Hilti DX 5 Mode D'emploi Original page 17

▶ If the required contact pressure increases noticeably.
▶ If the trigger resistance increases.
▶ If the power regulation wheel is stiff.
▶ If the cartridge strip is difficult to remove.
▶ If the maintenance indicator shows that a tool service is necessary.
6.4 Dismantling the single-fastener tool
1. Check that there is no cartridge strip or fastener in the tool. If there is a cartridge strip or fastener in
the tool, pull the cartridge strip up out of the tool by hand from above and remove the fastener from the
fastener guide.
2. Press the release button on the side of the fastener guide to unscrew the fastener guide.
3. Unscrew and remove the exhaust gas piston return unit.
4. Remove the buffer by bending it sharply out of the fastener guide. Remove the buffer.
5. Remove the piston.
6.5 Dismantling the magazine tool
1. Check that there is no cartridge strip or fastener in the tool. If there is a cartridge strip or fastener in
the tool, pull the cartridge strip up out of the tool by hand from above and remove the fastener from the
fastener guide.
2. Press the release button on the side of the fastener guide to unscrew the magazine.
3. Unscrew and remove the exhaust gas piston return unit.
4. Remove the buffer by bending it sharply out of the magazine. Remove the buffer.
5. Remove the piston.
6.6 Check of buffer and piston
WARNING
Risk of injury! A faulty buffer or piston or a faulty base plate leads to an increased risk of malfunctions.
▶ Check the piston and buffer for wear and replace them if damaged.
▶ Do not tamper with or modify the piston.
▶ Do not attempt to repair a faulty piston yourself, for example by grinding the tip.
1. The piston must be replaced in the following cases:
▶ The piston is broken.
▶ The piston is badly worn or chipped (e.g. a 90° segment broken away)
▶ The piston rings are cracked or missing.
▶ The piston is bent (check by rolling the piston on a smooth, flat surface).
2. The buffer must be replaced in the following cases:
▶ The metal ring of the buffer is loose or broken.
▶ The buffer no longer holds on the fastener guide.
▶ The rubber is badly worn at certain points under the metal ring.
6.7 Checking the fastener guide for wear
1. Check the fastener guide for wear and replace it if part of it is damaged (e.g. broken, bent, widened or
cracked).
2. Contact Hilti Service if necessary.
6.8 Cleaning and lubricating the single-fastener tool
1. Spray the piston rings lightly with oil and then use the flat brush to clean them using the flat brush until
the rings are free to move.
2. Use the flat brush to clean the thread on the fastener guide.
3. Use the large round brush to clean the inside of the housing.
4. Dismantle the exhaust gas piston return unit.
5. Clean the exhaust gas piston return unit.
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