Hilti DX 76-PTR Bedienungsanleitung Seite 33

or dirt from cleaning. Keep the dust or dirt away from
foodstuffs. Wash your hands after cleaning the tool.
Never use grease for the maintenance/lubrication of
parts of the tool. This may lead to malfunctions. Use
only Hilti lubricant spray or a product of equivalent
quality.
8.2.1 Checking and replacing the piston and
piston brake
WARNING
All cartridges must be removed from the tool. All
nails must be removed from the nail magazine or
the fastener guide.
CAUTION
After the tool has been in use, the parts to be handled
may be very hot. It is essential that gloves are worn
if the following maintenance operations have to be
carried out before the tool has been allowed to cool
down.
NOTE
Firing the tool repeatedly without driving a fastener
stresses the piston and piston brake and causes these
parts to wear. If the piston shows signs of chipping
and / or the synthetic rubber part of the piston brake
is badly worn, then these parts have reached the end
of their life.
NOTE
The condition of the piston and piston brake must be
checked at regular intervals and at least daily.
NOTE
To replace the piston and the piston brake it is
necessary only to unscrew the fastener magazine or
the fastener guide. It is not necessary to remove the
piston guide.
1. Unscrew and remove the fastener guide (or
fastener magazine).
2. Pull the piston out of the piston guide.
3. Check the piston for damage. If signs of damage
are found, the piston AND the piston brake must
be replaced. Check the piston brake for signs of
wear of the synthetic rubber part.
NOTE Check the piston for straightness by rolling
it on a smooth surface. Never use worn or dam-
aged pistons and do not attempt to manipulate
or modify the piston.
NOTE If the upper ring of the piston brake can be
turned easily toward the lower ring, the piston
brake is worn out and must be replaced.
4. If the piston has to be replaced, remove the
piston brake from the fastener guide.
5. Insert the new piston brake, the right way round,
in the fastener guide (or fastener magazine) that
is to be fitted to the tool.
NOTE Spray the opening in the piston brake with
Hilti lubricant spray.
NOTE The HVB fastener guide is equipped with a
piston stopper instead of a piston brake.
6. Insert the piston into the piston guide in the tool.
7. Screw the fastener guide (or fastener magazine)
onto the piston guide as far as it will go and then
turn it back until it engages.
8. Cycle the tool once with the cycling grip.
8.2.2 Cleaning the piston guide 9 19 20 21 22
WARNING
All cartridges must be removed from the tool. All
nails must be removed from the nail magazine or
the fastener guide.
CAUTION
After the tool has been in use, the parts to be handled
may be very hot. It is essential that gloves are worn
if the following maintenance operations have to be
carried out before the tool has been allowed to cool
down.
1. Check that the tool cycling grip is in its starting
position.
en
33