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5 Service Instructions
5.3 MS - Check points
5.3.13 Worm wheel and worm;
wear of teeth
Check the teeth of worm wheel and worm for
wear.
See
‘‘5.3.14 Tooth appearance examples” on
page 66
.
Examine the contact surfaces and compare the
tooth profiles. The gear may operate satisfactorily
even when worn to some degree.
When using mineral-type oil in the worm gear
housing, the presence of black deposits on the
spindle parts is an indication that the oil base has
deteriorated seriously or that some of the oil
additives have precipitated. If pits are found on
the worm gear, the cause could be that the
additives are not suitable for this purpose.
In all these cases it is imperative to change to a
high-temperature oil. See chapter
‘‘8.8
Lubricants” on page 135
.
NOTE
Replace both worm wheel and worm at the
same time, even if only one of them is worn.
NOTE
Presence of metal chips in the oil bath is an
indication that the gear is wearing
abnormally.
G
059
2911
1. Worm wheel
2. Worm (part of bowl spindle)
G
0
2
0541
1
Inspect the gear for deposits and pits
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