Part of the John Deere Repair Manuals.
Before pulling the power plant out of your skid-steer loader, grab this 138-page John Deere 90 technical manual PDF (OEM #TM1205) to ensure you follow the correct factory procedures. Inside, you get a full teardown guide for the gasoline engine, complete hydraulic schematics detailing the main control valve, and clear wiring diagrams for the electrical system. Open up the troubleshooting section to diagnose hydrostatic drive faults or track down final drive issues fast. Set your spark plug gap to exactly 0.025 inches (0.64 mm) and verify the hydraulic system uses a 100 mesh screen before firing it up. Guesswork destroys expensive hydrostatic pumps. Download this bookmarked file directly to your phone or tablet, search for your exact spec, and repair your loader the right way.
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| General | 5-26 | Specifications (Engine, Hydraulic System, Drive System, Travel, Fluid Capacity, Tires) |
| Gasoline Engine Repair | 27-44 | Specifications and Tools, Engine Separation, Disassembly, Assembly, Cylinder Heads |
| Fuel Repair | 45-52 | Specifications, Carburetor Removal, Carburetor Repair, Governor Adjustment |
| Electrical Repair | 53-62 | Specifications, Starter Repair, Disassembly, Armature Checking, Solenoid Testing |
| Power Train Repair | 63-78 | Specifications, Hydrostatic Pump, Hydrostatic Motor, Final Drive Repair, Drive Chains |
| Steering and Brake Repair | 79-84 | Steering Repair, Steering Adjustment, Brakes Repair, Brake Adjustment |
| Hydraulic Repair | 85-92 | Hydraulic Pump Repair, Hydraulic Cylinders, Disassembly, Assembly |
| Gasoline Engine, Fuel and Air Operation and Tests | 93-108 | System Operation, Engine Analysis, Compression Test, Diagnosing Malfunctions |
| Electrical Operation and Tests | 109-118 | Wiring Diagram, System Testing, Flywheel Alternator, Diagnosing Malfunctions |
| Power Train Operation and Tests | 119-128 | Hydrostatic Drive, System Testing, Diagnosing Malfunctions, Drive Chains |
| Hydraulic Operation and Tests | 129-138 | System Operation, Main Control Valve, Relief Pressure, Diagnosing Malfunctions |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Hydraulic | 100 mesh screen | p. 7 |
| Spark Plug Gap | 0.025 in. (0.64 mm) | p. 7 |
| Hydrostatic System Filter replacement | Replace element | p. 17 |
| Air Cleaner element replacement | after six cleanings or annually | p. 15 |
| Fuel Filter replacement | Replace filter | p. 21 |
| Spark Plug torque | 28 ft-lbs (38 Nm) (3.9 kgm) | p. 18 |
| Drive Chain deflection | 1/2-inch (13 mm) | p. 21 |
| Idler sprocket torque | 180 ft-lbs (244 Nm) (24 kgm) | p. 20 |
| Hydraulic Pump Drive Belt tension | 3/8-inch (10 mm) deflection at 60 pounds (27 kg) | p. 21 |
| Hydrostatic Pump Drive Belt tension | 1/2-inch (15 mm) deflection at 20 pounds (9 kg) | p. 21 |
| Engine Horsepower | 23 hp | p. 7 |
| Hydraulic Pump Capacity | 7.5 gpm | p. 7 |
