Part of the John Deere Repair Manuals.
All 314 pages of this John Deere STX30, STX38, STX46 Technical Manual PDF (OEM ID TM1561) point at one job: putting your lawn tractor back to factory condition, gear or hydrostatic drive alike. Inside: full wiring harness diagrams and schematics with circuit-by-circuit diagnosis, a dedicated troubleshooting section for engine, electrical, and power train faults, and fastener torque tables in metric and inch sizes. You also get step-by-step repair procedures for the engine, brakes, steering gear, mower decks, and both transaxle types. Gap the spark plug at 1.0 mm (0.040 in.), set fast idle to 3350 ±50 rpm, and check the gear-drive traction belt against its 2660 ±8 mm effective length before you blame the transaxle. No more chasing electrical gremlins with a test light and a hunch. Bookmarked and keyword-searchable; pull it up on your phone right at the tractor.
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| Introduction | 3 | Table of Contents, Specifications, Theory of Operation, Troubleshooting Diagram, Diagnostics, Tests & Adjustments, Repair |
| Safety | 4-8 | |
| Specifications & Information | 9-32 | General Vehicle Specifications, Metric Fastener Torque Values, Inch Fastener Torque Values, O-Ring Seal Service Recommendations, Gasoline Specifications, 4-Cycle Gasoline Engine Oil, Hydrostatic Transmission Oil, Serial Number Locations |
| Engine | 33-84 | Engine Specifications, Troubleshooting, Engine Diagnosis, Throttle Cable Adjustment, Fuel and Air System Repair, Engine Repair, Valve Guides, Cylinder Block |
| Electrical | 85-164 | Electrical Specifications, Theory and Diagnostic Information, Component Location, Troubleshooting, Wiring Harness Diagrams, Wiring Schematics, Circuit Operation and Diagnosis |
| Gear Power Train | 165-232 | Power Train Specifications, Component Location, Theory of Operation, Troubleshooting, Diagnosis, Tests and Adjustments, Repair, Brakes |
| Hydrostatic Power Train | 233-280 | Hydrostatic Power Train Specifications, Component Location, Theory of Operation, Troubleshooting, Diagnosis, Tests and Adjustments, Repair, Traction Drive Belt |
| Steering | 281-286 | Steering Specifications, Steering Backlash, Steering Gear Assembly, Pedestal Bushings |
| Miscellaneous | 287-308 | Wheels, Front Axle, Mower Decks, Lift Linkage, Spindles, Seat Removal |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| Traction Drive Belt (Gear) - Actual effective length | 2660±8 mm (104.7±0.3 in.) | p. 12 |
| Traction Drive Belt (Hydro) - Actual effective length | 2485±8 mm (97.8±0.3 in.) | p. 12 |
| Spark Plug Air Gap | 1.0 mm (0.040 in.) | p. 11 |
| Slow Idle Speed—Domestic and Export | 1650 ±75 rpm | p. 34 |
| Fast Idle Speed—Domestic | 3350 ±50 rpm | p. 34 |
| Slow idle speed | 1650 ± 75 rpm | p. 44 |
| Domestic Fast idle speed | 3350 ± 50 rpm | p. 44 |
| Spark plug gap | 1.0 mm (0.04 in.) | p. 48 |
| Air Filter Assembly Nuts | 10 N•m (88 lb-in.) | p. 61 |
| Starter solenoid ground terminal voltage | greater than 0—less than 0.2 volts | p. 112 |
| PTO clutch air gap (Warner) | 0.38—0.64 mm (0.015—0.025 in.) | p. 138 |
| PTO clutch air gap (Ogura) | 0.30—0.51 mm (0.012—0.020 in.) | p. 138 |
