Part of the John Deere Repair Manuals.
This is the complete John Deere factory repair manual (TM1401) for the 9400, 9500 and 9600 Maximizer combines. Across 1,235 pages it walks you through every major system on the machine: removing and rebuilding the diesel engine, servicing the hydrostatic power train and final drives, repairing the feeder house and separator, and tracing the full electrical system with wiring diagrams. It is the same information a John Deere dealer technician works from, with the torque values, capacities and test pressures called out so a repair is done to spec the first time.
What's Inside This John Deere 9400-9600 Repair Manual
| System | Pages | Key Topics |
|---|---|---|
| General | Safety, Identification Number Location, Specifications, Tune Up and Adjustment, Fuels and Lubricants | |
| Engine | Remove and Install Engine, Cooling System, Lower Engine Repair | |
| Fuel and Air Repair | Air Intake System, Diesel Fuel System | |
| Electrical System | Bulbs and Switches, Batteries, Harness and Connector Repair, Gauges and Monitors, Wiper and Radio, Alternator, Starting Motor, Electrical Engine Control | |
| Power Train Repair | Transmission and Differential, Ring and Pinion Final Drive, Planetary Final Drive, Hydrostatic System, Cam Lobe Motor, Tires and Wheels | |
| Power Steering and Brakes | Steering, Brakes | |
| Hydraulic Repair | Hydraulic Reservoir, Hydraulic Pumps, Hydraulic Valves | |
| Separator Shell | Gull Wing Doors | |
| Operator Station Repair | Air Conditioning System, System Components, Cab | |
| Feeder House Repair | Feeder House Conveyor, Conveyor Drum, Slip Clutch, Feeder House Drives and Reverser Gear Case, Contour Master Platform Driveshafts, Contour Master Tilt Cylinder and Frame | |
| Separator | Cylinder Drives, Straw Walkers and Crankshafts, Straw Chopper, Straw Spreader and Chaff Spreader, Shoe Supply Augers, Cleaning Fan, Chaffer and Sieve Frame, Tailings Elevator and Augers, Primary Countershaft Gearcase, Header Electromagnetic Clutch | |
| Grain Tank and Unloading System Repair | Grain Tank Cross Augers, Unloading Auger System Drives, Vertical and Horizontal Unloading Augers and Gearcases, Upper Clean Grain Elevator, Grain Tank and Extensions, Loading Auger Gear Case | |
| Engine Gearcase and Control Valve Repair | Engine Gearcase and Valve | |
| Dial-A-Matic Header Height Control | - |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| 9400 Combine | ||
| Engine (9400) | John Deere 6359 / 6068 | |
| 9500 and 9600 Combines | ||
| Engine (9500/9600) | John Deere 6076 | |
| All models | ||
| Engine Oil Capacity (Crankcase) | 14 L (14-1/2 qt) on 6359A; 18.9 L (20 qt) on 6068H; 25 L (26-1/2 qt) on 9500/9600 | |
| Coolant Capacity (With Heater) | 36 L (38 qt); 40 L (42 qt) on 9600 Corn Combine | |
| Engine-to-Bell Housing Cap Screw Torque | 340 N.m (250 lb-ft) | |
| Engine Mount Cap Screw Torque | 80 N.m (60 lb-ft) | |
| Radiator Test Pressure | 124 kPa (1.2 bar / 18 psi) | |
| Radiator Cap Test Pressure | 48 kPa (0.5 bar / 7 psi) | |
| 9400, 9500, 9600 Maximizer | ||
| Production Years | 1994-1996 | |
John Deere 9400-9600 Common Problems This Manual Covers
Header drive engages unexpectedly or will not disengage during unclogging
Trace the header drive hydraulic control valve and the drive-circuit solenoid for sticking or contamination. The Hydraulic Repair section covers removing and testing the hydraulic valves, and the Separator section covers the header electromagnetic clutch, so you can confirm whether the unwanted engagement is a stuck valve, a failed solenoid, or a clutch fault before replacing parts.
Manual Section: Hydraulic RepairEngine shuts down abruptly while working under load
This is usually fuel starvation from a failed water separator or air starvation from a clogged secondary air filter. Service the fuel water separator and replace the air filters at the intervals in the General section, then verify fuel supply and intake restriction before suspecting the injection pump.
Manual Section: GeneralHydraulic system overheats during extended operation
Contaminated or overdue hydraulic oil and filter are the common cause. Replace the hydraulic/oil filter on its service interval and inspect the hydraulic reservoir and pumps as described in the Hydraulic Repair section, checking for restricted return flow that drives oil temperature up.
Manual Section: Hydraulic RepairRough running with blue smoke on a 9600
Blue smoke with a rough idle points to a worn or failing injector. The Fuel and Air Repair section covers the diesel fuel system and injector service so you can isolate the bad cylinder, test the injector and restore clean combustion.
Manual Section: EngineFrequently Asked Questions
What engines are in the John Deere 9400, 9500 and 9600 combines?
The 9400 uses the John Deere 6359 or 6068 diesel, while the 9500 and 9600 run the larger 6076 diesel. The manual lists the crankcase oil and coolant capacities for each so you can service the right engine without guessing.
Why does the header drive engage unexpectedly or fail to disengage when unclogging?
That points to the header drive hydraulic control valve or a stuck solenoid in the drive circuit. The Hydraulic Repair and Feeder House sections cover testing the control valve and the electromagnetic header clutch so you can isolate whether the fault is hydraulic or electrical.
What are the engine bolt torque specs for these combines?
The General specifications give the key values, including 340 N.m (250 lb-ft) on the engine-to-bell-housing cap screws and 80 N.m (60 lb-ft) on the engine mount cap screws. Full tightening torques for each assembly are listed in the relevant repair section.
How often should the hydraulic and air filters be changed?
Owners report changing the hydraulic/oil filter around the 400-hour interval and the primary air filter annually. Skipping the hydraulic filter change is a common cause of the hydraulic system overheating during long days in the field.
Does this manual cover the electrical and wiring system?
Yes. The Electrical System section covers batteries, harness and connector repair, gauges and monitors, the alternator, starting motor and electrical engine control, with the wiring information needed to chase down intermittent faults such as burnt connectors above the air-to-air cooler.

















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