This comprehensive service repair manual provides detailed instructions and diagrams for the John Deere 925, 935, 945, 955, 965, and 975 combines. It's designed for both DIY enthusiasts and experienced mechanics, offering step-by-step guidance to ensure repairs are completed correctly and efficiently.

The manual covers a wide range of topics, including:

* **General Information:** Specifications, pre-delivery, delivery, after-sales inspections, lubrication, periodic service, and engine and combine tune-up.
* **Engine:** General information, diagnosing malfunctions, cylinder head, camshaft, balancer shafts, cylinder block, liners, pistons, connecting rods, crankshaft, main bearings, flywheel, timing gear train, engine lubricating system, engine cooling system, air intake system, and speed control linkage.
* **Fuel System:** Diagnosing malfunctions, fuel tank, water trap, transfer pump, fuel filter, Roto Diesel fuel injection pump, Roosa Master fuel injection pump, Roosa Master fuel injection nozzles, and cold weather starting aids.
* **Electrical System:** Diagnosing malfunctions, components, wiring diagrams, starting motor, and alternator.
* **Power Train:** Engine clutch and clutch linkage (Combines 925, 935, 945), engine clutch (Combine 955), engine clutch (Combines 965 and 975), reverser clutch, control and linkage (Combines 965 and 975), front axle (Combines 925, 935, 945), front axle (Combines 955, 965, and 975), track system (Combines 965 and 975), separator drive, variable drives, and POSI TORQ ground drive (Combine 975).
* **Brakes and Rear Axle:** Parking brake (Combines 925, 935, 945), parking brake (Combines 955, 965, 975), footbrakes, rear axle, and V-support for wheel rear axle (Combine 975).
* **Hydraulic System:** General information, diagnosing malfunctions, pressure tests, hydraulic oil reservoir, filter, suction, and pressure lines, hydraulic pump and flow driver, tandem (dual-gear) hydraulic pump (Combines 965 and 975), single and three-spool control valves (Combines 925 to 955), seven-spool control valve (Combines 965 and 975), hydraulic cylinders, nitrogen accumulators, hydrostatic steering, hydraulic brakes, and hydraulic clutch control (Combines 965 and 975).
* **Cutting Platform and Corn Head:** General information, diagnosing malfunctions, cutting platform, knife drive, corn head, and corn head gear case.
* **Feeder House:** General information, diagnosing malfunctions, and feeder house.
* **Separator and Cleaning Unit:** General information, diagnosing malfunctions, threshing cylinder, concave, beater, cross shaker, straw walkers, cleaning shoe with sieves, and fan.
* **Elevators, Grain Tank, and Grain Tank Unloading Augers:** General information, diagnosing malfunctions, clean grain auger and elevator, lower tailings auger, elevator, and upper auger, grain tank leveling auger, unloading augers, and outer unloading auger and housing.

This manual provides comprehensive coverage of your John Deere combine, saving you time and money on repairs.

The John Deere 925, 935, 945, 955, 965, and 975 combines represent a line of powerful and versatile agricultural machinery designed for large-scale grain harvesting operations. These combines were introduced in the late 1970s and early 1980s, becoming staples in the fields of numerous farmers worldwide. The numbered model designations reflect the increasing size and capabilities of the combines, with the 925 being the smallest and the 975 being the largest and most powerful. These machines were renowned for their robust construction, advanced technology for their time, and ability to handle demanding harvesting conditions.

Equipped with a wide range of features, the John Deere 925-975 combines boasted advanced threshing and separating mechanisms, efficient grain handling systems, and powerful engines capable of delivering high levels of performance. They were designed to handle a variety of grain crops, including wheat, barley, oats, soybeans, and corn, with varying header sizes and configurations available to suit specific crop types and field conditions. The combines also offered features like variable-speed ground drives, hydraulically modulated threshing and cleaning systems, and optional cab features for operator comfort and control. The John Deere 925-975 combines, while no longer in production, continue to be recognized as reliable and efficient machines that played a significant role in maximizing grain yields and streamlining harvesting operations for many years.