10
Maintenance of the ZD-985
Changing the Tip
Make certain that the gun is cool before attempting to change tips. When under
power all the metal parts associated with the tip of the gun become dangerously
hot and can create serious injury. Once the gun has cooled to room temperature
unscrew the knurled finger nut near the base of the heater element. If it is too
tight for manual removal gently use a plier. This retaining nut has standard right
hand threads. Once the nut is loose, pull the tip retention Outer Sheath forward
to uncover the Tip and Heater Element. Be aware that there is a secondary sheath
that covers the heater element and may also come off with the Outer Sheath and
the Tip. See Figure 3. The Inner Sheath must be placed back on the Heater
Element before the Tip is re-installed. If the Tip is still on the front of the heater
the inner sheath is still in place as it will not slide over the Tip. Pull the Tip off the
Heater Element and vacuum tube. Use your fingers or a soft tool to do this. The
Tip is precision and the use of pliers or other hard tools may damage its surface or
its seal with the heater element. Push the new Tip onto the vacuum tube and seat
it securely against the heater element. Slide the Outer Sheath and Knurled Nut
over the Tip and Heater Element and finger tighten the nut. You can tighten this
as much as you can with your fingers. It is not uncommon for this nut to loosen
with time due to the heating and cooling of the gun from one use to another. It is
recommended that the tightness be checked before each use and prior to turning
the unit on. Do Not use a pliers to over tighten the nut.
Figure 3
