Graco Pneumatic PR70, Instructions Manual

Page: 12 / 34

Setup
12 313937A
Dry Run
A dry run demonstrates the machine’s controls and dis-
pensing steps. It also verifies that the machine is work-
ing correctly before you load materials.
1. Place emergency stop in the out position.
2. Set all switches to RETRACT or OFF, and close all
ball valves.
3. Close all other valves within feed system.
4. Set PUMP MODE to SHOT.
5. Set the Stroke Adjust proximity switch to full stroke.
See the Adjust the Dispense Valve Switch section
on page 11.
6. Adjust air pressure to 30 psi.
7. Press and hold the start device.
8. Release the start device. Cycling will end.
9. Press and hold the start device.
10. Push the Emergency Stop.
11. Release the start device.
12. Pull the Emergency Stop out to reset.
13. Set Pump Mode to RETRACT.
14. Set Pump Mode to CONT then press and release
the start device. Machine will cycle continuously.
15. Set Pump Mode to RETRACT. Machine will stop in
retracted position.
Prime the Dispense Head
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.
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.
There will be a short delay after power is reapplied
and before the air cylinder and pumps retract.
SHOT
PUMP MODE
RETRACT CONT.
AUTO
DV MODE
CLOSE OPEN
STOP
If the machine is in the middle of a cycle, it will
retract immediately without completing the cycle.
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
IG
. 4.
F
IG
. 4: Prime Dispense Head
102
ti12391a
102a