Husqvarna P-ZT26 CE Operator's Manual page 63

Action
At Least Once Each Year
Clean the engine's cooling air intake
Replace the air cleaner's pre-filter (foam)
Replace the air filter's paper cartridge
Change the engine oil
Replace the engine oil filter
Check/adjust the cutting height
Check/adjust the parking brake
Clean/Change the spark plugs
Inspect spark plug
Check the engine valve clearance
SERVICE JOURNAL
Date, mtr reading, stamp, sign
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63