Haklift Oy
Asessorinkatu 3-7
20780 Kaarina, Finland
Tel. +358 2 511 5511
www.haklift.com
Lifting Solutions Group
Axel Johnson International
STANDARDS FOR CHECKING CLAMPS
SECTION
INSPECTION METHOD
PERMISSIBLE LIMIT
CAUSES OF THE TROUBLE
BODY
Visually check or use color
dyes to locate cracks.
Measure the displacement
of the center of the screw
to determine the amount of
elongation.
Replace when cracks
are found.
Replace when the
displacement of the
center of the screw
exceeds 2 mm.
-Overloading
-Changes in the material
structure caused by exposure
to heat
-Fatique from repeated use
-Too large hoisting angle
SCREW
Visually check or use color
dyes to locate cracks.
Visually check for bends in
the screw.
Visually check for wear or
damage on the screw.
Replace when cracks
are found.
Replace when the
movement is not
smooth, or when the
displacement of the
screw center is large.
Replace when the
displacement or the play
becomes large.
-Overloading
-Dynamic loads
-Natural wear from use
-Insufficient lubrication
CAM
Visually check and
measure the amount of
wear.
Visually check for broken
cam teeth.
Width of wear
Permissible limit of width
of wear: under 0,5 mm
Below 1/6 of D
-Natural wear from use
-Wear from clamping hardened
material
-Wear from clamping hardened
material
-Overloading