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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 valve
Spool will not actuate
Schematics
For standard machines, the schematics will be
included in the 4104A Parts manual.
For custom machines, the schematics will be included
in the assembly drawings manual.
3A0231E
Cause
Blocked needle
Flow control valve closed
Low material level in reservoirs
Air in material tank
Spool valve worn or damaged
Low air pressure
Cured material on spool
Seals are worn
Troubleshooting
Solution
Check needle for cured material,
replace as required
Open needle
Fill material reservoirs and prime the
machine
Fill reservoir and prime machine
Replace the spool valve
Increase air pressure to approxi-
mately 20-30 psi
Check spool for cured material,
replace as required
Replace seals
17
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