Troubleshooting - 3M Scotch-Weld LT Manual Del Propietário

Troubleshooting

Problem Probable Cause
1. Low or no No heat
adhesive flow
Shutdown procedure was not observed
Plugged tip
Backmelt
2. Dripping* Nozzle Backmelt
Worn Valve Assembly
Contaminated adhesive
*Thermal expansion may cause some dripping during start-up. This is normal.
Correction
Check to see that 120 VAC service is on. Thermal fuse in the
thermostat may have blown. Use Repair Kit #9262.
Allow the applicator to heat up for at least 30 minutes.
If the applicator was left on overnight, the tip may be plugged.
This may block adhesive flow and cause backmelt. CAUTION:
Do not force adhesive. Clear the tip with a small nail or paper
clip. Extrude the remaining adhesive stick and one new
adhesive stick to clear the opening.
Remove the clip and feeder from the track of the applicator.
Push the existing adhesive stick into the white sleeve
approximately 3/4'' with a new adhesive stick. Remove the new
adhesive stick before it melts and look into the white sleeve.
Look for a thin skin of adhesive around the inside of the white
sleeve. Scrape this skin toward the heat block. CAUTION: Do
not damage the white sleeve. Extrude one adhesive stick to
clear the sleeve.
TO AVOID BACKMELT: Observe the Start-Up and Shut-Down
procedures. Do not force adhesive through the applicator.
Refer to preceding paragraph on backmelt.
Replace valve with Repair Kit #9234
Keep adhesive clean and free of contamination.