Husqvarna 966582201 Operator's Manual page 53

Action
50-Hour Service
Perform the 25-hour service.
Clean/replace the air cleaner's filter cartridge / paper filter
(shorter intervals for dusty operating conditions).
Change engine oil.
Lubricate according to lubrication chart.
Check/adjust the parking brake.
100-Hour Service
Perform the 25-hour service.
Perform the 50-hour service.
Change the engine oil filter.
Clean/replace the spark plugs.
Replace the fuel filter.
Clean the cooling fins on the engine and transmission.
Check V-belts.
Check/tighten caster wheel axle bolts (every 200 hours).
Change the air filter's paper cartridge.
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