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TyrFil Flushless Pump
| Flatproofi ng Technical Manual
VI. MISCELLANEOUS
Bias Tires with Tubes (under 12 ply)
Tires in this category can be fl atproofed in the same manner as fi lling a tubeless tire with one exception, never
allow the pressure to drop to less than 30% of the fi nal pressure.
Tires with Tubes (12 ply and above or radial)
These tires require some extra precautions but are not diffi cult to fl atproof if the following procedures are
used. A pilot hole must be made in the tire to make the insertion of the needle easier. Care must be taken not
to damage the tube when drilling the tire. It is the needle that should puncture the tube, not the drill bit. Below
are three methods that you can use:
Method 1:
If the tire and tube are mounted and pre-drilling is required (12 ply or greater/radial tire) a vacuum
must be applied to the tube with a tube defl ator before the tire can be safely drilled. This will prevent the
tube from being torn by the drill bit. When the tube is defl ated, drill a pilot hole at the 12 o’clock position in
the tread groove. After drilling the hole, the tube must be expanded before fl atproofi ng. To do this, replace
the valve core and infl ate the tube. This step will ensure that the tube will fi ll properly. The tire can now be
fl atproofed. Follow fl atproofi ng guidelines for a regular tube-type tire.
It is recommended that the Flatproofi ng Technician practice with an unmounted tube before performing this
procedure in the tire. The vacuum device will make a distinct sound when all of the air has been removed
from the tube. It is important that you can identify this sound. If not, you will not know when the tire can be
safely drilled.
Caution: If the tube is not expanded before fl atproofi ng, pressure can build up rapidly inside the tire
resulting in an over-pressurized condition or possibly burst the tire casing, causing injury. Also, failure
to keep pressure in the tube during the venting process could cause the tube to sag allowing the
needle to puncture another hole or rupture the tube.
Method 2:
Mark the 12 o’clock position on the tire with tire chalk and dismount it. With the tube removed, drill
a hole at the 12 o’clock mark. Remount the tire and tube and proceed with processing.
Method 3:
Mark and drill the tire before mounting. This third option only works if you have prior knowledge
that the tire will be fl atproofed.
IMPORTANT: ALWAYS USE THE PROPER SAFETY DEVICES WHEN FILLING TIRES WITH TWO PIECE
RIMS OR LOCK RINGS.
Step 1:
Position the tire in the normal fi lling position.
Step 2:
Remove the valve core and fi ll the tire as you normally would.
Step 3:
When 30% of the fi nal desired pressure has been reached, insert the needle in the vent hole and
puncture the tube.
Step 4:
Continue fi lling the tire, maintaining 30% of the fi nal desired pressure in the tube. Regulate by
covering and uncovering the needle with your fi nger. This pressure will keep the tube seated
in the tire.
Step 5:
The tire is fi lled when material fl ows from the needle.
Step 6:
Remove the needle and insert a nail into the vent hole to seal the tire. Remember, the nail must also
be long enough to penetrate the tire and tube.
Step 7:
Pressurize the tire and then lay it fl at to cure.
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