Service (Changing The Piston And Piston Brake); Care And Maintenance - Hilti DX 351 Original Operating Instructions

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6.1 Loading the single-fastener tool
Insert the fastener flat end (head) first until the washer
is held in the tool.
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6.2 Inserting the cartridge strip
Load the cartridge strip narrow end first by inserting it
into the bottom of the toolgrip until flush. If the strip has
been partly used, pull it through until a live cartridge is
in the chamber.
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6.3 Power regulation
Adjust the driving power by turning the regulating wheel.
1= minimum power
2= medium power
3= maximum power
Select the cartridge power level and power regulation
setting to suit the application. If you have no previous
experience of this application, always begin with the
lowest power level.
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6.4 Using the single-fastener tool
When fastening, position the tool perpendicular to the
work surface, press down and then pull the trigger.
WARNING
– Re-use of fasteners:
If the first attempt to drive a fastener fails, so not use
or redrive the same fastener a second time.
– Do not drive fasteners into holes:
Driving fasteners into existing holes is not permissi-
ble unless specifically authorized by Hilti.
– Fastener driving rate:
Do not exceed the maximum fastener driving rate.
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6.5
Pull the cartridge strip out of the tool.
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6.6 Fitting the magazine
1. Unscrew the single fastening fastener guide, thread-
ed sleeve and pull the fastener guide out.
2.Press the nail magazine onto the piston guide, then
screw the threaded sleeve on clockwise until it engages.
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6.7 Loading the magazine tool
1. Unscrew the single fastening fastener guide, thread-
ed sleeve and pull the fastener guide out.
2. Press the nail magazine onto the piston guide, then
screw the threaded sleeve on clockwise until it engages.
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6.8 Using the magazine tool
When fastening , position the tool perpendicular to the
work surface, press down and then pull the trigger.
Note:
If the nail magazine is empty, the tool cannot be fired.
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6.9 Conversion to single-fastening tool
(changing the equipment)
1. Pull the cartridge strip out of the tool.
2. Open the magazine by pulling the nail pusher down
until it locks, then take out the nail strip. Unscrew the
magazine threaded sleeve.
Printed: 12.08.2013 | Doc-Nr: PUB / 5069821 / 000 / 02
3. Press the single fastener guide onto the piston guide,
then screw the threaded sleeve on until it engages.
7. Service (changing the piston and
piston brake)
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7.1 Check that the tool is not hot.
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7.2 Remove the cartridge strip from the tool. Unscrew
the fastener guide or magazine.
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7.3 Turn the black housing one whole revolution (360°
counter clockwise). This will release the piston stoppers
so you can remove the piston from the tool.
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7.4 Typical wear of piston.
Check if piston is chipped or damaged. Replace if sig-
nificant chipping or damage has occurred.
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7.5 If the piston sticks in the piston guide, the entire
piston guide unit must be removed (see section «Care
and maintenance»). Push out the piston through the
cartridge chamber.
Note:
Do not grind the piston. If the piston is made shorter
the tool will be damaged.

8. Care and maintenance

When this type of tool is used under normal operating
conditions, dirt and residues build up inside the tool
and functionally relevant parts are also subject to wear.
Regular inspections and maintenance are thus essen-
tial in order to achieve reliable operation. We recom-
mend that the tool is cleaned and the piston and piston
brake are checked at least weekly when the tool is sub-
jected to intensive use, and at the latest after driving
8,000 fasteners.
Care of the tool
The outer casing of the tool is manufactured from impact-
resistant plastic. The grip comprises a synthetic rubber
section. The ventilation slots must be unobstructed and
kept clean at all times. Do not permit foreign objects to
enter the interior of the tool. Use a slightly damp cloth
to clean the outside of the tool at regular intervals. Do
not use a spray or steam-cleaning system for cleaning.
Maintenance
Check all external parts of the tool for damage at regu-
lar intervals and check that all controls operate proper-
ly. Do not operate the tool when parts are damaged or
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