Dannmar DT-50, Installation And Operation Manual

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DT-50 and DT-50A Tire Changer
37
P/N 5900260 — Rev. A1 — Dec. 2020
About Valve Stems
The following drawing shows a Valve Stem and its components.
• When demounting a Tire . Taking out the Valve Core lets the air out of the Tire, which
must
be done before you can demount a Tire.
⚠
DANGER It is dangerous to do any service on a Tire if there is air still in it.
Use a Valve Core Tool to remove a Valve Core. Don’t risk damaging the core or stem by using the
wrong tool.
• When to replace the entire Valve
Stem
. Valve Stems are normally replaced when you
mount a new Tire on a Wheel.
When mounting a new Tire, Dannmar recommends installing a new Valve Stem, but it is not
required. The process for replacing a Valve Stem is to cut out or pull out the old Valve Stem, then
install the new Valve Stem. This should be done after the old Tire has been demounted but before
the new Tire is mounted.
Use a Valve Stem Installer/Remover Tool (sometimes called a Valve Stem Puller/Remover Tool) that
can be used to both remove an old Valve Stem and install a new Valve Stem.
This tool is
not
the same tool as the Valve Core Tool.
•
When inflating a Tire
. Before starting the first stage of inflating a Tire (sealing the Beads),
remove the Valve Core. Make sure to keep it . Removing the Valve Core allows air to move
more easily into the Tire.
Once the
second stage of inflating a Tire (seating the Beads) is complete , put the Valve Core back
in.
The first two stages, sealing and seating the Beads, do not require too much air pressure. The
third stage, inflating the Tire, does. Have the replacement Valve Core close at hand for the inflation
stage, as that will keep too much air from coming back out of the Tire.
You will need to check and inflate the Tire to the correct pressure once the replacement valve core
is installed.