DAF LF45 Series, Manual

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LF 45/55 series General
THREADED CONNECTIONS
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1. GENERAL
1.1 DIPPED THREADED CONNECTIONS
DAF vehicles are fitted with threaded
connections which have been treated with a
lubricant (dipped threaded connection).
Factory-galvanised bolts and nuts are
wax-dipped. Black annealed and phosphatised
bolts and nuts are oil-dipped. The advantage of
using a lubricant is that friction during tightening
of the threaded connection is reduced, so that
the specified pre-tension can be obtained more
easily and more accurately. The tightening
torque can be reduced while the pre-tension
force remains the same.
To achieve a small spread in the pre-tension
force, the dipped threaded connection must be
tightened accurately. Therefore, always use a
reliable and accurate torque wrench.
Note:
Have torque wrenches regularly inspected and
calibrated.
To achieve the correct pre-tension when
re-using threaded connections, it is important to
clean the threaded parts thoroughly. After
cleaning, apply one drop of lubricant to the first
turn of the screw thread and one drop to the
abutting surface of the nut or bolt. If bolts and
nuts to be re-used, do not lubricate them with
anything other than engine oil. Lubricants other
than engine oil or factory-applied lubricant must
not be used under any circumstances because
of the difference in frictional coefficient.
When locking compounds are used for dipped
threaded connections, the instructions given
here apply, except for applying lubricant to the
first turn of the screw thread.
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