Troubleshooting; Schematics - Graco PD44 Operation & Maintenance Manual

Troubleshooting

Troubleshooting
Perform Pressure Relief Procedure before perform-
ing any troubleshooting procedure.
Problem
Metering valve stalling and no mate-
rial being dispensed despite ade-
quate input pressure
Metering valve not discharging nor-
mal or full volume
Material leaks past spool valves
Improper material mixing
Material leaks around mixer while
dispensing

Schematics

For standard machines, the schematics will be
included in the PD44 Parts manual. See Related Manu-
als on page 3.
For custom machines, the schematics will be included
in the assembly drawings manual.
26
Cause
Blocked mixer
Flow control valve closed
Low material level in reservoirs
Air in material tanks
Spool valve worn or damaged
Mixer not clean or free
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
Replace the spool valve and sleeve
Remove and replace the mixer
Check mixer for cured material,
replace mixer
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