1. Remove the actuator. Refer to Section 6.5 for the hydraulic actuator or Section 6.6 for the
pneumatic actuator.
2. Clean the manifold bushing cap to provide a clean surface.
3. Use the Unify Stem Removal tool (HPN 6700292) to slide the stem adapter over the valve
stem head. Make sure that the removal tool assembly is sitting squarely on the manifold
bushing cap.
NOTE:
Husky recommends that the stack be heated with the nozzle heater and or manifold to soften the
resin.
CAUTION!
Mechanical hazard - risk of damage to the valve stem. Do not use a slide hammer when
removing the valve stem.
4. Remove the valve stem.
6.9.2
Installing a Valve Stem
To install a valve stem, do the following:
1. Make sure all components are clean and free of resin, scratches, nicks or burrs. Replace
components if required.
NOTE:
Husky recommends that the stack be heated with the nozzle heater and or manifold to soften the
resin.
2. Carefully insert the valve stem assemblies into the manifold bushing cap. Make sure the
pistons are seated below the top surface of the cylinders.
6.10
Removing and Installing Nozzle Heaters
The following procedures describe how to remove and install nozzle heaters. The following types
of nozzle heaters are supported:
IMPORTANT!
Husky nozzle heaters are rugged and have a long service life. Only replace nozzle heaters with
Husky approved parts. Use of components not sold or approved by Husky will void the hot runner
warranty.
• Ultra Nozzle Heaters (UNH) for U750 systems
Hot Runner Installation Manual v 2.2 — March 2021 Maintenance
Removing and Installing Valve Stems 79
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