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4-13 Refer to Fig. 4-12 SERVICE AT INTERVALS INDICATED WEEKLY OR 50 HOURS ANNUALLY OR 100 HOURS Verify safety start interlock system Prior to each use Visually inspect unit for loose hardware and/or damaged parts Prior to each use Visually inspect tires Prior to each use Check oil level, engine (1) Prior to each use or every 4 hours Clean air intake screen (4) Prior to each use or every 4 hours Clean foam element (4) Prior to each use or every 4 hours Check fuel level Prior to each use Blades -