Husqvarna 966061101 Operator's Manual page 74

Action
At least once each year
1. Clean the engine's cooling air intake.
2. Replace the air cleaner's pre-filter (foam).
3. Replace the air filter's paper cartridge.
4. Change the engine oil.
5. Replace the engine oil filter
6. Check/adjust the cutting height
7. Check/adjust the parking brake
8. Clean/Change the spark plugs
9. Inspect spark plug
10. Check the engine valve clearance
11. Check the engine valve clearance
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Date, mtr reading,
stamp, sign