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Troubleshooting
18 332089B
Troubleshooting
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.
Perform Pressure Relief Procedure before perform-
ing any troubleshooting procedure.
Problem Cause Solution
Metering valve stalling and no mate-
rial being dispensed despite ade-
quate input pressure
Blocked needle Check needle for cured material,
replace as required
Flow control valve closed Open needle
Metering valve not discharging nor-
mal or full volume
Low material level in reservoirs Fill material reservoirs and prime the
machine
Air in material tank Fill reservoir and prime machine
Material leaks past spool valve Spool valve worn or damaged Replace the spool valve
Spool will not actuate Low air pressure Increase air pressure to approxi-
mately 20-30 psi
Cured material on spool Check spool for cured material,
replace as required
Seals are worn Replace seals