Prime The Dispense Head - Graco PR70 Operation & Maintenance Manual

Setup

Prime the Dispense Head

CAUTION
If the dispense head is not primed, chemical cross-
over may occur resulting in cured material in the dis-
pense head, hoses, and/or pumps.
See F . 24.
IG
1. Remove static mixer from the dispense head (102)
if installed.
2. Turn snuff-back adjustment knob (103) fully clock-
wise. This will prevent the dispense valve from clos-
ing between priming shots.
3. Use a 4 mm hex key to loosen the screws (102a)
holding the dispense head in place.
4. Rotate dispense head (102) so the tip is above the
fluid input hoses.
102
102a
F . 24: Prime Dispense Head
IG
5. Use a 4 mm hex key to tighten screws (102a) hold-
ing dispense head in place.
6. Route the fluid hoses connected to the dispense
head so they are always below the dispense head.
This ensures any air in the hoses will travel to the
dispense head.
7. Navigate to the Home Screen. See Screen Naviga-
tion Diagram, page 17.
40
8. Select a large size shot.
9. Hold a waste container at the end of the dispense
10. Repeat the previous step until no air comes out of
11. If phasing adjustments and ratio checking are not
12. Use a 4 mm hex key to loosen screws (102a) hold-
13. Rotate dispense head back to normal dispensing
ti12391a
14. Use a 4 mm hex key to tighten the screws (102a)
15. Adjust snuff back to proper setting for operation.
head (102) and press the Start/Stop Shot button
( ) or the footswitch.
the dispense valve.
required, use the following procedure to attach the
static mixer.
a. Attach the static mixer with the dispense head
pointed up.
b. Hold waste container at end of dispense
head (102) and press the Start/Stop Shot button
( ) or the footswitch.
c. Repeat the previous steps until static mixer has
been purged of air.
ing dispense head in place.
position.
holding the dispense head in place.
See Adjust Dispense Valve Snuff Back on
page 43.
312759W