Maintenance Instructions37MAINTENANCE SCHEDULE CHART - RECOMMENDED SERVICE INTERVALS - MODEL B18Service Item Daily 25Hours 50Hours 100Hours 400Hours Yearly Every2 Years Ref.PageCheck Engine Crankcase Oil Level x 39Check/Clean Engine Air Cooling System* x 46Clean Grass Buildup Under Deck x 49Service Mower Blades x 52Check Security of Air Filtration Components x 51Check Air Filter Restriction Gauge x 47Lubricate Grease Fittings and Oil Points* x 41Check Transaxle Fluid x 44Check Tire Pressure x 52Check Drive Belts(Engine/PTO, Ground Drive) x 53Check Deck Gearbox Oil Seals x 53Check Safety Switch System x 54Check Battery Electrolyte Level x 51Change Engine Crankcase Oil** x 40Change Engine Oil Filter x 40Check Security of Drive TireMounting Nuts (75 to 85 lb·ft) x 52Check Blade Brake Action x x 53Clean Transaxle Housing x 50Check Air Filter Element*** x 48Check/Regap Spark Plugs x 53Change Transaxle Oil and FilterΔ x 45Replace Air Filter Element*** x 48Replace Fuel Filter x 58Check/Adjust FSC Friction Lock x 54Check Fuel Lines and Clamps x 53Check PTO U-Joints for Wear/Looseness x 54Service Battery x 51Clean Engine Cooling Fins x 46Replace Fuel Lines and Clamps x 53Replace Dust Ejection Valve*** x 48Replace Ignition Wires x 54∗ More often in extremely dusty or dirty conditions∗∗ Change engine oil and filter after first 5 8 hours of operation of a new engine (break-in period)∗∗∗ Air cleaner is remote mounted Cummins/Fleetguard OptiAir™ unit, replace filter every 400 hoursΔ Change transaxle oil after the initial break-in period of 75-100 hours operationCAUTIONMaintenance procedures requiring special training ortools should be performed by a trained technician.