Loctite Hysol 175-SPRAY, Operation Manual, Page: 7 / 14

Page 6
7 Troubleshooting
Before proceeding with any repair or maintenance operation disconnect the tool
from the main electricity supply.
Glue “Backup” and “Meltdown”
“Backup” occurs when hot molten adhesive in the glue chamber is forced back
between the barrel wall and the outside surface of the adhesive cartridge and piston.
Once this adhesive cools, it may lock the adhesive cartridge in the barrel, preventing,
or at least restricting, normal extrusion. By far the most likely cause of backup is
allowing insufficient warm-up time before operating the tool (the molten glue in the glue
chamber cannot escape forwards because the nozzle is blocked, due to being
insufficiently warm). In the vast majority of cases the backup self-clears once the tool,
having fully reached operating temperature, is operated again. For the rare occasions
where the backup does not self-clear, turn the spray air adjuster fully clockwise; this
will switch off the spray air, allowing the full pneumatic line pressure to be applied to
the piston (the tool will operate as a bead tool).
"Meltdown" occurs when the rear of the adhesive cartridge softens to the extent that it
is not rigid enough to drive the cartridge forward without collapsing. As with backup,
the molten adhesive can solidify, potentially locking the cartridge and / or piston into
the barrel. Meltdown is caused by leaving the tool switched on for extended periods of
time without operating it. It is recommended that, if the tool is to be left standing for
forty minutes or more, it should be switched off and only switched back on when
preparing to use it again.
The Loctite
®
Hysol
®
175-SPRAY and 175-SPRAY-HT tools are fitted with specially
coated pistons which have non-stick characteristics far superior to any PTFE coating;
this minimises the effect of any backup or meltdown, should it occur.
FOR ANY REPAIRS OR ADJUSTMENTS – OTHER THAN THOSE DETAILED IN
THIS MANUAL – PLEASE CONTACT 1-800-LOCTITE (562-8483).
8 Care and Maintenance
Every attempt has been made to make this exceptionally powerful tool both reliable
and trouble-free. However the following precautions should be noted:
•
Make sure that the applicator is up to temperature before attempting to operate.
•
Do not leave the applicator switched on for long periods without use. If the
applicator is not to be used for forty minutes or more, switch it off and restart when
required.
•
Keep the applicator upright when not in use, never lay it on its side. Always use the
stand provided, or the optional bench stand or suspension unit (see Accessory and
Spare Parts Lists at the end of this manual).
•
Do not use excessive force on the trigger. Ensure that the tool has fully warmed up
before use.
•
Keep the nozzle clean to prevent adhesive build-up. This is easily done by wiping
the nozzle with clean paper or cloth while the nozzle is still warm.