12
Small Gas Engines
C H A P T E R 1 9
Engine Reassembly and Break-In
357
Introduction 357
Reinstalling Internal Engine Components 357
Installing Valves (L-Head Engine) 358
Installing the Crankshaft, Camshaft, and
Governor Gear 358
Installing the Piston and Rod Assembly 359
Installing Overhead Valves 364
Installing the Cylinder Head 365
Installing the Crankcase Breather and Valve
Cover 366
Adjusting Crankshaft Endplay and Installing the
Crankcase Cover 367
Reinstalling External Engine Components 367
Engine Break-In 368
S E C T I O N 5
Applications
C H A P T E R 2 0
Lawn and Brush Equipment
373
Working Safely 373
Lawn Mowers 375
Rotary and Reel Mowers 375
Push-Type and Self-Propelled Mowers 376
Optional Features 376
Engine Starting 377
Minor Checks 379
General Maintenance 379
Chain Saws 382
Chain Saw Designs 382
Safety Features 382
S E C T I O N 5
Applications
Rules for Safe Operation 385
Chain Saw Maintenance 385
String Trimmers and Brushcutters 388
Design Features 388
Operator Safety 390
Starting and Safe Operation 391
String Trimmer and Brushcutter
Maintenance 394
Edger/Trimmers 396
Edger/Trimmer Features 397
Safety Features and Adjustments 397
Rules for Safe Operation 399
Edger/Trimmer Maintenance 400
Edger/Trimmer Storage 400
C H A P T E R 2 1
Lawn and Garden Tractors
403
Tractor Safety 403
Protect Children 404
Protective Clothing 404
Operating a Tractor Safely 404
Transporting a Tractor 405
Tractor Uses 405
Mowing and Mulching 405
Leaf Collecting 407
Plowing, Throwing, and Blowing Snow 407
Preparing Soil for Planting 409
Hauling a Trailer 409
Rotary Broom Sweeping 409
Engine Components 410
Chassis and Steering 410
Transmissions 412
Variable-Speed Transmission 414
Hydrostatic Transmissions 415
Electrical Safety Systems 421
Safety Interlocks 422
Electric Start Systems 423
Recoil Start System 425
Testing Procedure for Operator Presence
System (Safety Seat) 426
Circuits for Study 427
General Maintenance 427
Engine Lubrication 434
Optional Oil Accessories 434
Air Filter 434
Muffl ers 434
Engine Cleaning 435
Radiator Cleaning 435