Repair and rapid help: Remove fully reacted cartridges from the HB 720 K

15. Februar 2024 Tim Charzinski Service Kommentar hinterlassen

A guide to efficient problem solving

“Oh, just those few drops!” is what some people think when removing cartridges from the HB 720 K devices. But this idea can be costly when it comes to hot-melt adhesives, which, as we know, does not make any difference whether it spreads in the handheld device or lands on the substrate to be bonded. For this reason, contamination of the device with reactive PUR/POR adhesives must be avoided at all costs. Heavier or more frequent contamination can lead to the destruction of the manual application device.

There is, however, a simple trick to avoid damage: Hold the device with the cartridge to be removed upside down for a moment before removing it! If there is a small residue of hot-melt adhesive in the nozzle, it will flow back out of the device into the cartridge. When removing the cartridge, continue to hold the device upside down so that the cartridge can be safely removed from the coated tank.

Removing old cartridges made easy

However, if the reactive adhesive has leaked into the tank and reacted there, it will sit tighter in the tank. A quick repair is necessary here, and this is what you need:

a 3.0 Allen key
a small hammer
a small screwdriver
a replacement nozzle

Unscrew the nozzle. Carefully remove the O-ring LDN0123 with the help of a screwdriver.
Pull the plastic cap (bead cap H219003) off the nozzle kit.
Then loosen the two screws KDN0728 on the nozzle kit. This can then be pulled out as a single unit.
The neck of the cartridge is now visible. Lightly tap the cartridge opening with the hammer. In this way, you release the cartridge to be removed from the tank.
The cartridge can now be removed using the cartridge pliers. Remove the remaining adhesive residue from the coated tank with a wooden spatula. If necessary, replace the complete nozzle kit, as the fully reacted adhesive can be everywhere. Reassemble the device in reverse order. Do not use the old nozzle, but insert a new one instead.