This comprehensive service manual provides detailed information for diagnosing and repairing John Deere Combines models 1450, 1450 CWS, 1550, and 1550 CWS with serial numbers before 047353. The manual covers a wide range of components and systems, including the electrical system, powertrain, brakes, steering, rear axle, hydraulic system, and cab. It is an invaluable resource for technicians and mechanics who need to troubleshoot and repair these combines. The manual begins with a safety section, followed by an overview of the electrical system. It includes comprehensive electrical system diagrams, detailed information on power supply and starting motor, start aid (for 1450 CWS and 1550 CWS models only), engine stop systems, fuse testing, instrument functions, chopper vane adjustments, lighting and windshield washer systems, radio and clock operations, alarm module and STOP function, warn module, cigarette lighter, light and flasher functions, revolving lights, air conditioning system, electrical mirror adjustments, work lights, straw warning device, stop lights and reel speed adjustments, separator engage and unloading drive circuit, header engage and reel circuit, reverser, INFO-TRAK monitor and speed monitoring, harvest performance monitor, cylinder, concave and fan adjustments, header controller board, swing in/out unloading tube, acre counter (for 1450 CWS and 1550 CWS models only), shift lock (for 1450 CWS and 1550 CWS models only), back up alarm and sieves light, and header calibration procedures, as well as information on wiring harnesses. The manual continues with a section on the powertrain, covering specifications, checking parts for wear, and testing the hydrostatic system. It also includes detailed information on the transmission. A separate section covers the braking, steering, and rear axle systems, providing specific instructions on the brake system, drum brakes, and steering system. The hydraulic system is covered in depth, with explanations of hydraulic symbols, hydraulic lines, pump drive, control valve, reel motor, and troubleshooting procedures. The manual concludes with a section on the cab, covering the cab and operator's seat, air conditioning and heating systems, ventilation and heating troubleshooting, operational tests, and troubleshooting the air conditioning system. This manual provides all the necessary information and diagrams for diagnosing and repairing these John Deere combine models.

The John Deere 1450, 1450 CWS, 1550, and 1550 CWS combines were a series of agricultural machines manufactured by John Deere in the 1980s and early 1990s. These combines were known for their powerful engines, efficient harvesting capabilities, and robust construction. The 1450 and 1550 models were differentiated mainly by their engine size and horsepower output, with the 1550 being the larger and more powerful of the two. The "CWS" designation indicated a "Combine with Separators," a feature that allowed for greater flexibility and efficiency in harvesting various crops. These combines were equipped with a range of advanced features for their time, including a high-capacity unloading auger, a dual-rotor threshing system, and a sophisticated electronic control system. The 1450 and 1550 combines were highly popular among farmers due to their reliability, performance, and versatility. They were used for harvesting a wide variety of crops, including wheat, barley, oats, soybeans, and corn. Despite their age, these combines remain a valuable resource for many agricultural operations, and their robust construction and well-designed components make them suitable for years of continued service. The service repair manual (TM4699), specifically designed for these models, plays a vital role in ensuring their proper maintenance, troubleshooting, and repair, maximizing their lifespan and productivity.