Graco PR70 Operation & Maintenance Manual page 29

7. Adjust Phasing.
303
302
301
Key:
301 Piston Shaft
302 Locking Nut
303 Phase Adjustment Screw
a. Watch the dispense valve carefully to observe
which material is dispensed first. Press the
cycle start button or the footswitch to dispense
material.
b. If the materials does not exit the dispense valve
at the same time adjust the piston Phase
Adjustment Screw (303) as follows.
• If the A side material exits the dispense nozzle
before the B side material:
a. Use two 13 mm wrenches to break loose
the locking nut (302) from the phase adjust-
ment screw (303) on the B material side.
b. Hold the phase adjustment screw (303) sta-
tionary with a 13 mm wrench.
c. Use a 7 mm wrench to turn the piston
shaft (301) counterclockwise 1/4 turn or
less to move the B piston forward.
334116D
• If the B side material exits the dispense nozzle
before the A side material:
a. Use two 13 mm wrenches to break loose
b.
c.
NOTE: It is highly recommended that all of the phasing
adjustment be done to one side or the other; not both.
NOTE: Ensure the piston shaft and phase adjustment
screw do not rotate while tightening the locking
nut (302) in the following step.
ti12389a
c. Hold piston shaft (301) and phase adjustment
screw (303) in place with a 7 mm and 13 mm
wrench and tighten locking nut (302) against
phase adjustment screw with a 13 mm wrench.
d. Watch the dispense valve carefully to observe
which material is dispensed first. Press the
cycle start button or the foot switch to dispense
material. If one material exits the dispense noz-
zle before the other, go back to step b.
the locking nut (302) from the phase adjust-
ment screw (303) on the A material side.
Hold the phase adjustment screw (303) sta-
tionary with a 13 mm wrench.
Use a 7 mm wrench to turn the piston
shaft (301) counterclockwise 1/4 turn or
less to move the A piston forward.
Setup
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