Maintenance - Hilti DX 351-CT Manual

8.2

Maintenance

WARNING
Dangerous substances! The deposits inside DX tools contain substances that may present a health hazard.
▶ Do not inhale dust or dirt while cleaning.
▶ Keep dust and dirt away from foodstuffs.
▶ Wash your hands after cleaning the fastening tool.
▶ Clean the fastening tool and use Hilti spray as stated in the operating instructions. This will help prevent
malfunctions.
1. Regularly check all external parts of the fastening tool for damage.
2. Regularly check all operating controls to ensure that they work properly.
3. Use the fastening tool only with suitable cartridges and the recommended energy setting.
▶ Use of the wrong cartridges or incorrect driving-energy settings can lead to premature failure of the
fastening tool.
8.3 Servicing the tool
Service the tool in the following situations:
▶ If energy fluctuations occur (evidenced by irregularities in fastener penetration depth).
▶ If cartridge misfires occur (the cartridge is not fired).
▶ If the tool becomes noticeably less easy to operate:
▶ If the required contact pressure increases noticeably.
▶ If triggering resistance increases.
▶ If the adjuster for driving energy is stiff.
▶ If the cartridge strip is difficult to remove.
8.4 Cleaning fastening tool 10,
1. Disassemble the fastening tool. → page 7
2. Clean the fastener guide (bore and thread of the locking sleeve).
3. Clean the cartridge barrel with the cleaning rod supplied for the purpose.
4. Clean the outside and inside of the piston guide (rear of the piston guide), cartridge chamber (1) and hole
for power regulation (2) in the end face of the piston guide.
Do not use a metal brush to clean the O-ring and do not accidentally remove the O-ring. Metal
brushes can damage the O-ring.
5. Lightly oil the inside of the piston guide.
6. Check O-ring (3) for wear and damage and check that the O-ring is correctly seated.
7. Oil the outside of the piston guide or alternatively oil the inside of the locking sleeve.
8. Clean the inside and outside of the power-tool housing.
Prevent oil and Hilti spray from entering the switchgear box. Lubricant penetrating inside the
switchgear box can lead to malfunctions.
8.5 Additional checks in the course of the tool service
WARNING
Risk of injury! A faulty piston brake, piston or fastener guide leads to an increased risk of malfunctions.
▶ Check the piston brake and piston 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. Replace the piston if you establish that any one of the following points applies:
▶ The piston is broken.
▶ 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)
▶ The piston is bent (check by rolling the piston on a smooth, flat surface).
*388037*
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388037 English 11