Hilti DX E?72 Operating Instructions Manual page 14

9.1 Care of the tool
WARNING
Do not use a spray or steam/water jet system for
cleaning. Never operate the tool when the ventilation
slots are blocked. Do not permit foreign objects to
enter the interior of the tool.
Clean the outside of the tool at regular intervals with a
slightly damp cloth.
9.2 Maintenance
Check all external parts of the tool for damage at regular
intervals and check that all controls operate faultlessly.
Do not operate the tool if parts are damaged or when the
controls do not function faultlessly. If necessary, the tool
should be repaired by Hilti Service.
Use the tool only with the recommended cartridges. Use
of the wrong cartridges or use of excessively high power
settings may lead to premature failure of parts of the tool.
WARNING
Dirt and residues in DX tools contain substances that
may be hazardous to your health. Do not inhale dust /
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.
9.3 Servicing the tool
Service the tool if fastener driving power is found to be
inconsistent, if cartridges misfire or if parts of the tool
no longer move or operate smoothly and easily. In other
words, the contact pressure required to make the tool
ready to fire increases, trigger resistance increases, used
cartridges are difficult to remove or the cycling action
becomes stiff.
9.3.1 Disassembling the tool 8 9 10 11
NOTE
If the tool is badly fouled, push the piston out of the piston
guide by pushing it from behind, through the cartridge
chamber. Use the ramrod for this purpose.
1. Press the catch fully and, at the same time, pull the
assembly vertically right out of the tool.
2. Tap the assembly lightly on the floor to bring the
piston forward.
3. Hold the fastener guide securely with one hand
and turn the piston guide counterclockwise with the
other hand.
4. Remove the stop ring and pull the piston out.
9.3.2 Checking the piston and stop ring for damage
or wear
NOTE
Never use a worn or damaged piston and do not tamper
with or attempt to modify the piston.
NOTE
Replace the stop ring if it is deformed or damaged.
CAUTION
Continued use of the tool with a deformed stop ring
may result in damage to the fastener guide and piston.
Replace the piston if:
- the piston is broken
- the piston is badly worn or chipped (e.g. a 90° segment
broken away).
- the piston ring is cracked or missing.
- the piston is bent (check by rolling the piston on a
smooth, flat surface).
9.3.3 Checking the fastener guide for wear
Replace the fastener guide if the tubular section is dam-
aged (e.g. bent, widened or cracked).
9.3.4 Checking the O-ring for damage or wear
Replace the O-ring if it is cracked, badly squashed or
missing.
9.3.5 Cleaning 12 13 14 15
CAUTION
Take care to avoid damaging the O-ring with the
brush.
Clean the tool at least once a week or, respectively,
immediately after each period of heavy use (after driving
approx. 3,000 nails).
Use the appropriate brushes to clean the individual parts:
- clean the inside of the housing
- clean the piston guide and the cartridge chamber
- clean the inside and the outside of the fastener guide
Clean the piston and the piston ring until it moves freely.
9.3.6 Lubrication
Spray the cleaned parts lightly with the Hilti lubricant
spray supplied. Use only Hilti lubricant spray or a product
of comparable quality.
9.3.7 Assembling the tool 16 17 18
NOTE
Handle the small parts carefully. They could get lost.
1. Fit the stop ring to the piston and then push the
piston into the piston guide.
2. Screw the fastener guide into the piston guide until
flush.
3. Push the assembly, with the slot underneath, into
the tool as far as it will go.
9.3.8 Checking
After carrying out care and maintenance, check that all
protective and safety devices are fitted and that they
function faultlessly.
en
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