Assembly - Hilti DX 351 Original Operating Instructions

when the controls do not operate properly. If necessary,
have the tool repaired at a Hilti service centre.
Servicing the tool
The tool should be serviced if:
1. Cartridges misfire
2. Fastener driving power is inconsistent
3. If you notice that:
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● contact pressure increases,
● trigger force increases,
● power regulation is difficult to adjust (stiff),
● the cartridge strip is difficult to remove.
CAUTION while cleaning the tool:
● Never use grease for maintenance/lubrication of tool
parts. This may strongly affect the functionality of the
tool. Use only Hilti spray or such of equivalent quality.
● Dirt from DX tool contains substances that could be
endangering your health.
– Do not breath in the dust from cleaning
– Keep dust away from food
– Wash your hands after cleaning the tool
Warning: The tool must be unloaded before carrying
out care and maintenance.
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8.1 Remove fastener guide or magazine
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8.2 Service
Unscrew the black housing counter clockwise fully.
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8.3 Push back the piston guide with the palm of the
hand to release the piston stoppers and then remove
the complete unit.
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8.4 Remove the black housing from the piston guide.
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8.5 Clean the fastener guide or magazine and the pis-
ton.
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8.6 Clean the cartridge transport.
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8.7 Clean the piston guide inside and outside (back-
side of the piston guide and the spring area.) and lubri-
cate it on the outside.
Clean in the cartridge chamber and the power regula-
tion hole at the end-face of the piston guide..
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8.8 Clean the inside of the housing. Slightly lubricate
the inside.
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Printed: 12.08.2013 | Doc-Nr: PUB / 5069821 / 000 / 02
CAUTION
■ The tool can get hot while oper-
ating.
■ You could burn your hands.
■ Do not disassemble the tool while
it is hot. Let the tool cool down.

9. Assembly

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9.1 Put the black housing onto the piston guide.
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9.2 Pull up the black housing against the spring and
hold it with your hand.
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9.3 Insert the complete unit so that the marks on the
piston guide and the marks on the metal housing are in
alignment.
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9.4 Push in the stoppers when the piston guide is in
far enough, so that the stoppers fit into the sleeve on
the side of the piston guide openings.
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9.5 Release the black housing and screw it on one or
two turns.
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9.6 Insert the piston all the way back (the piston can
be inserted anytime before the last whole turn) and fin-
ish screwing on the black housing until it engages.
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9.7 Press the single fastener guide or magazine into
the piston guide, then screw the threaded sleeve on until
it engages.