CAUTION!
Mechanical hazard – risk of equipment damage. Do not allow molten resin to drop on
nozzle tip insulators while the insulators are being removed. The additional material will
increase the calculated preload for the nozzle tip insulator and damage the hot runner
during assembly with the cavity plate.
Make sure all nozzle tip insulators are clean during removal and installation.
4. Remove the nozzle tip insulators from the nozzle tips using needle nose pliers. Be careful not
to damage the nozzle tips or sealing surfaces.
5. If a nozzle tip insulator is found in the gate detail in the cavity plate, remove the nozzle tip
insulator using a 10 mm or 3/8”‑18 NPT tap or pipe and then clean the gate.
Clean the gate detail using a pointed hardwood stick and soft cloth, or a Scotch‑Brite No.
7447 (Maroon). Care must be taken not to scratch the cylindrical sealing surfaces between
the gate insert and nozzle housing. Even a slight scratch may cause leaks at high injection
pressures.
6. Inspect the nozzle tip insulators for resin. If resin is found, the nozzle tip insulator is leaking
and will not function as required.
Determine the following:
• The cause of the leak by inspecting the gate insert dimensions.
• The nozzle tip position to make sure it is correct before a new insulator is installed.
7. Remove all locks and tags.
6.19.2
Installing Nozzle Tip Insulators
To install nozzle tip insulators, do the following:
IMPORTANT!
Due to geometric variations between the gate details and the witness marks left in the nozzle tip
insulators by the nozzle tips, Husky does not recommend reusing nozzle tip insulators. Previously
used nozzle tip insulators should always be replaced with new nozzle tip insulators. If reuse is
absolutely necessary (For example, unscheduled maintenance with no spares on hand), order
new nozzle tip insulators and replace as soon as possible. Contact your nearest Husky Regional
Service and Sales Oce or www.husky.co.
CAUTION!
Mechanical hazard – risk of damage to the hot runner. Make sure all nozzle tip insulators
are clean before they are installed. Any additional material on the nozzle tip insulator will
increase the calculated preload and damage the hot runner during assembly with the
cavity plate.
Hot Runner Installation Manual v 2.2 — March 2021 Maintenance
Removing and Installing Nozzle Tip Insulators (If Equipped) 119
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