08/05
Assembly
4.4.2 Version
R
The safety nut (1) is positioned below the travelling nut (2) without axial load and is therefore
not subject to wear. As the travelling nut wears, the distance (measure X) between the two
nuts decreases.
Fig. 9: Compressive load
Fig. 10: Tensile load
No. Name
1
Safety catch nut
2
Running nut
X
Dimension for axial clearance
The travelling nut must be replaced when the axial backlash with a single-start thread
is more than ¼ of the thread pitch (= measure X). Otherwise safety can no longer be
guaranteed.
If it wears more than ¼ of the thread pitch, it might cause potential dangers to people
and objects. Therefore, the measure X must be regularly checked.
A wear check without prior disassembly is possible.
In case of break of the thread of the travelling nut, the safety nut will take over the
load.
MULI
®
- JUMBO
®
37
