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Troubleshooting
Problem
Low or no adhesive flow
No heat
Dripping Nozzle
10
Probable Cause
(In order of priority)
1. Hung adhesive stick
2. Low air pressure
3. No electricity
4. Dirty nozzle valve assembly
5. Regulator malfunction
6. Burned out heater(s)
7. Jammed slugs
1. Blown thermal cutoff
1. Regulator malfunction
2. Expanded adhesive stick
3. Worn nozzle valve
Correction
Turn on the 3M™ Hot Melt Applicator PG II and allow
it to heat for at least 60 minutes. With incoming air at
80 psi (551 kPa) extrude adhesive. If unsuccessful remove
nozzle assembly and extrude one stick of adhesive. Readjust
incoming air to 80 psi (551 kPa).
Check to see if there is sufficient air pressure. Test by setting
pressure at 80 psi (551 kPa). Check in-line filter to ensure that
it is not plugged with contaminants. Disconnect in-line filter
from air hose. Using a compressed air line, blow compressed
air through the filter in the reverse flow position. If this does
not increase air flow through the filter, swivel filter should
be replaced.
Check to see that electrical service is live, and that lighted
switch is in "on" position.
Remove nozzle valve and clean. Run one adhesive stick out.
Replace cleaned valve assembly.
Squeeze trigger and try to pull retract knobs. If they can be
pulled back easily, install new regulator kit.
With Volt/Ohm Meter, run electrical continuity check on each
heater (see page 15 for procedure). If open circuit exists, install
new heater kit.
If the piston is retracted before reaching the point where the
whistle is heard, a jam-up of the adhesive may occur. To free
this, simply retract the piston fully and roll the applicator to
one side so that the adhesive in the magazine will free itself.
Now push the knobs forward until the adhesive stick still in the
chamber is contacted by the piston. Roll the applicator back to
its normal operating position and continue extruding adhesive
until the whistle is heard or until the piston has traveled its full
length as indicated by the orange retract knobs.
Replace with new Thermostat/TCO kit. Refer to page 16,
procedure paragraph I.
With finger off of trigger, attempt to retract piston. If piston is
very difficult to pull back, air regulator may not be shutting off
entirely. Replace regulator.
Extrude one adhesive stick.
Replace with new nozzle valve assembly. Refer to page 14,
procedure paragraph C.
© 3M 2020.
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