Hilti DX 6 Series, Original Operating Instructions

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30 English 2232121
*2232121*
8.3.2 Checking piston and buffer 9
WARNING
Risk of injury! A faulty buffer or piston or a faulty base plate leads to an increased risk of malfunctions.
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Check the piston and buffer for wear and replace them if damaged.
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Do not tamper with or modify the piston.
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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:
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The piston is broken.
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The piston is badly worn or chipped (e.g. a segment of more than 90° of the circumferential
ring-shaped elevation at the piston tip broken away)
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The piston rings are cracked or missing.
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The piston is bent (check by rolling the piston on a smooth, flat surface).
2. The buffer must be replaced in the following cases:
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The metal ring of the buffer is loose or broken.
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The buffer no longer holds on the fastener guide.
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The rubber is badly worn at certain points under the metal ring.
8.3.3 Cleaning and oiling fastening tool 10
Use only Hilti spray. The use of other lubricants can cause malfunctions or damage the fastening tool.
1. Disassemble the fastening tool. → page 29
2. Use the flat brush supplied for the purpose to clean the piston rings until the piston rings move freely.
3. Use the flat brush to clean the lock of the fastener guide.
4. Oil the lock of the fastener guide and then wipe the lock lightly with a cloth.
5. Use the large round brush supplied for the purpose to clean the inside of the exhaust gas piston return
unit.
6. Oil the lock of the exhaust gas piston return unit on the inside.
7. Use the flat brush to clean the back end of the exhaust gas piston return unit and the pins.
8. Oil the pins and then wipe the pins lightly with a cloth.
9. Use the tapered brush supplied for the purpose to clean the tapered cartridge chamber.
10. Clean the cartridge barrel with the cleaning rod supplied for the purpose.
8.3.4 Final check of the fastening tool
1. After carrying out care and maintenance, check that all protective and safety devices are fitted and that
they function faultlessly.
2. Reset the cleaning indicator. → page 28
9 Problems with the fastening tool
WARNING! Risk of injury! Before you start troubleshooting, make sure there are no cartridges in the
fastening tool. If the cartridges cannot be removed, contact Hilti Service
If the trouble you are experiencing is not listed in this table or you are unable to remedy the problem by
yourself, please contact Hilti Service.
Malfunction Possible cause Action to be taken
The piston gets stuck in the
base material
The fastener is too short.
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Use a longer fastener.
The fastener has no washer.
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Use a fastener with washer for
applications on wood.
Too much driving energy.
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Turn the selector ring for driving
energy to reduce driving energy.
Higher force required to press
the tool against the surface
Build-up of combustion residues.
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Service the tool.
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Clean the cartridge chamber.
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Insert new cartridge strip.