HBM U1A Notice De Montage page 28

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Mounting the lower knuckle eye 1−U1/5kg/ZGU:
• Screw lower knuckle eye into the central hole (M5) in the base of the
housing; starting torque approx. 4 N⋅m.
Force introduction
Code A
Fig. 4.6: Force introduction with the lower knuckle eye
NOTE:
The force introduction parts (centre−pin, external thread, internal thread)
are protected against torsion by an adhesive and can be carefully
unscrewed or screwed down by hand, or by using an SW19 hexagonal
spanner (in the case of Code B and Code C). Before a force introduction
part is screwed down, make sure that any residual adhesive is removed.
Make sure that you do not damage the aluminium thread!
ATTENTION
This method of force introduction part replacement applies with effect
from K−U1A part numbers. In the case of older versions, force
introduction parts have to be replaced at HBM.
HBM
Force introduction
Code B
M5
Replacing force introduction parts A, B and C
Force introduction
Code C
a0279-4.0 de/en/fr
U1A