© 3M 2006
10
Troubleshooting
Problem
Probable Cause
Correction
(In order of priority)
Low or no adhesive flow (cont.)
6. Burned out heater(s)
With Volt/Ohm Meter, run electrical
continuity check on each heater (see
page 17 for repair procedure). If open
circuit exists, install new heater kit.
Caution
Disconnect air and electrical power
and make sure applicator is at room
temperature before servicing 3M™
Scotch-Weld™ Hot Melt Applicator
PG II LT. Failure to disconnect air
and electrical power before servicing
may cause electrical shock or
damage to the applicator.
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 18, paragraph J.
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,
paragraph C.
!
7. Jammed adhesive sticks
1. Blown thermal cutoff
1. Regulator malfunction
2. Expanded adhesive stick
3. Worn nozzle valve
No heat
Dripping Nozzle
