Husqvarna Rider 20 ProFlex Operator's Manual page 50

Work done
25 hour service
1. Change engine oil (50 hours).
(25 hours if operating conditions severe).
2. Clean/replace air pre-filter or oil-foam element if fitted (25 hours).
(more regularly in dusty working conditions)
3. Clean/replace air filter cartridge (25 hours, 100 hours if pre-filter
fitted).
(more regularly in dusty working conditions)
4. Clean engine cooling air intake.
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SERVICEJOURNAL
Date, mileage, stamp, sign