This repair and service manual covers Scag Hydrostatic Commercial Walk-Behind Mowers, 1990 and later. Table of Contents Quick reference data; General information; Troubleshooting; Lubrication, maintenance and tune-up; Fuel and exhaust; Kohler MV18 and MV20 engines; Kohler CV14 and CV15 engines; Kohler CV20S engine; Kawasaki FC420V engine; Kawasaki FH451V, FH500V, and FH641V engines; Briggs & Stratton engine; Control linkages; Hydrostatic drive system; Mower deck; Clutch and drive belts; Brakes; Electrical system; Wiring diagrams. Clymer repair manuals can save you money on maintenance and repair bills. Step-by-step procedures and illustrations guide you through every job, from basic maintenance and troubleshooting, to complete teardown and rebuild. Contents Detail: CHAPTER ONE: GENERAL INFORMATION Manual Organization / Warnings, Cautions and Notes / Safety / Basic Service Methods / Model and Serial Numbers / Fasteners / Shop Supplies / Basic Tools / Precision Measuring Tools / Electrical System Fundamentals / Special Tools / Storage. CHAPTER TWO: TROUBLESHOOTING Engine Operating Fundamentals / Carburetor Fundamentals / Ignition System Fundamentals / Engine Starting Procedure / Engine Troubleshooting / Spark Test / Cylinder Leakdown Test / Electrical System Fundamentals / Electrical System Troubleshooting / Drive System Fundamentals / Drive-Train Troubleshooting / Lubrication / Cutter_Deck Troubleshooting / Drive Belts. CHAPTER THREE: LUBRICATION, MAINTENANCE AND TUNE-UP Pre-Operation Inspection and Check-List / Maintenance Schedule / Periodic Lubrication / Periodic Maintenance and Tune-up. CHAPTER FOUR: FUEL AND EXHAUST Fuel Tank / Fuel Shut-Off Valve / Fuel Hoses and Clamps / Fuel Filter / Throttle Control Cable Assembly / Choke Control Cable Assembly / Exhaust System. CHAPTER FIVE: KOHLER MV-18 and MV-20 ENGINES Note: The Kohler MV-18 and MV-20 are both four-stroke, opposed twin-cylinder, L-head (side valve), vertical crankshaft, air-cooled, pressure-lubricated engines. Engine Identification / Engine Removal / Engine Installation / Lubrication / Air Filter / Fuel Filter / Carburetor / Muffler / Blower Housing, Shrouds and Baffles / Fuel Pump / Ignition System / Flywheel / Alternator / Electric Starter Motor and Solenoid / Rewind Starter / Oil Sentry / Intake Manifold / Crankcase Breather / Oil Seals / Cylinder Heads / Valve and Valve Components / Governor / Internal Engine Components / Engine Disassembly / Piston, Piston Rings and Piston (Wrist) Pin / Cylinder Barrels / Connecting Rods / Crankshaft and Main Bearings / Camshaft / Governor / Oil Pump / Engine Reassembly. CHAPTER SIX: KOHLER CV14 and CV15 ENGINES Note: The Kohler CV14 and CV15 are air-cooled, four-stroke, twin-cylinder, pressure-lubricated engines equipped with a vertical crankshaft and overhead valve system. Engine Identification / Engine Removal / Engine Installation / Lubrication / Air Filter / Fuel Filter / Carburetor / Muffler / Blower Housing, Shrouds and Baffles / Ignition System / Flywheel / Alternator / Electric Starter Motor and Solenoid / Rewind Starter / Oil Sensor / Crankcase Breather / Oil Seals / Rocker Arm Cover / Rocker Arms and Pushrods / Cylinder Head / Valve and Valve Components / Hydraulic Valve Lifters / Internal Engine Components / Piston, Piston Rings and Piston (Wrist) Pin / Cylinder Block/Crankcase / Connecting Rod / Crankshaft and Main Bearings / Camshaft / Counterbalance Shaft / Governor (Internal Service) / Oil Pump / Engine Reassembly. CHAPTER SEVEN: KOHLER CV20S Note: The Kohler CV20S is an air-cooled, four-stroke, twin-cylinder engine equipped with a vertical crankshaft and overhead valve system. Engine Identification / Engine Removal / Engine Installation / Lubrication / Air Filter / Fuel Filter / Carburetor / Muffler / Blower Housing, Shrouds and Baffles /

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