Hilti DX462 Operating Instructions Manual page 8

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8.4 Check the buffer and piston for wear
Replace the buffer if:
G the metal ring is loose or broken,
G the buffer no longer holds on the fastener guide,
G excessive, uneven wear beneath the metal ring is
noticed.
Replace the piston if:
en
G it is broken,
G the tip is heavily worn (i.e. a 90° segment is chipped
off),
G piston rings are broken or missing,
G it is bent (check by rolling on an even surface).
NOTE
Do not use worn pistons. Do not modify or grind pis-
tons.
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8.5 Cleaning the piston rings
1. Use the flat brush to clean the piston rings.
2. Spray the piston rings lightly with Hilti spray.
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8.6 Clean the threaded section of the fastener guide
1. Clean the thread with the flat brush.
2. Spray the thread lightly with Hilti spray.
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8.7 Disassemble the piston return unit
1. Press the release button at the gripping part.
2. Unscrew the piston return unit.
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8.8 Clean the piston return unit
1. Clean the spring with the flat brush.
2. Clean the front end with the flat brush.
3. Use the small round brush to clean the two holes at
the end face.
4. Use the large round brush to clean the large hole.
5. Spray the piston return unit lightly with Hilti spray.
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8.9 Clean inside the housing
1. Use the large round brush to clean inside the hous-
ing.
2. Spray the inside of the housing lightly with Hilti
spray.
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8.10 Clean the cartridge strip guideway
Use the scraper provided to clean the right and left car-
tridge strip guideways. The rubber cover must be lifted
slightly to facilitate cleaning of the guideway.
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8.11 Spray the power regulation wheel lightly with
Hilti spray.
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8.12 Fit the piston return unit
1. Bring the arrows on the housing and on the exhaust
gas piston return unit into alignment.
2. Push the piston return unit into the housing as far as
it will go.
3. Screw the piston return unit onto the tool until it
engages.
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8.13 Assemble the tool
1. Push the piston into the tool as far as it will go.
2. Press the buffer onto the fastener guide until it snaps
into place.
3. Press the fastener guide firmly onto the piston return
unit.
4. Screw the fastener guide onto the tool until it engages.
8.14 Checking the tool following care and mainte-
nance
After carrying out care and maintenance on the tool,
check that all protective and safety devices are fitted and
that they function correctly.
NOTE
G The use of lubricants other than Hilti spray could dam-
age rubber parts, especially the buffer.