42
Maintenance
The internal mechanisms of the torque
wrench are subject to normal wear and
tear under operating conditions. For this
reason, the accuracy of the cut-out should
be checked at regular intervals.
Unless internal regulations at the place of
use say otherwise (e.g. test equipment
inspection to ISO 9000 et seq.) inspection
should take place after approx. 5000 uses
or every 12 months, whichever is the
shorter.
If inspection shows that there is a
deviation, the torque wrench must be
adjusted.
The inspection and adjustment must be
carried out in accordance with
DIN EN ISO 6789.
Checking the accuracy of
the cut-out value
A torque tester is necessary for the
inspection with sufficient capacity for the
wrench to be tested and with a
guaranteed accuracy of ± 1% of the
displayed reading.
If you have access to such a tester, you
may inspect the Manoskop
®
yourself.
Suitable torque testers are available from
STAHLWILLE. It is also possible for
STAHLWILLE to test the Manoskop
®
for
you.
To carry out the test, proceed as follows:
1. Set the torque wrench to the highest
scale reading
2. Operate the torque wrench five times
ensuring it cuts out properly each time
