Hilti DX 9-ENP Original Operating Instructions page 36

6.4 Cleaning the fastening tool
WARNING
Risk of injury! Cartridges in the tool could fire (explode).
▶ Check that all cartridges have been removed from the tool before carrying out the following tasks with
the tool.
CAUTION
Risk of burns! Parts of the tool may be very hot after the tool has been in use.
▶ If it is necessary to carry out maintenance without first allowing the tool to cool down, it is essential that
protective gloves are worn.
1. Disassemble the base plate. → page 27
2. Pull out the catch and hold it in this position. Pull the piston out of the piston guide and then release the
catch.
3. Pull the piston stopper out of the base plate. If necessary, use the piston to lever the piston stopper out
of the base plate.
4. Pull out the catch and hold it in this position. Pull the piston guide upwards out of the tool and then
release the catch.
5. Clean the inside of the tool. Then stand the tool upside down and tap it firmly with your hand so that the
dirt falls out.
6. Use the large accessory wire brush to clean the surfaces of the piston guide (see marked area).
7. Use the small round brush to clean the cartridge chamber and the adjoining holes for the power regulation
pin.
8. Use the narrow round brush to clean the cartridge guideway.
9. Use Hilti lubricant spray to lubricate the moving parts of the fastener strip guides.
Use of other lubricants may damage the rubber parts, especially the piston stopper. Moreover,
other lubricants may cause dust to adhere to parts of the tool resulting in a build-up of deposits.
10. Slide the piston guide into the tool from above, until the catch engages.
11. Pull out the catch and hold it in this position. Insert the piston, pushing it in until the tip of the piston no
longer projects beyond the end of the tool, and then release the catch.
12. Insert the piston stopper (rubber part to the front) into the base plate.
13. Fit the base plate. → page 27
14. Press the reset button for at least 1 second to reset the counter for the number of fasteners driven until
the next scheduled cleaning operation is due.
15. Check that the tool is ready for use. → page 24
6.5 Criteria for replacement of wear parts
Piston and piston stopper wear criteria
Status
New condition
Worn
Always replace the pis-
ton and piston stopper
together.
28 English
12
Illustration showing example Annotation
Signs of chipping at the tip / face
of the piston.
2241307
*2241307*