Troubleshooting - Graco Pneumatic PD44 Instructions Manual
Patented meter, mix and dispense valve for precise two-component micro-dispensing.
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Also See for Pneumatic PD44:
- Setup and operation (48 pages) ,
- Operation & maintenance manual (42 pages) ,
- Operations & parts list (42 pages)
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Troubleshooting
Troubleshooting
Problem
PosiDot stalling and no material
being PosiDoted despite adequate
input pressure.
PosiDots not discharging normal or
full volume.
Partially unmixed material through
cycle.
Material leaks past spool valves.
Material leaks around mixer while
dispensing
18
Cause
Blocked mixer.
Flow control valve closed.
Low material level in reservoirs.
Air in material tanks.
Motionless Mixer (after satisfactory startup)
Mixer not clean or free.
Spool valve worn or damaged.
Cured material in mixer.
Solution
Check mixer for cured material,
replace mixer as required.
Open.
Fill material reservoirs and prime the
machine
Fill reservoirs and prime machine.
Remove and replace the mixer.
Replace the spool valve and sleeve.
Check mixer for cured material,
replace mixer.
313904B
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