Hilti DX 351-BT Manual page 28

5.1 Assembling the fastening tool
1. Push the locking sleeve on to the piston guide from the rear.
2. Bring the mark on the piston guide (1) into alignment with the mark on the metal housing (2).
3. Press and hold down the locking sleeve against the spring and insert the piston guide fully into the
power-tool housing.
4. Squeeze the two latching pawls (3) together and tighten the locking sleeve by screwing it clockwise as
far as it will go.
5. Open the piston stop by turning the locking sleeve one full turn counter-clockwise.
6. Insert the piston as far as it will go into the piston guide.
7. Fully tighten the locking sleeve by screwing it as far as it will go clockwise.
▶ The locking sleeve engages with an audible click.
8. Install a fastener guide. → page 22
5.2 Disassembling the fastening tool
1. Remove the fastener guide. → page 22
2. Open the piston stop by turning the locking sleeve one full turn counter-clockwise.
3. Pull the piston out of the piston guide.
4. Completely unscrew the locking sleeve from the thread of the power-tool housing.
The locking sleeve sits on a preloaded spring on the piston guide. Hold the piston guide firmly
while unscrewing.
5. Pull the piston guide with locking sleeve out of the power-tool housing.
6. Pull the locking sleeve to the rear and off the piston guide.
5.3 Changing fastener guide 5,
Removing fastener guide
1. Release the fastener guide by unscrewing the union nut counter-clockwise.
2. Pull the fastener guide out of the piston guide.
Installing fastener guide
3. Check that piston brake (1) is present and undamaged.
4. Position the fastener guide on the piston guide.
5. Push the fastener guide over the protective sleeve into the piston guide as far as it will go.
▶ The piston guide retracts fully into the power-tool housing.
▶ The fastener guide is seated correctly on the piston guide.
6. Secure the fastener guide by screwing union nut (2) clockwise until it is tight.
▶ The annular spring engages with an audible click in the arbor hole of the fastener guide.
7. Check that the annular spring is correctly seated in the arbor hole (3).
5.4 Loading the single-fastener tool
1. Check that the paint guard is present and undamaged.
▶ Damage to the paint guard can lead to damage to corrosion-protection coatings when fasteners are
driven. Replace the fastener guide if you establish that the paint guard is damaged.
2. Push the fastener into the fastener guide from the front until the fastener is held in place in the fastener
guide.
5.5 Loading cartridge strips
1. Push the cartridge strip, narrow end first, into the cartridge barrel (insert) until the full length of the
cartridge strip is inside the grip.
2. If you wish to use a cartridge strip in which some of the cartridges have already been used, pull the strip
up and out the top of the fastening tool by hand until the first unused cartridge is in place in the cartridge
chamber.
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