AC MUM0040 rev. 11 - 25 -
MR12 - MR12C
15.4. COMPULSORY MAINTENANCE WORK
Check Frequency
oil level 4 months
thickness of brake linings *
adjustment of opening of brake shoes 2 months
wear and tear of pulley grooves 6 months
(acousc) of condion of bearings 6 months
(acousc) of presence of abnormal noise levels 6 months
Gear backlash 12 months
* The nominal thickness in 6 mm, brake shoes must be replaced before the minimum thickness of the
fricon material reaches 2 mm.
15.5. CHECKING THE GEAR BACKLASH
Due to the working principle of the worm gearbox the worm wheel is consumed by wear during the
lifeme of the gearbox. To ensure the safe funconality of the installaon it is necessary to check the
backlash regularly to make sure the backlash does not exceed the acceptable limits. There are two
ways to check the backlash between worm and worm wheel, on the input sha (worm sha) by use of
the ywheel or on the output sha (worm wheel) by use of the tracon sheave. The measurement on
the input sha is easier somemes but the check on the output sha is more reliable, for this reason
in case the backlash has been veried out of limit on the input sha we recommend to double check it
on the output sha.
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