9727 datasheet(12/26 Pages) 3M

12 / 26 page

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

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