Husqvarna Rider 20 ProFlex Operator's Manual page 54

Work done
At least once a season
1. Change engine oil (50 hours).
(25 hours in severe operating conditions).
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. Check/adjust cutting height setting.
5. Check/adjust parking brake.
6. Inspect flame guard/spark arrestor, optional equipment
(50 hours).
7. Replace engine oil filter (100 hours).
8. Clean/replace spark plug (100 hours).
9. Replace fuel filter in fuel line (100 hours).
10. Clean pulse-air filter.
11. Clean cooling system (100 hours).
(more regularly in dusty working conditions)
12. Check engine valve clearance (100 hours).
13. Replace oil and filter in K66 gearbox (every 500 hours).
14. Carry out 300 hour service at authorised dealer.
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SERVICEJOURNAL
Date, mileage, stamp, sign