Troubleshooting; Replacing A Deformed Stop Ring - Hilti DX 450 Operating Instructions Manual

Fastening tool
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Malfunctioning and remedies
Malfunction
Misfire:
Repeated misfires:
Very significant drop in driving power:
Widely varying depth of penetration:
Stiff cycling action:
18
Printed: 24.03.2014 | Doc-Nr: PUB / 5125252 / 000 / 02
Remedies
See "Cartridge misfire".
(See paragraph 14 on page 13).
Service the tool
Service the tool
Cycle the tool fully, i.e. pull out the assembly all
the way. It may be necessary to lubricate the
baseplate and piston guide slightly using Hilti
spray.
Use Hilti spray to lubricate the piston guide and
baseplate.

Replacing a deformed stop ring

A deformed stop ring may jam on the piston.
The fastener guide and piston bind together
and have to be separated.
Procedure
Strike protruding piston sharply against a
hard surface. This will separate piston and
stop ring. Remove piston completely from
fastener guide. Pull stop ring off fastener
guide to one side and press in a new one.

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