Maintenance Instructions45MAINTENANCE SCHEDULE CHART - RECOMMENDED SERVICE INTERVALS - MODEL H27iService Item Daily 25Hours 100Hours 200Hours 400Hours Yearly Every2 Years Ref.PageCheck Engine Crankcase Oil Level x 47Check/Clean Engine Air Cooling System* x 55Check Air Filter Restriction Gauge x 53Clean Grass Buildup Under Deck x 57Service Mower Blades x 60Check Security of Air Cleaner System x 59Check Function of Warning Lights and Horn x 26Lubricate Grease Fittings and Oil Points* x 49Check Tire Pressure x 60Check Drive Belts (Engine/PTO, Ground Drive,Blade Drive) x 61Check Operation of Safety Interlock Switches x 62Check Battery Electrolyte Level x 59Check Transaxle Oil Level (in Reservoir) x 49Change Engine Crankcase Oil**Δ x 47Check Air Filter Element*** x 54Clean Engine Cooling Fins x 56Check Security of Drive TireMounting Nuts (75 to 85 lb·ft) x 60Check Blade Brake Action x 62Check FSC Friction Lock x 63Check Operation of Turbine Precleaner Fan* x 53Check/Adjust Blade Clutch x 74Clean Transaxle Housing x 58Change Engine Oil Filter x 47Check/Regap Spark Plugs x 61Replace Fuel Filter x 68Change Transaxle Oil and FilterΔΔ x 52Check Fuel Lines and Clamps x 61Replace Air Filter Element, Safety Filter,Dust Ejection Valve*** x 54Service Battery x 59Service Solenoid Shift Starter x ΔΔΔCheck PTO UJoints for Wear/Looseness x 62Check Transmission Control Settings x 62Replace Fuel Lines and Clamps x 61Replace Ignition Wires x 61* More often in extremely dusty or dirty conditions (refer to notes about air cleaner element inIMPORTANT TIPS FOR CARE OF THE KOHLER ENGINE)** Change engine oil and filter after first 5 hours of operation of a new engine (break-in period)*** Air cleaner is remote mounted Cummins/Fleetguard OptiAir™ unit, replace filter(s) every year and dust ejectionvalve every year or when worn or damagedΔ Change oil every 50 hours when operating in dry, dirty conditionsΔΔ Change transaxle oil after the initial break-in period of 75-100 hours operationΔΔΔ See your Walker dealer for this service or refer to the Walker Service ManualCAUTIONMaintenance procedures requiring special training ortools should be performed by a trained technician.