A lawn tractor that cranks but never fires usually traces back to the safety interlock, and testing that circuit blind eats a Saturday. Sorting it out is what the 40-page Ford LT 10, LT 12, 9800987, 9800988 operator manual PDF, factory publication 709042, was printed for. Wiring diagrams for the 10 H.P. and 12 H.P. units follow every wire through the interlock switches, ignition switch, and charging system, so you can test a circuit instead of swapping parts on a hunch. Belt routing diagrams, brake and steering adjustments, and the daily, 25 hour, and 100 hour lubrication schedules fill the middle of the book. Gap the spark plug to .030 in. (.76 mm) and refill the crankcase with 3 pints (1.4 liters) at every change. Guess at belt routing and you buy the belt twice. Print the pages you need, let them get greasy on the bench, and keep the bookmarked, text searchable file clean for next season.
What's Inside This Operator Manual
| System | Pages | Key Topics |
|---|
| Safety Precautions | 4-5 | The Tractor |
| Controls and Operation | 6-8 | Safety Interlock System, Brake Clutch Pedal, Gear Shift Lever, Attachment Lift Lever, P.T.O. Lever, Engine Speed Control, Parking Brake Latch, Headlight Switch |
| Trial Run | 9 | |
| Maintenance and Lubrication | 10-11 | Break-In Maintenance and Lubrication, Daily Schedule, 25 Hour Schedule, 100 Hour Schedule |
| Adjustment and Servicing | 12-15 | Traction Belt, Belt Diagram, Brake Clutch Pedal/Parking Brake, Brake Pad, Steering Gear |
| Electrical System | 16 | Battery-Electrolyte Level, Cleaning the Battery, Battery-Jump Starting, Fuse, Safety Interlock System |
| Storage | 17 | |
| Trouble Shooting | 18 | Brake Clutch Pedal, Ignition Switch, Carburetor, Battery, Charging System |
| Wiring Diagram | 19-20 | H.P. Units |
| Set-Up and Assembly | 21-25 | Hardware Bag Contents, Battery, Steering Wheel, Seat, Initial Servicing |
| Replacement Decals | 26-27 | Safety, Standard |
| Optional Accessories | 28 | Grass Catcher, Dump Carts, Lawn Sweepers, Front Blade, Snow Thrower, All Weather Cab |
| Engine Information | 29-38 | Engine Model Series, Bore, Stroke, Displacement, Horsepower, Torque |
| Owner Assistance | 39-40 | Dealership, Branch Office, Consumer Services Department, Machine Model, Serial Number |
Quick Reference Specifications
| Specification | Value | Page |
|---|
| All Models |
| Spark Plug Gap | .030 in. (.76 mm) | p. 37 |
| Intake Valve Clearance | .005 - .007 in. (.13 - .18 mm) | p. 37 |
| Engine Oil Capacity | 3 pints (1.4 liters) | p. 31 |
| Exhaust Valve Clearance | .009 - .011 in. (.23 - .28 mm) | p. 37 |
| Cylinder Head Screw Torque | 165 inch pounds (19 Nm) | p. 34 |
| Steering Gear Cap Screw Torque | 10-15 ft./lbs. | p. 15 |
| Solenoid Torque | 40-50 in./lbs. | p. 19 |
| Model Series 280700 and 281700 |
| Engine Horsepower (Net) | 12 HP @ 3600 RPM | p. 37 |
| Engine Torque (Max) | 20.5 Max. @ 2400 RPM | p. 37 |
| Model Series 255700, 256700 |
| Engine Horsepower (Max) | 10.0 @ 3600 RPM | p. 37 |
| Engine Torque (Max) | 16.1 @ 2400 RPM | p. 37 |
