adjustment
, page 20.
10. Replace valving rod spring and spring retainer case.
Grasp knob, push in, and turn clockwise to lock in
place.
11. Replace air cap.
12. Replace check valves and screen screw assembly.
13. Replace closure screw in top of gun block.
14. Mount gun onto coupling block.
15. Connect air supply to gun.
16. Adjust felt wiper and soak felt with gun cleaner.
17. Close manual valves and press trigger several
times to ensure valving rod moves freely.
F
IG
. 25 Mixing Chamber Insertion
F
IG
. 26 Chamber Positioning
1/32 in.
1/16 in.
F
IG
. 27 Chamber Seating
Chamber Insertion Block
