Siemens FLENDER H SH Series Assembly And Operating Instructions Manual page 87

Measures
Clean air filter
Clean fan and gear unit
Refill Taconite seals with grease
Periods
Every 3 months
Depending on requirements,
at least every 2 years
Every 3000 operating hours or
at least every 6 months
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Remarks
see item 10.2.3
See item 10.2.4
see item 10.2.5