Graco Pneumatic PR70 Instructions Manual page 21

For accurate metering, mixing, and dispensing of two-component materials
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Install Adjustment Screw/Cap
8. Loosely install hex nut (100b) and adjustment
cap (100d) onto the air cylinder shaft (420).
Adjust the Adjustment Screw/Cap
9. Push the drive block forward until resistance is felt
when it engages the cylinder. Make sure the resis-
tance is not due to shock absorber contact with the
adjustment screw or adjustment cap (100d).
10. Adjust the adjustment screw or adjustment cap until
it contacts the shock absorber.
11. Hold the adjustment cap (100d) in place and tighten
the hex nut (100b) against the adjustment cap.
Prepare Machine for Operation
12. Lift the system air pressure relief switch to enable
system pressure. It is the yellow tab at the left, rear
of the machine.
Adjust Shock Resistance
13. Execute a shot to see how the shock absorber
affects the speed of the drive block.
14. The shock absorber has a numeric scale on one
side. Rotate the knob with the scale to a higher
value for more resistance. Rotate the knob to a
lower value for less resistance.
15. Repeat these steps until the desired resistance is
achieved.
313937A
Repair
21

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Sn8050

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