Maintenance Instructions43MAINTENANCE SCHEDULE CHART - RECOMMENDED SERVICE INTERVALS - MODEL MCService Item Daily 25Hours 100Hours 200Hours Yearly Every2 Years Ref.PageCheck Engine Crankcase Oil Level x 45Check/Clean Engine Air Cooling System* x 54Check Security of Air Filtration Components x 57Check Air Filter Restriction Gauge x 53Clean Grass Buildup Under Deck x 55Clean GHS Exhaust Screen* x 40Clean GHS Blower* x 56Service Mower Blades x 58Check Function of Oil Pressure Warning Horn x 23Lubricate Grease Fittings and Oil Points* x 49Check PTO Gearbox Oil Level** x 48Check Battery Electrolyte Level x 57Check Hydrostatic Transmission Fluid ◊ x 48Check Tire Pressure x 58Check Drive Belts (Jackshaft, Engine PTO,GHS Blower, Ground Drive) x 59Check Gearbox Oil Seals x 60Check Safety Switch System x 60Check Turbine Precleaner* x 52Check Air Filter Element *** x 53Change Engine Crankcase Oil Δ x 45Check Oil Level in Gear Axle x 48Clean Hydrostatic Transmission Cooling Fins x 57Clean Engine Cooling Fins x 55Check Brake Action x 60Check Wheel Bolt Torque (75 to 85 ft-lbs) x 58Check/Regap Spark Plugs x 60Change Engine Oil Filter x 45Check Fuel Lines and Clamps x 60Replace Air Filter Element, Safety Filter,and Vacuator™ Valve *** x 53Replace Fuel Filter x 67Service Battery x 57Check FSC Friction Lock x 61Service Solenoid Shift Starter x 60Check Engine Valve Clearance x ΔΔΔChange Gear Axle Oil ΔΔ x 48Replace Fuel Lines and Clamps x 60Change Hydrostatic Transmission Fluid ΔΔ x ΔΔΔ∗ More often in extremely dusty or dirty conditions∗∗ Change PTO gearbox oil after first 100 hoursof operation (break-in period)∗∗∗ Air cleaner is remote mounted Donaldson Radialseal™unit, replace filter every yearΔ Change engine oil and filter after first 5 hours ofoperation of a new engine (break-in period)ΔΔ Change every 2 years or 1000 hoursΔΔΔ See your Walker dealer for this service orrefer to the Walker Service Manual◊ Hydrostatic transmissions are sealed - DO NOT OPENRESERVOIR CAPS - refer to Hydrostatic Transmission FluidCAUTIONMaintenance procedures requiring special training ortools should be performed by a trained technician.CAUTIONWhen performing maintenance with themower body raised, a safety prop shouldbe installed from back of body to chassisframe (fail-safe protection in case of failureof body lift support). For GHS Model,empty grass catcher before raising body.